Implication of haematophagous arthropod salivary proteins in host-vector interactions
© Fontaine et al; licensee BioMed Central Ltd. 2011
Received: 8 April 2011
Accepted: 28 September 2011
Published: 28 September 2011
The saliva of haematophagous arthropods contains an array of anti-haemostatic, anti-inflammatory and immunomodulatory molecules that contribute to the success of the blood meal. The saliva of haematophagous arthropods is also involved in the transmission and the establishment of pathogens in the host and in allergic responses. This survey provides a comprehensive overview of the pharmacological activity and immunogenic properties of the main salivary proteins characterised in various haematophagous arthropod species. The potential biological and epidemiological applications of these immunogenic salivary molecules will be discussed with an emphasis on their use as biomarkers of exposure to haematophagous arthropod bites or vaccine candidates that are liable to improve host protection against vector-borne diseases.
During the course of evolution, haematophagy has arisen many times in disparate arthropod taxa. Between the taxa, this feeding habit has evolved independently over several million years [1, 2] leading to morphophysiological differences among haematophagous arthropods. At the molecular level, this is reflected by the existence of a variety of pharmacologically active molecules in arthropod saliva used to face the constraints of vertebrate host haemostasis, inflammation and adaptive immunity [3–5].
Taxonomic classification of major vector-borne diseases
West Nile disease
Human African Trypanosomiasis
Tick borne encephalitis
Arthropod-borne diseases are a major health problem worldwide. They cause serious impacts on the economy and survival of human populations living mainly in tropical and sub-tropical countries [12–14]. To a lesser extent, human populations in developed countries are also exposed to a variety of vector-borne pathogens [15–17]. Pathogen vaccine and prophylactic drug research have so far produced little to protect individuals from many arthropod-borne diseases. Currently, vaccines are only available for the yellow fever virus , the Japanese encephalitis virus , the Rift valley fever virus  and the tick-borne encephalitis virus . Protection against Plasmodium, the malaria parasites, still relies on the use of prophylactic drugs and is hampered by the escalation of drug-resistance .
Thus, the primary mechanism to protect individuals from vector-borne diseases is the prevention of bites from infected arthropods. This can be achieved by a combination of personal protective measures and vector control strategies adapted to vector behaviour [23–26]. These methods have been historically successful in reducing [27–29] or eliminating [30, 31] the transmission of some vector-borne diseases. Currently, the effectiveness of anti-vectorial measures and the evaluation of the transmission of arthropod-borne diseases are determined by laboratory bioassay tests [32–35], by measuring the incidence, morbidity or mortality of vector-borne diseases in controlled clinical trials in the field [36, 37] or by entomological methods [38, 39]. Concerning mosquito-borne diseases, the entomological reference method to measure vector density is by catching landing mosquitoes on humans, which provides a good estimate of the average number of bites per person per day received from one particular vector species . However, in terms of execution and supervision, this method is very laborious and dependent on the skills of the collector. In addition, the deliberate exposure of human volunteers to vectors has raised some ethical issues against this technique. As the human bite rate was shown to vary within small geographic areas [41, 42], the results of local catches cannot be extrapolated to larger areas. Additionally, results from the human landing catch performed by adults can be difficult to extrapolate to children. Alternative entomological methods exist to capture medically important haematophagous arthropods, such as carbon dioxide dry ice traps, light traps and odour baited traps (to collect flying dipterans)  or the drag-flag method (to collect ticks) . However, these tools do not differentiate anthropophilic from zoophilic arthropods and cannot precisely assess the contact between haematophagous arthropods and host. Hence, the development of new indicators and methods to evaluate the effectiveness of anti-vectorial strategies at the individual level is necessary.
A common feature shared among arthropod vectors is their habit of feeding on blood involving the injection of saliva into the host's skin. One consequence of the injection of salivary proteins is the eliciting of host antibody responses against these pharmacologically active components [45–51]. Such observations suggest that these antigenic components could potentially be used as immunological tools to evaluate individual exposure to arthropod bites.
This present survey is particularly concerned with the current knowledge of antibody responses to the salivary proteins of haematophagous arthropods. Immunogenic salivary proteins of haematophagous arthropods were first studied for their allergenic properties. However, there is strong evidence for their application in improving host protection against some vector-borne diseases and for their use as alternative immunological tools to assess individual exposure to haematophagous arthropod bites. An overview of the pharmacological activity of the main salivary proteins characterised in various haematophagous arthropod species will first be presented to provide a better understanding of the role of saliva in host defence, including haemostasis and the immune response.
Blood-feeding behaviour among haematophagous arthropods
The phylum Arthropoda represents the vast majority of metazoan life forms on earth, with a species richness estimated at 5-10 million . The blood-feeding habit has arisen and evolved independently in more than 14,000 species from 400 genera and five orders in the arthropod taxonomy [1, 53]. These independent adoptions of haematophagy during the evolution of arthropod vectors required morphological, behavioural and biochemical adaptations in order to remove blood from the skin of vertebrate hosts. Indeed, blood is not an easy access nutrient due to its cryptic nature in addition to the host's behavioural and biological defensive response.
Mouthparts have adapted the following two strategies to obtain blood from vertebrates: (i) lacerating dermal capillaries and collecting the nutritive fluid in a hemorrhagic pool (pool feeding or telmophagy, e.g., flies from the families Tabanidae and Psychodidae and Ixodoidae (ticks) and (ii) by directly inserting mouthparts into a capillary (capillary feeding or solenophagy, e.g., Culicidae (mosquitoes) and Reduviidae (bugs). The development of these blood-feeding habits may have occurred in several different ways. A prolonged and close association between terrestrial hosts and arthropods that regularly fed on dead parts of the host's body or organic debris associated with the nests or burrows may have gradually established more profound parasitic relations characterised by switching to a haematophagous diet. Alternatively, the development of haematophagy would have been facilitated in some capillary feeders by morphological preadaptation of their ancestors to phytophagy or entomophagy [2, 54–56].
Other important blood-feeding behaviours are displayed among haematophagous arthropods, including the duration of blood-feeding (which can range from few minutes for Culicidae  to several days for ticks ), the rate of anthropophily  or the obligate versus facultative haematophagous diet . These singularities among different haematophagous arthropods, adding to other behavioural or biological features, such as the length of the extrinsic incubation period (time between the acquisition of an infectious agent by a vector and its ability to transmit it to other vertebrate hosts) , the nycthemeral activity  or the reproductive strategies (K- and r- selected arthropods) , are additional features that may have significant implications on disease transmission and on the implementation of anti-vectorial strategies. However, whichever blood-feeding strategies or feeding behaviour is used, each adoption of haematophagy requires solutions to counteract vertebrate host haemostatic, inflammatory and immune responses. At the molecular level, haematophagous arthropods have also developed, by an evolutionary process, an important diversity of pharmacological compounds in their saliva in order to prevent these physiological responses.
The role of saliva in blood-feeding
Salivary components and host's haemostasis
Haemostasis is a host cellular and molecular response that prevents blood loss from a damaged vessel through several redundant processes, such as blood vessel vasoconstriction, formation of a primary platelet plug (primary haemostasis) or vessel strengthening by blood coagulation (secondary haemostasis) [For review: [63, 64]].
Damage to blood vessel endothelium first results in vasoconstriction that decreases blood flow at the bite site to limit the haemorrhage. Two strategies are employed by haematophagous arthropods to prevent this phenomenon. Some arthropods display salivary components which block host vasoconstrictor agents, such as peroxidase from the Anopheles albimanus mosquitoes . Other arthropods have strong vasodilators in their saliva. For example, Lutzomyia longipalpis sand flies and Simulium vittatum black flies express maxadilan and Simulium vittatum erythema protein (SVEP) in their saliva, respectively, which are the most potent known vasodilators [66, 67]. These two species are pool feeders that require strong vasodilatory substances to increase blood flow perfusion in superficial regions of the skin. Closely related species can use separate mechanisms to counteract vascular compression as illustrated by Phlebotomus sand flies that express adenosine and 5'AMP vasodilators instead of maxadilan in their saliva .
This platelet activation prepares the implementation of secondary haemostasis by exposing the surface of activated platelets to coagulation proteins. Through a series of reactions involving several blood coagulation factors, the coagulation pathway (including the contact activation pathway and tissue factor pathway) is propagated until the formation of thrombin. The latter converts circulating soluble fibrinogen into insoluble fibrin, leading to blood clotting and complete cessation of haemorrhage [81–83]. As a result of convergent evolution, a variety of unrelated arthropod species have developed salivary inhibitors toward thrombin, a prime target to overcome both primary and secondary haemostasis (Additional file 1 Figure 1). As observed for primary haemostasis, more than one anticoagulant compound can be found in the saliva of a single haematophagous arthropod, as exemplified by hamadarin and anophensin, which are two anticoagulants targeting the contact activation pathway isolated in An.stephensi[84, 85]. This redundancy of function reinforces the efficiency of the anti-haemostatic response.
Salivary components and host's immunity
Adding to haemostatic defences, vertebrate hosts have evolved systems of immune defences to eliminate foreign organisms in the body, which can largely impair haematophagous arthropod blood-feeding. Tissue injury causes the immediate onset of acute inflammation and innate immunity, which promote tissue repair, prevent colonisation of the damaged tissues by opportunistic pathogens and initiates adaptive immunity, which is more specific.
Tissue damage and inflammation can lead to the extracellular production of adenosine from ATP degradation. Adenosine can have analgesic or pronociceptive effects depending on the activation of different peripheral receptors . Pain perception can induce defensive behaviours from the host that could be deleterious to haematophagous arthropods. As a consequence, adenosine deaminase enzymes detected in saliva of various arthropods [100–102] were proposed to suppress pain perception by degrading adenosine at the bite site .
The innate immune system can also influence the type of adaptive immune response that develops. Haematophagous arthropod saliva can greatly impair the development of an appropriate adaptive immune response by the host by altering the function of antigen presenting cells (APC), such as macrophages  or dendritic cells (DC) [95, 104, 105]. These cells are involved in the capture and processing of salivary or pathogen antigens at the bite site, as well as in antigen presentation to T lymphocytes in the draining lymph nodes , which promotes cell and antibody mediated responses [107, 108]. As a generalized pattern, salivary gland extracts from several haematophagous arthropods can inhibit Th1 cytokines secretion, such as IFN-γ and IL-2 [109–112], promoting the development of an antibody-mediated Th2 response [113–117]. This polarisation of host immunity toward a Th2 response (to the detriment of a Th1 cell-mediated response) is beneficial to the success of the blood feeding but it may also have a beneficial impact on pathogen transmission.
Salivary components and enhancement of vector-borne pathogens infection
The discovery of the immuno-modulatory property of saliva has stimulated several research groups to study the involvement of salivary proteins from diverse vectors in the transmission and the establishment of corresponding pathogens into their hosts.
Titus and Ribeiro were the first to describe the enhancing effect of sand fly salivary gland extracts on cutaneous leishmaniasis when coinoculated with Leishmania promastigotes. Mice injected with Leishmania parasites concomitantly with a small amount of salivary gland proteins developed larger lesions and harboured more parasites than controls . The enhancing effect of salivary extracts was confirmed with other Leishmania and sand fly species [119, 120]. Subsequent studies have demonstrated that the injection of Triatominae bug saliva into the skin of mice in the presence of Trypanosoma cruzi parasites induced an up to six-fold blood parasitaemia , and that the saliva of ixodid ticks potentiated the transmission of Thogoto virus . Interestingly, enhancement of Thogoto virus infection was only observed with salivary gland extracts derived from metastriate ixodid ticks but not from prostriate ixodid ticks, argasid ticks or mosquito saliva . These results highlight the strong specificity of the vector/pathogen interaction that is needed in order to potentiate this enhancing transmission effect and suggest that this effect may involve a limited number of specific proteins to the haematophagous arthropod species or genus.
Effectively, in Lutzomyia longipalpis sand fly, the vasodilator maxadilan appears as the principal salivary molecule responsible for this enhanced parasite transmission as it exacerbates infection with Leishmania major to the same degree as whole saliva . For Borrelia burgdorferi, the spirochetal agent of Lyme disease, the Salp15 protein expressed in Ixodes scapularis tick saliva enhances its transmission and survival within the vertebrate host. The spirochaete pathogen specifically up-regulates the expression of Salp15 and associates with it in order to be protected from borreliacidal effects induced by antibody-mediated killing . The enhanced infection induced by saliva seems to be a widespread phenomenon in various vector species and for various viruses, bacterial or parasite pathogens [121, 122, 125, 126]. Mosquito saliva might also accelerate and amplify infections of West Nile virus [127, 128], La Crosse virus  or Cache-valley virus . All these data suggest that haematophagous arthropod vectors are not simply "flying or crawling" syringes but rather play a dynamic role in the host/vector/pathogen relationship. The participation of saliva components in this transmission is supported by the increase infectivity observed when pathogens are delivered to the host by haematophagous arthropod bites compared to delivery by a syringe without saliva proteins [129, 131–133].
All salivary proteins characterized in various hematophagous arthropods so far give a global overview of their complexity as well as their diversity both at their molecular level as well as their targets. It is interesting to note that only a minority of these salivary proteins has been assigned a precise function. For instance, concerning any tick species with a known genome or salivary gland transcriptome, less than 5% of the salivary proteins have their function verified . Further knowledge on the pharmacology of arthropod salivary proteins might thus lead to the discovery of novel vasodilator, anti-platelet, anti-clotting, analgesic or immunomodulatory compounds, used by hematophagous arthropods to counteract host defenses. In addition, these salivary molecules might also provide new immunological tools to combat the direct and indirect nuisance caused by these hematophagous arthopods.
Salivary proteins and host antibody response: immunological tools in sight?
Saliva of haematophagous arthropods and allergy
Since the mid-1930s, numerous studies have described host immediate-type hypersensitivity (ITH) reactions in response to the bite of various haematophagous arthropod families, such as Psychodidae , Culicidae [135–137] or Glossinidae . This ITH skin reaction, also known as type I hypersensitivity, is now widely accepted to be an allergic reaction which involves the production of IgE antibodies in response to specific salivary allergens . Several studies have attempted to characterise the allergens involved in ITH by using different techniques (e.g., skin testing, RAST, ELISA, Immunoblot) and different allergen preparations with the aim of developing tools for diagnosis and treatment of allergic reactions [139, 140]. The comparison of the allergenic potency of whole body, thoracic and abdominal hemolymph and salivary glands from Triatoma protracta (reduviid bug) by RAST inhibition demonstrated that the allergens were concentrated in the salivary glands . Similar results were observed for the Ixodes holocyclus tick . Recently, Wongkamchai and colleagues have gained further evidence that major allergens are more abundant in saliva, followed by salivary gland extracts and whole body extracts from four mosquito species . These different studies confirmed that the more concentrated source of allergens is located in saliva and salivary glands from haematophagous arthropods. Thus, saliva appears to be the prime antigenic source for testing or treating haematophagous arthropod-induced allergic reactions .
Recombinant salivary proteins characterized in hematophagous arthropods and their immunological applications
Belong to the D7 family
30 kDa salivary gland allergen
Belong to the lipocalin family
Arg r 1
Belong to the lipocalin family
Dermatophagoides pteronyssinus allergen- like
Glosina m. morsitans
Tsetse Antigen 5
Immunological marker of exposure
Immunological marker of exposure
Immunological marker of exposure
Immunological marker of exposure
Currently, whole body extracts from mosquitoes are used in the diagnosis and immunotherapy of mosquito bite allergies [153, 154]. However, these commercially available samples contain many extraneous proteins that are not present in mosquito saliva and might interfere with diagnostics or may even cause additional sensitisation in subjects with a history of allergic reactions to mosquito bites. Moreover, the treatment of mosquito allergies is not widely used because considerable variations in the biological activity of these mosquito whole body allergen extracts have been described . Thus, synthetic allergens appear to be a promising alternative for the diagnosis of allergic individuals, but also may improve desensitisation protocols and overcome the lack of standardisations in allergen immunotherapy [7, 142].
Saliva of haematophagous arthropods and vaccines
Over the course of the past 20 years, it has been observed that a history of exposure to uninfected bites has the ability to protect against several vector-borne infections, including tularaemia  and Lyme borreliosis  in animals pre-exposed to tick bites. The hypothesis that salivary components could be effective vaccine candidates for reducing the morbidity of vector-borne diseases in exposed individuals was strengthened by the discovery that pre-exposure of mice to salivary gland extracts of Phlebotomus papatasii abrogates the size of dermal lesions and reduces Leishmania major parasite loads in tissue . More recently, it was shown that pre-exposing mice to Anopheles stephensi bites could protect them from rodent malaria , but these results are controversial .
These protective effects might be partly due to the development of host immunity against vector salivary proteins described as enhancing pathogen establishment. Based on these reflections, Morris and colleagues have tested the potential of Lutzomia longipalpis maxadilan as a vaccine candidate to protect mice against Leishmania infection (Table 2) . Mice vaccinated with synthetic maxadilan were highly resistant to infection, as evidenced by smaller cutaneous lesions and a shorter healing period compared to controls. As maxadilan is only expressed in New World Psychodidae from the genus Lutzomia, it cannot confer protection against Leishmania infection transmitted by Old World sand flies from the genus Phlebotomus. However, vaccination with SP15, a 15 kD salivary protein from the Old World P. papatasi sand fly, protected mice from Leishmania infection [161, 162]. These results highlight the challenge in developing a universal vaccine to control a specific pathogen transmitted by several vector species. Indeed, the variability in the salivary repertoire of closely related vector species implies that one must develop a salivary vaccine candidate for each different vector transmitting a specific pathogen. Additionally, one must take into account the geographical distribution of these vectors to determine the appropriate candidates that should be used during vaccination campains.
The efficacy of the Salp15 salivary protein as a vaccine candidate, the other well described salivary molecule isolated in I. scapularis ticks with an enhancing effect on pathogen transmission, was also tested in vivo. Mice immunised with recombinant Salp15 proteins were partially protected against Lyme borreliosis spirochetes transmitted by I. scapularis ticks . Interestingly, the co-immunisation with Salp15 and OspA (a Borrelia burgdorferi outer-surface protein ) exerts a better protection against B. burgdorferi than either of these two candidates when used alone. Thus, the conjunction of salivary proteins to traditional pathogen-based vaccine could improve host protection against vector-borne disease infection. To our knowledge, no vaccine candidates have been developed against salivary components from other haematophagous arthropods. This relatively new vaccine approach (i.e., targeting arthropod salivary components required by a pathogen for its establishment in the host) necessitates the characterisation of salivary components exhibiting an enhancing effect on pathogen infection. The development of multi-epitope vaccines by the combination of pathogen-derived antigens with appropriate salivary antigens from their corresponding vectors could provide a better protection against vector-borne diseases than pathogen-derived vaccine candidates alone. Recently, An. stephensi saliva was reported to enhance the progression of cerebral malaria in a murine model . The further characterisation of salivary components involved in this effect might lead to potential vaccine candidates, which could be used in combination with other malaria vaccine candidates to protect against severe malaria [166, 167].
Other vaccine strategies using salivary proteins were undertaken in order to reduce host/vector contact by avoiding blood intake or diminishing the duration of the blood meal, particularly in ticks [168–170]. Additionally, vaccine candidates targeting gut or body haematophagous arthropod antigens were also developed to either disrupt the biology of the vectors or to block pathogen transmission. These approaches are promising to control vector-borne diseases but are beyond the scope of this review; supplementary details can be found in other works [171–175].
Saliva of haematophagous arthropods and exposure markers
Relationship between anti-saliva IgG responses and haematophagous arthropod exposure
The absence of an antibody response against saliva from mosquitoes or Culicoides midges in the sera of children  or horses  living in Iceland (a country exempt from these two biting arthropods) and the appearance of an IgG antibody responses in animals or humans following exposure to haematophagous arthropod bites [144, 177–179] are strong arguments suggesting that the acquisition of an antibody response against haematophagous arthropod saliva is exposure dependent.
The correlation between arthropod exposure and the level of anti-saliva IgG antibody was first evidenced using the sera from outdoor workers (in New Jersey, U.S.A.) who had been exposed to Ixodes damini ticks during their forestry activities . Moreover, a significant decrease of the IgG anti-tick saliva levels was observed in the absence of tick exposure for several months (from October to January) . From this point, several serological analyses demonstrated a relation between the density of diverse haematophagous arthropods and the level of antibody responses against their saliva. A kinetic analysis of the serological response against Aedes communis saliva from individuals living in Finnish Lapland indicated that seasonal exposure to mosquito bites elicited more intense antibody responses toward salivary antigens . In a larger cohort, using sera from 1,059 Canadian blood donors sampled before and after the summer mosquito exposure peak, Peng and colleagues showed significant higher level of IgG antibody against Aedes vexans saliva after the summer peak exposure . Higher levels of anti-saliva IgG antibodies were also detected in individuals exposed to Glossina bites compared to non-exposed individuals . These works demonstrated that levels of serological immune responses could be influenced by seasonal variations of the level of haematophagous arthropod densities.
Additionally, Orlandi-Pradines and colleagues have evaluated the consequences of a transient exposure to An. gambiae and Ae. aegypti mosquitoes in French travellers during a five-month journey to tropical Africa on anti-saliva IgG responses . This study reported that several travellers from areas free of An. gambiae and Ae. aegypti mosquitoes developed an antibody response against saliva from these two unrelated mosquitoes. Thus, transient exposure (e.g., seasons or travel into endemic areas) to haematophagous arthropod bites seems sufficient for developing an IgG response against arthropod saliva. Additionally, IgM antibodies directed against Triatoma infestans saliva can be detectable as early as one day after a single encounter with several triatomine bugs and decrease even more rapidly (18 days) than IgG in chickens . These IgM responses seem highly sensitive to the detection of bug exposures; however, no association was observed between level of exposure and IgM antibody levels. These results highlight the potential use of the short persistence of IgM responses (as a complement to measuring IgG responses) as an indicator of recent exposure to haematophagous arthropods. The observed link between anti-saliva antibody responses and haematophagous arthropod exposure, as well as the waning of these antibody responses after a period of non-exposure, favour the potential use of immunogenic saliva as an immunological marker of exposure. Indeed, simple blood sampling would give an indication of individual exposure to the bites of specific vectors and could be used to complete entomological surveys or to replace them when human landing catch or other trapping methods are difficult to implement . Saliva-based immunological markers of exposures would also be more appropriate than measuring vector-borne disease incidence in clinical trials to assess the effectiveness of anti-vectorial devices in areas with low pathogen transmission intensity . Finally, it could be an alternative strategy compared to entomological methods (i.e., human landing catch) to assess vector bite exposure particularly in children .
In a recent clinical assay, Drame and colleagues confirmed the validity of using An. gambiae crude saliva as an immunological marker to assess the efficaccy of insecticide-treated nets (ITNs) in a malaria hypo-endemic transmission area . They measured anti-saliva IgG levels, blood parasitaemia and vector densities before and after the introduction of ITNs. A significant decrease in the anti-saliva IgG response was observed after the introduction of ITNs. This diminution of antibody response was associated with a drop in parasite load but not with vector densities as measured by light traps, a standard but highly biased and imprecise entomological methods. Recently, antibody responses from sentinel guinea pigs to salivary proteins of T. infestans, the vector of T. cruzi, was shown to be a powerful tool for the evaluation of vector control interventions against Chagas disease . These studies demonstrated that anti-saliva antibody responses could be efficient tools to assess the effectiveness of antivectorial strategies implemented to control diverse vector borne diseases by giving an estimation of the real intensity of haematophagous arthropod bites at the individual level. Thus, variations of the IgG antibody level appeared to be correlated with haematophagous arthropod density, which was dependent on several factors, such as seasons, ecological environments, individual activities or the level of anti-vectorial protection.
Diversity and specificity of salivary components
As some areas can exhibit a high biodiversity in terms of haematophagous arthropod species [189, 190], a high level of specificity is necessary to assess individual exposure by immunological tests based on haematophagous arthropod saliva. Several studies have reported diverse degrees of cross-reactivity between different vector species, ranging from low [191, 192] to high species-specificity [150, 193–195]. The presence of cross-reactivity was often described in related species [191, 192], suggesting that this phenomenon can occur in closely related saliva components.
Interestingly, studies on haematophagous arthropod saliva generally use inbred laboratory strains. However, for one species, there exist distinct colonies coming from arthropods collected in the field that differed in their origins and laboratory colonisation histories. In order to evaluate sialome divergence, which could occur following the rearing of haematophagous arthropods over several decades (e.g., mosquitoes), under laboratory conditions, the sialomes (i.e., saliva and salivary gland) of three mosquito colonies (i.e., Ae. aegypti colonies Rockefeller, PAEA and Formosus) were compared using 1D SDS-PAGE [143, 210]. At the saliva and salivary gland level, no major differences were detected between these three colonies, suggesting that the expression of salivary proteins is highly conserved across populations. But these data could not exclude the possibility that a long history of laboratory rearing might have induced a homogenisation of salivary protein repertoires, which may differ from their field counterparts. This loss of salivary protein diversity as a result of long-term colonization was hypothetised to be responsible of the observed positive effects on the outcome of Leishmania infection on mice pre-immunized with sand fly saliva . Indeed, pre-immunization of mice with saliva from long-term colonized phlebotomine sand flies, was reported to induce a better protection against Leishmania infection than saliva from wild-caught or recently colonised sand flies [211, 212]. This preserved repertoire of salivary proteins at the species level is essential to develop anti-saliva based immunological tools to assess individual exposure to different haematophagous arthropod colonies settled in various areas throughout the world. The access of salivary samples from wild-caught arthropods using convenient procedures adapted to field works would allow to assess the sialome diversity between laboratory reared and wild arthropods .
Synthetic salivary components as immunological markers of exposure
Major limits for developing a biological test of exposure to haematophagous arthropod bites are the difficulty of collecting saliva or salivary gland extracts and the lack of standardisation in sampling. Effectively, the salivary protein content of haematophagous arthropods can vary according to their sex, age or diets [214–216]. Thus, a gain of sensitivity, specificity and reproducibility could be obtained by identifying the genus or species-specific immunogenic salivary proteins and to produce them in recombinant form or synthetic peptides.
The recombinant Anopheles gambiae salivary gland protein 6 (gSG6), a small salivary protein highly preserved in the Anopheles genus , was evaluated as an immunological marker of exposure . The recombinant protein was detected by IgG antibodies from children exposed to the bite of An. gambiae. BLAST analysis (NCBInr, NIH, Bethesda, Nov 15th, 2010) revealed that homologous proteins of gSG6 protein can only be found in 8 Anopheles species so far, suggesting its specificity to the Anopheles genus (Figure 3). This protein has recently been proposed as a serological candidate marker of exposure to Afrotropical malaria vectors [219, 220]. Human hosts exposed to Amblyomma americanum and Dermacentor variabilis ticks also develop a specific IgG response against a recombinant calreticulin (rTC) protein isolated from the salivary glands of the A. americanum tick . The use of recombinant salivary proteins, which are highly preserved between several related vector species, could be useful in assessing the risk of disease transmission in individuals living in areas where vector diversities are not well characterised at the species level. Interestingly, anti-rTC antibody seropositivity has higher specificity but lower sensitivity than antibodies directed against whole saliva in detecting individuals that have been exposed to ticks . The use of a single recombinant salivary protein to assess individual exposure to tick bites may explain this lack of sensitivity. Indeed, the use of two recombinant proteins (named LJM17 and LJM11) was reported to be more effective and sensitive than whole saliva to estimate the level of exposure to Lutzomia longipalpis sand flies, vectors of Leishmania parasites [223, 224].
Recombinant proteins that have been primarily produced for their biological properties or their role in allergic responses (Table 2) could also be considered potential markers of exposure candidates [225–229]. Some of these proteins appear to be relatively specific to the vector family or genus (Figure 3) and might be promising epidemiological markers of vector exposure. Ribeiro and colleagues classified conserved salivary proteins at different taxonomic levels in the suborder Nematocera from which some other specific antigenic candidates might emerge .
The detection and selection of highly specific peptides inside the whole salivary protein sequence could further increase the specificity of such immunological markers and reduce production costs. In order to optimise the specificity of the gSG6 biomarker, Poinsignon and colleagues have designed a gSG6-based peptide sequence (gSG6-P1) according to its predicted immunogenic properties . A positive association between the anti-gSG6-P1 IgG responses and the level of exposure was observed in individuals exposed to An. gambiae bites. This peptide was also detected in individuals exposed to a very low number of the malaria vector bites, suggesting its potential to reveal An. gambiae exposure in a context where classical entomological methods would be employed with difficulty (i.e., urban areas, altitude, travellers) .
Taken together, all these data support the use of immunogenic salivary components as new tools for identifying individuals at risk to vector-borne diseases and for monitoring haematophagous arthropod populations and anti-vector intervention strategies. A gain of sensitivity and specificity could be achieved by the selection and production of recombinant antigens or peptides that do not share sequence homology with other haematophagous arthropod species. Such synthetic products increase the amount of available protein for large cohort studies using high-throughput methods such as Luminex technology. These multiplex assays are cost and time effective and have proven to be useful strategies for the detection of serum antibodies directed against infectious pathogens [231, 232] and for evaluating individual exposure to vector borne diseases .
In order to facilitate their blood meals, haematophagous arthropods have elaborated a wide range of salivary components that have essential roles in counteracting host haemostatic defences. In addition to these pharmacological activities, salivary components can modulate host immunity at the bite site and induce an immune environment favourable for pathogen transmission. This immuno-modulation is associated with the production of specific antibody responses. Since the 1980s, several studies have investigated the antibody responses of vertebrate hosts against salivary proteins in an initial attempt to treat uncomfortable allergic reactions to haematophagous arthropod bites. The immunogenic properties of some salivary proteins can be used as vaccine candidates for improving host protection against some vector-borne diseases. Salivary proteins are likely to become immunological markers for relevant estimation of vector/host contacts, of the effectiveness of various control or surveillance programs, and an estimation of the pathogen transmission risk to complement methods that are currently available. A gain in sensitivity, specificity and reproducibility is expected to be obtained by the identification of species-specific immunogenic salivary peptides or the combination of several recombinant salivary proteins.
Acknowledgments and Funding
This study was supported by the French Armed Forces Medical Service and the Délégation Générale pour l'Armement (DGA, SALIVAPULS project, Grant 07ca406 and ARTHROSER project, Grant 10ca401). The post-doctoral fellowship of ID and NW was supported by the Foundation Infectiopole Sud. We thank Jean-Michel Berenger for his thoughtful comments and inputs.
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