Plates were then washed as above and incubated (3 hours, 25C) with 100 l of sheep anti-human IgG1/HRP (Binding Site AP006) or 100 l of sheep anti-human IgG4/HRP (Binding Site AP009) both diluted 11000 in blocking buffer. the same individuals. These observations are in line with the idea that the gSG6 salivary protein induces immune tolerance, especially after intense and prolonged exposure as is the case for the area under study, suggesting that gSG6 may trigger in exposed individuals a Th2-oriented (Rac)-VU 6008667 immune response. Introduction The ability of hematophagous insects to feed on a protein-rich source such as blood involves complex behavioral, morphological and physiological adaptations to find suitable hosts, reach blood vessels and to suck and digest blood. One of the results of these adaptations to blood feeding was the evolution of repertoires of salivary proteins playing crucial functions in counteracting the hemostatic, inflammatory and immune responses of vertebrate hosts to tissue injury [1]. These proteins, injected (Rac)-VU 6008667 into the skin during the blood meal, play essential roles in blood feeding but also trigger an anti-saliva antibody response that can be exploited as a tool to evaluate host exposure to disease vectors as diverse as ticks [2], sandflies [3], triatomines [4], tsetse flies [5], [6] and mosquitoes [7]C[11]. Transcriptome studies during the last five (Rac)-VU 6008667 to ten years PEBP2A2 allowed to unravel the complexity of the salivary repertoires of different mosquito species establishing that they carry in their saliva around 70 to 130 salivary proteins [12]C[14]. Moreover, comparative analyses identified genus-specific proteins and protein families, which are found for example in the saliva of mosquitoes but are absent in and species, or viceversa [15]. These genus-specific proteins, if immunogenic, may represent ideal candidates for the development of sensitive, reliable and reproducible serological tools for the evaluation of human (Rac)-VU 6008667 exposure to vectors of important human diseases such as malaria or dengue. Evaluation of malaria transmission and disease risk requires both parasitological and entomological measurements, with the latter classically based on the Entomological Inoculation Rate (EIR) that is the number of infectious bites per person per unit of time. However, determination of EIR can be difficult or impossible in several epidemiological settings (low malaria transmission, low or reduced vector density, logistic problems, etc.) as well as in children (where assessment of exposure by human landing catches is ethically unfeasible). Thus, alternative tools would be extremely valuable. In this respect the gSG6 salivary protein appears a very promising tool for the evaluation of human exposure to malaria vectors. gSG6 is a small anopheline-specific protein which is exclusively expressed in adult female salivary glands, it is relatively abundant in saliva and plays a role in blood feeding [16], [17]. Previous studies on populations from Burkina Faso [18], Tanzania [19] and Uganda [20] showed that human IgG response to the gSG6 protein is sufficiently short lived to detect variation in exposure to malaria vectors both in time and in space. Moreover, the anti-gSG6 IgG response to the protein also reflects exposure to and and, therefore, it may be considered as a reliable indicator of human exposure to all three main Afrotropical malaria vectors [21]. Using the gSG6-P1 peptide, which is designed on the gSG6 protein, similar results were obtained by Remoue and collaborators [22], [23], who also showed it may be a valuable tool to evaluate the efficacy of malaria vector control interventions, such as the application of Insecticide Treated Nets [24], [25]. Considering that SG6.
