Our study shows a down-regulation of antioxidant enzymes only in the ovaries. This result agrees with those obtained in Drosophila S2 cell line infected by Wolbachia [66] and in A. tabida – Wolbachia symbiosis [24] but not with those from the Ae. albopictus Aa23 cell line Compound C [22]. In parallel, we show an up-regulation of the thioredoxin gene that could be a response to down-regulation of other genes encoding antioxidant proteins. An alternative hypothesis is that this last gene could be induced by Wolbachia
to reduce apoptosis and accelerate multiplication of gonadic cells. Indeed, in mice, this electron donor protein reduces the process of oxidant molecules but also increases cell proliferation and the inhibition of apoptosis [67]. There was a significant over-expression of Ferritins A and C in symbiotic ovaries. Ferritins are important iron sequestration proteins and play a crucial role in the iron-withholding defence system [68]. The up-regulation of ferritin genes could be an active cellular see more reaction for starving Wolbachia of iron, CRT0066101 which would lead to bacterial growth limitation. Besides, this over-expression could be the result of the under-expression of the detoxification enzymes (Peroxiredoxin B and C and Glutathione peroxidase). As intracellular free iron produces ROS by the
Fenton reaction in presence of H2O2, iron sequestration could reduce ROS production and thus avoid deleterious effects in the cell. Regardless, this
result contrasts with that obtained in A. tabida-Wolbachia system [24, 69] where the ferritin genes were under-expressed in symbiotic condition. This down-regulation could be due to the dependence phenotype of A. tabida – Wolbachia association for the oocyte maturation, whereas our model is a facultative Wolbachia symbiosis that is not involved in host oogenesis. Autophagy was initially reported as a bulk self-degradation Resveratrol mechanism for the turnover of proteins and organelles. Autophagy can be induced via PGRP-LE, which is essential in the innate bacterial recognition in Drosophila resistance against Listeria monocytogenes [70] suggesting that this biological process is involved in the innate immune response against intracellular bacteria, viruses, and parasites [70, 71]. In our study, the atg7 and atg12 genes involved in autophagy were down-regulated in ovaries. Autophagy-associated genes were down-regulated also in A. tabida-Wolbachia and S. oryzae-SPE symbioses [24, 25], which suggests that this process is critical in bacterial symbiosis. We may hypothesize that this down-regulation was an active strategy of Wolbachia to reduce their elimination by their host. In Wolbachia-infected whole animals, three AMP genes were under-expressed (i.e., armadillidin, crustin 3, and i-type lyzozyme). Armadillidin and crustin are two Gram-positive AMPs [44, 72].
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