ABSTRACT
Chagas disease vectors can ingest several times their own volume in blood with each meal. This ad libitum feeding causes an intense process of diuresis, inducing the insect to eliminate a large quantity of urine and faeces. To ensure diuresis, the speed of circulation of the haemolymph is increased. The Triatominae circulatory system is quite simple, including the dorsal vessel, which pumps haemolymph in an anterograde direction. The return is caused by peristaltic contractions of the anterior midgut. Triatominae insects can spend several weeks without feeding, meaning that most of the time, the insect is in a resting condition. Although the mechanisms controlling the circulation of the haemolymph during post-prandial diuresis have been largely analysed, the mechanisms controlling it during resting conditions are poorly understood. In this study, we analysed several canonical pathways (i.e. L-type VGCC, GPCR, RyR, IP3R) and a novel system represented by the recently characterized Piezo proteins. Our results show that during the resting condition, haemolymph circulation depends on a cross-talk between myogenic activity, inhibitory and stimulatory cellular messengers, and Piezo proteins. This report also unveils for the first time the existence of a putative Piezo protein in Hemiptera.
Footnotes
Author contributions
Conceptualization: M.J.V.S., M.E.A., J.R.R.; Methodology: M.E.A., J.R.R., M.J.V.S.; Validation: M.J.V.S., J.R.R.; Formal analysis: M.J.V.S., J.R.R., M.E.A.; Investigation: M.J.V.; Resources: J.R.R.; Writing - original draft: J.R.R.; Writing - review & editing: M.J.V.S., M.E.A., J.R.R.; Supervision: J.R.R.; Project administration: J.R.R.; Funding acquisition: M.J.V.S., J.R.R.
Funding
This work was supported by funds provided by the Universidad Nacional de La Plata (N/948) and FONCyT (PICT: BID-PICT 2018 no. 1236). M.J.V.S. and M.E.A. are researchers at CONICET (Argentina).
Data availability
All relevant data can be found within the article and its supplementary information.