Renal- and calcium-dependent vascular effects of Polybia paulista wasp venom

In the present study, the effects of Polybia paulista venom (PPV) on renal and vascular tissues were investigated. Isolated kidneys perfused with PPV (1 and 3 μg/mL) had increased perfusion pressure, renal vascular resistance, urinary flow, and glomerular filtration rate; and reduced sodium tubular...

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Bibliographic Details
Published in:Journal of Venomous Animals and Toxins including Tropical Diseases
Main Authors: JFC Vinhote, AFC Torres, RT Dantas, TP Praciano, RRPPB Menezes, DF Sousa, TS Brito, FJB Lima, MH Toyama, PJ Magalhães, HSA Monteiro, AMC Martins-Nunes
Format: Article in Journal/Newspaper
Language:English
Published: SciELO 2011
Subjects:
Polybia paulista
venom
kidney
aorta
MDCK
Arctic medicine. Tropical medicine
RC955-962
Toxicology. Poisons
RA1190-1270
Zoology
QL1-991
Arctic
Darby
Online Access:https://doi.org/10.1590/S1678-91992011000200011
https://doaj.org/article/ea6e0ff4dd9643c5b5abbb827131033f
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Summary:In the present study, the effects of Polybia paulista venom (PPV) on renal and vascular tissues were investigated. Isolated kidneys perfused with PPV (1 and 3 μg/mL) had increased perfusion pressure, renal vascular resistance, urinary flow, and glomerular filtration rate; and reduced sodium tubular transport. Histological evaluation demonstrated deposits of proteins in Bowman's space and tubular lumen, and focal areas of necrosis. The venom promoted a cytotoxic effect on Madin-Darby canine kidney (MDCK) cells. A significant increase in lactic dehydrogenase levels was observed in response to venom exposure. In isolated mesenteric vascular beds, pressure and vascular resistance augmented in a dose-dependent manner. PPV increased the contractility of aortic rings maintained under basal tension. This contractile response was inhibited when preparations were maintained in Ca2+-free medium. Likewise, verapamil, a voltage-gated calcium channel blocker, also inhibited the contractile response. In this study, phentolamine, a blocker of α-adrenergic receptor blocker, significantly reduced the contractile effect of PPV in the aortic ring. In conclusion, PPV produced nephrotoxicity, which suggests a direct effect on necrotic cellular death in renal tubule cells. The vascular contractile effect of PPV appears to involve calcium influx through voltage-gated calcium channels via adrenergic regulation.

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