Effects of the Heterodimeric Neurotoxic Phospholipase A 2 from the Venom of Vipera nikolskii on the Contractility of Rat Papillary Muscles and Thoracic Aortas.

Autor: Averin A; Institute of Cell Biophysics, Federal Research Center 'Pushchino Scientific Center of Biological Research', Pushchino Branch, Russian Academy of Sciences, Pushchino 142290, Russia., Starkov V; Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russia., Tsetlin V; Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russia., Utkin Y; Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russia.
Jazyk: angličtina
Zdroj: Toxins [Toxins (Basel)] 2024 Feb 10; Vol. 16 (2). Date of Electronic Publication: 2024 Feb 10.
DOI: 10.3390/toxins16020100
Abstrakt: Phospholipases A 2 (PLA 2 s) are a large family of snake toxins manifesting diverse biological effects, which are not always related to phospholipolytic activity. Snake venom PLA 2 s (svPLA 2 s) are extracellular proteins with a molecular mass of 13-14 kDa. They are present in venoms in the form of monomers, dimers, and larger oligomers. The cardiovascular system is one of the multiple svPLA 2 targets in prey organisms. The results obtained previously on the cardiovascular effects of monomeric svPLA 2 s were inconsistent, while the data on the dimeric svPLA 2 crotoxin from the rattlesnake Crotalus durissus terrificus showed that it significantly reduced the contractile force of guinea pig hearts. Here, we studied the effects of the heterodimeric svPLA 2 HDP-1 from the viper Vipera nikolskii on papillary muscle (PM) contractility and the tension of the aortic rings (ARs). HDP-1 is structurally different from crotoxin, and over a wide range of concentrations, it produced a long-term, stable, positive inotropic effect in PMs, which did not turn into contractures at the concentrations studied. This also distinguishes HDP-1 from the monomeric svPLA 2 s, which at high concentrations inhibited cardiac function. HDP-1, when acting on ARs preconstricted with 10 μM phenylephrine, induced a vasorelaxant effect, similar to some other svPLA 2 s. These are the first indications of the cardiac and vascular effects of true vipers' heterodimeric svPLA 2 s.
Databáze: MEDLINE
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