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2020 | 74 | 40-45
Article title

Bombesin-like peptides are able to affect central histamine-induced resuscitating effect in haemorrhage-shocked rats

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PL
Peptydy bombezynopodobne mogą wpływać na efekt resuscytacyjny ośrodkowo działającej histaminy we wstrząsie krwotocznym u szczurów
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EN
INTRODUCTION: Activation of the central histaminergic system induces a resuscitating effect in haemorrhage-shocked rats. Since peripherally administered bombesin evokes a similar action, and bombesin receptors are present in the central nervous system regions responsible for cardiovascular regulation, the aim of the study was to examine the effects of bombesin receptor blockage on histamine-induced cardiovascular effects in haemorrhagic shock. MATERIAL AND METHODS: Studies were carried out in male Wistar rats anaesthetized with ketamine/xylazine (100 mg/kg + 10 mg/kg, intraperitoneally) and then subjected to reversible haemorrhagic shock with a mean arterial pressure (MAP) of 30–35 mmHg. Immediately after terminating bleeding, the animals were pre-treated intracerebroventricularly (icv) with bombesin receptor antagonists/0.9% NaCl solution, and 5 min later – treated via the same route with histamine (50 nmol) or 0.9% NaCl solution. RESULTS: Haemorrhage led to decreases in the pulse pressure (PP), heart rate (HR) and mesenteric blood flow (MBF). Histamine induced a pressor effect, with a significant increase in PP and MBF. The effect was inhibited by both [D-Phe12,Leu14]-bombesin and BIM 23042, non-selective and selective bombesin 1 (BB1) receptor antagonists, respectively. In the control groups the antagonists had no effect. CONCLUSIONS: Endogenous bombesin-like peptides, acting via BB1 receptors, are able to affect a histamine-induced pressor effect in haemorrhage-shocked rats.
PL
WSTĘP: Pobudzenie ośrodkowego układu histaminergicznego wywołuje działanie resuscytacyjne u szczurów we wstrząsie krwotocznym. Skoro podawana dożylnie bombezyna wykazuje podobne działanie, a receptory bombezynowe są obecne w strukturach ośrodkowego układu nerwowego, odpowiedzialnych za regulację czynności układu krążenia, celem pracy było zbadanie wpływu zablokowania receptorów bombezynowych na efekty krążeniowe wynikające z podania do komory bocznej mózgu (icv) histaminy we wstrząsie krwotocznym u szczurów. MATERIAŁ I METODY: Badania przeprowadzono u szczurów, samców szczepu Wistar w znieczuleniu ogólnym (ketamina 100 mg/kg + ksylazyna 10 mg/kg, dootrzewnowo). Zastosowano model odwracalnego wstrząsu krwotocznego ze średnim ciśnieniem tętniczym (MAP) 30–35 mmHg. Niezwłocznie po zakończeniu krwawienia podawano icv antagonistów receptorów bombezynowych/0,9% roztwór NaCl, a 5 min później tą samą drogą histaminę (50 nmol) bądź 0,9% roztwór NaCl. WYNIKI: Utrata krwi prowadziła do obniżenia ciśnienia tętna (PP), częstości rytmu serca (HR) i przepływu krezkowego krwi (MBF). Histamina wywoływała działanie presyjne ze wzrostem PP i MBF. Efekty działania histaminy były częściowo hamowane przez [D-Phe12,Leu14]-bombezynę i BIM 23042, odpowiednio nieselektywnego antagonistę receptorów bombezynowych oraz selektywnego blokera receptorów bombezynowych typu 1 (BB1). W grupach kontrolnych nie stwierdzono wpływu antagonistów receptorów bombezynowych na mierzone parametry układu krążenia. WNIOSKI: Endogenne peptydy bombezynopodobne, działając poprzez receptory BB1, mogą wpływać na wywoływane przez ośrodkowo działającą histaminę działanie resuscytacyjne we wstrząsie krwotocznym u szczurów.
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Year
Issue
74
Pages
40-45
Physical description
Contributors
  • Department of Physiology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, Katowice, Poland
  • Department of Basic Medical Sciences, Faculty of Health Sciences in Bytom, Medical University of Silesia, Katowice, Poland
  • Department of Physiology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, Katowice, Poland
author
  • Department of Physiology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, Katowice, Poland
author
  • Department of Physiology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, Katowice, Poland, jjochem@poczta.onet.pl
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bwmeta1.element.psjd-551c39be-c109-418a-95cf-90c04c7a812b
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