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[Change in systemic hemodynamics after acute administration of diazepam binding inhibitor (DBI) and after
Insights
The endogenous peptide DBI, linked to hypertension, increases cardiac index and arterial pressure in rats. Immunization against DBI lowered arterial pressure, suggesting a therapeutic target.
Area of Science:
- Cardiovascular Physiology
- Endocrinology
- Hypertension Research
Context:
- The HABA-ergic system's role in cardiovascular regulation is not fully understood.
- The endogenous peptide DBI (diazepam-binding inhibitor) is implicated in modulating physiological responses.
- Arterial hypertension is a significant global health concern requiring novel therapeutic targets.
Purpose:
- To investigate the acute and chronic effects of the endogenous peptide DBI on cardiovascular parameters in a rat model.
- To determine the influence of DBI on cardiac index (CI), arterial pressure (AP), and heart rate (HR).
- To assess the impact of long-term immunization against DBI on systemic hemodynamics.
Summary:
- Intravenous administration of DBI resulted in a dose-dependent increase in CI and AP, while HR remained unchanged.
- A high dose of DBI (150 mg/kg) induced a biphasic response, transitioning from a hyperkinetic to a cardiodepressive state.
- Chronic immunization against DBI led to a reduction in AP and systemic vascular resistance.
Impact:
- DBI plays a significant role in regulating cardiovascular function and arterial pressure.
- Targeting the DBI system may offer a novel therapeutic strategy for managing arterial hypertension.
- These findings contribute to understanding the complex interplay between endogenous peptides and cardiovascular homeostasis.
Abstract:
Endogenous peptide DBI inhibits the activity of HABA-ergic system and that is why can be a factor of arterial hypertension development. We investigated DBI influence on cardiac index (CI), arterial pressure (AP) and heart rate (HR) in rats. I.v. administration of DBI caused dose--dependent increase in CI, AP but HR did not change. High dose (150 mg/kg) caused a biphasic answer: hyperkinetic reaction reversed to cardiodepressive one. Long-term immunization against DBI led to decrease of AP and systemic vessel's resistance.