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Cardiovascular system related peptides and hypothalamic neurons
H Yamashita1, Y Ueta, K Inenaga
1Department of Physiology, University of Occupational and Environmental Health, Japan.
Neurobiology (Budapest, Hungary)
|January 1, 1995
Summary
Cardiovascular peptides and nitric oxide (NO) modulate hypothalamic neurosecretory cells. These findings reveal how the supraoptic nucleus (SON) integrates cardiovascular signals, impacting autonomic and endocrine functions.
Area of Science:
- Neuroscience
- Cardiovascular Physiology
- Endocrinology
Background:
- The hypothalamus integrates cardiovascular, endocrine, and autonomic functions.
- Previous research identified various cardiovascular peptides influencing hypothalamic neurons.
Purpose of the Study:
- To investigate the effects of cardiovascular-related peptides and nitric oxide (NO) on hypothalamic neurons, specifically in the supraoptic nucleus (SON).
Main Methods:
- Extracellular, intracellular, and whole-cell patch-clamp recordings in rat hypothalamic slice preparations.
- Application of peptides like atrial natriuretic polypeptides (ANP), B-type polypeptides (BNP), endothelin (ET), angiotensin II (AII), and interleukin-1 beta (IL-1 beta).
- Assessment of nitric oxide (NO) modulation on glutamatergic inputs.
Main Results:
- ANP modulated firing rates; BNP and ET inhibited SON neurons.
- AII inhibited transient outward potassium current; IL-1 beta increased firing rate and depolarized membrane potential.
- Nitric oxide (NO) modulated glutamatergic inputs to SON neurons.
Conclusions:
- Cardiovascular peptides (ANP, BNP, ET, AII, IL-1 beta) significantly influence the activity of SON neurosecretory cells.
- Nitric oxide (NO) also plays a role in modulating neuronal activity within the SON.
- These findings highlight the SON's role in integrating cardiovascular signals impacting neuroendocrine and autonomic regulation.