Single neuron activity of rat hypothalamic paraventricular nucleus during body suspension.
Single neuron activity in the hypothalamic paraventricular nucleus (PVN) was recorded during horizontal and 45 degrees head-down tilt suspension in unanesthetized rats. When the rats were raised in the head-down position, 13 of 34 neurons (38%) in the PVN changed activity as follows: gradual decrease (11/13, type I), or gradual increase (2/13, type II). Responses of 6 type I and 1 type II neuron were smaller during horizontal suspension. Intracerebroventricular or intraperitoneal injection of hypertonic saline caused an increase in activity of 4 of 5 type I neurons tested. This hyperosmotic stimulation had no effect during suppressed activity induced by head-down tilt. These results suggest that the activity of PVN neurons is altered during body suspension, probably by information from baroreceptors in the thoracic activity, proprioreceptors and/or the vestibular organ, and these neurons might be involved in regulation of the autonomic and neuroendocrine systems.
D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D008297:Male; D010286:Paraventricular Hypothalamic Nucleus / Q000187:drug effects / Q000502:physiology*; D051381:Rats; D011919:Rats, Inbred Strains; D012462:Saline Solution, Hypertonic / Q000494:pharmacology; D014893:Weightlessness
D012462:Saline Solution, Hypertonic