Interleukin-1beta immunoreactivity in identified neurons of the rat magnocellular neurosecretory system: evidence for activity-dependent release.

Abstract:

:Interleukin-1beta has been demonstrated in neurons of the rat hypothalamus, including cells of the magnocellular neurosecretory system and tuberoinfundibular system (Lechan et al., [1990] Brain Res. 514:135-140). Despite its potential importance to regulation of neuroendocrine function, however, neither the specific cell types that express interleukin-1beta or the conditions that may result in its release have yet been described. Therefore, we utilized a combination of immunocytochemical and immunoelectron microscopic localization, in conjunction with Western blot analysis, on normonatremic, hypernatremic, and lactating rats to assess the site of synthesis and potential secretion characteristics of interleukin-1beta in the rat magnocellular neurosecretory system. Interleukin-1beta immunoreactivity was localized within both oxytocin and vasopressin neurons in the paraventricular, supraoptic, accessory and periventricular hypothalamic nuclei. Additionally, interleukin-1beta immunoreactive fibers were localized in the zona interna and zona externa of the median eminence and in the neurohypophysis. Immunoelectron microscopic analysis revealed that interleukin-1beta immunoreactivity is associated with small spherical structures, distinct from neurosecretory granules, in neurosecretory axons within the neurohypophysis. Furthermore, stimulation of heightened neurosecretory activity via chronic osmotic challenge and lactation resulted in a marked diminution in levels of interleukin-1beta immunoreactivity in the neurohypophysis with a subsequent return to normal levels after cessation of the stimuli. Western blot analysis confirmed the existence of interleukin-1beta protein in the neurohypophysis and provided further evidence for reduction in levels of IL-1beta immunoreactivity after stimulation of secretory activity. These results suggest an endogenous neuronal source of interleukin-1beta exists within the rat magnocellular neurosecretory system under normal physiological conditions. The potential for activity-dependent release of IL-1beta and implications for the involvement of interleukin-1beta in regulation of neurosecretory activity are discussed.

journal_name

J Neurosci Res

authors

Watt JA,Hobbs NK

doi

10.1002/(SICI)1097-4547(20000515)60:4<478::AID-JNR

keywords:

subject

Has Abstract

pub_date

2000-05-15 00:00:00

pages

478-89

issue

4

eissn

0360-4012

issn

1097-4547

pii

10.1002/(SICI)1097-4547(20000515)60:4<478::AID-JNR

journal_volume

60

pub_type

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