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Endocrinology, Vol 137, 2947-2953, Copyright © 1996 by Endocrine Society

ARTICLES

Hypothalamic and pituitary leukemia inhibitory factor gene expression in vivo: a novel endotoxin-inducible neuro-endocrine interface

Z Wang, SG Ren and S Melmed
Division of Endocrinology and Metabolism, Cedars-Sinai Research Institute, Los Angeles, California 90048-1865, USA.

We have recently shown expression of leukemia inhibitory factor (LIF) in human fetal pituitary tissue and its in vitro induction of POMC transcription. We now use qualitative and semiquantitative RT-PCR to demonstrate that LIF and LIF-receptor (LIF-R) are constitutively expressed in the normal mouse hypothalamus and pituitary. Hypothalamic and pituitary LIF and LIF-R are significantly induced (up to 6- and 4- fold, respectively) in vivo in response to lipopolysaccharide endotoxin (LPS) administered to B6D2F1 and C57BL/6 mice. In contrast to the nearly exclusive expression of matrix-associated LIF messenger RNA (mRNA) in control hypothalamus and pituitary, both diffusible and matrix-associated LIF mRNA alternate transcripts are induced by LPS. Furthermore, the time course of peripheral ACTH-response to LPS peaks at 60 min, whereas hypothalamic LIF mRNA increase occurs at 30 min and pituitary LIF induction occurs at 60 min. These results show that mLIF is a novel LPS-inducible proinflammatory neuroendocrine cytokine and the alternatively spliced diffusible LIF may play a paracrine role in activating pituitary ACTH secretion in synergy with hypothalamic CRH, implying a mechanism for central nervous system cytokine responses to immune signals.


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