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pubmed-article:11642733pubmed:abstractTextThe pineal gland is part of the neuroendocrine system that modulates immune functions. Because the gland is outside the blood-brain barrier, it is accessible to direct feedback from circulating cytokines that affect the synthesis and secretion of melatonin. Recent studies have suggested that intrinsic immunoregulatory cytokines mediate these neuro-immune interactions under the control of sympathetic innervation to the pineal. This study focused on the expression of transforming growth factor-beta1 (TGF-beta1) and interleukin-6 (IL-6), two cytokines that have important regulatory functions on both neurons and immune cells. Northern blot RNA analysis showed that TGF-beta1, but not IL-6, was expressed in freshly dissected rat pineal glands from neonatal age (1-day-old) into adults. Immunocytochemistry for TGF-beta1 in adult glands revealed localization of this protein in astrocyte-like cells. The sympathetic neurotransmitter norepinephrine (NE) increased transcript levels for both TGF-beta1 and IL-6 in adult pineal organ cultures. The effect of NE on IL-6 expression was not found in dispersed cell cultures established from neonatal pineal glands. The immunoregulatory molecule interleukin-1beta (IL-1beta) up-regulated the expression of both IL-6 and TGF-beta1 in adult pineal organ cultures, but not in neonate pineal organ cultures. These findings suggest that TGF-beta1 and IL-6 have intrinsic regulatory roles in the pineal gland and that both neural and immune factors are important mechanisms of regulation.lld:pubmed
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pubmed-article:11642733pubmed:authorpubmed-author:MAP YPYlld:pubmed
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pubmed-article:11642733pubmed:pagination1135-41lld:pubmed
pubmed-article:11642733pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:11642733pubmed:articleTitleTGF-beta1 and IL-6 expression in rat pineal gland is regulated by norepinephrine and interleukin-1beta.lld:pubmed
pubmed-article:11642733pubmed:affiliationLoyola University Medical Center, Stritch School of Medicine, Department of Cell Biology, Neurobiology and Anatomy, Maywood, IL, USA.lld:pubmed
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pubmed-article:11642733pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:11642733pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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