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Aging is characterized by changes in neuroendocrine/endocrine functions which are manifest in female reproductive physiology and less perceptible in other functions such as thyroid, adrenal or growth/metabolic functions. The contribution of each level of the axis - hypothalamus, adenohypophysis or peripheral tissues - is not clearly established. Functional impairments with age are recognized in the peripheral glands (gonad, thyroid, adrenal) as well as in the pituitary, but increasing evidence is accumulating for a marked contribution of the hypothalamus in the age-associated endocrine changes observed in animals and humans. In old rats, multineuronal dysfunctions are demonstrated in the hypothalamus, with a documented decline in the activity of the neurons producing dopamine and thyrotropin-releasing hormone, and to a lesser extent luteinizing hormone- and growth hormone-releasing hormones, and alterations in regulatory mechanisms of these neurons are disclosed. Moreover, impairments are observed in the processing - binding, accumulation and intracellular distribution - of hypothalamic hormones in the adenohypophysis of old rats. Taken together, these observations are supportive of the view that the neuroendocrine/endocrine changes appearing with age result from a complex balance of functional alterations occurring at each level - central and peripheral - of the axis.
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http://dx.doi.org/10.1159/000181083 | DOI Listing |
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Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, 310003, China.
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Natural Products and Medicinal Plants Research Center, North Khorasan University of Medical Sciences, Bojnurd, Iran.
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