Neuropeptides and Chemical Messengers in the Aging Brain
This presentation is a review of the rapidly expanding scientific knowledge regarding chemical messengers in the aging brain. There are two major classes of chemical messengers—neurotransmitters and neuropeptides. This paper focuses upon the peptide hormones — brain and peripheral. In the past the two classes of chemical messengers were assumed to be associated with either the nervous system or the endocrine system and were believed to have distinctly different modes of communication. Now it appears there is a degree of overlap, a sharing of selected communication methods and a combining of the activities of the two systems to affect the functioning of groups of cells.
KeywordsGrowth Hormone Thyroid Hormone Biogenic Amine Vasoactive Intestinal Polypeptide Peptide Hormone
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