Age-related changes in the response of intestinal cells to parathyroid hormone.
The concept of the role(s) of parathyroid hormone (PTH), has expanded from that on acting on the classical target tissues, bone and kidney, to the intestine where its actions are of regulatory and developmental importance: regulation of intracellular calcium through modulation of second messengers and, activation of mitogenic cascades leading to cell proliferation. Several causes have been postulated to modify the hormone response in intestinal cells with ageing, among them, alterations of PTH receptor (PTHR1) binding sites, reduced expression of G proteins and hormone signal transduction changes. The current review summarizes the actual knowledge regarding the molecular and biochemical basis of age-impaired PTH receptor-mediated signaling in intestinal cells. A fundamental understanding of why PTH functions are impaired with age will enhance our understanding of its importance in intestinal cell physiology.
Russo de Boland
Ana
A
Dpto. Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, San Juan 670, 8000 Bahía Blanca, Argentina. aboland@criba.edu.ar
D000375:Aging / Q000502:physiology*; D000818:Animals; D006801:Humans; D007422:Intestines / Q000166:cytology / Q000502:physiology*; D010281:Parathyroid Hormone / Q000502:physiology*; D044168:Receptor, Parathyroid Hormone, Type 1 / Q000378:metabolism*; D015398:Signal Transduction
D010281:Parathyroid Hormone; D044168:Receptor, Parathyroid Hormone, Type 1