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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Effects of hydrosaline treatments on prolyl endopeptidase activity in rat tissues.

Enzymatic cleavage of some peptide hormones, neurotransmitters and neuromodulators could be implicated in the regulation of extra- and intracellular fluid volume and osmolality. Prolyl endopeptidase is known to hydrolyze several peptides, which act on hydromineral balance, such as angiotensins, bradykinin, vasopressin, oxytocin, thyrotropin-releasing hormone, neurotensin and opioids. In this work, we analyzed the effects of certain volume and/or osmotic changes in the activity of the soluble and membrane-bound prolyl endopeptidase in several brain areas, heart, lungs, kidney and adrenal and pituitary glands of the rat. Soluble prolyl endopeptidase activity was higher in the renal cortex of the chronic salt-loaded rats than in the control rats. In the water-deprived and polyethylene glycol-treated rats, heart particulate prolyl endopeptidase was lower than in the control rats. Particulate prolyl endopeptidase was also lower in the adrenal gland of the acute salt-loaded rats and in the brain cortex of the water-loaded rats than in the control rats. Data suggest that tissue-dependent peptide hydrolysis evoked by prolyl endopeptidase activity is involved in the water-electrolyte homeostasis.[1]


  1. Effects of hydrosaline treatments on prolyl endopeptidase activity in rat tissues. Irazusta, J., Silveira, P.F., Gil, J., Varona, A., Casis, L. Regul. Pept. (2001) [Pubmed]
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