Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P01185 (vasopressin)
 23,126 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Linear vasopressin analogs lacking a cyclic hexapeptide ring have recently been reported to possess vasopressin antagonist activity. In conscious, chronically catheterized, euhydrated Sprague-Dawley rats, we have compared the effects of two noncyclic vasopressin analogs, peptide 1 ([1-admantaneacetic acid,2-(O-ethyl)-D-tyr,4-val,6-(2-aminobutyric acid),9-arg]arginine vasopressin) and peptide 2 ([1-propionic acid, 2-(O-ethyl)-D-tyr,4-val,6-(2-aminobutyric acid),9- arg]arginine vasopressin), with a cyclic arginine vasopressin antagonist (SK&F 105494; [1-des cysteine, cyclo(2-O-ethyl-D-tyrosine,6-L-(2-amino-6,6-cyclopentamethylene suberic acid], 4-valine,7-arginine,8-D-arginine, 9-des glycine]-vasopressin). All three analogs caused a dose-dependent increase in urine flow by increasing free-water clearance without significantly changing osmotic clearance or sodium excretion, indicating true functional vasopressin antagonism. Peptides 1 and 2 were as efficacious in inducing a diuresis as SK&F 105494. The order of diuretic potency among the three analogs in vivo was the same as the order of potency determined by in vitro binding to rat renal membrane homogenates, suggesting that the analogs exerted their diuretic effect by acting at renal vasopressin receptors. Thus, noncyclic vasopressin analogs, which are easier to synthesize then cyclic structures, could provide new strategies in the design of drugs for the treatment of water balance disorders.
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PMID:Noncyclic vasopressin analogs are effective diuretics in conscious rats. 260 Aug 7

Prolyl endopeptidase (PEP, EC 3.4.21.26) is an enzyme which plays a role in the metabolism of proline-containing neuropeptides, e.g., vasopressin, substance P and thyrotropin-releasing hormone (TRH), which have been suggested to be involved in learning and memory processes. In our systematic screening for PEP inhibitors from traditional Chinese medicines, we found that MeOH extract from the underground part of Rhodiola sacra S. H. Fu shows significant inhibitory activity against PEP from Flavobacterium meningosepticum. Examination of the constituents of the extract resulted in the isolation of nineteen known compounds, identified as hydroquinone (1), 4-hydroxybenzoic acid (2), caffeic acid (3), 4-hydroxycinnamic acid (4), suberic acid (5), protocatechuic acid (6), gallic acid (7), (-)-epigallocatechin 3-O-gallate (8), 2-phenylethyl beta-D-glucopyranoside (9), 3-O-galloylepigallocatechin-(4beta-->8)-epigallocatechin+ ++ 3-O-gallate (10), 2-phenylethyl alpha-L-arabinopyranosyl-(1-->6)-beta-D-glucopyranoside (11), sacranoside A (12), beta-D-glucopyranosyl 4-hydroxybenzoate (13), rhodiocyanoside A (14), rhodiooctanoside (15), sarmentosin (16), heterodendrin (17), arbutin (18) and 4-O-(beta-D-glucopyranosyl)-gallic acid (19). Among these, 1, 2, 5, 8-10, 13, 16, 18 and 19 have been isolated for the first time from R. sacra, among which 5, 9, 10, 13, 16, 18 and 19 have been isolated from Rhodiola plants for the first time. On the PEP inhibition, seven compounds (6-8, 10, 12, 18, 19) showed inhibition with an 1C50 of 27.8, 487, 1.47, 0.437, 348, 391 and 215 microM, respectively. The kinetic study of these inhibitors indicated that they are noncompetitive inhibitors, except for 6 which is a competitive inhibitor.
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PMID:Prolyl endopeptidase inhibitors from the underground part of Rhodiola sacra S. H. Fu. 1007 34