Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P50502 (Hip)
 7,003 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Hip-Arg-Phe-, Hip-Phe-Arg- and Hip-His-Leu-cleaving dipeptidyl carboxypeptidase activities were measured in the supernatant (S2) and pellet (P2) fractions obtained by ultracentrifugation of human adrenal tumor preparations. Negligible enzyme activity was found in cortical tumor whereas highly significant activities were present in the P2 fractions of the two pheochromocytoma specimens. The hydrolysis rates, expressed in terms of the percent of added substrate were 58-66%/60 min for Hip-Phe-Arg, 55-58%/60 min for Hip-Arg-Phe and 19-30%/60 min for Hip-His-Leu. The angiotensin-converting enzyme inhibitor, captopril, differentially inhibited the enzyme splitting Hip-His-Leu versus the one cleaving Hip-Arg-Phe; Hip-Phe-Arg is probably the substrate of both. It is concluded that the Hip-Arg-Phe-cleaving enzyme in adrenomedullary tumor is probably identical to the purportedly novel dipeptidyl carboxypeptidase that we detected earlier in rabbit ear artery wall, which converts (Met5)-enkephalin-Arg6,Phe7 to (Met5)-enkephalin.
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PMID:Hip-Arg-Phe-, Hip-Phe-Arg- and Hip-His-Leu-cleaving dipeptidyl carboxypeptidases in human adrenal tumors. 957 25

We used resting-state functional magnetic resonance imaging to measure the amplitude of low-frequency fluctuations (ALFF) of intrinsic brain activity in 23 patients with moderate Alzheimer's disease (AD) and 27 age- and gender-matched healthy controls. Two different frequency bands were analyzed (slow-5:0.01-0.027 Hz; slow-4:0.027-0.073 Hz). In many brain regions, widespread ALFF differences between the two frequency bands were observed, including predominantly the posterior cingulate cortex/precuneus (PCC/PCu), hippocampus/parahippocampal gyrus (Hip/PHG), insula, thalamus, and basal ganglia. Compared to controls, AD patients showed decreased ALFF values in the bilateral PCC/PCu, inferior parietal lobe, and several temporal regions, and increased ALFF values mainly in the bilateral Hip/PHG, and middle and inferior temporal gyri. Intriguingly, the ALFF abnormalities in the left PCu, left supramarginal gyrus, and several temporal regions were greater in the slow-5 band compared to the slow-4 band. Moreover, correcting for gray matter volume loss significantly affected the functional analytical results, suggesting that gray matter loss can partially account for the functional imaging analytical results obtained in AD. Finally, we showed that regions with changes in ALFF demonstrated a significant correlation with patient cognitive performance as measured using Mini-Mental State Examination scores. The results also demonstrated a significant correlation between hippocampal volume and the ALFF in slow-5 band in the AD group. This study demonstrated widespread ALFF abnormalities of intrinsic brain activity in AD and revealed that the ALFF abnormalities in severe specific regions were frequency-dependent. Taken together, our findings provided novel insights into the pathophysiological mechanism of AD and may be helpful in the development of imaging biomarkers for disease diagnosis.
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PMID:Abnormal amplitude of low-frequency fluctuations of intrinsic brain activity in Alzheimer's disease. 2447 86