Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0235394 (wasting)
 8,040 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Currently available protease inhibitors are associated with development of a group of metabolic disorders. These include a peripheral lipodystrophy syndrome in which there is fat wasting in the face, arms, and legs; fat accumulation in the abdomen, dorsocervical region, and/or breasts (women only); as well as hyperlipidemia, hypercholesterolemia, and insulin resistance. A review of 15 observational studies and case reports shows that the incidence of the peripheral lipodystrophy syndrome increases with time of exposure to protease inhibitors, with a >60% incidence seen after 1 year of continuous treatment. Protease inhibitors are hypothesized to cause this syndrome by impairing conversion of retinoic acid to cis-9-retinoic acid (leading to impaired peripheral fat storage, sequestration of body fat to central adipocytes, and hyperlipidemia) and by inhibiting low-density lipoprotein receptor-related protein (LRP), thus preventing postprandial chylomicron clearance and further contributing to hyperlipidemia. Recent in vitro data suggest that more than one pathway contributes to the lipodystrophy syndrome and that pathways may differ among protease inhibitors. Although the central fat accumulation, hyperlipidemia, and insulin resistance components of this syndrome may reverse after discontinuation of protease inhibitor therapy, it is not known whether complete normalization of fast-wasted body regions is possible. Prospective controlled studies are needed to define whether protease inhibitors currently under development are less prone to produce the lipodystrophy syndrome.
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PMID:Metabolic disorders among HIV-infected patients treated with protease inhibitors: a review. 1112 25

Deregulated phosphate homeostasis can lead to a wide range of disorders, including myopathy, cardiac dysfunction, and skeletal abnormalities. Therefore, characterization of the molecular regulation of phosphate metabolism is of pathophysiological and clinical significance. Hyp mouse is the model for human X-linked hypophosphatemia which is due to mutations that inactivate the endopeptidases of the X chromosome (PHEX). PHEX inactivation leads to increased serum levels of fibroblast growth factor 23 (FGF23), a phosphaturic hormone that induces excessive renal phosphate excretion and severe hypophosphatemia. The expression of WNT signaling components is increased in Hyp mice. To determine the potential role of WNT signaling in FGF23-mediated hypophosphatemia, we cross-bred Hyp mice with mice deficient in the WNT coreceptor low-density lipoprotein receptor-related protein 6 (Lrp6) to generate Hyp and Lrp6 double mutant mice (Hyp/Lrp6). Like Hyp mice, Hyp/Lrp6 double mutants maintained high serum levels of FGF23, and accordingly exhibited hypophosphatemia to the same degree as the Hyp mice did, indicating that genetically reducing WNT signaling does not impact FGF23-induced phosphaturia. Moreover, similar to Hyp mice, the Hyp/Lrp6 double mutants also exhibited reduced mineralization of the bone, further supporting that reduced WNT signaling does not affect the chronic phosphate wasting caused by excess FGF23 in these mice. In further support of our finding, injection of bioactive FGF23 protein into Lrp6 mutant mice reduced serum phosphate levels to a similar degree as FGF23 injection into wild-type mice. Our in vivo studies provide genetic and pharmacological evidence for a WNT-independent function of FGF23 in the regulation of phosphate homeostasis.
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PMID:FGF23-induced hypophosphatemia persists in Hyp mice deficient in the WNT coreceptor Lrp6. 2365 55