Abstract:
OBJECTIVES:We examined whether insulin-resistant lipodystrophic HIV-infected patients with known high fasting prehepatic insulin secretion rates (FISRs) displayed alterations in first-phase prehepatic insulin response to intravenous glucose (ISREG0-10 min). METHODS:Eighteen normoglycaemic lipodystrophic HIV-infected (LIPO) patients and 25 normoglycaemic nonlipodystrophic HIV-infected patients (controls) were included in the study. The prehepatic insulin secretion rate was estimated by deconvolution of C-peptide concentrations, and insulin sensitivity (SIRd) was estimated by the glucose clamp technique. The disposition index (Di=ISREG0-10 min x SIRd) was calculated to estimate the beta-cell response relative to insulin sensitivity. RESULTS:FISR was increased by 69% (P<0.001), whereas median Di was decreased by 75% (P<0.01), primarily as a result of a reduction of SI(Rd) by 60% (P<0.001) in LIPO patients compared with controls. Three LIPO groups were identified arbitrarily according to their FISR and ISREG0-10 min values relative to those of controls. Four LIPO patients displayed high FISR [+3 standard deviations (SD), P<0.001], high ISREG0-10 min (+3 SD, P<0.001) and low SIRd (P<0.01), suggesting an intact B-cell capacity to compensate insulin resistance; six LIPO patients exhibited high FISR (+3SD, P<0.001), low ISREG0-10min (-1 SD, P=0.01), and low SIRd (P<0.01), suggesting depletion of readily releasable insulin stores; the remaining eight LIPO patients and controls displayed identical FISR and ISREG0-10 min. Increased concentrations of the nonglucose insulin secretagogues triglyceride (+124%), alanine (+35%) and glucagon (+88%), and also lactate (+96%) and tumour necrosis factor (TNF)-alpha (+62%) were observed in the 10 LIPO patients with aberrations in FISR and ISREG0-10 min compared with the remaining HIV-infected patients (all P<0.05). CONCLUSION:Plasma triglyceride, alanine, glucagon, lactate and TNF-alpha may be associated with alterations in the first-phase prehepatic insulin secretion response to intravenous glucose in normoglycaemic lipodystrophic HIV-infected patients.
journal_name
HIV Medjournal_title
HIV medicineauthors
Haugaard SB,Andersen O,Pedersen SB,Dela F,Deacon CF,Holst JJ,Iversen J,Madsbad Sdoi
10.1111/j.1468-1293.2006.00364.xkeywords:
subject
Has Abstractpub_date
2006-04-01 00:00:00pages
163-72issue
3eissn
1464-2662issn
1468-1293pii
HIV364journal_volume
7pub_type
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