Abstract
OBJECTIVES: We investigated whether the incretin hormones glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), which are major regulators of glucose tolerance through the stimulation of insulin secretion, contribute to impaired glucose tolerance (IGT) among HIV-infected patients on highly active antiretroviral therapy (HAART).
METHODS: Eighteen HIV-infected male patients (six lipodystrophic and 12 nonlipodystrophic) with normal glucose tolerance (NGT) were compared with 10 HIV-infected male patients (eight lipodystrophic and two nonlipodystrophic) with IGT. Plasma concentrations of GLP-1 and GIP were determined frequently during a 3-h, 75-g glucose tolerance test. Insulin secretion rates (ISRs) were calculated by deconvolution of C-peptide concentrations.
RESULTS: The incremental area under the curve (incrAUC) for GLP-1 was increased by 250% in IGT patients compared with NGT patients (1455+/-422 vs. 409+/-254 pmol/L/180 min, respectively; P<0.05), whereas the incrAUC for GIP did not differ between the study groups (7689+/-1097 vs. 8041+/-998 pmol/L/180 min, respectively; not significant). In pooled study groups, the GIP incrAUC correlated positively with the ISR incrAUC without adjustment (r=0.38, P<0.05) and following adjustment for glucose incrAUC (r=0.49, P<0.01).
CONCLUSIONS: Our data suggest: (1) that glucose-intolerant, HIV-infected male patients may display enhanced GLP-1 responses to oral glucose compared with normal glucose-tolerant HIV-infected male patients, which may represent a compensatory mechanism rather than explain the IGT; (2) that the GIP response may be associated with ISR independently of plasma glucose in nondiabetic HIV-infected males on HAART.
Original language | English |
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Journal | HIV Medicine |
Volume | 6 |
Issue number | 2 |
Pages (from-to) | 91-8 |
Number of pages | 8 |
ISSN | 1464-2662 |
DOIs | |
Publication status | Published - Mar 2005 |
Keywords
- Adult
- Analysis of Variance
- Antiretroviral Therapy, Highly Active
- Antiviral Agents
- Area Under Curve
- Blood Glucose
- Body Composition
- C-Peptide
- Gastric Inhibitory Polypeptide
- Glucagon
- Glucagon-Like Peptide 1
- Glucose
- Glucose Intolerance
- Glucose Tolerance Test
- HIV Infections
- HIV-Associated Lipodystrophy Syndrome
- Humans
- Male
- Peptide Fragments
- Protein Precursors