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Changes in insulin sensitivity during leptin replacement therapy in leptin-deficient patients
Gilberto Paz-Filho1, Karin Esposito, Barry Hurwitz
1Dept. of Psychiatry & Behavioral Sciences, Univ. of Miami Miller School of Medicine, Miami, FL 33136, USA.
Leptin replacement therapy in deficient adults improves obesity and hypogonadism. Interrupting treatment decreased insulin resistance, suggesting high leptin levels may worsen obesity-related insulin resistance.
Area of Science:
- Endocrinology
- Metabolic Disorders
- Genetics
Background:
- Leptin replacement therapy is effective for obesity and hypogonadism in leptin-deficient individuals.
- The impact of leptin on insulin resistance in these patients remains unclear.
Purpose of the Study:
- To investigate the effects of leptin on insulin resistance in leptin-deficient adults.
- To evaluate insulin sensitivity during and after leptin replacement therapy.
Main Methods:
- Three leptin-deficient adults with a leptin gene mutation were studied.
- Insulin resistance was assessed using euglycemic hyperinsulinemic clamps and oral glucose tolerance tests (OGTTs).
- Measurements were taken during recombinant methionyl human leptin (r-metHuLeptin) treatment and after its interruption.
Main Results:
- Leptin replacement therapy initially showed a trend towards increased insulin resistance, indicated by a lower glucose infusion rate.
- However, long-term analysis (years 4-6) revealed no significant difference in insulin sensitivity.
- Discontinuation of r-metHuLeptin led to decreased insulin resistance in two patients, accompanied by weight gain.
Conclusions:
- In leptin-deficient adults, interrupting leptin therapy can decrease insulin resistance, especially with concurrent weight gain.
- Hyperleptinemia may contribute to the insulin resistance associated with obesity.
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