Cited by 800Adipokines, Inflammation, and Metabolic DiseasesRegulation of Appetite and ObesityLipid metabolism and disorders

The DOI matches its Crossref record; 32 of the 33 references it cites were found in a registry or an index, and 1 are not checked yet; 13 of the 27 sources its claims cite were checked for support.

Leptin reverses insulin resistance and hepatic steatosis in patients with severe lipodystrophy

Open access

Abstract

Lipodystrophy is a rare disorder that is characterized by selective loss of subcutaneous and visceral fat and is associated with hypertriglyceridemia, hepatomegaly, and disordered glucose metabolism. It has recently been shown that chronic leptin treatment ameliorates these abnormalities. Here we show that chronic leptin treatment improves insulin-stimulated hepatic and peripheral glucose metabolism in severely insulin-resistant lipodystrophic patients. This improvement in insulin action was associated with a marked reduction in hepatic and muscle triglyceride content. These data suggest that leptin may represent an important new therapy to reverse the severe hepatic and muscle insulin resistance and associated hepatic steatosis in patients with lipodystrophy.

Verified 2026-10-10 · 1 reference not checked yet

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

In three patients with severe generalized lipodystrophy, chronic recombinant leptin treatment improved insulin-stimulated hepatic and peripheral glucose metabolism and reduced hepatic and muscle triglyceride content. These changes suggest leptin may reverse severe insulin resistance and hepatic steatosis in lipodystrophy.

Key findings

  • Before leptin, lipodystrophic patients had severe insulin resistance: glucose infusion rate was 1.2 ± 0.2 vs. 12.7 ± 0.9 mg/kg/min in controls (P < 0.0001), insulin suppression of glucose production was 40% ± 6% vs. 92% ± 7% (P = 0.0004), and fasting glucose production was 3.6 ± 0.8 vs. 1.9 ± 0.1 mg/kg/min (P = 0.019).
  • After leptin, glucose infusion rate increased approximately fourfold to 5.4 ± 0.9 mg/kg/min (P = 0.04), insulin suppression of glucose production improved to 82% ± 5% (P < 0.05), and whole-body insulin-stimulated glucose metabolism was 6.1 ± 1.0 vs. 3.5 ± 0.3 mg/kg/min before treatment (P = 0.08).
  • Leptin reduced hepatic triglyceride content by 86% ± 8% (P = 0.008) and muscle triglyceride content by 33% ± 3% (P = 0.006); muscle total fatty acyl CoA concentrations decreased by approximately 30%.
  • Group mean fasting plasma glucose fell from 234 ± 14 to 122 ± 21 mg/dl (P < 0.05 vs. before treatment), and triglycerides fell from 5851 ± 5079 to 1134 ± 523 mg/dl in Table 1.

Methods

  • Three patients with severe generalized lipodystrophy and diabetes (fasting leptin < 4 ng/ml) were studied before and after leptin treatment for 3 months, with patient NIH-1 treated for an additional 5 months; six healthy nonsmoking women of similar age, weight, and BMI served as controls.
  • Insulin sensitivity was assessed by hyperinsulinemic-euglycemic clamp with [6,6-2H2]glucose turnover; lipolysis by [2H5]glycerol turnover; liver and muscle triglyceride by 1H NMR; body fat by DEXA; muscle fatty acyl CoA by biopsy in patient NIH-6; and energy intake/expenditure by monitored diet and indirect calorimetry.
  • Differences between controls and lipodystrophic subjects were assessed by Student t tests, and before- vs. after-leptin differences by paired Student t tests; data are mean ± SEM.

Limitations

  • The paper does not include a formal limitations section. Evident from the text: the study is very small (3 lipodystrophic patients), open-label, and uses a before-after design without a placebo control.
  • Treatment duration differed across patients (3 months for all, 8 months for NIH-1), and some measurements were made in only one patient (energy intake and muscle fatty acyl CoA in NIH-6).
  • The paper states that a lipolytic effect of leptin on tissues “cannot be ruled out”; it also reports non-significant changes in glycerol turnover (P = 0.23) and energy expenditure (P = 0.08), so the mechanism is not fully established.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1172/jci0215001

Cites

32 of 33 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

13 of 27 cited sources checked · 6 supported · 2 flagged · accuracy not yet measured

Show all 25 claims

  • Probably not a substantial claim. 6
  • It may state two separate claims as one. 10
  • The quote only partly states this claim. 2
14 of 14
  • The paper relies on this without support.

    The observed improvements after leptin treatment are attributable to leptin rather than to other concurrent changes or factors.

    “At the time of the postleptin treatment study, all patients had their antidiabetic medication discontinued (5).”
  • The paper relies on this without support.

    The three studied lipodystrophic patients are representative of patients with severe lipodystrophy.

    “Three patients with severe, generalized lipodystrophy (fasting leptin concentration less than 4 ng/ml) associated with diabetes were studied.”
2 of 2

Claims other papers make about this one

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Citations

Cites

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Show all 26 references

Research works printed but not linked: 1

  1. Szczepaniak, 1999, Am J Physiol, 276, E977

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Metadata

Authors
Petersen, K. F., Oral, E. A., Dufour, S., Befroy, D., Ariyan, C., Yu, C., Cline, G. W., DePaoli, A. M., Taylor, S. I., Gorden, P., & Shulman, G. I.
Affiliations
  • Yale University (US)
  • National Institutes of Health (US)
  • Howard Hughes Medical Institute (US)
  • Amgen (United States) (US)
Corresponding author
Petersen, Kitt Falk
Venue
Journal of Clinical Investigation
Published
2002-05-15
Volume
109
Issue
10
Pages
1345-1350
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2164714249
Cited by
800
References
26
Citations by year
2026: 10 · 2025: 10 · 2024: 20 · 2023: 21 · 2022: 23 · 2021: 27 · 2020: 25 · 2019: 29 · 2018: 29 · 2017: 31 · 2016: 38 · 2015: 39 · 2014: 34 · 2013: 45 · 2012: 35
FWCI
26.14
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Diabetes Association
  • Yale University
  • National Institutes of Health (P30 DK)
  • National Institute of Diabetes and Digestive and Kidney Diseases (K-23 DK-02347, R01 DK-42930, P30DK045735)
  • National Center for Research Resources (M01RR000125)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adipokines, Inflammation, and Metabolic Diseases
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Lipid metabolism and disorders
Keywords
leptin, lipodystrophy, insulin resistance, hepatic steatosis, hepatic glucose metabolism, muscle glucose metabolism, triglyceride accumulation, hypertriglyceridemia, hepatomegaly
MeSH terms
Adult, Diabetes Mellitus, Type 2, Fatty Liver, Female, Humans, Insulin Resistance, Lipodystrophy, Liver, Hypertriglyceridemia, Leptin

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