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Severe obesity with hypo-leptinemia
Masanori Kita1, Shuhei Morita1, Hiroyuki Ariyasu2
1First Department of Medicine, Wakayama Medical University, Wakayama 641-8509, Japan.
Endocrine Journal
|March 25, 2025
Summary
Hypo-leptinemia, a condition of low leptin, is linked to obesity and increased appetite. In severe obesity cases, leptin replacement therapy may be considered even without genetic abnormalities.
Area of Science:
- Endocrinology
- Metabolic Disorders
- Obesity Research
Background:
- Obesity is sometimes associated with hypo-leptinemia, potentially leading to increased appetite and weight gain.
- Leptin replacement therapy is a theoretical treatment for hypo-leptinemia-related obesity, but requires further case studies.
Purpose of the Study:
- To investigate serum leptin levels and their correlation with body mass index (BMI) in 107 obese patients.
- To identify individuals with hypo-leptinemia and analyze a specific case of congenital hypopituitarism with severe obesity.
Main Methods:
- Serum leptin levels and BMI were measured in 107 obese patients.
- A detailed clinical and pathological investigation was conducted on one patient with congenital hypopituitarism, including genetic analysis and electron microscopy of adipose tissue.
Main Results:
- One patient with congenital hypopituitarism presented with severe obesity (BMI 41.5 kg/m²), central hypogonadism, diabetes insipidus, growth hormone deficiency, cognitive impairment, and abnormal eating behavior.
- Genetic analysis showed no mutations in leptin-related genes. Subcutaneous adipose tissue revealed relatively smaller adipocytes compared to a BMI-matched control.
- The patient experienced progressive health issues, including dialysis and eventual death from pneumonia.
Conclusions:
- Severe obesity with hypo-leptinemia may involve disturbances in adipocyte expansion due to unknown dysfunctions.
- Leptin-replacement therapy could be considered for severely obese patients with hypo-leptinemia, even in the absence of identified abnormalities in leptin-related genes.
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