Leptin Gene Expression and Serum Leptin Levels in Zinc Deficiency: Implications for Appetite Regulation in Rats
| Autor: | Je-Yong Choi, In Sook Kwun, Eun Hee Kwak, John H. Beattie, Yang Ha Kim, Soo Lim Lee, Soon Tae Kwon |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Leptin
Male medicine.medical_specialty media_common.quotation_subject Appetite Medicine (miscellaneous) Adipose tissue Anorexia Weight Gain Rats Sprague-Dawley Eating Random Allocation Internal medicine Gene expression Adipocytes medicine Animals RNA Messenger media_common Nutrition and Dietetics business.industry digestive oral and skin physiology medicine.disease Rats Zinc Endocrinology Gene Expression Regulation Serum leptin Zinc deficiency medicine.symptom Energy Intake business Appetite regulation |
| Zdroj: | Journal of Medicinal Food. 6:281-289 |
| ISSN: | 1557-7600 1096-620X |
| DOI: | 10.1089/109662003772519822 |
| Popis: | Zinc deficiency in animals causes impaired growth and anorexia, and the mechanisms for these symptoms of zinc deficiency are not yet clear. We investigated whether circulating leptin levels and gene expression would be dysregulated under zinc deficiency and what would be the implications for appetite in rats. In study 1, 24 Sprague-Dawley rats were provided consecutively with three different dietary zinc intake levels: Zn-adequate (30 mg/kg of diet), Zn-depleted (1 mg/kg of diet), and Zn-replete (50 mg/kg of diet), for 1, 2, and 2 weeks, respectively. At the end of each dietary period, one-third of the rats were killed. In study 2, rats were assigned to one of the four Zn diet groups: Zn-adequate (30 mg/kg of diet), pair-fed (30 mg/kg of diet), Zn-deficient (1 mg/kg of diet), or Zn-sufficient (50 mg/kg of diet), and were fed for 4 weeks. Tissue Zn and serum leptin were measured, and leptin gene expression in adipose tissues (inguinal and abdominal) was determined by reverse transcription-polymerase chain reaction and northern blotting. Blood subfractions as plasma, red blood cells, and mononuclear cells and liver Zn level were decreased during the Zn-depletion period (P.05). Serum leptin showed a tendency to increase during the Zn-depletion period and decreased back to the level of the Zn-repletion period. Leptin mRNA levels in inguinal adipocytes also increased during the Zn-depletion (P.05) and Zn-deficient periods, which is consistent with the change in serum leptin. However, the decrease in leptin mRNA in abdominal adipocytes was not consistent with the increase in inguinal leptin levels and the change in serum leptin. Increased leptin levels in linguinal adipocytes is consistent with the expected physiological change of a decrease in appetite under Zn deficiency. However, before coming to any firm conclusion, further studies on adipose tissue-specific leptin expression, including the appetite-related neuropeptides, are necessary for clarifying the cause of lower appetite in zinc deficiency. |
| Databáze: | OpenAIRE |
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