1Assistant Professor of Biochemistry, School of Medicine and Physiology Research Center, Kerman University of Medical Sciences and Health Services, Kerman, Iran
2Associate Professor of Biochemistry, School of Medicine and Physiology Research Center, Kerman University of Medical Sciences and Health Services, Kerman, Iran
3Assistant Professor of Internal Medicine, School of Medicine and Physiology Research Center, Kerman University of Medical Sciences and Health Services, Kerman, Iran
4Master of Science in Biochemistry
Introduction: Leptin and Ghrelin are hormones that have been discovered in the last decade and were
shown to be involved in appetite and metabolism regulation and body weight. Thyroid hormones are also
involved in general metabolism and changes in their circulating levels bring about changes in appetite and
body weight. Results of animal and human studies regarding Leptinlevel and its relation to thyroid hormones
are opposing each other, and there is no data about Ghrelin level in thyroid malfunction. To determine the
relation between thyroid function and circulating levels of Ghrelin and Leptin, we evaluated serum
concentration of these hormones in patients with untreated thyroid malfunction.
Method: Thirty hyperthyroid and 30 hypothyroid females that were aged between 14-52 years and 30
healthy females with the same age range (control group) were randomly selected. From each participant 5
ml of fasting blood was collected and after processing, serum levels of T4, T3, T3-uptake, TSH, Leptin and
Ghrelin were evaluated by radio-immunoassay or enzyme-link immunoassay methods.
Results: Evaluated results showed that neither Ghrelin nor Leptin levels show significant change in patients
with thyroid malfunction. But there was a positive significant correlation between Leptin level and BMI of all
participants (r=0.41, P<0.01). In addition, there were negative significant correlations between Ghrelin and
thyroid hormones (r=0.27, P<0.05).
Conclusion: The present results show that Leptin variation is due to BMI. Furthermore, negative and weak
correlation between thyroid hormones and Ghrelin may indicate that increase in appetite of hyperthyroid
patients and its decrease in hypothyroid patients are not due to circulating level of Ghrelin