Melatonin action on thyroid activity in the soft-shelled turtle, Lissemys punctata punctata

• Authors: S. Sarkar , N.K. Sarkar , S. Bhattacharyya , P. Das
• Languages of publication: EN

Abstracts

EN

Adult female turtles (Lissemys punctata punctata) were treated with pineal indoleamine melatonin (100 mug/100 g) or the antithyroid agent, methylthiouracil (100 mug/100 g) or melatonin together with methylthiouracil (100 mug of each drug/100 g) for 12 days. Melatonin alone inhibited thyroid activity as evidenced by reductions in the gland weight, follicular epithelial cell height, thyroid peroxidase, and plasma thyroxine levels. Methylthiouracil caused hyperplasia of the gland, although it inhibited thyroid activity and reduced thyroid peroxidase and plasma thyroxine levels. Melatonin together with methylthiouracil produced changes similar to those obtained with melatonin alone. The results indicate that melatonin probably exerts inhibitory effects influences on both thyrotropin release from the pituitary and the activity of the thyroid itself in turtles.

Keywords

EN

MELATONIN; METHYLTHIOURACIL; THYROID ACTIVITY; TURTLE

Discipline

• EXPERIMENTAL_BIOLOGY_&_MEDICINE: EXPERIMENTAL BIOLOGY & MEDICINE

• Publisher: Institute of Systematics and Evolution of Animals, Polish Academy of Sciences
• Journal: Folia Biologica
• Year: 1997
• Volume: 45
• Pages: 109-112

Contributors

author

S. Sarkar

author

N.K. Sarkar

author

S. Bhattacharyya

author

P. Das

• Document Type: article
• Publication order reference: S.Sarkar, Department of Microbiology, National Institute of Cholera and Enteric Diseases, P-33 C.I.T Road, Scheme XM, Beliaghata, Calcutta 700010, West Bengal, India