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Thyroid status alters gill ionic metabolism and chloride cell morphology as evidenced by scanning electron microscopy in a teleost Anabas testudineus (Bloch): short and long term in vivo study.
Indian J Exp Biol ; 2007 Dec; 45(12): 1015-21
Article in English | IMSEAR | ID: sea-58323
ABSTRACT
Gill is the main organ of osmotic regulation in teleosts and chloride cells are the sites of ion transport across gill epithelium. Thyroid hormones are implicated in the regulation of osmotic balance in teleosts also. Treatment with 6-propyl thiouracil (6-PTU) inhibited the membrane bound enzyme Na+K+ ATPase in the gill while triiodothyronine (T3) injection stimulated it in a short-term in vivo study in the teleost Anabas testudineus. Na+, K+ and Ca2+ ions were also decreased in the 6-PTU treated fish and the T3 treatment increased their concentrations in the gill lamellae. The gill morphology also changed according to the thyroid status in the long term study. 6-PTU treatment altered the typical serrated morphology of the gill lamellae, while the T3 treatment reversed it. T3 injection increased the density of pavement and chloride cells as evidenced by scanning electron microscopy. The results demonstrate that physiological status of the thyroid influences gill Na+ pump activity and chloride cell morphological changes. Further, the study suggests a regulatory role of T3 on gill ions (Na+, K+ and Ca2+), Na+K+ and Ca2+ ATPase activity and the different gill cell types in A. testudineus.
Subject(s)
Full text: Available Index: IMSEAR (South-East Asia) Main subject: Osmotic Pressure / Potassium / Sodium / Thyroid Hormones / Triiodothyronine / Perciformes / Microscopy, Electron, Scanning / Calcium / Longitudinal Studies / Calcium-Transporting ATPases Type of study: Observational study Language: English Journal: Indian J Exp Biol Year: 2007 Type: Article

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Full text: Available Index: IMSEAR (South-East Asia) Main subject: Osmotic Pressure / Potassium / Sodium / Thyroid Hormones / Triiodothyronine / Perciformes / Microscopy, Electron, Scanning / Calcium / Longitudinal Studies / Calcium-Transporting ATPases Type of study: Observational study Language: English Journal: Indian J Exp Biol Year: 2007 Type: Article