Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/5684
Title: Thyroid status alters gill ionic metabolism and chloride cell morphology as evidenced by scanning electron microscopy in a teleost <i style="">Anabas testudineus</i> (Bloch): Short and long term <i style="">in vivo</i> study
Authors: Sreejith, P
Beyo, R S
Prasad, G
Sunny, F
Oommen, O V
Keywords: <i style="">Anabas testudineu</i>
Ca<sup>2+</sup>ATPase
Chloride cell
Gill
Na<sup>+</sup>K<sup>+</sup> ATPase
6-Propyl thiouracil
Teleost
Triiodothyronine
Issue Date: Dec-2007
Publisher: CSIR
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<sup>+</sup>K<sup>+ </sup>ATPase in the gill while triiodothyronine (T<sub>3</sub>) injection stimulated it in a short-term <i style="">in vivo</i> study in the teleost <i style="">Anabas testudineus</i>. Na<sup>+</sup>, K<sup>+</sup> and Ca<sup>2+</sup> ions were also decreased in the 6-PTU treated fish and the T<sub>3</sub> 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 T<sub>3</sub> treatment reversed it. T<sub>3</sub> 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<sup>+</sup> pump activity and chloride cell morphological changes. Further, the study suggests a regulatory role of T<sub>3</sub> on gill ions (Na<sup>+</sup>, K<sup>+</sup> and Ca<sup>2+</sup>), Na<sup>+</sup>K<sup>+ </sup>and Ca<sup>2+</sup> ATPase activity and the different gill cell types in <i style="">A</i>. <i style="">testudineus</i>.
Description: 1015-1021
URI: http://hdl.handle.net/123456789/5684
ISSN: 0975-1009 (Online); 0019-5189 (Print)
Appears in Collections:IJEB Vol.45(12) [December 2007]

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