Iodine metabolism in dispersed pharyngeal and head kidney teleostean thyroid cells obtained by continuous trypsinization

Bhattacharya, Samir; Das, Ranjana; Datta, Asoke G.

doi:10.1016/0016-6480(76)90073-3

Cited by 7 publications

(1 citation statement)

References 7 publications

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“…Extra-pharyngeal thyroid follicle populations have been reported to be less active than (Bhattacharya et al, 1976), of equal activity to (Frisén and Frisén, 1967) or more active than (Chavin and Bouwman, 1965;Peter, 1970;Srivastava and Sathyanesan, 1971) the subpharyngeal thyroid tissue. The general opinion is that these heterotopic follicles work in concert with the subpharyngeal thyroid and contribute to the thyroid status of an animal.…”

Section: Introductionmentioning

confidence: 99%

Comparative thyroidology: thyroid gland location and iodothyronine dynamics in Mozambique tilapia (Oreochromis mossambicus Peters) and common carp (Cyprinus carpio L.)

Geven

Nguyen

Boogaart

et al. 2007

Journal of Experimental Biology

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SUMMARY In teleosts, the thyroid gland is mostly found in the subpharyngeal region. However, in several species thyroid follicles are found in, for example,heart, head kidney and kidney. Such heterotopic thyroid follicles are active,and considered to work in concert with the subpharyngeal thyroid. In Mozambique tilapia (Oreochromis mossambicus) thyroid activity is,indeed, restricted to the subpharyngeal region; in common carp (Cyprinus carpio) the functional endocrine thyroid is associated with renal tissues. The subpharyngeal follicles of carp comprise only 10% of the total thyroid tissue, and these follicles neither accumulate iodide nor synthesize or secrete thyroid hormones to a significant degree. Although the shape and size of carp subpharyngeal and renal follicles vary, the epithelial cell height of the thyrocytes and thyroxine immunoreactivity do not differ, which suggests that the activity of the carp subpharyngeal thyroid follicles is dormant. Differences in thyroid physiology between the two fish species were further assessed at the level of peripheral thyroid hormone metabolism. Carp clears plasma of thyroid hormones faster than tilapia does. Furthermore, a significant amount of conjugated thyroid hormones was observed in the plasma of tilapia, which was preceded by the occurrence of thyroid hormone conjugates in the subpharyngeal region and coincides with the appearance of conjugates in the surrounding water. Apparently, plasma thyroid hormone conjugates in tilapia originate from the thyroid gland and function in the excretion of thyroid hormones. Our data illustrate the variability in teleostean thyroidology, an important notion for those studying thyroid physiology.

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Section: Introductionmentioning

confidence: 99%

Comparative thyroidology: thyroid gland location and iodothyronine dynamics in Mozambique tilapia (Oreochromis mossambicus Peters) and common carp (Cyprinus carpio L.)

Geven

Nguyen

Boogaart

et al. 2007

Journal of Experimental Biology

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Thyrotropic activity of salmon pituitary glycoprotein hormones in the Hawaiian parrotfish thyroid in vitro

et al. 1988

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The thyrotropic activities of salmon pituitary extract, thyroid-stimulating hormone (TSH), gonadotropins (GTH), and glycoprotein fractions obtained during purification of salmon TSH and GTH were measured using the parrotfish thyroid culture system. Purified salmon TSH was approximately 1,000 times more potent than bovine TSH in stimulating thyroxine release into the culture medium. Most of the forms of salmon GTH had no thyrotropic activity. One of the forms of salmon GTH (GTH-F) and three chromatofocusing fractions (CF-B, -C, and -E) that were devoid of activity in the coho salmon in vivo had some thyrotropic activity in the parrotfish thyroid culture. Whether the activity of these fractions was due to contamination with TSH, less potent forms of TSH, or inherent thyrotropic activity of a form of GTH is discussed. These results indicate that the parrotfish thyroid culture system can be used to detect thyrotropic activity of fractions obtained during the purification of teleost TSH.

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Bovine TSH-stimulation of fish thyroid peroxidase activity and role of thyroxine thereon

Chakraborti

Bhattacharya

1978

Experientia

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Iodine metabolism in dispersed pharyngeal and head kidney teleostean thyroid cells obtained by continuous trypsinization

Cited by 7 publications

References 7 publications

Comparative thyroidology: thyroid gland location and iodothyronine dynamics in Mozambique tilapia (Oreochromis mossambicus Peters) and common carp (Cyprinus carpio L.)

Comparative thyroidology: thyroid gland location and iodothyronine dynamics in Mozambique tilapia (Oreochromis mossambicus Peters) and common carp (Cyprinus carpio L.)

Thyrotropic activity of salmon pituitary glycoprotein hormones in the Hawaiian parrotfish thyroid in vitro

Bovine TSH-stimulation of fish thyroid peroxidase activity and role of thyroxine thereon

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