Document Detail

The relation between pituitary gland and thyroid growth during the lifespan of the annual fish Cynolebias whitei and Nothobranchius korthausae: gonadotropic and thyrotropic cells.
MedLine Citation:
PMID:  3607854     Owner:  NLM     Status:  MEDLINE    
In the annual cyprinodont Cynolebias whitei the cell types responsible for the increase of pituitary growth at the onset of maturation and for pituitary hyperplasia in old specimens were identified as gonadotropic cells and thyrotropic cells, respectively. The gonadotropic cells showed a high affinity to anti-carp alpha beta-GTH serum, both at light- and electron-microscopical levels. The allometric relation of total gonadotropic cell volume to body length, determined for fish from six weeks up to six months of age, showed no inflections. Therefore pituitary growth in maturing fish may be partly a result of proliferation of gonadotropes, although gonadotropic cells do not contribute to pituitary hyperplasia in old fish. Thyrotropic cells showed a weak affinity to anti-carp alpha beta-GTH serum at light-microscopical level. Under the electron microscope thyrotropic cells displayed signs of activation in maturing fish and signs of proliferation in old fish. The allometric relation of thyroid gland volume to body length paralleled that of pituitary volume to body length. Histologically the thyroid gland showed signs of inactivity in adult fish and of hyperplasia in old fish. The possibility, that gonadal maturation, pituitary thyrotropic activity, and growth of the thyroid in maturing fish are related through the inhibitory action of gonadal steroids on thyroid hormone release, is discussed. Pituitary hyperplasia in old fish is the result of proliferation of thyrotropic cells. Similar hyperplasia of pituitary and thyroid glands was observed in old Nothobranchius korthausae.
J M Ruijter; J Peute; P J Levels
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Cell and tissue research     Volume:  248     ISSN:  0302-766X     ISO Abbreviation:  Cell Tissue Res.     Publication Date:  1987 Jun 
Date Detail:
Created Date:  1987-08-28     Completed Date:  1987-08-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417625     Medline TA:  Cell Tissue Res     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  689-97     Citation Subset:  IM    
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MeSH Terms
Cyprinidae / growth & development*
Gonadotropins / analysis
Microscopy, Electron
Pituitary Gland / cytology,  growth & development*,  ultrastructure
Species Specificity
Thyroid Gland / cytology,  growth & development*
Thyrotropin / analysis
Reg. No./Substance:
0/Gonadotropins; 9002-71-5/Thyrotropin

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