Characterization and Expression of Steroidogenic Acute Regulatory Protein and MLN64 cDNAs in Trout

Complementary DNA-encoding proteins with high homology to steroidogenic acute regulatory proteins (StAR) of mammals were cloned from rainbow trout head kidney and a mixture of several brook trout tissues. A cDNA encoding an MLN64 homolog was also cloned from brook trout. The C-terminal domains of ra...

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Bibliographic Details
Published in:Endocrinology (Philadelphia) 2002-06, Vol.143 (6), p.2062-2070
Main Authors: Kusakabe, Makoto, Todo, Takashi, McQuillan, H. James, Goetz, Frederick W, Young, Graham
Format: Article
Language:English
Subjects:
Abundance
Gametocytes
Gene expression
Homology
Intestine
Kidneys
Mammals
Maturation
Oncorhynchus mykiss
Ovaries
Ovulation
Proteins
Regulatory proteins
Salvelinus fontinalis
Steroidogenic acute regulatory protein
Structure-function relationships
Trout
Vertebrates
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Summary:Complementary DNA-encoding proteins with high homology to steroidogenic acute regulatory proteins (StAR) of mammals were cloned from rainbow trout head kidney and a mixture of several brook trout tissues. A cDNA encoding an MLN64 homolog was also cloned from brook trout. The C-terminal domains of rainbow trout StAR and brook trout StAR were very highly conserved compared with StAR of mammals. In rainbow trout, Northern and RT-PCR analyses showed abundant StAR transcripts in head kidney, ovary, and testis, and weaker signals were found in intestine, pyloric caeca, spleen, and kidney. Brief acute stress resulted in elevated plasma cortisol levels and a 2-fold increase in rainbow trout StAR transcripts in head kidneys sampled 3 h after exposure to the stressor. In brook trout, StAR transcripts were detected only in known steroidogenic tissues. Ovarian brook trout StAR mRNA was not seen until the onset of final maturation. Its abundance increased during germinal vesicle breakdown, peaked during and just following ovulation, and decreased by 2 wk post ovulation. Brook trout MLN64 transcripts were found in all tissues tested, and transcript abundance in ovarian samples did not vary during final oocyte maturation and ovulation. Both StAR structure and function appear to be highly conserved throughout the vertebrates.
ISSN:0013-7227
1945-7170
DOI:10.1210/endo.143.6.8672