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Bicknell, A.B. et al.

Bicknell, Lomthaisong, Woods, Hutchinson, Bennett, Gladwell, Lowry,

Characterization of a serine protease that cleaves pro-gamma-melanotropin at the adrenal to stimulate growth.

The adrenal gland requires stimuli from peptides derived from the ACTH precursor, pro-opiomelanocortin ( POMC), to maintain its tonic state. Studies have proposed that a specific postsecretional cleavage of the nonmitogenic N-terminal 16 kDa fragment, also known as pro-gamma-melanotropin (pro-gamma-MSH), is required, releasing shorter fragments that promote adrenal growth. Here, we provide evidence for this hypothesis by the cloning and characterization of a serine protease that is upregulated during growth of the adrenal cortex. It is expressed exclusively in the outer adrenal cortex, the site of cell proliferation, and in the Y1 adrenal cell line. We also show that it is required for growth of Y1 cells, remains bound to the cell surface, and cleaves its substrate, pro-gamma-MSH, at a specific bond.[1]

References

Characterization of a serine protease that cleaves pro-gamma-melanotropin at the adrenal to stimulate growth. Bicknell, A.B., Lomthaisong, K., Woods, R.J., Hutchinson, E.G., Bennett, H.P., Gladwell, R.T., Lowry, P.J. Cell (2001) [Pubmed]

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