Myristoylated alanine-rich C kinase substrate protein and mRNA in bovine corpus luteum during the estrous cycle.

Abstract:

:The bovine corpus luteum contains a myristoylated alanine-rich C kinase substrate (MARCKS) protein known to crosslink actin filaments in the cytoskeletal cortex associated with the plasma membrane. We conducted experiments to determine whether concentrations of MARCKS mRNA and protein in the bovine corpus luteum varied during the estrous cycle. Using Northern blots probed with a MARCKS cDNA, we found that luteal concentrations of MARCKS mRNA were greatest on d 4, 8, and 12 and markedly reduced on d 16 of the cycle (p < 0.08). Similarly, Western blot analysis of luteal proteins revealed that concentrations of MARCKS protein were greatest on d 8 and least on d 16 of the cycle (p < 0.01). Exposure of slices from a d 8 corpus luteum to prostaglandin F2alpha (PGF2alpha) during a 10-min incubation in the presence of [32P]-ortho-phosphate resulted in enhanced phosphorylation of MARCKS in membrane and cytosolic fractions compared to that of controls. We therefore concluded that expression of the luteal MARCKS protein gene may be regulated and that PGF2alpha-induced phosphorylation of this protein is attributable to activation of protein kinase C.

journal_name

Endocrine

journal_title

Endocrine

authors

Filley S,Supancic S,Salli U,Orwig K,Stormshak F

doi

10.1385/ENDO:12:3:289

subject

Has Abstract

pub_date

2000-06-01 00:00:00

pages

289-94

issue

3

eissn

1355-008X

issn

1559-0100

pii

ENDO:12:3:289

journal_volume

12

pub_type

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