Thyrotropin Activates Mitogen-Activated Protein Kinase Pathway in FRTL-5 by a cAMP-Dependent Protein Kinase A-Independent Mechanism

2001 ◽  
Vol 60 (5) ◽  
pp. 924-933 ◽  
Author(s):  
Luisa Iacovelli ◽  
Loredana Capobianco ◽  
Lorena Salvatore ◽  
Michele Sallese ◽  
Gabriel Maximo D'Ancona ◽  
...  
Keyword(s):  
Protein Kinase ◽  
Protein Kinase A ◽  
Mitogen Activated Protein Kinase ◽  
Dependent Protein Kinase ◽  
Camp Dependent Protein Kinase ◽  
Independent Mechanism ◽  
Mitogen Activated Protein ◽  
Dependent Protein ◽  
Kinase Pathway ◽  
Kinase A

Regulation of spontaneous and induced resumption of meiosis in mouse oocytes by different intracellular pathways

Reproduction ◽  
2000 ◽  
pp. 377-383 ◽  
Author(s):  
L Leonardsen ◽  
A Wiersma ◽  
M Baltsen ◽  
AG Byskov ◽  
CY Andersen
Keyword(s):  
Signal Transduction ◽  
Protein Kinase ◽  
Protein Kinase A ◽  
Mitogen Activated Protein Kinase ◽  
Meiotic Maturation ◽  
Mouse Oocytes ◽  
Mitogen Activated Protein ◽  
Dependent Signal ◽  
Kinase Pathway ◽  
Kinase A

The mitogen-activated protein kinase-dependent and the cAMP-protein kinase A-dependent signal transduction pathways were studied in cultured mouse oocytes during induced and spontaneous meiotic maturation. The role of the mitogen-activated protein kinase pathway was assessed using PD98059, which specifically inhibits mitogen-activated protein kinase 1 and 2 (that is, MEK1 and MEK2), which activates mitogen-activated protein kinase. The cAMP-dependent protein kinase was studied by treating oocytes with the protein kinase A inhibitor rp-cAMP. Inhibition of the mitogen-activated protein kinase pathway by PD98059 (25 micromol l(-1)) selectively inhibited the stimulatory effect on meiotic maturation by FSH and meiosis-activating sterol (that is, 4,4-dimethyl-5alpha-cholest-8,14, 24-triene-3beta-ol) in the presence of 4 mmol hypoxanthine l(-1), whereas spontaneous maturation in the absence of hypoxanthine was unaffected. This finding indicates that different signal transduction mechanisms are involved in induced and spontaneous maturation. The protein kinase A inhibitor rp-cAMP induced meiotic maturation in the presence of 4 mmol hypoxanthine l(-1), an effect that was additive to the maturation-promoting effect of FSH and meiosis-activating sterol, indicating that induced maturation also uses the cAMP-protein kinase A-dependent signal transduction pathway. In conclusion, induced and spontaneous maturation of mouse oocytes appear to use different signal transduction pathways.

cAMP-Dependent Protein Kinase A-Stimulated Sarcoplasmic Reticulum Function in Heart Failurea

1998 ◽  
Vol 853 (1 CARDIAC SARCO) ◽  
pp. 240-250 ◽  
Author(s):  
ROBERT H. G. SCHWINGER ◽  
BIRGIT BOLCK ◽  
GOTZ MUNCH ◽  
KLARA BRIXIUS ◽  
JOCHEN MULLER-EHMSEN ◽  
...  
Keyword(s):  
Protein Kinase ◽  
Sarcoplasmic Reticulum ◽  
Protein Kinase A ◽  
Dependent Protein Kinase ◽  
Camp Dependent Protein Kinase ◽  
Dependent Protein ◽  
Kinase A
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