Title : Thyrotropin regulates c-Jun N-terminal kinase (JNK) activity through two distinct signal pathways in human thyroid cells.

Pub. Date : 1999 Apr

PMID : 10098509






12 Functional Relationships(s)
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1 We investigated whether and how TSH, which promotes the proliferation and differentiation of thyroid cells, regulates JNK activity in primary cultured human thyroid cells. Thyrotropin mitogen-activated protein kinase 8 Homo sapiens
2 TSH stimulated JNK activity in cytosolic fractions of thyroid cells measured by in vitro kinase assay. Thyrotropin mitogen-activated protein kinase 8 Homo sapiens
3 A low concentration of TSH (10(-11) M) stimulated JNK activity but at a higher dose (10(-8)-10(-7) M), TSH suppressed JNK activity without any change of JNK protein level. Thyrotropin mitogen-activated protein kinase 8 Homo sapiens
4 A low concentration of TSH (10(-11) M) stimulated JNK activity but at a higher dose (10(-8)-10(-7) M), TSH suppressed JNK activity without any change of JNK protein level. Thyrotropin mitogen-activated protein kinase 8 Homo sapiens
5 A low concentration of TSH (10(-11) M) stimulated JNK activity but at a higher dose (10(-8)-10(-7) M), TSH suppressed JNK activity without any change of JNK protein level. Thyrotropin mitogen-activated protein kinase 8 Homo sapiens
6 A low concentration of TSH (10(-11) M) stimulated JNK activity but at a higher dose (10(-8)-10(-7) M), TSH suppressed JNK activity without any change of JNK protein level. Thyrotropin mitogen-activated protein kinase 8 Homo sapiens
7 A low concentration of TSH (10(-11) M) stimulated JNK activity but at a higher dose (10(-8)-10(-7) M), TSH suppressed JNK activity without any change of JNK protein level. Thyrotropin mitogen-activated protein kinase 8 Homo sapiens
8 We next elucidated the signal transduction pathways in TSH-induced JNK activation by examining the involvement of four distinct intracellular signal molecules; protein kinase C (PKC), cAMP, Ca2+, and PI3-kinase. Thyrotropin mitogen-activated protein kinase 8 Homo sapiens
9 We next elucidated the signal transduction pathways in TSH-induced JNK activation by examining the involvement of four distinct intracellular signal molecules; protein kinase C (PKC), cAMP, Ca2+, and PI3-kinase. Cyclic AMP mitogen-activated protein kinase 8 Homo sapiens
10 The stimulation of JNK by TSH was blocked by two PKC inhibitors and suppressed by 8-bromo-cAMP or forskolin. 8-Bromo Cyclic Adenosine Monophosphate mitogen-activated protein kinase 8 Homo sapiens
11 The stimulation of JNK by TSH was blocked by two PKC inhibitors and suppressed by 8-bromo-cAMP or forskolin. Colforsin mitogen-activated protein kinase 8 Homo sapiens
12 These findings demonstrate that TSH regulates JNK activity biphasically in human thyroid cells through an interaction between Gi-PKC and cAMP-PKA pathways. Cyclic AMP mitogen-activated protein kinase 8 Homo sapiens