Nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF) and low-affinity nerve growth factor receptor (LNGFR) mRNA levels in cultured rat Schwann cells; differential time- and dose-dependent regulation by cAMP.
Steady-state mRNA levels for NGF, BDNF, and NT-3, and their receptors, LNGFR, trk, trkB, and trkC, were examined in cultured rat Schwann cells. NGF, BDNF, and LNGFR mRNAs were expressed in control Schwann cells, but NT-3, trk, trkB and trkC mRNAs were not. As previously reported, when Schwann cells were treated with forskolin or 8-bromo-cAMP, NGF mRNA expression was enhanced, while BDNF and LNGFR mRNA levels were suppressed. The optimal concentration of forskolin for NGF mRNA enhancement and BDNF mRNA suppression was similar to that for LNGFR mRNA suppression, which coincided with the optimal concentration for Schwann cells to differentiate. However, the lag-time for forskolin-induces down-regulation of LNGFR mRNA was far greater than that for NGF mRNA increase and BDNF mRNA suppression.
Yamamoto
M
M
Fourth Department of Internal Medicine, Aichi Medical University, Japan.
Sobue
G
G
Li
M
M
Arakawa
Y
Y
Mitsuma
T
T
Kimata
K
K
D015124:8-Bromo Cyclic Adenosine Monophosphate / Q000494:pharmacology; D000818:Animals; D019208:Brain-Derived Neurotrophic Factor; D002478:Cells, Cultured; D005576:Colforsin / Q000494:pharmacology; D000242:Cyclic AMP / Q000502:physiology*; D004305:Dose-Response Relationship, Drug; D005786:Gene Expression Regulation / Q000187:drug effects*; D009414:Nerve Growth Factors / Q000096:biosynthesis / Q000235:genetics*; D009419:Nerve Tissue Proteins / Q000096:biosynthesis / Q000235:genetics*; D011518:Proto-Oncogene Proteins / Q000096:biosynthesis / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D020917:Receptor, trkA; D017475:Receptors, Nerve Growth Factor / Q000096:biosynthesis / Q000235:genetics*; D017981:Receptors, Neurotransmitter / Q000096:biosynthesis / Q000235:genetics*; D018039:Receptors, Tachykinin; D012583:Schwann Cells / Q000378:metabolism*; D015290:Second Messenger Systems / Q000187:drug effects*
D019208:Brain-Derived Neurotrophic Factor; D009414:Nerve Growth Factors; D009419:Nerve Tissue Proteins; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D017475:Receptors, Nerve Growth Factor; D017981:Receptors, Neurotransmitter; D018039:Receptors, Tachykinin; D005576:Colforsin; D015124:8-Bromo Cyclic Adenosine Monophosphate; D000242:Cyclic AMP; D020917:Receptor, trkA