Protein kinase A contributes to sciatic ligation-associated early activation of cyclic AMP response element binding protein in the rat spinal dorsal horn.
We examined whether early injury-associated activation of cyclic AMP response element binding protein (CREB) in the spinal dorsal horn was mediated by the cyclic AMP-dependent protein kinase A (PKA) pathway. Significant increases in the levels of phosphorylated CREB (pCREB), phosphorylated PKAIIalpha regulatory subunit (pPKA), and PKAalpha catalytic subunit (PKAalpha cat) were elicited 2 h after loose ligation of the sciatic nerve. These injury-elicited increases were significantly reduced by dorsal horn application of the cell-permeable PKA inhibitor Rp-8-Br-cAMPS. The cell-permeable PKA activator Sp-8-Br-cAMPS significantly increased the levels of pCREB, pPKA and PKAalpha cat 2 h after application onto the dorsal horn of control, uninjured animals. Our data lent further support to the notion that activation of PKA may play an important role in the early stages of nerve injury-elicited plasticity in the dorsal horn.
Miletic
Gordana
G
Department of Comparative Biosciences, University of Wisconsin, 2015 Linden Drive, Madison, WI 53706-1102, USA.
Hanson
Eric N
EN
Savagian
Caitlin A
CA
Miletic
Vjekoslav
V
D015124:8-Bromo Cyclic Adenosine Monophosphate / Q000031:analogs & derivatives* / Q000494:pharmacology; D000818:Animals; D015153:Blotting, Western / Q000379:methods; D020134:Catalytic Domain / Q000502:physiology; D017362:Cyclic AMP Response Element-Binding Protein / Q000378:metabolism*; D017868:Cyclic AMP-Dependent Protein Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D007796:Laminectomy / Q000379:methods; D008026:Ligation / Q000379:methods; D008297:Male; D010766:Phosphorylation; D020671:Posterior Horn Cells / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012584:Sciatic Nerve / Q000293:injuries*; D013116:Spinal Cord / Q000166:cytology*; D013873:Thionucleotides / Q000494:pharmacology
C105593:8-bromoadenosine-3',5'-cyclic monophosphorothioate; D017362:Cyclic AMP Response Element-Binding Protein; D013873:Thionucleotides; D015124:8-Bromo Cyclic Adenosine Monophosphate; D017868:Cyclic AMP-Dependent Protein Kinases