Clinacanthus nutans Mitigates Neuronal Apoptosis and Ischemic Brain Damage Through Augmenting the C/EBPβ-Driven PPAR-γ Transcription.
Clinacanthus nutans Lindau (C. nutans) is a traditional herbal medicine widely used in Asian countries for treating a number of remedies including snake and insect bites, skin rashes, viral infections, and cancer. However, the underlying molecular mechanisms for its action and whether C. nutans can offer protection on stroke damage in brain remain largely unknown. In the present study, we demonstrated protective effects of C. nutans extract to ameliorate neuronal apoptotic death in the oxygen-glucose deprivation model and to reduce infarction and mitigate functional deficits in the middle cerebral artery occlusion model, either administered before or after hypoxic/ischemic insult. Using pharmacological antagonist and siRNA knockdown approaches, we demonstrated ability for C. nutans extract to protect neurons and ameliorate ischemic injury through promoting the anti-apoptotic activity of peroxisome proliferator-activated receptor-gamma (PPAR-γ), a stress-induced transcription factor. Reporter and chromatin immunoprecipitation promoter analysis further revealed C. nutans extract to selectively increase CCAAT/enhancer binding protein (C/EBP)β binding to specific C/EBP binding site (-332~-325) on the PPAR-γ promoter to augment its transcription. In summary, we report a novel transcriptional activation involving C/EBPβ upregulation of PPAR-γ expression to suppress ischemic neuronal apoptosis and brain infarct. Recognition of C. nutans to enhance the C/EBPβ → PPAR-γ neuroprotective signaling pathway paves a new way for future drug development for prevention and treatment of ischemic stroke and other neurodegenerative diseases.
['Wu|Jui-Sheng|JS|', 'Kao|Mei-Han|MH|', 'Tsai|Hsin-Da|HD|', 'Cheung|Wai-Mui|WM|', 'Chen|Jin-Jer|JJ|', 'Ong|Wei-Yi|WY|', 'Sun|Grace Y|GY|', 'Lin|Teng-Nan|TN|http://orcid.org/0000-0002-4009-0798']
D027901:Acanthaceae D000818:Animals D017209:Apoptosis D002545:Brain Ischemia D022782:CCAAT-Enhancer-Binding Protein-beta D002478:Cells, Cultured D007274:Injections, Intraperitoneal D008297:Male D008807:Mice, Inbred BALB C D009474:Neurons D047495:PPAR gamma D010936:Plant Extracts D051381:Rats D014158:Transcription, Genetic
Apoptosis Ischemic stroke Gene regulation Medicinal plant