Cortical spreading depression decreases Fos expression in rat periaqueductal gray matter.

The migraine headache involves activation and central sensitization of the trigeminovascular pain pathway. The migraine aura is likely due to cortical spreading depression (CSD), a propagating wave of brief neuronal depolarization followed by prolonged inhibition. The precise link between CSD and headache remains controversial.

Modulation of protein tyrosine phosphorylation in gastric mucosa during re-epithelization processes.

Aim: To investigate the role of protein tyrosine phosphorylation in gastric wound formation and repair following ulceration.

Methods: Gastric lesions were induced in rats using restraint cold stress. To investigate the effect of oxidative and nitrosative cell stress on tyrosine phosphorylation during wound repair, total activity of protein tyrosine kinase (PTK), protein tyrosine phosphatase (PTP), antioxidant enzymes, nitric oxide synthase (NOS), 2',5'-oligoadenylate synthetase, hydroxyl radical and zinc levels were assayed in parallel.