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Temporal lobe epilepsy (TLE) is the most common form of drug-resistant epilepsy. Blood–brain barrier (BBB) leakage occurs during epileptogenesis and several pieces of evidence suggest that this might contribute to the progression of epilepsy. Seizures trigger a pathway involving glutamate signalling through cytosolic phospholipase A2 (cPLA2). This pathway leads to BBB leakage and induces the expression of drug efflux transporters, leading to drug resistance. Therefore, this study aims to determine the mRNA and protein levels of cPLA2, along with its functional activity, in the hippocampus of pilocarpine model of TLE as well as in the surgically resected hippocampal samples of patients with TLE. mRNA levels and protein levels of cPLA2 were evaluated by real-time PCR and western blot analysis respectively in animal model of TLE as well as surgically resected hippocampal tissue specimens of TLE. cPLA2 functional activity was measured spectrophotometrically. Significant up-regulation of cPLA2 mRNA was observed in the hippocampal samples obtained from TLE rats (p &lt; 0.05) and-TLE patients (p &lt; 0.01). Increased protein expression of cPLA2 was also demonstrated in the hippocampal samples of TLE rats (p &lt; 0.01) as well as TLE patients (p &lt; 0.01). Similarly, functional activity of cPLA2 was found to be up-regulated in the hippocampus of pilocarpine model of TLE rats (p &lt; 0.01) as well as in the TLE patients (p &lt; 0.01). These findings suggest that alterations in cPLA2 expression and activity level in the hippocampus could potentially be a part of dynamic changes associated with TLE.

Altered hippocampal expression and function of cytosolic phospholipase A2 (cPLA2) in temporal lobe epilepsy (TLE)