7,8-Dihydroxyflavone potentiates ongoing epileptiform activity in mice brain slices

Area of Science:

• Neuroscience
• Pharmacology
• Molecular Biology

Background:

• Tropomyosin-receptor-kinase B (TrkB) signaling regulates neuronal functions and is a therapeutic target for neurological disorders.
• 7,8-Dihydroxyflavone (DHF) is a TrkB agonist with neuroprotective and cognitive-enhancing properties.
• The acute effects of DHF on neuronal excitability and epileptiform activity are not well understood.

Purpose of the Study:

• To investigate if DHF induces or affects epileptiform activity in brain slices.
• To determine the impact of DHF on synchronized neuronal discharges.

Main Methods:

• Acute horizontal hippocampal-entorhinal cortex slices from mice (30-35 days old) were used.
• Extracellular field potential recordings were performed in the entorhinal cortex (EC) and hippocampus CA1.
• The effects of DHF on spontaneous and 4-aminopyridine (4AP)-induced epileptiform activity were assessed.

Main Results:

• DHF did not initiate epileptiform activity on its own.
• DHF significantly increased the frequency of 4AP-induced ictal and interictal events in both EC and CA1.
• DHF prolonged the duration of ictal discharges and induced ictogenesis in some slices.

Conclusions:

• Acute activation of TrkB by DHF can powerfully enhance synchronized neuronal discharges.
• These findings suggest that TrkB activation by DHF may increase seizure risk.
• Consideration of DHF's pro-epileptiform effects is crucial for future therapeutic applications targeting the TrkB pathway.