Inhibition of integrin activity in the hippocampal slices of mice cannot influence the induction of long-term potentiation, but bring rapid long-term potentiation attenuation, proving integrin plays a key role in maintaining and stabilizing the long-term potentiation after induction.OBJECTIVE:
To explain the influence of integrin beta-1 subunit during the inhibition of long-term potentiation induced by amyloid beta-protein in rat hippocampus CA1 in vivo using electrophysiological technology.METHODS:
Fifteen Sprague-Dawley rats were equally randomized into control group treated with normal saline, amyloid beta-protein group treated with amyloid beta-protein, and integrin beta-1 subunit inhibitor group treated with selective antagonist for integrin beta-1 subunit. Excitatory postsynaptic potentials were recorded from 10 minutes before amyloid beta-protein administration till 3 hours after high-frequency tetanic stimulation.RESULTS AND CONCLUSION:
In the control group, excitatory postsynaptic potentials were enhanced significantly with an increment of 30%. In the amyloid beta-protein group, excitatory postsynaptic potentials were obviously restraint within 3 hours after high-frequency tetanic stimulation and had no remarkable increase. It can be speculated by the results that integrin beta-1 subunit may be important to the long-term potentiation inhibited by amyloid beta-protein in the rat hippocampal CA1 region in vivo. The special inhibitor or antibody of integrin beta-1 subunit has the ability to stop the mediation.