Neuropeptide FF (FLFQPQRF-NH2) and its Fragments Bind to α2δ Subunit of Voltage-Gated Calcium Channels
DOI:
https://doi.org/10.18433/jpps30358Abstract
Purpose: Gabapentin, a drug for neuropathic pain, exerts its therapeutic effect via inhibition of the a2d subunit of N-type Ca2+ channels. Thus, finding peptides that specifically displace gabapentin from its binding site may lead to the development of new drugs. Methods: Displacement of bound [3H]-gabapentin in membrane preparations of rat cerebral cortex and of human Cav2.2/β3/α2δ1 expressed in CHO cell line. Results: Neuropeptide FLFQPQRF-NH2 specifically displaced bound [3H]-gabapentin in membrane preparations from rats and CHO cells. Truncation of the C-terminus of FLFQPQRF-NH2 by three amino acid residues to produce FLFQP-NH2 improved the displacement of gabapentin. FLFQP-NH2 displaced bound [3H]-gabapentin with IC50 and Ki values of 2.7 µM and 1.7 µM, respectively. Deletion of two amino acid residues (FQ) in the middle of the FLFQP-NH2 sequence yielded FLP-NH2 that displaced bound [3H]-gabapentin with a lower affinity. IC50 and Ki values were 11.9 µM and 7.8 µM, respectively. Neutral binding cooperativity existed when of FLFQP-NH2, FLP- NH2 and gabapentin when incubated together. FLFQPQRF-NH2 but not FLFQP-NH2 displaced bound [3H]-gabapentin to membrane preparations of human Cav2.2/b3/a2d1 expressed in CHO cells. Conclusion: FLFQPQRF-NH2, FLFQP-NH2 and FLP-NH2 displace bound gabapentin in membrane preparations of rat cerebral cortex. Binding cooperativity was detected when GBP/FLFQP-NH2/FLP-NH2 were incubated together. These novel binding sites may provide new approaches to modulate L-type Ca2+ channels.Downloads
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