期刊
FRONTIERS IN CHEMISTRY
卷 7, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2019.00479
关键词
BDS-I; voltage gated potassium channel; KV3.4; Alzheimer's disease; Ab peptide
资金
- European Brain Research Institute (EBRI)/National Research Council of Italy (CNR)
- MIUR [PON03PE_00146_1, PON_01602]
- POR Campania FESR 2007-2013 MOVIE [B25C1300024007]
- POR Campania FESR 2007-2013 FARMABIONET [B25C1300023007]
There is increasing evidence that the fast-inactivating potassium current IA, encoded by K(V)3. 4 channels, plays an important role in Alzheimer's Disease (AD), since the neurotoxic beta-amyloid peptide1-42 (A beta(1-42)) increases the IA current triggering apoptotic processes. The specific inhibition of K(V)3.4 by the marine toxin extracted from Anemonia sulcata, named blood depressing substance-I (BDS-I), reverts the Ab peptide-induced cell death. The aim of the present study was to identify the smallest fragments of BDS-I, obtained by peptide synthesis, able to inhibit K(V)3.4 currents. For this purpose, whole-cell patch clamp technique was used to evaluate the effects of BDS-I fragments on K(V)3.4 currents in CHO cells heterologously expressing K(V)3.4. We found that BDS-I[1-8] fragment, containing the N-terminal octapeptide sequence of full length BDS-I, was able to inhibit KV3.4 currents in a concentration dependent manner, whereas the scrambled sequence of BDS-I[1-8] and all the other fragments obtained from BDS-I full length were ineffective. As we demonstrated in a previous study, BDS-I full length is able to counteract A beta(1-42)-induced enhancement of K(V)3.4 activity, preventing A beta(1-42)-induced caspase-3 activation and the abnormal nuclear morphology in NGF-differentiated PC-12 cells. Similarly to BDS-I, we found that BDS-I[1-8] blocking K(V)3.4 currents prevented A beta(1-42)-induced caspase-3 activation and apoptotic processes. Collectively, these results suggest that BDS-I[1-8] could represent a lead compound to be developed as a new drug targeting K(V)3.4 channels.
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