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F281, synthetic agonist of the sigma-2 receptor, induces Ca2+ efflux from the endoplasmic reticulum and mitochondria in SK-N-SH cells

Cassano, Giuseppe, Gasparre, Giuseppe, Niso, Mauro, Contino, Marialessandra, Scalera, Vito, Colabufo, Nicola Antonio·2009·Cell Calcium
DOI 10.1016/j.ceca.2008.12.005
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Abstract

We demonstrate that F281, a synthetic agonist of the sigma-2 receptor (s2R), induces a non transient increase in intracellular [Ca(2+)] ([Ca(2+)](i)) and cell death in SK-N-SH cells. Sigma receptors are classified into two subtypes, with different molecular weight and tissue distribution. While the sigma-1 receptor has been cloned, the s2r is less characterized and its physiological ligand and role need further investigation. In tumour cell lines, synthetic agonists of the s2R trigger apoptosis and modulate [Ca(2+)](i). In particular, CB-64D induces a Ca(2+) response while PB28 supresses Ca(2+) signalling. We have recently synthesized F281, by replacing the 5-methoxytetraline moiety of PB28 with a carbazole nucleus. Although this bioisosteric substitution should not affect the ligand affinity at the receptor, F281 (after 24h incubation) was more cytotoxic than PB28 (EC(50) values 65.4nM and 8.13 microM, respectively) in SK-N-SH cells. We used the fluorescent probes fura-2, rhod-2 and JC-1. F281 mobilizes Ca(2+) from mitochondria and from the endoplasmic reticulum, by opening its inositol 1,4,5-trisphosphate receptor; Ca(2+)-entry through the channels activated by store depletion was also observed. After the increase in [Ca(2+)](i) and within 10 min, we observed a sudden drop in metabolic activity and intracellular [ATP] leading to cell death.

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Research works printed but not linked: 34

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Metadata

Authors
Cassano, G., Gasparre, G., Niso, M., Contino, M., Scalera, V., & Colabufo, N. A.
Venue
Cell Calcium
Publisher
Elsevier BV
Published
2009-04
Volume
45
Issue
4
Pages
340-345
ISSN
0143-4160
DOI
10.1016/j.ceca.2008.12.005
Cited by
51
References
0
Language
en
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