A series of polymethyl-substituted piperidines linked to either a 6-methoxy-1,2,3,4-tetrahydronaphthalen-1-yl or a 6-methoxynaphthalen-1-yl moiety was generated with the aim of verifying a previously generated hypothesis: tetralin and naphthalene nuclei confer opposite activity at the σ1 receptor. Compounds 6, 9 and 10 displayed appreciable affinity at both σ subtypes, but none of the novel compounds displayed significant antiproliferative activity in MCF7wt and MCF7σ1 cell lines. The effect on bradikynin-triggered Ca(2+) mobilization was studied as a methodology to suggest σ receptors mediated activity.
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