Tricyclic antidepressant amitriptyline attenuates Ca<sup>2+</sup> responses in rat peritoneal macrophages

Author:

Milenina L. S.1,Krutetskaya Z. I.1,Antonov V. G.2,Krutetskaya N. I.1

Affiliation:

1. St. Petersburg State University

2. St. Petersburg State Pediatric Medical University

Abstract

Amitriptyline is a tricyclic antidepressant widely used in clinical practice for the treatment of anxiety, depression and chronic pain. These drugs have a multifaceted effect on cellular processes. One of their targets is sigma-1 receptors. Sigma-1 receptors are molecular chaperones located in endoplasmic reticulum membrane; they are characterized by a unique structure and pharmacological profile. Sigma-1 receptors regulate many cellular processes in health and disease, including Ca2+ signaling. Using Fura-2AM microfluorimetry, it was shown for the first time that sigma-1 receptor agonist, antidepressant amitriptyline, significantly suppresses both Ca2+ mobilization from intracellular Ca2+-stores and subsequent store-dependent Ca2+ entry into cells, induced by endoplasmic Ca2+-ATPase inhibitors thapsigargin and cyclopiazonic acid, as well as disulfide-containing immunomodulators glutoxim and molixan, in rat peritoneal macrophages. The results suggest the involvement of sigma-1 receptors in a complex signaling cascade induced by glutoxim or molixan, leading to an increase of intracellular Ca2+ concentration in macrophages. The results also indicate the participation of sigma-1 receptors in the regulation of store-dependent Ca2+ entry in macrophages.

Publisher

The Russian Academy of Sciences

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