Effects of A Voltage Sensitive Calcium Channel Blocker and A Sodium-Calcium Exchanger Inhibitor on Apoptosis of Motor Neurons in Adult Spinal Cord Slices

(Pages: 171-176)
Hamid Reza Momeni, Ph.D., *Mahsa Jarahzadeh, M.Sc.,
* Corresponding Address: P.O.Box: 38156-8-8349 Department of Biology Faculty of Sciences Arak University Arak Iran Email:h-momeni@araku.ac.ir
Any use, distribution, reproduction or abstract of this publication in any medium, with the exception of commercial purposes, is permitted provided the original work is properly cited This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Momeni Hamid Reza, Jarahzadeh Mahsa. Effects of A Voltage Sensitive Calcium Channel Blocker and A Sodium-Calcium Exchanger Inhibitor on Apoptosis of Motor Neurons in Adult Spinal Cord Slices. Cell J. 2012; 14(3): 171-176.

Abstract

Objective:

The apoptosis of motor neurons is a critical phenomenon in spinal cord injuries. Adult spinal cord slices were used to investigate whether voltage sensitive calcium channels and Na+/Ca2+ exchangers play a role in the apoptosis of motor neurons.

Materials and Methods:

In this experimental research, the thoracic region of the adult mouse spinal cord was sliced using a tissue chopper and the slices were incubated in a culture medium in the presence or absence of N/L type voltage sensitive calcium channels blocker (loperamide, 100 µM) or Na+/Ca2+ exchangers inhibitor(bepridil, 20 µM) for 6 hours. 3-(4, 5-dimethylthiazol-2-yl)-2, 5 diphenyl tetrazolium (MTT) staining was used to assess slice viability while morphological features of apoptosis in motor neurons were studied using fluorescent staining.

Results:

After 6 hours in culture, loperamideand bepridil not only increased slice viability, but also prevented motor neuron apoptosis and significantly increased the percentage of viable motor neurons in the ventral horns of the spinal cord.

Conclusion:

The results of this study suggest that voltage sensitive calcium channels and Na+/Ca2+ exchanger might be involved in the apoptosis of motor neurons in adult spinal cord slices.