Shear Forces During Blast, Not Abrupt Changes in Pressure Alone, Generate Calcium Activity in Human Brain Cells

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2012 Jul 7

PMID 22768078

Citations 24

Authors

Rea Ravin

Paul S Blank

Alex Steinkamp

Shay M Rappaport

Nitay Ravin

Ludmila Bezrukov

Hugo Guerrero-Cazares

Alfredo Quinones-Hinojosa

Sergey M Bezrukov

Joshua Zimmerberg

Affiliations

Soon will be listed here.

Abstract

Blast-Induced Traumatic Brain Injury (bTBI) describes a spectrum of injuries caused by an explosive force that results in changes in brain function. The mechanism responsible for primary bTBI following a blast shockwave remains unknown. We have developed a pneumatic device that delivers shockwaves, similar to those known to induce bTBI, within a chamber optimal for fluorescence microscopy. Abrupt changes in pressure can be created with and without the presence of shear forces at the surface of cells. In primary cultures of human central nervous system cells, the cellular calcium response to shockwaves alone was negligible. Even when the applied pressure reached 15 atm, there was no damage or excitation, unless concomitant shear forces, peaking between 0.3 to 0.7 Pa, were present at the cell surface. The probability of cellular injury in response to a shockwave was low and cell survival was unaffected 20 hours after shockwave exposure.

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