Document Detail

A new experimental system for the extended application of cyclic hydrostatic pressure to cell culture.
MedLine Citation:
PMID:  17227105     Owner:  NLM     Status:  MEDLINE    
Mechanical forces have been shown to be important stimuli for the determination and maintenance of cellular phenotype and function. Many cells are constantly exposed in vivo to cyclic pressure, shear stress, and/or strain. Therefore, the ability to study the effects of these stimuli in vitro is important for understanding how they contribute to both normal and pathologic states. While there exist commercial as well as custom-built devices for the extended application of cyclic strain and shear stress, very few cyclic pressure systems have been reported to apply stimulation longer than 48 h. However, pertinent responses of cells to mechanical stimulation may occur later than this. To address this limitation, we have designed a new cyclic hydrostatic pressure system based upon the following design variables: minimal size, stability of pressure and humidity, maximal accessibility, and versatility. Computational fluid dynamics (CFD) was utilized to predict the pressure and potential shear stress within the chamber during the first half of a 1.0 Hz duty cycle. To biologically validate our system, we tested the response of bone marrow progenitor cells (BMPCs) from Sprague Dawley rats to a cyclic pressure stimulation of 120/80 mm Hg, 1.0 Hz for 7 days. Cellular morphology was measured using Scion Image, and cellular proliferation was measured by counting nuclei in ten fields of view. CFD results showed a constant pressure across the length of the chamber and no shear stress developed at the base of the chamber where the cells are cultured. BMPCs from Sprague Dawley rats demonstrated a significant change in morphology versus controls by reducing their size and adopting a more rounded morphology. Furthermore, these cells increased their proliferation under cyclic hydrostatic pressure. We have demonstrated that our system imparts a single mechanical stimulus of cyclic hydrostatic pressure and is capable of at least 7 days of continuous operation without affecting cellular viability. Furthermore, we have shown for the first time that BMPCs respond to cyclic hydrostatic pressure by alterations in morphology and increased proliferation.
Timothy M Maul; Douglas W Hamilton; Alejandro Nieponice; Lorenzo Soletti; David A Vorp
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of biomechanical engineering     Volume:  129     ISSN:  0148-0731     ISO Abbreviation:  J Biomech Eng     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-01-17     Completed Date:  2007-07-11     Revised Date:  2014-09-18    
Medline Journal Info:
Nlm Unique ID:  7909584     Medline TA:  J Biomech Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  110-6     Citation Subset:  IM    
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MeSH Terms
Cell Culture Techniques / instrumentation*,  methods
Cells, Cultured
Equipment Design
Equipment Failure Analysis
Mechanotransduction, Cellular / physiology*
Mesenchymal Stromal Cells / cytology,  physiology*
Microfluidic Analytical Techniques / instrumentation*,  methods
Physical Stimulation / instrumentation*,  methods
Rats, Sprague-Dawley
Grant Support
5F31EB004791-2/EB/NIBIB NIH HHS; R01 HL069368/HL/NHLBI NIH HHS; R01 HL069368/HL/NHLBI NIH HHS; R01 HL069368-02/HL/NHLBI NIH HHS; R01 HL069368-03/HL/NHLBI NIH HHS; R01 HL069368-04/HL/NHLBI NIH HHS; T32EB001026/EB/NIBIB NIH HHS

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