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Hypergravity Alters the Susceptibility of Cells to Anoxia-Reoxygenation InjuryGravity is a physical force, much like shear stress or mechanical stretch, and should affect organ and cellular function. Researchers have shown that gravity plays a role in ventilation and blood flow distribution, gas exchange, alveolar size and mechanical stresses within the lung. Short exposure to microgravity produced marked alterations in lung blood flow and ventilation distribution while hypergravity exaggerated the regional differences in lung structure and function resulting in reduced ventilation at the base and no ventilation of the upper half of the lung. Microgravity also decreased metabolic activity in cardiac cells, WI-38 embryonic lung cells, and human lymphocytes. Rats, in the tail-suspended head-down tilt model, experienced transient loss of lung water, contrary to an expected increase due to pooling of blood in the pulmonary vasculature. Hypergravity has also been found to increase the proliferation of several different cell lines (e.g., chick embryo fibroblasts) while decreasing cell motility and slowing liver regeneration following partial hepatectomy. These studies show that changes in the gravity environment will affect several aspects of organ and cellular function and produce major change in blood flow and tissue/organ perfusion. However, these past studies have not addressed whether ischemia-reperfusion injury will be exacerbated or ameliorated by changes in the gravity environment, e.g., space flight. Currently, nothing is known about how gravity will affect the susceptibility of different lung and vascular cells to this type of injury. We conducted studies that addressed the following question: Does the susceptibility of lung fibroblasts, vascular smooth muscle, and endothelial cells to anoxia/reoxygenation injury change following exposure to hypergravity conditions?
Document ID
20010000510
Document Type
Conference Paper
Authors
McCloud, Henry (Morehouse Coll. Atlanta, GA United States)
Pink, Yulondo (Morehouse School of Medicine Atlanta, GA United States)
Harris-Hooker, Sandra A. (Morehouse School of Medicine Atlanta, GA United States)
Melhado, Caroline D. (Morehouse School of Medicine Atlanta, GA United States)
Sanford, Gary L. (Morehouse School of Medicine Atlanta, GA United States)
Date Acquired
August 20, 2013
Publication Date
February 1, 1997
Publication Information
Publication: NASA University Research Centers Technical Advances in Education, Aeronautics, Space, Autonomy, Earth and Environment
Volume: 1
Subject Category
Life Sciences (General)
Report/Patent Number
URC97152
Funding Number(s)
OTHER: NCCW-85
CONTRACT_GRANT: NAG9-644
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle20010000359Analytic PrimaryNASA University Research Centers Technical Advances in Education, Aeronautics, Space, Autonomy, Earth and Environment