TITLE

Secretory proteins characteristic of environmental changes in cellular signal transduction: Expression in oral fluid

AUTHOR(S)
Mednieks, M. I.; Burke, J. C.; Sivakumar, T. P.; Hand, A. R.; Grindeland, R. E.
PUB. DATE
January 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 504 Issue 1, p218
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Past studies have shown that both hypo- and hyper-gravity have significant consequences on a variety of tissues and organ systems. It is not known if the effects of environmental stimuli such as altered gravity are beneficial or detrimental, and if the effects can be prevented or reversed. Animal experiments from the Space Lab and Cosmos missions indicate that events that are mediated by cyclic AMP, such as cellular responses to catecholamine and peptide hormone action, are significantly altered in a number of tissues as a consequence of space flight. A secretory cyclic AMP-receptor protein (cARP), is present in saliva, and can serve as an indicator of individual responses to physiologic and environmental stress. Animal experiments have shown that the hypergravity component of space flight is a significant stress factor. In humans, cARP levels in each individual are constant under normal conditions, but elevated after acute stress. Additionally, the levels of cARP in secreted saliva can be compared to those in gingival crevicular fluid (GCF), which reflects the protein composition of serum. The ratio of cARP in saliva to that in GCF can be used as a measure of basal compared to hyper-or hypo-gravity values. An ultimate goal is to test hyper and zero G responses in human saliva to determine if cARP is a suitable index of acute and chronic stress. A miniaturized test kit for saliva collection has been designed. Samples can be collected and stored till analyses are carried out that will distinguish the effects of increased gravity from those of one and zero G. Such tests can serve as an individualized monitoring system for physiologic responses either in space or on earth. © 2000 American Institute of Physics.
ACCESSION #
5985150

 

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