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Spaceflight engages heat shock protein and other molecular chaperone genes in tissue culture cells of Arabidopsis thaliana.

Abstract：

PREMISE OF THE STUDY:Gravity has been a major force throughout the evolution of terrestrial organisms, and plants have developed exquisitely sensitive, regulated tropisms and growth patterns that are based on the gravity vector. The nullified gravity during spaceflight allows direct assessment of gravity roles. The microgravity environments provided by the Space Shuttle and International Space Station have made it possible to seek novel insights into gravity perception at the organismal, tissue, and cellular levels. Cell cultures of Arabidopsis thaliana perceive and respond to spaceflight, even though they lack the specialized cell structures normally associated with gravity perception in intact plants; in particular, genes for a specific subset of heat shock proteins (HSPs) and factors (HSFs) are induced. Here we ask if similar changes in HSP gene expression occur during nonspaceflight changes in gravity stimulation. METHODS:Quantitative RT-qPCR was used to evaluate mRNA levels for Hsp17.6A and Hsp101 in cell cultures exposed to four conditions: spaceflight (mission STS-131), hypergravity (centrifugation at 3 g or 16 g), sustained two-dimensional clinorotation, and transient milligravity achieved on parabolic flights. KEY RESULTS:We showed that HSP genes were induced in cells only in response to sustained clinorotation. Transient microgravity intervals in parabolic flight and various hypergravity conditions failed to induce HSP genes. CONCLUSIONS:We conclude that nondifferentiated cells do indeed sense their gravity environment and HSP genes are induced only in response to prolonged microgravity or simulated microgravity conditions. We hypothesize that HSP induction upon microgravity indicates a role for HSP-related proteins in maintaining cytoskeletal architecture and cell shape signaling.

journal_name

Am J Bot

journal_title

American journal of botany

authors

Zupanska AK,Denison FC,Ferl RJ,Paul AL

doi

10.3732/ajb.1200343

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

235-48

issue

eissn

0002-9122

issn

1537-2197

pii

ajb.1200343

journal_volume

100

pub_type

杂志文章

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Spaceflight engages heat shock protein and other molecular chaperone genes in tissue culture cells of Arabidopsis thaliana.