Your browser doesn't support javascript.
loading
Spaceflight engages heat shock protein and other molecular chaperone genes in tissue culture cells of Arabidopsis thaliana.
Zupanska, Agata K; Denison, Fiona C; Ferl, Robert J; Paul, Anna-Lisa.
Afiliação
  • Zupanska AK; Horticultural Science Department, Program in Plant Molecular and Cellular Biology, University of Florida, Gainesville, Florida 32611, USA.
Am J Bot ; 100(1): 235-48, 2013 Jan.
Article em En | MEDLINE | ID: mdl-23258370
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.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Voo Espacial / Genes de Plantas / Arabidopsis / Proteínas de Arabidopsis / Técnicas de Cultura de Tecidos / Proteínas de Choque Térmico Idioma: En Ano de publicação: 2013 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Voo Espacial / Genes de Plantas / Arabidopsis / Proteínas de Arabidopsis / Técnicas de Cultura de Tecidos / Proteínas de Choque Térmico Idioma: En Ano de publicação: 2013 Tipo de documento: Article