A rapid and reliable flow cytometric method for determining Hsp70 levels in tobacco protoplasts |
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Authors: | Marianne J Cronjé Marisha Snyman Liza Bornman Iona E Weir |
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Affiliation: | (1) Biochemistry Division, Department of Chemistry and Biochemistry, RAU University, P. O. Box 524, Auckland Park, South Africa;(2) BioDiscovery NZ Ltd, 24 Balfour Road, Parnell, Auckland, New Zealand;(3) Biochemistry Division, Department of Chemistry and Biochemistry, RAU University, P. O. Box 524, Auckland Park, South Africa |
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Abstract: | Current methods to determine heat shock protein (Hsp) synthesis or accumulation in plant cells, such as Western blotting and biomet abolic labelling are either indirectly quantitative, labour-intensive or biohazardous. An optimal flow cytometric protocol was developed to measure the intracellular Hsp70/Hsc70 levels in tobacco protoplasts. After heat treatments, protoplasts were fixed in 2% paraformal dehyde-phosphate-buffered saline and dehydrated overnight in methyl cellusolveTM, followed by permeabilization with Triton X-100 (0. 1% in Protoplast Wash Fluid). Immunolabelling of Hsp70/Hsc70 was done for 1 hour with a mouse monoclonal antibody and detected by;R-Phycoerythrin-conjugated goat anti-mouse IgG using flow cytometry. Flow cytometry detected a significant 1. 2-fold increase in Hsp70/Hsc70 accumulation (P < 0. 001) in protoplasts, while Western blotting, quantified by image anal ysis, showed induction under similar conditions but at lower significance (P < 0. 05). The coefficients of variance for flow cytometry and Western blotting were 30. 7 and 49. 8 respectively. Optimum temperature of heat-induced Hsp70/Hsc70 accumulation in tobacco protoplasts occurred at 40 °C. Flow cytometry is proposed as a quantitative, more reproducible and rapid alternative to Western blotting for the detection of Hsp70 accumulation in plant cells. |
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Keywords: | Flow cytometry Heat shock proteins Hsp70/Hsc70 Protoplasts Tobacco |
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