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Fig. 4. Effects of organic osmolytes or colchicine on Ostf mRNA expression levels
in primary gill cell culture. Primary gill cells were grown overnight in the
isotonic medium (320 mOsmol l–1) and were then subjected to
hypertonic treatment (NaCl, 500 mOsmol l–1) with the addition
of (A) either 5 mmol l–1 of inositol, betaine or taurine or
(B) 100 µmol l–1 colchicine. After 6 h of treatment, total
RNA was extracted and was reverse transcribed for real-time PCR assay. Note
that the cotreatment of the hypertonicity-exposed cells with the organic
osmolytes or colchicine abolished the induced Ostf mRNA expression.
*P<0.05 compared with the control cells. The results
were obtained from five independent experiments.