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Extraction of Total RNA and RT-PCR Total RNA was extracted from lung and liver tissues (20mg) using RNeasy mini protection kit from QIAGEN according to the supplier¡¤s guideline .The concentration and purity of the extracted RNA were checked spectrophotometrically by mea- suring 260/280 absorption ratios.The primer pair for ASTIV was designed in our laboratory using the Gene Fishe rprimer designing and Multialign-ment software.Usingtheforwardprimer(FP)5`-GTGTCCTATGGGTCGTGGTA-3` /reverseprimer(RP)5`-TTCTGGGCTACAGTGAAGGTA-3 (GenBank acces- sion no.X52883),the299-bp AST IV cDNA was syn-thesized.The 264-bp STa cDNA was synthesized using the primer pair FP 5`-TCCTCAAAGGATATGTTCCG- 3`/RP 5`-CAGTTCCTTCTCCATGAGAT-3` (GenBank accession no.M33329).The specificity of all primers was tested using the BLAST from the National Cen-terfo rBiotechnology Information Open Reading Frame software.cDNA synthesis from total 1 ug of liverand 2 ug of lung RNA was performed in a 50 uL reaction mixture.Concentrations of the different ingredients used followed the supplier¡¤s guidelines. Forinterna control,500-bp cDNA of rat ¦Â-actin was synthesized from the same amount of RNA from respective sources. The prime rpair FP5`-GATGTACGTAGCCATCCA-3`/RP5`-GTGCCAACCAGACAGCA-3` for the synthesis of rat ¦Â-actin cDNA was designed in our laboratory using the software mentioned above. |
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