Stimulatory Role of Low viscous Sodium Alginate Extracted from Turbinaria decurrens (Phaeophyta) on Immune Responses and Gene Expression in Litopenaeus vannamei - Abstract
This study assessed the stimulatory role of supplementation of low viscous sodium alginate extracted from Turbinaria decurrens (Phaeophyta) on the immune response of the white shrimp Litopenaeus vannamei. The total haemocytes count, phenoloxidase activity, respiratory burst and lysozyme activity of shrimp fed with diets containing sodium alginate was significantly higher than that of control (without sodium alginate). An increase in resistance against V. parahaemolyticus was observed in shrimps under laboratory conditions. An enhanced activity of ?GBP, PE, proPO, cyt-SOD, PA-5 and SWDP mRNA transcriptions was observed in shrimps when fed with sodium alginate. In addition to that, expression fold of PE, pro PO and SWDP was higher with low viscous sodium alginate when compared to higher viscous sodium alginate. Our results suggest that low viscous sodium alginate supplementation plays a significant role in the immune responses and gene expression in Litopenaeus vannamei.