The effect of dietary supplementation of Nigella sativa (black seeds) on cell mediated immunological function of male Wistar rats

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Abstract This experiment aimed to investigate the effect of dietary Nigella sativa on cell mediated immune response. A total of eighteen male Wistar rats were divided equally into control and black seeds at 30 and 50 g/kg/diet (Sa30 and Sa50), respectively for 30 days. Weight gain, feed intake, feed conversion ratio (FCR), cell mediated immune response was monitored after injection of 0.1 mL of 10% phytohemagglutinin (PHA). Intumesce Index, serum total antioxidant capacity (TAC), Catalase (CAT), Interleukin-12 (IL-12), gamma interferon (γ-IF) and tumor necrosis factor alpha (TNF-α) were determined. Histopathological examination and immunohistochemistry of splenic caspase-3 and CD 8 were done. Nigella sativa significantly (p<0.05) improved weight gain and FCR in Sa30 and Sa50 groups. Significant increase for Intumesce Index in Sa50 group was observed. Total TAC, CAT, IL-12, γ-IF and TNF-αincreased significantly (P<0.05) in Sa30 and Sa50 groups. Histological examination of PHA stimulated foot pads showed more leukocytes infiltration and edema in a dose dependent pattern. Splenic caspase-3 and CD 8 showed significant (P<0.05) decrease and increase, respectively in Sa30 and Sa50 groups. Nigella sativa seeds had immunostimulatory ability through their antioxidant potential, cytokines induction, CD 8 promotion and reducing splenic apoptosis.

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