A Das

Publications (3)7.4 Total impact

• Article: Cavernous haemangioma in cultured olive barb, Puntius sarana (Hamilton).

  P K Sahoo, B R Mohanty, A Das, K D Mahapatra, J N Saha
  Journal of Fish Diseases 05/2012; 35(9):695-7. · 2.00 Impact Factor
• Article: Pathophysiology of experimental Aeromonas hydrophila infection in Puntius sarana: early changes in blood and aspects of the innate immune-related gene expression in survivors.

  A Das, P K Sahoo, B R Mohanty, J K Jena
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  ABSTRACT: A decline in production of Puntius sarana worldwide and subsequent intensification of its culture as a measure for conservation and increase food fish production have led to emergence of diseases. Investigations on innate immunological changes in fish that survives an acute bacterial infection are a few or lacking. An attempt was made to study the detailed changes in innate immune responses in P. sarana following an intraperitoneal challenge with Aeromonas hydrophila at 2.24 × 10(7)colony-forming unit (CFU)/fish. Sequential changes in transcription of immune related genes in liver and kidney, innate immune status, haematological profile and histopathology of major organs were studied after different time intervals post-challenge in the survivors. A significant increase in serum myeloperoxidase, ceruloplasmin activities and total leucocyte count, and decline in alternative complement activity were observed at early infection periods. A significant decline in plasma glucose level, total erythrocyte count, haemoglobin content and packed cell volume in blood was noticed after challenge. Superoxide radical production and serum antiprotease activity increased significantly at later period of challenge. In addition, few immune related genes pertinent to acute phase reactants and inflammatory response viz., complement component 3 (C3), lysozyme G, lysozyme C, β2-microglobulin (B2M), transferrin, interleukin 1β, interleukin 8, manganese superoxide dismutase (MnSOD), natural killer cell enhancing factor-B and chemokine CXCa were modulated after bacterial challenge. In liver, a significant up-regulation of C3 and transferrin, and down-regulation of lysozyme G, interleukin 8, MnSOD and B2M were noticed in survivors. On the contrary, lysozyme G, lysozyme C, interleukin 1β, interleukin 8, CXCa, and MnSOD were found to be significantly up-regulated and C3 was down-regulated in the kidney. All these data suggest that the innate immune factors were highly modulated during infection process to render protection of P. sarana to this bacterium. This study also generated the primary information on many innate immune molecules/genes for this important medium carp species for the first time.
  Veterinary Immunology and Immunopathology 05/2011; 142(3-4):207-18. · 2.08 Impact Factor
• Article: Ontogeny and tissue-specific expression of innate immune related genes in rohu, Labeo rohita (Hamilton).

  S P Nayak, B R Mohanty, J Mishra, P R Rauta, A Das, A E Eknath, P K Sahoo
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  ABSTRACT: The innate immune response in fish represents an early and rapid defense against pathogens. The present study aims at looking into ontogeny of innate immune system in the teleost, Labeo rohita using RT-PCR based approach. Total RNA extracted from unfertilized and fertilized eggs, and hatchlings (hatched at 28 ± 2 °C) at 0, 1, 3, 6, 12, 24 h, and 3, 7, 16, 21, 31 days post-fertilization were subjected to RT-PCR using self-designed or earlier published primers to amplify some innate immune relevant genes (lysozyme C, lysozyme G, beta-2 microglobulin, toll-like receptor 22-like and transferrin). The constitutive expression of β-actin was detected in unfertilized eggs and further developmental stages. Transferrin and TLR22-like mRNA transcripts were detected by RT-PCR from 6 h post-fertilization to 31 day post-fertilization, whereas β-2 microglobulin transcripts were detected only from 7 day post-fertilization onwards. Lysozyme C mRNA transcripts were detected from 24 h post-fertilization to 31 day post-fertilization. Lysozyme G mRNA transcripts were detected early from unfertilized egg stage onwards. Similarly, tissues viz. intestine, heart, ovary, gill, spleen, muscle, liver, brain, skin, anterior kidney, posterior kidney, and blood collected from juveniles of rohu were subjected to detection of all above mentioned gene transcripts by RT-PCR. β2-microglobulin mRNA transcript was expressed in all tissues. Lysozyme C mRNA expression is confined to blood and posterior kidney only whereas lysozyme G mRNA is expressed in all tissues. TLR22-like mRNA is expressed in all tissues except ovary and liver whereas transferrin mRNA transcript is detected only in liver. Finally, all these information taken are likely to shed light on the ontogeny of innate immunity in L. rohita, which offers new insights to developmental biology when compared to higher vertebrates and also helpful in the development of preventive measures against problems concerning infectious diseases.
  Fish &amp Shellfish Immunology 02/2011; 30(4-5):1197-201. · 3.32 Impact Factor