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Research (Published online: 05-11-2015)

2. Cross antigenicity of immunodominant polypeptides of somatic antigen of Oesophagostomum columbianum with other helminths by western blotting - Sunita Dalal, Arvind Prasad, Abdul Nasir and Vijesh Kumar Saini

Veterinary World, 8(11): 1279-1285

 

 

   doi: 10.14202/vetworld.2015.1279-1285

 

Sunita Dalal: Network Program on G.I. Parasitism, Division of Parasitology, Indian Veterinary Research Institute, Izatnagar, Bareilly,
Uttar Pradesh, India;
drsunita009@gmail.com

Arvind Prasad: Network Program on G.I. Parasitism, Division of Parasitology, Indian Veterinary Research Institute, Izatnagar, Bareilly,
Uttar Pradesh, India;
drarvindivri@rediffmail.com

Abdul Nasir: Network Program on G.I. Parasitism, Division of Parasitology, Indian Veterinary Research Institute, Izatnagar, Bareilly,
Uttar Pradesh, India;
drnasirivri@rediffmail.com

Vijesh Kumar Saini: Network Program on G.I. Parasitism, Division of Parasitology, Indian Veterinary Research Institute, Izatnagar, Bareilly,
Uttar Pradesh, India; vijesh24@gmail.com


Received: 20-06-2015, Revised: 17-09-2015, Accepted: 24-09-2015, Published online: 05-11-2015

 

Corresponding author: Arvind Prasad, e-mail: drarvindivri@rediffmail.com


Citation: Dalal S, Prasad A, Nasir A, Saini VK (2015) Cross antigenicity of immunodominant polypeptides of the somatic antigen of Oesophagostomum columbianum with other helminths by western blotting, Veterinary World 8(11): 1279-1285.



Aim: Oesophagostomum columbianum in small ruminants in India is found as mixed infection commonly in sheep and goat. Haemonchus contortus, an abomasal nematode is found as concurrent infection with it. Eggs of Haemonchus and O. columbianum cannot be easily distinguished. Diagnosis of O. columbianum may only be possible if a non-cross antigenic polypeptide was available for immunodiagnosis.

Materials and Methods: Somatic antigen (SoAg) of O. columbianum was fractionated by sodium dodecyl sulfatepolyacrylamide gel electrophoresis and immunodominant polypeptides were identified by western blotting with homologous hyperimmune serum (HIS) and experimental sera of sheep or goat infected with other helminths.

Results: SoAg of O. columbianum was immunoaffinity purified. Sharp polypeptide bands of 130, 72 and 68 KDa were observed along with several faint bands of lower molecular weight. Western blot of purified SoAg of O. columbianum with homologous HIS showed reaction with all the protein bands of 17, 28, 30, 32, 35, 38, 50, 68, 100, 130, 150, and 170 kDa. For identification of non-cross antigenic polypeptide, immunoaffinity purified SoAg of O. columbianum was reacted to heterologous HIS against H. contortus, Paramphistomum epiclitum, and Fasciola gigantica in western blotting utilizing completely dry method (i-blot). Among high molecular weight polypeptides 100 and 150 kDa were non-cross antigenic and among low molecular weight except 50 kDa polypeptide, 17, 30, 32, 35, and 38 kDa of O. columbianum were not cross antigenic with other helminths.

Conclusions: Hence, polypeptides of 17, 30, 32, 35 and 38 kDa as well as 100 and 150 kDa polypeptides of O. columbianum may be exploited for immunodiagnosis of the infection in sheep and goat with extensive studies on cross antigenicity.

Keywords: cross antigenicity, hyperimmune sera, immunodiagnostic polypeptides, Oesophagostomum columbianum. 



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