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              Open Access  
Copyright: The authors. This article is an open access 
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              Research 
              
(Published online: 
              16-03-2015) 
              
              14.
              
              Neutrophil dynamics in the blood and milk of 
              crossbred cows naturally infected with 
              Staphylococcus aureus - 
              Dilip K. Swain, 
              Mohar Singh Kushwah, Mandheer Kaur and Ajay K. Dang 
              
              Veterinary World, 8(3): 336-345   
              
   
                
                
doi: 
              10.14202/vetworld.2015.336-345   Dilip 
              K. Swain: 
              Division of Dairy Cattle Physiology, Lactation and 
              Immunophysiology Laboratory, National Dairy Research Institute, 
              Karnal - 132 001, Haryana, India;
              
              
              dilip_swain@yahoo.com Mohar 
              Singh Kushwah: 
              Division of Dairy Cattle Physiology, Lactation and 
              Immunophysiology Laboratory, National Dairy Research Institute, 
              Karnal - 132 001, Haryana, India;
              
              
              drmoharvet@gmail.com 
              Mandheer Kaur: 
              Division of Dairy Cattle Physiology, Lactation and 
              Immunophysiology Laboratory, National Dairy Research Institute, 
              Karnal - 132 001, Haryana, India;
              
              
              mandheerbiotech@yahoo.com Ajay K. 
              Dang: Division of Dairy Cattle Physiology, Lactation and 
              Immunophysiology Laboratory, National Dairy Research Institute, 
              Karnal - 132 001, Haryana, India;
              
              rajadang@gmail.com   Received: 
              02-11-2014, Revised: 31-01-2015, Accepted: 09-02-2015, Published 
              online: 16-03-2015   
              
              
              Corresponding author: 
              
              Parveen Kumar, e-mail: vetsparveen@gmail.com 
 
              Citation:Swain DK, Kushwah MS, 
              Kaur M, Dang AK (2015) Neutrophil dynamics in the blood and milk 
              of crossbred cows naturally infected with Staphylococcus aureus,
              Veterinary World 8(3):336-345. 
 
              Abstract 
 Aim:
              The present study was designed 
              to evaluate the neutrophil dynamics in terms of the functional 
              competence during subclinical mastitis (SCM) and clinical mastitis 
              (CM). 
              Materials and Methods: A total 
              of 146 Karan fries cows were screened and were divided into three 
              groups as control (n=12), SCM, n=12 and CM, n=12 groups on the 
              basis of California mastitis test scoring, bacteriological 
              evaluation, gross and morphological changes in milk and by 
              counting milk somatic cell count (SCC). Both blood and milk 
              polymorphonuclear neutrophils (PMNs) were isolated in the study. 
              Phagocytic activity (PA) was studied by spectrophotometrically; 
              neutrophil extracelluar traps (NETs) were studied by scanning 
              electron microscopy (SEM); CD44 was quantified by flow cytometry 
              and apoptosis was studied by fluorescent microscopy. 
              Results: Significantly 
              (p<0.05) higher SCC, PA was found in milk of CM cows as compared 
              to SCM and control cows. Significantly lower (p<0.05) apoptosis 
              was observed in PMNs isolated from both blood and milk of CM group 
              of cows when compared to control and SCM group. The milk 
              neutrophils of CM group of cows formed NETs as evidenced from the 
              SEM images. Surface expression of CD44 revealed a significantly 
              (p<0.05) lower expression in milk neutrophils of CM group of cows 
              when compared to SCM and control group of cows. 
              Conclusion: The study 
              indicated a positive correlation between delayed neutrophil 
              apoptosis, persistent staying of neutrophils at the site of 
              infection along with formation of NETs as the strategies to fight 
              against the pathogens in the udder during 
              Staphylococcal mastitis.
              The study forms a strong base 
              for future molecular research in terms of neutrophil recruitment 
              and neutrophil removal from the site of infection. 
              Keywords: 
              apoptosis, CD44, mastitis, neutrophil, neutrophil extracelluar 
              traps, Staphylococcus aureus. 
 
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