Article (Scientific journals)
Extensive mast cell degranulation in bovine respiratory syncytial virus-associated paroxystic respiratory distress syndrome
Jolly, Sandra; Detilleux, Johann; Desmecht, Daniel
2004In Veterinary Immunology and Immunopathology, 97 (3-4), p. 125-136
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Keywords :
mast cell; cattle; RSV; tryptase; degranulation; respiratory distress syndrome
Abstract :
[en] Bovine respiratory syncytial virus (BRSV) infection is an important cause of outbreaks of respiratory disease among calves. This virus commonly induces mild to severe respiratory signs but, in a substantial proportion of cases, is also reported to be associated with paroxystic respiratory distress syndrome (PRDS). The pathogenesis of this 'malignant' clinical form has not been fully elucidated. The present study aimed at determining whether mast cell (MC) degranulation plays a role in the physiopathologic cascade leading to the PRDS. Paired serum samples were taken in herds during outbreaks of severe respiratory diseases (acute sera) and 3 weeks after (convalescent sera). Based on seroconversion to BRSV and clinical picture, 67 pairs of sera were selected from calves with a BRSV-associated PRDS for circulating MC tryptase determination. A MC metachromatic score was measured in post-mortem lungs from animals died from a BRSV-associated PRDS (principals) and compared with reference scores obtained from healthy lungs (controls). Levels of tryptase were significantly higher in acute sera (26.6+/-12.4 mug/l) compared to convalescent sera (8.4+/-7.8 mug/l; P < 0.001). Metachromatic scores yielded significantly different results between controls and principals (P < 0.01), demonstrating a significant disappearance of metachromatic granules from lung MCs in principals. Taken together, these data demonstrate the presence of an extensive MC degranulation in BRSV-associated PRDS. (C) 2003 Elsevier B.V. All rights reserved.
Disciplines :
Veterinary medicine & animal health
Immunology & infectious disease
Author, co-author :
Jolly, Sandra ;  Université de Liège - ULiège > Département de Morphologie et Pathologie > Pathologie spéciale et autopsies
Detilleux, Johann ;  Université de Liège - ULiège > Département de productions animales > Génétique quantitative
Desmecht, Daniel ;  Université de Liège - ULiège > Département de Morphologie et Pathologie > Pathologie spéciale et autopsies
Language :
English
Title :
Extensive mast cell degranulation in bovine respiratory syncytial virus-associated paroxystic respiratory distress syndrome
Publication date :
2004
Journal title :
Veterinary Immunology and Immunopathology
ISSN :
0165-2427
eISSN :
1873-2534
Publisher :
Elsevier Science Bv, Amsterdam, Netherlands
Volume :
97
Issue :
3-4
Pages :
125-136
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 08 January 2010

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