title: Drastic changes in the tissue-specific expression of secreted phospholipases A2 in chicken pulmonary disease.
abstract: Infectious bronchitis is one of the most important diseases in poultry and it causes major economic losses. Infectious bronchitis is an acute, highly contagious, viral disease of chickens, characterized by rales, coughing, and sneezing. Because secreted phospholipases A2 (sPLA2) are involved in inflammatory processes, the gene expressions of sPLA2s were investigated in both healthy chickens and chickens with infectious bronchitis and lung inflammation. The draft chicken genome was first scanned using human sPLA2 sequences to identify chicken sPLA2s (ChPLA2), chicken total mRNA were isolated and RT-PCR experiments were performed to amplify and then sequence orthologous cDNAs. Full-length cDNA sequences of ChPLA2-IB, -IIA, -IIE, -V and -X were cloned. The high degree of sequence identity of 50-70% between the avian and mammalian (human and mouse) sPLA2 orthologs suggests a conservation of important enzymatic functions for these phospholipases. Quantitation by qPCR of the transcript levels of ChPLA2-IB, -IIA, -IIE, -V and -X in several tissues from healthy chicken indicated that the expression patterns and mRNA levels diverged among the phospholipases tested. In chicken with infectious bronchitis, an over expression of ChPLA2-V was observed in lungs and spleen in comparison with healthy chicken. These findings suggest that ChPLA2-V could be a potential biomarker for lung inflammation. Conversely, a down regulation of ChPLA2-IB, -IIA and -X was observed in lungs and spleen in case of infectious bronchitis. A significant increase in the expression level of ChPLA2-X and ChPLA2-IB was also noticed in pancreas. No or minor changes have been detected in the expression of ChPLA2-IIE in lungs and small intestine, but it shows a significant increase in several infected tissues.
authors: Laboratoire de Biochimie et de Génie Enzymatique des Lipases, ENIS Route de Soukra, université de Sfax, Tunisia.
authors: Aida
authors: A
authors: Karray
authors: Yassine
authors: Y
authors: Ben Ali
authors: Jamil
authors: J
authors: Boujelben
authors: Sawsan
authors: S
authors: Amara
authors: Frédéric
authors: F
authors: Carrière
authors: Youssef
authors: Y
authors: Gargouri
authors: Sofiane
authors: S
authors: Bezzine
mesh_terms: D000818:Animals; D030161:Avian Proteins / Q000235:genetics* / Q000378:metabolism; D001483:Base Sequence; D002645:Chickens; D003001:Cloning, Molecular; D017124:Conserved Sequence; D018352:Coronavirus Infections / Q000201:enzymology / Q000662:veterinary* / Q000821:virology; D018076:DNA, Complementary / Q000096:biosynthesis; D004926:Escherichia coli; D015870:Gene Expression; D001351:Infectious bronchitis virus / Q000502:physiology*; D008168:Lung / Q000201:enzymology / Q000821:virology; D008969:Molecular Sequence Data; D009928:Organ Specificity; D010179:Pancreas / Q000201:enzymology / Q000821:virology; D054497:Phospholipases A2, Secretory / Q000235:genetics* / Q000378:metabolism; D011201:Poultry Diseases / Q000201:enzymology* / Q000821:virology; D060888:Real-Time Polymerase Chain Reaction; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013154:Spleen / Q000201:enzymology / Q000821:virology
chemical_list: D030161:Avian Proteins; D018076:DNA, Complementary; D011994:Recombinant Proteins; D054497:Phospholipases A2, Secretory