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Elevated Levels of the Neutrophil Chemoattractant Pro-Platelet Basic Protein in Macrophages From Individuals With Chronic and Allergic Aspergillosis.

Smith, Nicola L D; Bromley, Michael J; Denning, David W; Simpson, Angela; Bowyer, Paul

The Journal of infectious diseases. 2014;.

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Abstract

BACKGROUND:  Aspergillus fumigatus causes chronic cavitary pulmonary aspergillosis (CCPA) and allergic bronchopulmonary aspergillosis (ABPA) in overtly immunocompetent and atopic individuals, respectively. Disease mechanisms are poorly understood but may be related to increased neutrophil presence and activation. Pro-platelet basic protein (PPBP) is a potent neutrophil chemoattractant and activator whose expression is repressed by interleukin 10 (IL-10). METHODS:  PPBP expression by monocyte-derived macrophages from patients with ABPA or CCPA and asthmatic and healthy controls (10 individuals per group) was analyzed using reverse-transcription polymerase chain reaction. PPBP and IL-10 protein levels in cell culture supernatants were measured by enzyme-linked immunosorbent assay. Two PPBP single-nucleotide polymorphisms (SNPs) were genotyped in 638 individuals. The gene was resequenced in 20 individuals. RESULTS:  PPBP expression and protein levels were significantly increased in the ABPA (19.7-fold) and CCPA (27.7-fold) groups, compared with the control groups. PPBP SNPs were not associated with disease. IL-10 protein levels were significantly lower in the ABPA and CCPA groups, compared with the healthy group, suggesting that differences in PPBP levels may result from regulatory mechanisms. CONCLUSIONS:  The results suggest a role for increased PPBP expression in ABPA and CCPA. Repression of PPBP expression may benefit some patients. Increased PPBP expression in ABPA and CCPA may be useful as a future diagnostic tool or possible target for novel therapeutics.

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Digital Object Identifier:
10.1093/infdis/jiu490
Pubmed Identifier:
25193981
Pii Identifier:
jiu490
Access state:
Active

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Record metadata

Manchester eScholar ID:
uk-ac-man-scw:242213
Created by:
Heydon, Kirsty
Created:
5th December, 2014, 11:07:53
Last modified by:
Heydon, Kirsty
Last modified:
5th December, 2014, 11:07:53

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