Increased expression of the monocyte chemoattractant protein-1 in bronchial tissue from asthmatic subjects.
The expression of the monocyte chemoattractant protein (MCP-1), a member of the chemokine family of low molecular weight cytokines, was assessed by immunohistochemistry in bronchial biopsies from 12 asthmatic and 12 normal subjects. Both a monoclonal antibody (F9) and a polyclonal antibody were employed to detect MCP-1, while the mouse myeloma protein (MOPC21) was used as a negative control. Strong positive reactions for MCP-1 were seen in the bronchial epithelium. Subepithelial macrophages, blood vessels, and bronchial smooth muscle were also stained. Hue-saturation-intensity color image analysis was used to quantify reactions of the monoclonal antibody in the epithelial and subepithelial layers. With the monoclonal antibody, asthmatic biopsies showed 51.8 +/- 3.7% (mean +/- SEM) of the epithelium staining positively, whereas normal subjects reacted much less, with 6.4 +/- 1.9% of the epithelium staining (P < 0.0001); there was no overlap between the two groups. Likewise, staining was increased in the subepithelium of asthmatic airway biopsies, with 11.5 +/- 3.1% and 2.0 +/- 1.0% staining positively in asthmatic and normal subepithelium, respectively, (P < 0.002). There was a significant correlation between staining of the epithelium and subepithelium (r = 0.77, P < 0.001). The polyclonal anti-MCP-1 antibody also gave strong reactions in the epithelium and subepithelium, with 34.0 +/- 7.8% of the asthmatic and 1.6 +/- 1.0% of the normal bronchial epithelium staining positively (P < 0.0001). These increased levels of MCP-1 in the asthmatic airways suggest that they may play a role in macrophage recruitment and activation and thereby contribute to the inflammatory pathology of bronchial asthma.
Sousa
A R
AR
Department of Experimental Pathology, U.M.D.S., Guy's Hospital, London, United Kingdom.
Lane
S J
SJ
Nakhosteen
J A
JA
Yoshimura
T
T
Lee
T H
TH
Poston
R N
RN
D000328:Adult; D001249:Asthma / Q000378:metabolism*; D001706:Biopsy; D001980:Bronchi / Q000378:metabolism* / Q000473:pathology; D018932:Chemokine CCL2; D002630:Chemotactic Factors / Q000096:biosynthesis*; D016207:Cytokines; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male
D018932:Chemokine CCL2; D002630:Chemotactic Factors; D016207:Cytokines