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01-04-2010 | Research Article

Detection of Experimentally Induced Pulmonary Granuloma Inflammation in Monocyte Chemoattractant Protein-1 Reporter Mice

Authors: Subbiah Rajasekaran, Vivia Yu-Ying Kao, Mei-Ru Chen, Alex Liang-Tung Yang, Ching-Han Hsu, Chin-Tu Chen, Kurt Ming-Chao Lin

Published in: Molecular Imaging and Biology | Issue 2/2010

Abstract

Purpose

Among different chemokines, monocyte chemoattractant protein-1 (MCP-1) plays an important role in inflammatory disorders of lung. In response to stimuli, MCP-1 increases its transcription as an immediate early gene. In this paper, we describe the MCP-1–enhanced green fluorescent protein(EGFP) transgenic mouse in which EGFP expression is driven by human MCP-1 promoter and mimics the MCP-1 expression in situ. Thus, the MCP-1 reporter mouse model is designed to facilitate a better understanding of its role in various diseases. We employed this mouse model in a pulmonary granulomatous inflammation model using intratracheal instillation of Sephadex (SDX) beads and compared the EGFP reporter expression to endogenous MCP-1 expression through the course of inflammation.

Procedures

We analyzed the temporal pattern of SDX-induced infiltration of inflammatory cells in lung and in bronchoalveolar lavage fluid (BALF). The changes in tissue fluorescence, gene, and protein expressions for both MCP-1 and EGFP were analyzed.

Results

SDX instillation caused massive infiltration of inflammatory cells in BALF and lung tissue at the end of day 3. There was an increase of fluorescence in SDX-treated lung and BALF cells. By using lipopolysaccharide-induced systemic inflammation model, increase of fluorescence was found in bone marrow Gr-1(+) cells with high Mac-1 expression. MCP-1 and EGFP gene expression and MCP-1 protein level were increased after day 1, peaked at day 3, and declined toward basal levels at day 5. In contrast, EGFP protein level peaked after day 3 and remained elevated after day 5. Immunohistochemical staining revealed the MCP-1 and EGFP expression primarily at alveolar macrophages, macrophages infiltrating the granulomatous lesions and in bronchiolar epithelial cells.

Conclusions

By using a pulmonary granuloma model, we showed that EGFP transgene reporter expression in MCP-1-EGFP mouse was correlated to the endogenous MCP-1 induction. The establishment of this mouse model will provide a valuable tool for monitoring the activation of monocytes/macrophages and facilitate the studies on the roles of MCP-1 gene in various inflammatory diseases.

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Title: Detection of Experimentally Induced Pulmonary Granuloma Inflammation in Monocyte Chemoattractant Protein-1 Reporter Mice
Authors: Subbiah Rajasekaran
Vivia Yu-Ying Kao
Mei-Ru Chen
Alex Liang-Tung Yang
Ching-Han Hsu
Chin-Tu Chen
Kurt Ming-Chao Lin
Publication date: 01-04-2010
Publisher: Springer-Verlag
Published in: Molecular Imaging and Biology / Issue 2/2010
Print ISSN: 1536-1632
Electronic ISSN: 1860-2002
DOI: https://doi.org/10.1007/s11307-009-0261-9

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Detection of Experimentally Induced Pulmonary Granuloma Inflammation in Monocyte Chemoattractant Protein-1 Reporter Mice

Abstract

Purpose

Procedures

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Procedures

Results

Conclusions

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