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. 1993 Sep;143(3):784–793.

Eosinophils expressing heparin-binding EGF-like growth factor mRNA localize around lung microvessels in pulmonary hypertension.

P P Powell 1, M Klagsbrun 1, J A Abraham 1, R C Jones 1
PMCID: PMC1887209  PMID: 8362977

Abstract

In pulmonary hypertension, induced in rats breathing high oxygen at normobaric pressure, vascular cell hypertrophy and hyperplasia thicken the walls of lung microvessels (15-100 microns in diameter). Over a 28-day time course, new contractile cells develop from intimal precursor smooth muscle cells, which include intermediate cells and interstitial fibroblasts. Cell labeling studies in vivo have shown that these cells proliferate more than other vascular cells and that most of this activity occurs between 4 and 7 days of hyperoxia. The growth factors responsible for this proliferation are unknown. In the present study, we investigate the expression of mRNA for the epidermal growth factor (EGF)-related protein, heparin-binding EGF-like growth factor (HB-EGF), a newly discovered mitogen for fibroblasts and smooth muscle cells. Northern analysis shows HB-EGF mRNA levels to be low in normal lung but increased 100-fold by day 7 of hyperoxia. In situ hybridization identifies a select group of cells expressing HB-EGF mRNA. In normal lung, hybridizing cells are randomly distributed in the alveolar wall and space. By day 7, they increase in number and cluster around the microvessels. Histochemical techniques identify cells expressing HB-EGF mRNA as eosinophils.

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