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Laser-assisted microdissection and real-time PCR detect anti-inflammatory effect of perfluorocarbon

¹Klinik für Kinder und Jugendliche, Universität Erlangen-Nürnberg, D-91054 Erlangen; and ²Institut für Pathologie, Universität Gießen, D-35392 Gießen, Germany

Submitted 19 June 2002 ; accepted in final form 10 February 2003

The aim of this study was to identify cell types involved in the anti-inflammatory effect of ventilation with perfluorocarbon in vivo. Fifteen anesthetized, surfactant-depleted piglets received either aerosolized perfluorocarbon (Aerosol-PFC), partial liquid ventilation (rLV) at functional residual capacity (FRC) volume (FRC-PLV), or intermittent mandatory ventilation (control). After laser-assisted microdissection of different lung cell types, mRNA expression of IL-8 and ICAM-1 was determined using TaqMan real-time PCR normalized to hypoxanthine phosphoribosyltransferase (HPRT). IL-8 mRNA expression (means ± SE; control vs. Aerosol-PFC) was 356 ± 142 copies IL-8 mRNA/copy HPRT mRNA vs. 3.5 ± 1.8 in alveolar macrophages (P <0.01); 208 ± 108 vs. 2.7 ± 0.8 in bronchiolar epithelial cells (P <0.05); 26 ± 11 vs. 0.7 ± 0.2 in alveolar septum cells (P <0.01); 2.8 ± 1.0 vs. 0.8 ± 0.4 in bronchiolar smooth muscle cells (P <0.05); and 1.1 ± 0.4 vs. 0.2 ± 0.05 in vascular smooth muscle cells (P <0.05). With FRC-PLV, IL-8/HPRT mRNA expression was significantly lower in macrophages, bronchiolar epithelial, and vascular smooth muscle cells. ICAM-1 mRNA expression in vascular endothelial cells remained unchanged. Predominantly, alveolar macrophages and bronchiolar epithelial cells were involved in the inflammatory pulmonary process. The anti-inflammatory effect of Aerosol-PFC was most pronounced.

aerosolized perfluorocarbon; interleukin-8; surfactant-depleted piglets; polymerase chain reaction

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