CD28 down-regulation on circulating CD4 T-cells is associated with poor prognoses of patients with idiopathic pulmonary fibrosis.

PloS One
Syed R GilaniSteven R Duncan

Abstract

Although the etiology of idiopathic pulmonary fibrosis (IPF) remains perplexing, adaptive immune activation is evident among many afflicted patients. Repeated cycles of antigen-induced proliferation cause T-cells to lose surface expression of CD28, and we hypothesized this process might also occur in IPF. Peripheral blood CD4 T-cells from 89 IPF patients were analyzed by flow cytometry and cytokine multiplex assays, and correlated with clinical events. In comparison to autologous CD4(+)CD28(+)cells, the unusual CD4(+)CD28(null) lymphocytes seen in many IPF patients had discordant expressions of activation markers, more frequently produced cytotoxic mediators perforin (2.4+/-0.8% vs. 60.0+/-7.4%, p<0.0001) and granzyme B (4.5+/-2.8% vs.74.9+/-6.5%, p<0.0001), produced greater amounts of many pro-inflammatory cytokines, and less frequently expressed the regulatory T-cell marker FoxP3 (12.9+/-1.1% vs. 3.3+/-0.6% p<0.0001). Infiltration of CD4(+)CD28(null) T-cells in IPF lungs was confirmed by confocal microscopy. Interval changes of CD28 expression among subjects who had replicate studies were correlated with conterminous changes of their forced vital capacities (r(s) = 0.49, p = 0.012). Most importantly, one-year freedom from maj...Continue Reading

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Methods Mentioned

BETA
lavage
flow cytometry
biopsy
confocal microscopy
biopsies
density

Software Mentioned

- itâ¢
Analyse
StatViewâ¢
Adobe Photoshop
- it

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