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Endotoxin receptor CD14 in PiZ alpha-1-antitrypsin deficiency individuals

Caroline S Sandström1, Natalia Novoradovskaya, Corrado M Cilio

  • 1Department of Clinical Sciences, Chronic and Degenerative Disease Research Unit, University Hospital Malmoe, Lund University, S-20502, Malmo, Sweden. Caroline.Sandstrom@med.lu.se

Respiratory Research
|April 23, 2008
PubMed
Abstract

Insights

Young, healthy individuals with alpha-1 antitrypsin (AAT) deficiency (PiZZ genotype) show elevated soluble CD14 (sCD14) in plasma and increased membrane-bound CD14 (mCD14) on monocytes.

Area of Science:

  • Immunology
  • Genetics
  • Biochemistry

Background:

  • Soluble CD14 (sCD14) is released from monocytes via serine protease shedding.
  • Alpha-1 antitrypsin (AAT) inhibits serine proteases and influences CD14 expression.
  • Investigating CD14 levels in AAT deficiency provides insight into protease regulation.

Purpose of the Study:

  • To determine plasma sCD14 levels in young adults with AAT deficiency genotypes (PiZZ, PiSZ).
  • To analyze monocyte membrane-bound CD14 (mCD14) expression in these individuals.
  • To compare findings with age-matched healthy controls (PiMM genotype).

Main Methods:

  • Plasma AAT and sCD14 levels were quantified using immunoassays.
  • Monocyte mCD14 expression was analyzed via flow cytometry (FACS).
  • Quantitative Real-Time Reverse Transcription PCR (qRT-PCR) assessed mCD14 gene expression.

Main Results:

  • Plasma AAT levels confirmed the expected genotype-dependent gradient (PiMM > PiSZ > PiZZ).
  • Significantly higher plasma sCD14 levels were observed in PiZZ subjects compared to PiMM controls.
  • Monocytes from PiZZ subjects exhibited significantly higher mCD14 expression (1.89-fold) than PiMM controls.

Conclusions:

  • This study demonstrates elevated plasma sCD14 and monocyte mCD14 expression in clinically healthy young PiZZ individuals.
  • Findings suggest a link between AAT deficiency and altered CD14 regulation.
  • Further research is warranted to explore the implications of these findings.

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