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Adult-onset hereditary pulmonary alveolar proteinosis caused by a single-base deletion in CSF2RB
  1. Takeshi Tanaka1,
  2. Natsuki Motoi2,
  3. Yoshiko Tsuchihashi1,
  4. Ryushi Tazawa2,
  5. Chinatsu Kaneko2,
  6. Takahito Nei2,
  7. Toshiyuki Yamamoto3,
  8. Tomayoshi Hayashi4,
  9. Tsutomu Tagawa5,
  10. Takeshi Nagayasu5,
  11. Futoshi Kuribayashi6,
  12. Koya Ariyoshi1,
  13. Koh Nakata2,
  14. Konosuke Morimoto1
  1. 1Department of Clinical Medicine, Institute of Tropical Medicine, Nagasaki University, Nagasaki, Japan
  2. 2Bioscience Medical Research Center, Niigata University Medical & Dental Hospital, Niigata, Japan
  3. 3Tokyo Women's Medical University, Institute for Integrated Medical Sciences, Tokyo, Japan
  4. 4Department of Pathology, Nagasaki University Hospital, Nagasaki, Japan
  5. 5Division of Surgical Oncology, Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
  6. 6Department of Biochemistry, Kawasaki Medical School, Okayama, Japan
  1. Correspondence to Dr Koh Nakata, Bioscience Medical Research Center, Niigata University Medical & Dental Hospital, 1-754, Asashimachi-dori, Chuo-ku, Niigata 951-8520, Japan; radical{at}med.niigata-u.ac.jp

Abstract

Background Disruption of granulocyte/macrophage colony-stimulating factor (GM-CSF) signalling causes pulmonary alveolar proteinosis (PAP). Rarely, genetic defects in neonatal or infant-onset PAP have been identified in CSF2RA. However, no report has clearly identified any function-associated genetic defect in CSF2RB.

Methods and results The patient was diagnosed with PAP at the age of 36 and developed respiratory failure. She was negative for GM-CSF autoantibody and had no underlying disease. Signalling and genetic defects in GM-CSF receptor were screened. GM-CSF-stimulated STAT5 phosphorylation was not observed and GM-CSF-Rβc expression was defective in the patient's blood cells. Genetic screening revealed a homozygous, single-base deletion at nt 631 in exon 6 of CSF2RB on chromosome 22, which caused reductions in GM-CSF dependent signalling and function. Both parents, who were second cousins, showed no pulmonary symptoms, and had normal GM-CSF-signalling, but had a CSF2RB allele with the identical deletion, indicating that the mutant allele may give rise to PAP in an autosomal recessive manner.

Conclusions This is the first report identifying a genetic defect in CSF2RB that causes deficiency of GM-CSF-Rβc expression and impaired signalling downstream. These results suggested that GM-CSF signalling was compensated by other signalling pathways, leading to adult-onset PAP.

  • CSF2RB
  • pulmonary alveolar proteinosis
  • GM-CSF
  • GM-CSF receptor
  • mutation
  • respiratory medicine

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Footnotes

  • Funding This work was supported in part by grants from the Japanese Ministry of Education and Science, the Ministry of Health, Labor and Welfare of Japan (H15-trans-014), and the Japanese Society for the Promotion of Science (200390230, 20659130).

  • Competing interests None.

  • Patient consent Obtained.

  • Ethics approval This study was conducted with the approval of the institutional review boards of Nagasaki University and Niigata University.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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