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Characterisation of lymphocyte subpopulations in infantile haemangioma
  1. Elysia M S Tan1,
  2. Tinte Itinteang1,
  3. Daria A Chudakova1,
  4. Jonathan C Dunne1,
  5. Reginald Marsh1,2,
  6. Helen D Brasch1,
  7. Paul F Davis1,
  8. Swee T Tan1,3
  1. 1Gillies McIndoe Research Institute, Wellington, New Zealand
  2. 2University of Auckland, Auckland, New Zealand
  3. 3Centre for the Study & Treatment of Vascular Birthmarks, Wellington Regional Plastic, Maxillofacial & Burns Unit, Hutt Hospital, Wellington, New Zealand
  1. Correspondence to Dr Swee T Tan, Gillies McIndoe Research Institute, P.O. Box 7184, Newtown, Wellington 6242, New Zealand; swee.tan{at}gmri.org.nz

Abstract

Aims Interstitial CD45+ cells and T lymphocytes have previously been demonstrated within infantile haemangioma (IH). This study investigated the expression of B and T lymphocyte markers by the CD45+ population, and the expression of Thy-1, a marker of thymocyte progenitors, which have the ability to give rise to both B and T cells.

Methods Immunohistochemical (IHC) staining was performed on proliferating and involuted IHs for the expression of CD45, CD3, CD20, CD79a, Thy-1 and CD34. The presence of mRNA corresponding to CD45, CD3G, CD20 and Thy-1 was confirmed by reverse transcriptase-polymerase chain reaction in snap-frozen IH tissues. Cell counting of 3,3-diaminobenzidine IHC-stained slides was performed on CD45+ only cells and dually stained CD45+/CD3+ cells or CD45+/CD20+ cells and analysed statistically. In situ hybridisation and mass spectrometry were also performed to confirm the presence and abundance of Thy-1, respectively.

Results IHC staining showed a subpopulation of CD45+ interstitial cells that expressed the T lymphocyte marker, CD3, and another subpopulation that expressed the B lymphocyte marker, CD20, in proliferating and diminished in involuted IHs. The abundant expression of Thy-1 on the endothelium of proliferating, but not involuted IH, was demonstrated by IHC staining and confirmed by in situ hybridisation and mass spectrometry.

Conclusions Both B and T lymphocytes are present within the interstitium of proliferating and involuted IH. The expression of Thy-1 by the endothelium suggests that B and T cells in IH may have originated from within the lesion, rather than migrating from the peripheral circulation.

  • LYMPHOCYTES
  • VASCULAR TUMOURS
  • HAEMATOLOGY
  • PAEDIATRIC PATHOLOGY
  • IMMUNOHISTOCHEMISTRY

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