title: Immunohistochemical properties of bone marrow mast cells in systemic mastocytosis: evidence for expression of CD2, CD117/Kit, and bcl-x(L).
abstract: In an attempt to identify novel diagnostic markers for mast cell (MC)-proliferative disorders, serial bone marrow (bm) sections of 22 patients with mastocytosis (systemic indolent mastocytosis, n = 19; mast cell leukemia [MCL], n = 1; isolated bm mastocytosis, n = 2) were analyzed by immunohistochemistry using antibodies against CD2, CD15, CD29, CD30, CD31, CD34, CD45, CD51, CD56, CD68R, CD117, HLA-DR, bcl-2, bcl-x(L), myeloperoxidase (MPO), and tryptase. Staining results revealed expression of bcl-x(L), CD68R, and tryptase in neoplastic MCs (focal dense infiltrates) in all patients. Mastocytosis infiltrates were also immunoreactive for CD45, CD117 (Kit), and HLA-DR. In most cases, the CD2 antibody produced reactivity with bm MCs in mastocytosis, whereas in control cases (reactive bm, immunocytoma, myelodysplastic syndrome), MCs were consistently CD2 negative. Expression of bcl-2 was detectable in a subset of MCs in the patient with MCL, whereas no reactivity was seen in patients with SIM or bm mastocytosis. Mastocytosis infiltrates did not react with antibodies against CD15, CD30, CD31, CD34, or MPO. In summary, our data confirm the diagnostic value of staining for tryptase, Kit, and CD68R in mastocytosis. Apart from these, CD2 may be a novel useful marker because MCs in mastocytosis frequently express this antigen, whereas MCs in other pathologic conditions are CD2 negative.
authors.affiliation: Department of Internal Medicine I, Division of Hematology and Hemostaseology, University of Vienna, Vienna, Austria.
authors.forename: J H
authors.initials: JH
authors.lastname: Jordan
authors.forename: S
authors.initials: S
authors.lastname: Walchshofer
authors.forename: W
authors.initials: W
authors.lastname: Jurecka
authors.forename: I
authors.initials: I
authors.lastname: Mosberger
authors.forename: W R
authors.initials: WR
authors.lastname: Sperr
authors.forename: K
authors.initials: K
authors.lastname: Wolff
authors.forename: A
authors.initials: A
authors.lastname: Chott
authors.forename: H J
authors.initials: HJ
authors.lastname: Bühring
authors.forename: K
authors.initials: K
authors.lastname: Lechner
authors.forename: H P
authors.initials: HP
authors.lastname: Horny
authors.forename: P
authors.initials: P
authors.lastname: Valent
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000032:analysis; D015214:Antigens, Differentiation, Myelomonocytic / Q000032:analysis; D001854:Bone Marrow Cells / Q000737:chemistry*; D018801:CD2 Antigens / Q000032:analysis*; D017809:Fatal Outcome; D005260:Female; D006684:HLA-DR Antigens / Q000032:analysis; D006801:Humans; D007150:Immunohistochemistry; D007946:Leukemia, Mast-Cell / Q000276:immunology / Q000378:metabolism; D017493:Leukocyte Common Antigens / Q000032:analysis; D008297:Male; D008407:Mast Cells / Q000737:chemistry*; D008415:Mastocytosis / Q000276:immunology / Q000378:metabolism*; D008875:Middle Aged; D011379:Prognosis; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000032:analysis*; D019009:Proto-Oncogene Proteins c-kit / Q000032:analysis*; D012074:Remission Induction; D012697:Serine Endopeptidases / Q000032:analysis; D053802:Tryptases; D051020:bcl-X Protein; D000097382:CD68 Molecule
chemical_list: D015703:Antigens, CD; D015214:Antigens, Differentiation, Myelomonocytic; D018801:CD2 Antigens; D006684:HLA-DR Antigens; D017493:Leukocyte Common Antigens; D019253:Proto-Oncogene Proteins c-bcl-2; D019009:Proto-Oncogene Proteins c-kit; D012697:Serine Endopeptidases; D053802:Tryptases; D051020:bcl-X Protein; C494811:BCL2L1 protein, human; C067980:CD68 antigen, human; D000097382:CD68 Molecule