Abstract:
:Tryptases are serine proteases primarily expressed in mast cells. Normal blood basophils express only trace amounts of the enzyme. However, recent immunohistochemical studies have raised the possibility that neoplastic basophils express significant amounts of tryptase. In this study, tryptase expression was analyzed in normal and neoplastic basophils by immunoelectron microscopy using antitryptase monoclonal antibody G3. Basophils were obtained from patients with chronic myeloid leukemia (CML), idiopathic myelofibrosis (IMF), and myelodysplastic syndrome (MDS), and from healthy donors. Tryptase-immunoreactive material was detected in cytoplasmic granules of basophils in CML, IMF, and MDS. By contrast, normal basophils did not contain significant amounts of tryptase by immunoelectron microscopy. As assessed by reverse transcription-polymerase chain reaction, neoplastic basophils contained messenger RNA (mRNA) for alpha-tryptase, but no beta-tryptase mRNA. In summary, these data provide evidence that neoplastic basophils in CML, IMF, and MDS can express detectable amounts of tryptase. Therefore, tryptase should not be regarded as specific for mast cells when neoplastic myeloid cells are analyzed.
journal_name
Bloodjournal_title
Bloodauthors
Samorapoompichit P,Kiener HP,Schernthaner GH,Jordan JH,Agis H,Wimazal F,Baghestanian M,Rezaie-Majd A,Sperr WR,Lechner K,Valent Pdoi
10.1182/blood.v98.8.2580subject
Has Abstractpub_date
2001-10-15 00:00:00pages
2580-3issue
8eissn
0006-4971issn
1528-0020journal_volume
98pub_type
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