PMID- 7577649 OWN - NLM STAT- MEDLINE DCOM- 19951204 LR - 20190705 IS - 0007-1048 (Print) IS - 0007-1048 (Linking) VI - 91 IP - 1 DP - 1995 Sep TI - Quantitation of soluble and membrane-bound Fc gamma RIIA (CD32A) mRNA in platelets and megakaryoblastic cell line (Meg-01). PG - 37-42 AB - Fc gamma receptors (Fc gamma Rs) are glycoproteins on platelet surface that bind IgG-containing immune complexes. However, excessive binding of immune complexes leads to platelet activation and thrombosis or increased platelet clearance and thrombocytopenia. In this study, Fc gamma R transcripts in platelets and megakaryoblastic cell line (Meg-01) were investigated using specifically designed oligonucleotides and a new quantitative in situ hybridization assay. Platelets and Meg-01 cells were found to express only Fc gamma RII transcripts. Of Fc gamma RIIA mRNA isoforms (Fc gamma RIIA, B and C), Fc gamma RIIA mRNA predominates in these cells. Platelets and Meg-01 cells contain both alternative spliced forms of Fc gamma RIIA mRNA, those with and without the transmembrane (TM) exon and both forms were present in near equal amounts. In contrast, Fc gamma RIIA transcript with the TM exon predominates in neutrophils and monocytes, suggesting that the splicing of the TM exon is under lineage-specific control. FAU - Markovic, B AU - Markovic B AD - Department of Haematology, School of Pathology, University of New South Wales, Sydney, Australia. FAU - Wu, Z AU - Wu Z FAU - Chesterman, C N AU - Chesterman CN FAU - Chong, B H AU - Chong BH LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - England TA - Br J Haematol JT - British journal of haematology JID - 0372544 RN - 0 (Antigens, CD) RN - 0 (Fc gamma receptor IIA) RN - 0 (RNA, Messenger) RN - 0 (Receptors, IgG) SB - IM MH - Antigens, CD/*analysis/genetics MH - Base Sequence MH - Blood Platelets/*chemistry MH - Cell Membrane/metabolism MH - Gene Expression MH - Humans MH - In Situ Hybridization/methods MH - Macrophages/metabolism MH - Megakaryocytes/*chemistry MH - Molecular Sequence Data MH - Neutrophils/metabolism MH - RNA, Messenger/genetics MH - Receptors, IgG/*analysis/genetics MH - Solubility MH - Tumor Cells, Cultured EDAT- 1995/09/01 00:00 MHDA- 1995/09/01 00:01 CRDT- 1995/09/01 00:00 PHST- 1995/09/01 00:00 [pubmed] PHST- 1995/09/01 00:01 [medline] PHST- 1995/09/01 00:00 [entrez] AID - 10.1111/j.1365-2141.1995.tb05241.x [doi] PST - ppublish SO - Br J Haematol. 1995 Sep;91(1):37-42. doi: 10.1111/j.1365-2141.1995.tb05241.x.