title: Expression of plasma membrane calcium pump isoform mRNAs in breast cancer cell lines.
abstract: The plasma membrane Ca(2+) ATPase (PMCA) is an important regulator of free intracellular calcium, with dynamic regulation in the rat mammary gland during lactation. Recent studies suggest that Ca(2+) plays a role in cellular proliferation. To determine if PMCA expression is altered in tumorigenesis, we compared relative levels of PMCA1 mRNA. We found that the relative expression of PMCA1 mRNA is increased, by approximately 270% and 170%, in MCF-7 and MDA-MB-231 human breast cancer cell lines deprived of serum for 72 h, respectively, compared to the similarly treated MCF-10A human mammary gland epithelial cell line. Characterization of PMCA mRNA isoforms revealed that PMCA1b and PMCA4 mRNA are expressed in MCF-7, MDA-MB-231, SK-BR-3, ZR-75-1 and BT-483 breast cancer cell lines. We also detected PMCA2 mRNA expression in all the breast cancer cell lines examined. However, PMCA3 mRNA was only detected in BT-483 cells. Our results suggest that PMCA expression may be altered in breast cancer cell lines, suggesting altered Ca(2+) regulation in these cell lines. Our results also indicate that breast cancer cell lines can express mRNAs for a variety PMCA isoforms.
mesh_terms: D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism*; D000252:Calcium-Transporting ATPases / Q000096:biosynthesis* / Q000235:genetics; D027682:Cation Transport Proteins; D005260:Female; D006801:Humans; D053499:Plasma Membrane Calcium-Transporting ATPases; D020033:Protein Isoforms / Q000096:biosynthesis / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis; D012334:RNA, Neoplasm / Q000096:biosynthesis*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014158:Transcription, Genetic; D014407:Tumor Cells, Cultured
chemical_list: C506952:ATP2B1 protein, human; D027682:Cation Transport Proteins; D020033:Protein Isoforms; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D053499:Plasma Membrane Calcium-Transporting ATPases; C506958:ATP2B2 protein, human; C506962:ATP2B3 protein, human; C506955:Atp2b1 protein, rat; D000252:Calcium-Transporting ATPases