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Plasma membrane Ca2+-ATPase-mRNA expression in murine hepatocarcinoma and regenerating liver cells

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Abstract

The plasma membrane calcium ATPase (PMCA) is an ubiquitous enzyme that extrudes calcium from the cytoplasm to the extracellular space. Four PMCA genes through alternative splicing produce a large diversity of isoforms of this enzyme. We reported previously that the PMCA contained in AS-30D hepatocarcinoma cells showed significant differences in activity in comparison to normal and regenerating liver. In the present study we investigate if the difference in PMCA activity could be related to differential expression of mRNAs encoding different isoforms of PMCA. Using RT-PCR we found that variants 1b, 1x, and 4b are expressed in all liver samples. The hepatoma AS-30 and liver at 2 days of regeneration express low amounts of isoforms 2w, 4b and 4x, and do not express isoforms 4a, 4d and 4z. Fetal and neonatal liver do not express variants 4a and 4d, but they do express variants 4x and 4z. Immunoblot analysis showed a higher ratio ATPase/total protein in the hepatoma AS-30D in comparison to normal liver. Our results suggest that the Ca2+-ATPase kinetic pattern previously observed by us in the AS-30D cells, could be at least partially explained by changes in the mRNA expression of several of the PMCA isoforms expressed in the liver.

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Authors and Affiliations

  1. Instituto de Fisiología Celular, Facultad de Medicina, Universidad Nacional Autónoma de México, D.F, Mexico

    Blanca Delgado-Coello, Juan Santiago-García & Jaime Mas-Oliva

  2. Departamento de Bioquímica, Facultad de Medicina, Universidad Nacional Autónoma de México, D.F, Mexico

    Angel Zarain-Herzberg

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  1. Blanca Delgado-Coello
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  2. Juan Santiago-García
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  3. Angel Zarain-Herzberg
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  4. Jaime Mas-Oliva
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Delgado-Coello, B., Santiago-García, J., Zarain-Herzberg, A. et al. Plasma membrane Ca2+-ATPase-mRNA expression in murine hepatocarcinoma and regenerating liver cells. Mol Cell Biochem 247, 177–184 (2003). https://doi.org/10.1023/A:1024119831983

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