Expression of hPMCA4b, the major form of the plasma membrane calcium pump in megakaryoblastoid cells is greatly reduced in mature human platelets

K. Pászty, T. Kovács, Christine Lacabaratz-Porret, Béla Papp, Jocelyne Enouf, Adelaide G. Filoteo, John T. Penniston, A. Enyedi

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Abstract

Antibodies 5F10 and JA3 (raised against the erythrocyte Ca2+ pump) were used to identify hPMCA4b as the major form of the plasma membrane Ca2+ pump in human platelets and in three human megakaryoblastoid cell lines, MEG 01, DAMI and CHRF 288-11. 5F10 was used because it has been shown to recognize all known isoforms of the hPMCA and JA3 because it reacts exclusively with hPMCA4b. In addition to hPMCA4b, hPMCA1b was also detected in the megakaryoblastoid cells by using isoform-specific polyclonal antibodies. The apparent size of this isoform, however, was smaller than that seen in HeLa and COS-7 cell membranes indicating the presence of a modified form of hPMCA1b. In platelets, no evidence of the expression of hPMCA1b could be found. The amount of PMCA in these cells was compared with that of the constitutive form of the sarco/endoplasmic reticulum Ca2+ pump in non-muscle cells (SERCA2b) and also with the amount of PMCA in human erythrocytes. A very low level of the plasma membrane Ca2+ pump was found in platelets while in their precursor cells the expression of this Ca2+ pump was much more abundant. Whereas the expression level of PMCA decreased dramatically in mature human platelets, the expression of SERCA2b did not change substantially upon megakaryocytic differentiation.

Original languageEnglish
Pages (from-to)129-135
Number of pages7
JournalCell Calcium
Volume24
Issue number2
DOIs
Publication statusPublished - Aug 1998

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Blood Platelets
Cell Membrane
Calcium
Protein Isoforms
Erythrocytes
Antibodies
COS Cells
Endoplasmic Reticulum
Cell Line

ASJC Scopus subject areas

  • Cell Biology
  • Endocrinology

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Expression of hPMCA4b, the major form of the plasma membrane calcium pump in megakaryoblastoid cells is greatly reduced in mature human platelets. / Pászty, K.; Kovács, T.; Lacabaratz-Porret, Christine; Papp, Béla; Enouf, Jocelyne; Filoteo, Adelaide G.; Penniston, John T.; Enyedi, A.

In: Cell Calcium, Vol. 24, No. 2, 08.1998, p. 129-135.

Research output: Contribution to journalArticle

Pászty, K. ; Kovács, T. ; Lacabaratz-Porret, Christine ; Papp, Béla ; Enouf, Jocelyne ; Filoteo, Adelaide G. ; Penniston, John T. ; Enyedi, A. / Expression of hPMCA4b, the major form of the plasma membrane calcium pump in megakaryoblastoid cells is greatly reduced in mature human platelets. In: Cell Calcium. 1998 ; Vol. 24, No. 2. pp. 129-135.
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abstract = "Antibodies 5F10 and JA3 (raised against the erythrocyte Ca2+ pump) were used to identify hPMCA4b as the major form of the plasma membrane Ca2+ pump in human platelets and in three human megakaryoblastoid cell lines, MEG 01, DAMI and CHRF 288-11. 5F10 was used because it has been shown to recognize all known isoforms of the hPMCA and JA3 because it reacts exclusively with hPMCA4b. In addition to hPMCA4b, hPMCA1b was also detected in the megakaryoblastoid cells by using isoform-specific polyclonal antibodies. The apparent size of this isoform, however, was smaller than that seen in HeLa and COS-7 cell membranes indicating the presence of a modified form of hPMCA1b. In platelets, no evidence of the expression of hPMCA1b could be found. The amount of PMCA in these cells was compared with that of the constitutive form of the sarco/endoplasmic reticulum Ca2+ pump in non-muscle cells (SERCA2b) and also with the amount of PMCA in human erythrocytes. A very low level of the plasma membrane Ca2+ pump was found in platelets while in their precursor cells the expression of this Ca2+ pump was much more abundant. Whereas the expression level of PMCA decreased dramatically in mature human platelets, the expression of SERCA2b did not change substantially upon megakaryocytic differentiation.",
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