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2012 ; 2
(1
): 165-86
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Endoplasmic reticulum calcium pumps and cancer cell differentiation
#MMPMID24970132
Papp B
; Brouland JP
; Arbabian A
; Gélébart P
; Kovács T
; Bobe R
; Enouf J
; Varin-Blank N
; Apáti A
Biomolecules
2012[Mar]; 2
(1
): 165-86
PMID24970132
show ga
The endoplasmic reticulum (ER) is a major intracellular calcium storage pool and
a multifunctional organelle that accomplishes several calcium-dependent functions
involved in many homeostatic and signaling mechanisms. Calcium is accumulated in
the ER by Sarco/Endoplasmic Reticulum Calcium ATPase (SERCA)-type calcium pumps.
SERCA activity can determine ER calcium content available for intra-ER functions
and for calcium release into the cytosol, and can shape the spatiotemporal
characteristics of calcium signals. SERCA function therefore constitutes an
important nodal point in the regulation of cellular calcium homeostasis and
signaling, and can exert important effects on cell growth, differentiation and
survival. In several cell types such as cells of hematopoietic origin, mammary,
gastric and colonic epithelium, SERCA2 and SERCA3-type calcium pumps are
simultaneously expressed, and SERCA3 expression levels undergo significant
changes during cell differentiation, activation or immortalization. In addition,
SERCA3 expression is decreased or lost in several tumor types when compared to
the corresponding normal tissue. These observations indicate that ER calcium
homeostasis is remodeled during cell differentiation, and may present defects due
to decreased SERCA3 expression in tumors. Modulation of the state of
differentiation of the ER reflected by SERCA3 expression constitutes an
interesting new aspect of cell differentiation and tumor biology.