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Related Experiment Videos

SERCA activity is required for timely progression through G1/S.

V R Simon1, M F Moran

  • 1Banting and Best Department of Medical Research, University of Toronto, ON, Canada. simon_viviana@hotmail.com

Cell Proliferation
|April 4, 2001
PubMed
Summary
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Long-term inactivation of the sarco-endoplasmic reticulum Ca2+ ATPase (SERCA) by thapsigargin (TG) significantly lengthens the G1 phase. This SERCA inhibition disrupts cell cycle progression and impacts cell morphology and protein levels.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Intracellular calcium (Ca2+) dynamics are critical regulators of cell cycle progression.
  • The G1 phase is a key period for cell growth and preparation for DNA replication.

Purpose of the Study:

  • To investigate the specific role of Ca2+ homeostasis in the G1 phase of the cell cycle.
  • To determine the impact of sarco-endoplasmic reticulum Ca2+ ATPase (SERCA) inhibition on G1/S transition.

Main Methods:

  • HEK 293 cells were synchronized in mitosis and released into G1.
  • Cells were treated with thapsigargin (TG) to inhibit SERCA activity.
  • Cellular morphology, attachment, MAPK activity, and cyclin D1/E protein levels were assessed.
  • Experiments included transient Ca2+ alterations and expression of TG-resistant SERCA.

Related Experiment Videos

Main Results:

  • Irreversible SERCA inhibition with TG significantly prolonged the G1 phase.
  • TG treatment caused morphological changes, reduced cell attachment, decreased MAPK activity, and lowered cyclin D1 and E levels.
  • Transient Ca2+ changes or temporary SERCA inactivation did not affect G1 progression.
  • Cells expressing a TG-resistant SERCA mutant completed G1/S transition normally after TG treatment.

Conclusions:

  • Long-term inactivation of SERCA disrupts critical events in the G1 phase.
  • Sustained disruption of Ca2+ homeostasis by SERCA inhibition compromises cell cycle progression through G1/S.
  • These findings highlight the importance of continuous SERCA function for normal cell cycle progression.