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The Cell Cycle Control System01:28

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The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
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The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
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Light-Controlled Cell-Cycle Arrest and Apoptosis.

Edgar Uhl1, Friederike Wolff2, Sriyash Mangal2

  • 1Ludwig-Maximilians-Universität München, Department of Chemistry and Center for Integrated Protein Science CIPSM, Butenandtstr. 5-13, 81377, München, Germany.

Angewandte Chemie (International Ed. in English)
|October 9, 2020
PubMed
Summary

Researchers developed a photocaging method to control cell-cycle arrest and apoptosis using blue light. This photopharmacological approach offers precise, reversible control over proteasome inhibition for biological and medical applications.

Keywords:
MG132apoptosiscell cyclechemical biologyphotopharmacologyproteasome

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Pharmacology

Background:

  • Small molecules controlling cell-cycle progression are vital for studying biological mechanisms and treating diseases like cancer.
  • Current methods for spatio-temporal control of the cell cycle are limited.

Purpose of the Study:

  • To develop a photocaging strategy for reversible cell-cycle arrest and apoptosis induction using blue-light irradiation.
  • To enable precise spatio-temporal control over proteasome inhibition.

Main Methods:

  • Photocaging of the proteasome inhibitor MG132 at its reactive aldehyde function.
  • Irradiation with blue light to induce uncaging and biological activity.
  • In vivo and in vitro experiments using human cancer cells and dynamic microscopy.

Main Results:

  • Photocaged MG132 demonstrated reversible cell-cycle arrest at metaphase upon blue-light irradiation in vivo.
  • Apoptosis was efficiently induced in human cancer cells following irradiation.
  • Caged MG132 showed no effect on cell proliferation in the dark, indicating high light-modulation precision.
  • The uncaging process was fully compatible with dynamic microscopy techniques.

Conclusions:

  • A novel photopharmacological approach enables precise spatio-temporal control of the cell cycle and apoptosis via visible-light-responsive proteasome inhibition.
  • This visible-light responsive tool is valuable for biological research and medicinal applications requiring high-precision targeting of the proteasome.