Role of cell-cycle regulatory proteins in gynecological cancer

Karin Milde-Langosch1, Sabine Riethdorf

  • 1Institute of Pathology, Department of Gynecopathology, University Clinics Hamburg-Eppendorf, Hamburg, Germany. milde@uke.uni-hamburg.de

Insights

Understanding cell cycle regulation is key to fighting cancers. This review examines how cell cycle disruptions drive abnormal proliferation in gynecologic tumors, highlighting the need for a holistic pathway approach.

Area of Science:

  • Gynecologic Oncology
  • Molecular Biology
  • Cell Cycle Regulation

Background:

  • Human malignant tumors exhibit abnormal cell proliferation due to altered cell-cycle regulatory mechanisms.
  • This review focuses on aberrations in ovarian, endometrial, cervical, and vulvar cancers.

Purpose of the Study:

  • To summarize current knowledge on cell-cycle aberrations in gynecologic malignancies.
  • To emphasize the importance of viewing cell-cycle regulatory pathways holistically.

Main Methods:

  • Review of existing literature on cell-cycle regulation in gynecologic cancers.
  • Analysis of data concerning single protein effects versus pathway-level analysis.

Main Results:

  • Analyzing individual cell cycle proteins yields paradoxical results.
  • A comprehensive pathway-based approach is necessary to understand tumor proliferation.
  • Human papillomavirus (HPV) oncogenes E6 and E7 significantly impact cell-cycle control in associated carcinomas.

Conclusions:

  • Aberrant cell-cycle regulation is a hallmark of gynecologic cancers.
  • Holistic analysis of cell-cycle pathways is crucial for identifying mechanisms of abnormal proliferation.
  • Understanding viral oncogene effects is vital for HPV-associated cervical and vulvar cancers.

Related Concept Videos

Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
The Cell Cycle Control System02:11

The Cell Cycle Control System

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...
Positive Regulator Molecules02:39

Positive Regulator Molecules

Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
The Cell Cycle Control System02:11

The Cell Cycle Control System

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...
The Cell Cycle Control System01:28

The Cell Cycle Control System

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.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...
Molecular Factors Affecting Cell Division01:27

Molecular Factors Affecting Cell Division

Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...