The role of apoptosis in the pathogenesis of malignant melanoma

Liborija Lugović Mihić1, Vedrana Bulat, Mirna Situm

  • 1Department of Dermatology and Venereology, University Hospital Sestre Milosrdnice, Zagreb, Croatia. liborija@yahoo.com

Collegium Antropologicum
|February 10, 2011
PubMed

Insights

Malignant melanoma arises from complex cellular events, including gene mutations and disrupted apoptosis (programmed cell death). Understanding these processes is key for future melanoma treatment and patient monitoring.

Area of Science:

  • Oncology
  • Cell Biology
  • Genetics

Background:

  • Malignant melanoma development involves intricate pathogenetic cellular events.
  • Gene mutations and cellular mechanisms are crucial in melanocyte alteration and transformation into melanoma.
  • Apoptosis, a regulated cell death process, is disrupted in malignant melanoma cells, leading to uncontrolled proliferation.

Purpose of the Study:

  • To explore the role of apoptosis and molecular aberrations in malignant melanoma genesis.
  • To highlight the significance of cell signaling, cell cycle regulation, and apoptosis in cancer development.
  • To emphasize the future implications of understanding these cellular processes for melanoma treatment.

Main Methods:

  • Review of cellular events and molecular mechanisms in melanoma pathogenesis.
  • Analysis of the intrinsic and extrinsic apoptotic pathways.
  • Examination of the role of cell survival, growth arrest, and differentiation in malignant growth.

Main Results:

  • Disrupted apoptosis mechanisms contribute to uncontrolled proliferation in malignant melanoma.
  • Both intrinsic and extrinsic apoptotic pathways are involved and interconnected.
  • Molecular events regulating cell fate are central to malignant cell growth.

Conclusions:

  • Understanding molecular aberrations and cellular processes like apoptosis is essential for melanoma.
  • Future research into cell signaling, cell cycle, and apoptosis will aid patient monitoring.
  • This knowledge is vital for the rational design of effective melanoma treatments.

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The Intrinsic Apoptotic Pathway

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The Extrinsic Apoptotic Pathway01:17

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Apoptosis01:30

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Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size reduction of the tissue.
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Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside cells.
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...