Melanocyte receptors: clinical implications and therapeutic relevance

J Andrew Carlson1, Gerald P Linette, Andrew Aplin

  • 1Division of Dermatopathology and Dermatology, Department of Pathology and Laboratory Medicine, Albany Medical College MC-81, 47 New Scotland Avenue, Albany, NY 12208, USA. carlsoa@mail.amc.edu

Dermatologic Clinics
|October 2, 2007
PubMed

Insights

Targeting melanocyte receptors like melanocortin-1 (MCR1) and melatonin receptors offers new ways to improve skin health and treat melanoma. These receptors and associated pathways are key targets for novel melanoma therapies.

Area of Science:

  • Dermatology and Oncology
  • Molecular Biology and Cell Signaling

Background:

  • Melanocyte-specific receptors regulate skin pigmentation and photoprotection.
  • Melanoma progression involves specific cell-surface receptors and signaling pathways.
  • Targeting these receptors presents therapeutic opportunities for melanocytic disorders.

Purpose of the Study:

  • To review current knowledge on melanocyte receptors and their role in melanoma.
  • To explore the therapeutic potential of targeting these receptors and associated pathways.
  • To discuss agonists and inhibitors for melanocyte receptor-based treatments.

Main Methods:

  • Review of current scientific literature on melanocyte receptors and melanoma.
  • Analysis of key cell-signaling pathways (RAS/RAF/MEK/ERK, PI3K/AKT) in melanoma.
  • Identification of therapeutic targets including melanocortin-1 (MCR1), melatonin receptors, Frizzled 5, c-Kit, and HGF receptor.

Main Results:

  • Melanocyte-specific receptors (MCR1, melatonin) and other receptors (Frizzled 5, c-Kit, HGF receptor) are crucial for melanocyte function and melanoma.
  • These receptors activate critical survival pathways (RAS/RAF/MEK/ERK, PI3K/AKT) in melanoma cells.
  • Activation of death receptors offers another therapeutic strategy for advanced melanoma.

Conclusions:

  • Modulating melanocyte receptors can enhance normal melanocyte function and treat melanoma.
  • Targeting specific receptors and signaling pathways holds significant promise for melanoma therapy.
  • Further research into receptor agonists and inhibitors is essential for developing effective treatments for melanocytic pathology.

Related Concept Videos

Changes in Skin Color: Clinical Perspectives01:14

Changes in Skin Color: Clinical Perspectives

The first thing a clinician sees is the skin, so the examination of the skin should be part of any thorough physical examination. Most skin disorders are relatively benign, but a few, including melanomas, can be fatal if untreated. A couple of the more noticeable disorders, albinism and vitiligo, affect the appearance of the skin and its accessory organs.
Albinism
Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...
Mitogens and the Cell Cycle02:38

Mitogens and the Cell Cycle

Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
Pigmentation01:19

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
Skin Cancer01:30

Skin Cancer

Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
Basal Cell Carcinoma (BCC): BCC is the most common type of skin cancer, accounting for about 80% of cases. It typically develops in...
Transducer Mechanism: Enzyme-Linked Receptors01:27

Transducer Mechanism: Enzyme-Linked Receptors

Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:
Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR activation may...