[Physiology of skin pigmentation].

Area of Science:

• Dermatology
• Cell Biology
• Biochemistry

Background:

• Skin color is primarily determined by melanin pigments within the epidermis and dermis.
• Other endogenous and exogenous pigments like iron and carotene also contribute to skin tone.

Purpose of the Study:

• To present a comprehensive study on melanogenesis, the biological process of melanin synthesis.
• To review the structural characteristics and biosynthesis pathways of eumelanins and phaeomelanins.

Main Methods:

• Examination of the functional unit of epidermal melanization, comprising melanocytes and keratinocytes.
• Analysis of melanosome synthesis, maturation, transfer, and degradation within keratinocytes.

Main Results:

• Detailed review of eumelanin and phaeomelanin structures and their biosynthetic steps.
• Description of the melanocyte-keratinocyte interaction in pigment production and transfer.

Conclusions:

• Melanogenesis is a complex process involving specialized epidermal units.
• Key factors influencing melanogenesis include genetic control, ultraviolet radiation exposure, and endocrine signaling.