Radiobiology of the skin: review of some effects on epidermis and hair
Significant doses of ionizing radiation produce an acute skin reaction characterized by erythema, epilation, and dry or moist desquamation with or without erosions. These early acute changes are dose-dependent and reflect damage to the germinative cells of the epidermis and to the cutaneous vasculature. Studies in the pig, for example, have shown that the degenerative phase of cell loss (2-3 weeks) results from reproductive failure in germinative cells and a sharp reduction in the proliferation rate of basal cell ''survivors.'' D0 values for epidermal cells in different species generally range from 100-140 rads. Cell maturation and ascension rates in the suprabasilar layers are largely unaffected. A regenerative phase of cell replacement, characterized by sharply increased cell replication rates, occurs from the 3rd to 5th postradiation weeks. The postregenerative phase of hyperplasia reflects a temporary overshoot of cell density above control levels; a subsequent decrease in hyperplasia indicates feedback control of cellular proliferation. Postradiation changes in the highly proliferative anagen hair matrix cell populations result in hair dysplasia, slowed growth rates, impaired metabolic processes, and alopecia. Dosages of 700-800 rads or more induce some degree of permanent hair loss. G0 telogen matrix cells are 2-3 times more radioresistant than proliferating anagen matrix cells, but may ''store'' radiation damage for prolonged periods. Altered matrix cell uptake of amino acids, the incidence of dysplasia, and the degree of alopecia occurring after irradiation have all been used as quantitative biological end-points for the general study of cellular radiation effects, as well as studies on the enhancement of or protection against radiation damage provided by certain pharmacologic or physical agents.
- OSTI ID:
- 5635937
- Journal Information:
- J. Invest. Dermatol.; (United States), Vol. 77:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
EPIDERMIS
BIOLOGICAL RADIATION EFFECTS
EPILATION
RADIOINDUCTION
ERYTHEMA
HAIR
SKIN
CELL PROLIFERATION
DOSE-RESPONSE RELATIONSHIPS
IONIZING RADIATIONS
RADIOBIOLOGY
SWINE
ANIMAL TISSUES
ANIMALS
BIOLOGICAL EFFECTS
BIOLOGY
BODY
DOMESTIC ANIMALS
EPITHELIUM
MAMMALS
ORGANS
PATHOLOGICAL CHANGES
RADIATION EFFECTS
RADIATIONS
SYMPTOMS
TISSUES
VERTEBRATES
560152* - Radiation Effects on Animals- Animals