Document Detail

Reduction in number and morphologic alterations of Langerhans cells after UVB radiation in vivo are accompanied by an influx of monocytoid cells into the epidermis.
MedLine Citation:
PMID:  9856829     Owner:  NLM     Status:  MEDLINE    
Acute, low-dose ultraviolet B (UVB) radiation impairs contact hypersensitivity induction in mice by a mechanism due at least in part to Langerhans cells alterations. To better define the effects of UVB on Langerhans cells, we have compared the action of this agent on the skin of intact mice and in skin explants incubated in vitro up to 24 h. Using immunofluorescence, we detected a reduction in the length of the dendrites of Langerhans cells and a significant reduction in the number of Ia-positive Langerhans cells per unit area within 2 h of UVB; these changes reversed within 24 h in vivo, but not in vitro. By electron microscopy, the number of dendritic cells per 100 basal keratinocytes increased in vivo, but decreased in vitro by 2 h after UVB, a discordance that was significant. On the contrary, the number of dendrite profiles per dendritic cell body decreased significantly 2 h after UVB, both in vivo and in vitro. Many epidermal dendritic cells, 2 h after UVB in vivo, were deficient in cytoplasmic organelles, whereas the few cells that remained after UVB in vitro retained their Birbeck granules, and displayed many, dilated cytoplasmic vesicles. We interpret these data to mean that low doses of UVB radiation destroy the functional and morphologic integrity of epidermal Langerhans cells, and that these cells are rapidly replaced by precursor cells that mature in situ into normal-appearing Langerhans cells.
S Bacci; P Romagnoli; J W Streilein
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Publication Detail:
Type:  Comparative Study; In Vitro; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of investigative dermatology     Volume:  111     ISSN:  0022-202X     ISO Abbreviation:  J. Invest. Dermatol.     Publication Date:  1998 Dec 
Date Detail:
Created Date:  1999-01-04     Completed Date:  1999-01-04     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0426720     Medline TA:  J Invest Dermatol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1134-9     Citation Subset:  IM    
Department of Human Anatomy and Histology, University of Florence, Italy.
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MeSH Terms
Cell Count / radiation effects
Cell Movement
Epidermis / cytology*
Langerhans Cells / cytology*,  radiation effects*,  ultrastructure
Mice, Inbred BALB C
Microscopy, Electron
Monocytes / cytology*
Skin / cytology
Ultraviolet Rays*
Grant Support

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