Narrow‑band UVB radiation promotes dendrite formation by activating Rac1 in B16 melanoma cells

Wang,Wu‑Qing; Wu,Jin‑Feng; Xiao,Xiao‑Qing; Xiao,Qin; Wang,Jing; Zuo,Fu‑Guo

doi:10.3892/mco.2013.145

Narrow‑band UVB radiation promotes dendrite formation by activating Rac1 in B16 melanoma cells

Authors:
- Wu‑Qing Wang
- Jin‑Feng Wu
- Xiao‑Qing Xiao
- Qin Xiao
- Jing Wang
- Fu‑Guo Zuo
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Affiliations: Department of Dermatology, The Central Hospital of Minhang, Shanghai 201199, P.R. China, Department of Dermatology, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China, Department of Dermatology, East Hospital, School of Medicine, Tongji University, Shanghai 200120, P.R. China
Published online on: July 11, 2013 https://doi.org/10.3892/mco.2013.145
Pages: 858-862

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Abstract

Melanocytes are found scattered throughout the basal layer of the epidermis. Following hormone or ultraviolet (UV) light stimulation, the melanin pigments contained in melanocytes are transferred through the dendrites to the surrounding keratinocytes to protect against UV light damage or carcinogenesis. This has been considered as a morphological indicator of melanocytes and melanoma cells. Small GTPases of the Rho family have been implicated in the regulation of actin reorganization underlying dendrite formation in melanocytes and melanoma cells. It has been proven that ultraviolet light plays a pivotal role in melanocyte dendrite formation; however, the molecular mechanism underlying this process has not been fully elucidated. the effect of small GTPases, such as Rac1 and RhoA, on the morphology of B16 melanoma cells treated with narrow‑band UVB radiation was investigated. The morphological changes were observed under a phase contrast microscope and the F‑actin microfilament of the cytoskeleton was observed under a laser scanning confocal microscope. The pull‑down assay was performed to detect the activity of the small GTPases Rac1 and RhoA. The morphological changes were evident, with globular cell bodies and increased numbers of tree branch‑like dendrites. the cytoskeletal F‑actin appeared disassembled following narrow‑band UVB irradiation of B16 melanoma cells. Treatment of B16 melanoma cells with narrow‑band UVB radiation resulted in the activation of Rac1 in a time‑dependent manner. In conclusion, the present study may provide a novel method through which narrow‑band UVB radiation may be used to promote dendrite formation by activating the Rac1 signaling pathway, resulting in F‑actin rearrangement in B16 melanoma cells.

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