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2017 ; 13
(1
): 235-241
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Fundamental research on the action mechanism of the 800 nm semiconductor laser on
skin blackheads and coarse pores
#MMPMID28428827
Lin J
; Jing L
; Zhu H
; Dong FS
Exp Ther Med
2017[Jan]; 13
(1
): 235-241
PMID28428827
show ga
The aim of the study was to determine the mechanism of action of the 800 nm
semiconductor laser on skin blackheads and coarse pores. A total of 24 healthy
purebred short-haired male guinea pigs, weighing 350-400 g, were selected and
smeared with 0.5 ml coal tar suspension evenly by injector once daily. Treatment
was continued for 14 days to form an experimental area of 8×3 cm on the back of
the guinea pigs. The animals were divided into the following groups: Normal
control group (NC), low-dose laser treatment group (L-LS), high-dose laser
treatment group (H-LS), and Q-switched Nd:YAG treatment group (QC). Samples were
extracted 1, 7 and 14 days after surgery and hematoxylin and eosin staining was
used to identify the following: Epidermis, dermis, sebaceous gland change and
hair follicle damage; the expression of proliferating cell nuclear antigen (PCNA)
of sebaceous gland cells using immunohistochemistry; sebaceous gland cell
apoptosis using TUNEL; and the protein expression of caspase-3, Bax and Bcl-2
using western blot analysis. With the extension of time, we observed inflammatory
cell infiltration, an increase in hair follicle distortion and necrosis of the
surrounding hair follicles. The expression levels of PCNA of the L-LS, H-LS and
QC groups decreased with time. Regarding the respective time points, the NC group
was highest, the L-LS and H-LS groups were next highest and the H-LS group was
lowest. The difference was statistically significant (P<0.05). The apoptotic rate
of the L-LS, H-LS and QC groups increased with time. With regard to the
respective time points, the NC group was lowest, the L-LS and QC groups were next
lowest and the H-LS group was highest. The difference was statistically
significant (P<0.05). The protein expression of caspase-3, Bax and Bcl-2 of the
L-LS, H-LS and QC groups increased with time. Regarding the respective time
points, caspase-3 and Bax protein expression of the NC group was lowest, the L-LS
and QC groups were next lowest and the H-LS group was highest. Bcl-2 protein
expression of the NC group was highest, protein expression of the NC group was
next highest and the H-LS group was lowest. The difference was statistically
significant (P<0.05). In conclusion, the low-dose 800 nm semiconductor laser is
an effective treatment on skin blackheads and coarse pores, and promotes hair
follicle cell apoptosis without reducing the expression of PCNA.