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2017 ; 8
(ä): 885
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The Superficial Dermis May Initiate Keloid Formation: Histological Analysis of
the Keloid Dermis at Different Depths
#MMPMID29163221
Jiao H
; Zhang T
; Fan J
; Xiao R
Front Physiol
2017[]; 8
(ä): 885
PMID29163221
show ga
Several studies have reported on certain aspects of the characteristics of
different sites within a keloid lesion, but detailed studies on the keloid dermis
at different depths within a keloid lesion are scarce. The aim of this study was
to investigate the histology of the keloid dermis at different depths. This study
included 19 keloid tissue samples that were collected from 19 patients and 19
normal skin samples, which were harvested from subjects without keloids or
hypertrophic scar. Samples were studied by light microscopy using routine
hematoxylin and eosin histochemical staining, and immunohistochemistry to detect
CD20-positive B-lymphocytes and CD3-positive T-lymphocytes. Sirius Red
histochemical staining was used to determine the type of collagen in keloid
tissue and normal skin samples. The migratory properties of fibroblasts within
the keloid dermis at different depths was compared, using an in vitro migration
assay. The findings of this study showed that although the papillary and
reticular dermis could be clearly distinguished in normal skin, three tissue
layers were identified in the keloid dermis. The superficial dermis of keloid was
characterized by active fibroblasts and lymphocytes; the middle dermis contained
dense extracellular matrix (ECM) with large numbers fibroblasts, and the deep
dermis was poorly cellular and characterized by hyalinized collagen bundles. In
the keloid samples, from the superficial to the deep dermis, type I collagen
increased and type III collagen decreased, and fibroblasts from the superficial
dermis of the keloid were found to migrate more rapidly. In conclusion, the
findings of this study showed that different depths within the keloid dermis
displayed different biological features. The superficial dermis may initiate
keloid formation, in which layer intralesional injection of pharmaceuticals and
other treatments should be performed for keloid.