Dermal defection and the degree of its loss determine the natural process of wound healing, which is the key reason leading to excess scar hyperplasia. The function of tri-dimensional structure in dermis acts as a template to regulate the properties of reparative cells. The template structure induces the reparative cells to grow into the structure which changes the skin mechanic status on wound area. Also, the component of extracellular matrix can affect behaviours of fibroblasts negatively or positively, for the reason that the structure of dermal tissue has a permissive effect on the dermal components in regulating behaviours of reparative cells. Therefore, the behaviors of cells depend on the structure of the template. The suitable tri-dimensional structure of dermis facilitates normal cell cycling. The more the structure of dermis closed to its physiological status, the better the biological behaviors of cells act. Moreover, the integrity as well as the continuity of dermal tissue is the prerequisite for serving as a template. The damage to the integrity and the continuity of dermal tissue may be one of the key reasons to lead abnormal tissue repair and scar formation. Thus, we hypothesize that the loss of dermal template may be one of the mechanism of abnormal scar formation and propose the theory of extracellular matrix framework deficiency or destruction.
Cicatrix ; pathology ; Dermis ; pathology ; Epidermis ; pathology ; Humans ; Wound Healing

Carcinoma, Squamous Cell ; diagnosis ; Carcinoma, Verrucous ; diagnosis ; Epidermis ; pathology ; Humans

We reported two cases of clinically typical melasma presenting with unusual histopathologic findings. In one case, the epidermal melanocytes were markedly increased in number and protruded into the dermis, and in the other case, increased epidermal pigmentation as well as dermal melanocytosis were found. We suggested that the various treatment modalities of melasma should be applied depend on its histopathologic finding.
Melanosis/*pathology ; Melanocytes/pathology ; Humans ; Female ; Epidermis/pathology ; Dermis/pathology ; Adult

Membranous lipodystrophy represents a peculiar type of fat necrosis that is present in patients with various types of skin disease. It is characterized by the presence of microcysts and macrocysts and is lined by amorphous eosinophilic material with a crenelated arabesque appearance. These findings have been associated with lupus erythematosus, diabetes mellitus, erythema nodosum, trauma, etc. We report a case of a 43-year-old woman who had a red to purple asymptomatic indurated plaque, approximately seven cm in diameter and on the left arm. She was a chronic hepatitis B antigen carrier and had hypertension for four years. Histopathology of the biopsied lesion showed transepidermal elimination of altered collagen and elastic fibers, as well as membranous lipodystrophy changes. There were hypertensive vascular changes including lymphohistiocytic infiltration around the vascular wall, swelling of endothelial cells, increased thickness of the vascular walls, and narrowing of the lumen. We report a case showing transepidermal elimination with membranous lipodystrophy. We carefully suggest that the secondary phenomenon of transepidermal elimination was associated with membranous lipodystrophy and degenerate connective tissues.
Skin Diseases/*pathology ; Lipodystrophy/*complications/*pathology ; Hypertension/*complications ; Humans ; Female ; Epidermis/*pathology ; Adult

This study was done to characterize the structural changes in the tretinoin pretreatment on trichloroacetic acid(TCA) chemical peel. In guinea pigs, the right halves pretreated with tretinoin and the left halves treated nothing were compared in their structural changes after TCA chemical peel. Epidermal thickness in the tretinoin pretreated group was almost the same in the first and second week. But epidermis of the TCA group increased continuously. In the first week, mitotic figures in the epidermis were more increased in the TCA group, but those in hair follicles were more increased in the tretinoin pretreated group. In the second week, mitotic figures in the epidermis were almost same in both group, but in hair follicles of the tretinoin pretreated group, mitotic figures were much more increased. In alcian blue staining, glycosaminoglycan was stained much more strongly in dermis of the TCA group in first week, but was more strongly stained in the tretinoin pretreated group in second week. On electron microscopic findings, the fibroblasts in upper dermis were larger and had plentier cytoplasm with more organelles in the tretinoin pretreated group. Conclusively, tretinoin pretreatment on TCA chemical peel sustained the effects of TCA longer and showed synergistic effects of TCA and induced enhanced wound healing.
Animal ; Epidermis/drug effects/pathology ; Guinea Pigs ; Skin/*drug effects/pathology ; Tretinoin/*pharmacology ; Trichloroacetic Acid/*pharmacology

To establish a simple and reliable animal model of skin photo-damage, 20 mice were treated with 8-MOP and exposed to UVA (UVA 320-400 nm) for 24 h. After irradiation, the structure of the epidermis and dermis, collagen fibers, elastic fibers were observed by using HE staining and Weigert technique and compared with the normal controls. The acanthosis and epidermis proliferation with accompanying hyperkeratosis and parakeratosis were observed. Inflammatory infiltration was noted in the dermis. The elastic fibers became coarse, irregularly arranged and clustered, with their number increased. The collagen fibers showed obvious degeneration and some amorphous materials could also be observed. The blood vessels were irregularly dilated and vascular walls were thickened, with infiltration of inflammatory cells. It is concluded that murine photodamage model can be quickly, conveniently and reliably established by means of 8-MOP/UVA.
Dermis/pathology ; Disease Models, Animal ; Epidermis/pathology ; Methoxsalen/*pharmacology ; Photosensitizing Agents/pharmacology ; Skin/*pathology ; Skin Aging ; Ultraviolet Rays

Epidermis ; pathology ; Humans ; Male ; Middle Aged ; Necrosis ; diagnosis ; Skin Diseases ; diagnosis

OBJECTIVETo investigate the Raman spectral characteristics of oral squamous cell carcinoma, high-grade epithelial dysplasia and normal mucosa.

METHODSFifty- six fresh samples of oral carcinoma, 50 of high-grade epithelial dysplasia and 32 of normal mucosa were collected. The i-Raman spectrometer with an optical fiber tube was applied to acquire Raman spectrum. The diagnostic model established by principle component analysis (PCA) and discriminant function analysis (DFA) was used to analyze and classify the spectra of different samples.

RESULTSThere were significant differences among the Raman spectra of these samples. Compared with the spectra of normal mucosa, the spectra of oral carcinoma and dysplasia showed strong peaks which were contributed to nucleic acids, proteins and lipids. The diagnostic models established by PCA-DFA could successfully classify these Raman spectra of different samples with a high accuracy of 96.4% (133/138). The model was evaluated by 'Leave one out' cross-validation and reached a high accuracy of 92.8% (128/138).

CONCLUSIONSThe proliferation and metabolism of oral squamous cell carcinoma and epithelial high-grade dysplasia are more active than normal mucosa. The diagnostic models established by PCA-DFA can classify these Raman spectra of different samples with a high accuracy.

Carcinoma, Squamous Cell ; chemistry ; pathology ; Discriminant Analysis ; Epidermis ; chemistry ; pathology ; Humans ; Mouth Mucosa ; chemistry ; Mouth Neoplasms ; chemistry ; pathology ; Mucous Membrane ; chemistry ; Principal Component Analysis ; Spectrum Analysis, Raman

OBJECTIVETo investigate the abnormalities of human epiderm in keloids and hypertrophic scars.

METHODSBiopsies from ten untreated keloids (duration of disease 3 - 30 years) and ten hypertrophic scars (duration of disease 6 - 10 months) and five normal adult skin specimens. Total RNA was isolated from normal adult skin. A cDNA fragment (base 5941 - 6481 bp) of the full-length human Tenascin-C cDNA was synthesized by polymerase chain reaction and subcloned in pGEM-T-easy. Dioxigen-labeled anti-sense and sense probes were synthesized by using a Sp6/T7 in vitro RNA synthesis kit in the present of Dig-UTP. In situ hybridization was performed on 4% paraformaldehyde-fixed and wax-embedded sections of keloids and hypertrophic scars. NBT-NCIP was used in color detection. Immunohistochemical procedure. The sections were incubated with antibodies (anti-Tenascin-C, anti-CK-16 and anti-Ki-67). Ultrasensitive Streptavidin Peroxidase staining was performed following established procedures.

RESULTSThe study show that the proliferation of epidermal keratinocytes in keloids and hypertrophic scars is very clear. The expressions of Tenascin-C mRNA in keloids epidermal keratinocytes markedly increased in contrast with epidermal keratinocytes of hypertrophic scars and adult skin. The CK-16 and Ki-67 stainings significantly enhanced in the epidermal keratinocytes of keloids and hypertrophic scars.

CONCLUSIONSThe different expressions of Tenascin-C, CK-16 and Ki-67 among normal adult skin, keloids and hypertrophic scars show the abnormalities of epidermal keratinocytes proliferation and differentiation in keloids and hypertrophic scars.

Cicatrix, Hypertrophic ; metabolism ; pathology ; Epidermis ; metabolism ; pathology ; Female ; Humans ; Hyperplasia ; Immunohistochemistry ; In Situ Hybridization ; Keloid ; metabolism ; pathology ; Keratins ; genetics ; metabolism ; Ki-67 Antigen ; genetics ; metabolism ; Male ; Tenascin ; genetics ; metabolism

Livedo vasculitis or vasculitis of atrophie blanche is a clinical entity which can be distinguished from cutaneous vasculitis by distinctive pathology and immunopathologic study. A 18-year-old female with erythematous, telangiectatic, purpuric or hyperpigmented patches, intermingled with white atrophic ivory patches on her legs of 3 years duration was seen in June 3, 1982. The histologic examination of an atrophic patch showed proliferation and occlusion of blood vessels in the upper dermis with patchy atrophy of the epidermis. The immunopatbologic features of an atrophic patch revealed deposits of IgM, Ca and fibrin as a definitive immunofluorescence vessel pattern. This suggests that the livedo va.sculitis or vasculitis of atrophie blanche may he considered one of the immune vasculitides. This patient had received aspirin and persantine for 4 months, and moderate therapeutic effects could be noticed.
Adolescent ; Aspirin ; Atrophy ; Blood Vessels ; Dermis ; Dipyridamole ; Epidermis ; Female ; Fibrin ; Fluorescent Antibody Technique ; Humans ; Immunoglobulin M ; Leg ; Pathology ; Vasculitis*