Biomedical subjects

Du-yin Jiang

Publications and source records attributed to Du-yin Jiang.

12 recordsLinked to original sources

PubMed2006

[Relationship between the proliferation and immunoinduction of epithelial cells and the destruction of hair follicles and sebaceous glands in keloids].

OBJECTIVE: To investigate the influence of biological behavior of epithelial cells on the hair follicles and sebaceous glands (HFSG) structure in keloids (K). METHODS: The expression of intercellular adhesion molecule (ICAM)-1, D-related human leucocyte antigen (HLA-DR), and cytokeratin (CK) 14 on epithelial cells and the amount of activity T-lymphocytes were detected in specimens of keloid edge and normal skin with immunohistochemical and histological methods. RESULTS: In comparison with normal skin specimens, epithelial cells were proliferated in K-HFSG presented structural aberration and disintegrate or abnormally to form solid-epithelial island-like structure, and the density of HSFG with hyperplasia and the ageing scar in keloids was apparently decreased. They strongly expressed ICAM-1, HLA-DR, and CK14 in the epithelial cells, there were many immunologic cells which expressed CD4, CD45RO, and interferon (IFN)-gamma around the K-HFSG. The expressed level of epithelial cells was positively correlated with the density of immunologic cells nearby K-HFSG. CONCLUSION: It could be concluded that the reactivity with hyperplasia and immunoinduction of epithelial cells might be associated with the destruction of the some HFSG structure in the keloids.

Adolescent↗

PubMed2005

[Investigation of mesenchymal-epithelial transdifferentiation in the morphogenesis mechanism of embryonic epidermic cells].

OBJECTIVE: To study the relationship between the morphologic mechanism of human embryonic epidermic cells and mesenchymal-epithelial transformation (MET) and its modulation factor. METHODS: Morphological occurrence of epidermis was detected with histologic methods in earlier period [estimated gestational age (EGA) 6-14 weeks] human embryonic skin samples. At the same time, the characteristic expression and their distribution markers of mesenchymal cells [vimentin and alpha-smooth muscle actin (alpha-SMA)], embryonic specific epidermic protein CK8&18, specific protein of epidermic stem cell CK19, transforming growth factor-beta1) (TGF-beta1) and its receptor (TGFbetaRI) in embryonic epidermis were examined with immunohistochemistry and indirect-immunofluorescent doble-labelling method. RESULTS: During EAG 6-8 weeks, ectodermal cells containing Vim+/alpha-SMA(-) were found to transform into epidermal stem cells with CK8&18+/CK19+. In ectodermal cells, protein expression density of TGFbetaRI was moderate (+ +), while positive signal of TGFbeta1 was weak (+/-). After EGA10 weeks, epidermal cells showed typical morphological characteristics. CONCLUSIONS: At EGA 6-8 weeks, human embryonic skin epidermal cells began to form through MET, in which the signal pathway mediated by TGFbetaRI might play important roles, but the role of TGFbeta1 need to be further studied.

Cell Differentiation↗

PubMed2004

[Relationship between epithelial-immunologic cells transdifferentiation and pseudoepitheliomatous granuloma lesion].

OBJECTIVE: Inappropriate treatment at early stage of wound could result in the formation of pseudoepitheliomatous granuloma (PEG). The correlation of abnormal transdifferentiation of epithelial cells to immunologic cells and the occurrence of PEG lesion was investigated. METHODS: Morphological change of epithelial tissue was observed with histopathology in 11 specimens of PEG lesions and 6 specimens of normal skins from PEG edge (PEG-N) from 11 patients with damaged skin. The expression characteristics and distribution of pan-cytokeratin (CKp), IV type collagen, laminin (LM), epithelial cadherin (E-Cad), beta-catenin (beta-Cat), focal adhesion kinase (FAK), stem cell factor (SCF) and its receptor-c-Kit, proliferating cell nuclear antigen(PCNA), and cluster of differentiation-14 (CD14), CD68 and mast cell tryptase (MCT) in PEG were detected with the immunohistochemical and the indirect immunofluorescent double-staining. RESULTS: In comparison with PEG-N, epithelial tissue take on squamous metaplasia, and stroma was infiltrated with intensive microvessels and inflammatory cells in the PEG lesion. Poor epithelial basal layer constitution, basal polarization, and migration of basal cells to stroma could be observed. In the ultrastructure, the loose intercellular junction of basal cells and the increased nucleus/cytoplasm ratio and intercellular space could be observed, neonatal monocytoid cells and macrophages and mast cells as a exuviate-like manner brooded from cytoplasm of original epithelial cells and basement membrane. protein expression of CKp and E-Cad by basal cells was significantly decreased, and the IV type collagen and LM protein could not be found in basement membrane of identical locus. By contrast, the immunoreactivity of beta-Cat and FAK was apparently increased. In addition, CD14(+) monocytes, CD68(+) macrophages, MCT(+) mast cells and CD68(+)/MCT(+) cells with various size, and these cells of stronger immuno-staining of SCF, c-Kit and PCNA antigen could be found in epithelial tissue and stroma. CONCLUSION: Epithelial cells in PEG related to wound are characteristized by transdifferentiation of epithelial cells to immunologic cells, wich may be associated with local infectious and inflammatory reaction, ultimately resulting in enhancement the ratio of beta-Cat/E-Cad signal and activation SCF-c-Kit signal pathway. The phenomena of transdifferentiation epithelial cells in the PEG lesion will help to recognize of the neoplatic immune and trauma repair mechanism.

Adolescent↗

PubMed2004

[Study of mechanism on loss of some components from basement membrane in epithelial-interstitial junction in cutaneous pseudoepitheliomatous hyperplasia lesion].

OBJECTIVE: To investigate the relationship between the formation of pseudoepitheliomatous hyperplasia (PEH) and the mechanism of loss of some components from the basement membrane in epithelial interstitial junction (EIJ) in the treatment of cutaneous wounds, when formation of PEH lesion was induced. METHODS: Morphological change in epithelial tissue was observed with histopathologic method and electronic microscopy in 11 specimens of PEH lesions and 6 specimens of normal skin adjacent to PEH (PEH-N) from 11 patients with injured skin. The expression characteristics and distribution of pan-cytokeratin (p-CK), matrix metalloproteinase-2 (MMP-2), MMP-3, MMP-9, proliferating cell nuclear antigen (PCNA), epithelial cadherin(E-Cad) and beta-catenin(beta-Cat) in EMJ were detected with immunohistochemical methods. RESULTS: Epithelial cells expressing P-CK presented squamous epithelialization and extended into deep layer of mesenchyma. In epithelium-mesenchyma junction, where IV type collagen and laminin were weakly expressed, the protein contents of p-CK, E-Cad, MMP-2, MMP-3 MMP-9 were decreased, whilst the immunochemical staining of beta-Cat and PCNA was apparently increased. In the junction, epithelial basal cells were observed to migrate and to depart from basal membrane; epithelial islands and isolated epithelial cells expressing p-CK in mesenchyma could be observed. Ultrastructural observation revealed deformation of epithelial basal cells, increment of nucleus/cytoplasm ratio, loosened intercellular junctions, decrement of electronic density of BM and derangement of BM structure could be observed. CONCLUSION: Reduction in the capability of epithelial basal cells adhesion, differentiation and formation of basement membrane and cytokeratin in PEH associated with wound may be the crucial cause which controls epithelial cells migration into mesenchyma. That the contents of ColIV and LN were decreased may not be associated with MMPs, but with enhancement of the ratio of beta-Cat/E-Cad signal might be the important mechanism of dedifferentiation of epithelial basal cells and the loss of ability of structure formation and cellular migration.

Basement Membrane↗

PubMed2004

[Expression characteristics of transforming growth factor-beta1 in human skin at different development stages of gestation].

OBJECTIVE: To investigate gene expression of transforming growth factor-beta(1) (TGF-beta(1)) and its two upstream signalling factors (smad2 and smad3) in fetal skin at different gestational ages and postnatal skin and its potential biological significance. METHODS: Fetal skin samples of human embryo were obtained from spontaneous abortions at different gestational ages ranging from 13 to 32 weeks, and also skin collected from patients undergoing plastic surgery. After morphological characteristics of skin at different developmental stages were examined histologically, gene expressions of TGF-beta(1), smad2 and smad3 in skin specimens at different developmental stages were examined with reverse transcription-polymerase chain reaction analysis (RT-PCR). RESULTS: Gene expression of TGF-beta(1), smad2 and smad3 could all be detected in fetal skin and skin after birth. In skin from early gestational fetus, gene expressions of TGF-beta(1) and smad2 were weak. Along with advance in gestational age, gene expression of these two genes in skin became progressively stronger. In skin from late gestational fetus and skin after birth, the transcription contents of these two genes were significantly increased compared with early gestation fetus (P<0.05). On the contrary, gene expression of smad3 was apparently higher in younger fetal skin versus elder compared with that of late fetal skin (P<0.05). In skins after birth, the levels of smad3 gene expression were elevated to the level similar to that in early gestational fetal skin. CONCLUSION: The signal pathway mediated by TGF-beta(1) might be involved in regulating development of the skin at embryonic stage and in designating cetaceous structure and function, and also in wound healing after birth. The relative lack in expression of TGF-beta(1) and smad2 genes in skins from younger fetuses might contribute to fetal scar-less healing, in which the role of smad3 needs to be further investigated.

Actins↗

PubMed2004

[Analysis of etiological factors of pseudo-epitheliomatous granuloma after cutaneous wound healing: a report of 11 cases of patients with this lesion].

OBJECTIVE: To explore the pathogenetic mechanism, clinical and pathological characteristics, and prevention and treatment of pseudo-epitheliomatous granuloma after skin wound healing. METHODS: The clinical information and the treatment results of pseudo-epitheliomatous granuloma occurring in 11 patients (age 1-67 years) were reviewed and analyzed, their tissue specimens were used for microbial examination and histological observation. RESULTS: Some bacteria such as Staphylococcus aureus, Pseudomonas aeruginosa, Streptococcus hemolyticus B, and Streptococcus faecalis could be found in the culture of pseudo-epitheliomatous granuloma. The maJority of these bacteria was tolerant to celbenin but sensitive to vancomycin. The lesions were excised, and the wounds were covered with skin grafting or skin flap, supplemented by local of vancomycin to prevent recurrence of the lesion. Histological examination revealed in pseudo-epitheliomatous granuloma with long epithelial peduncle encapsulating granulation tissue like honeycomb, in which there were many capillaries, macrophages, lymphocytes and mast cells, with only a small amount of extracellular matrix. CONCLUSION: The main pathogenesis of pseudo-epitheliomatous granuloma formation might be improper treatment of wound in earlier period and infection of drug resistant bacteria. Surgical debridement followed by skin coverage and local inJection of vancomycin could be effective and curative.

Adolescent↗

PubMed2004

[Relationship of overexpression of angiogenesis factors and their receptors with invasive growth of keloid].

OBJECTIVE: To study the relationship between invasive growth and the angiogenesis factors and their receptors in keloid. METHODS: Biopsies from 17 keloid (Ke) were divided into atrophy group (Ke-A, n = 9), proliferating group (Ke-P, n = 13), infiltrating group (Ke-I, n = 9), normal skin around Ke (Ke-N, n = 10) and normal skin (NS, n = 10). The histology, immunohistochemistry and computerized imaging analysis were used for the study. The levels of basic fibroblast growth factor (bFGF) and its receptor-Flg, vascular endothelial growth factor (VEGF) and VEGF/KDR complex (11B5), and platelet derived growth factor (PDGF-A) and its receptor-PDGFR-alpha, and alpha-smooth muscle actin (alpha-SMA) were determined in specimens with immuneohistochemical staining. RESULTS: In all 5 groups, bFGF, Flg, VEGF, 11B5, PDGF-A, and PDGFR-alpha were all expressed in fibroblasts (Fb), monocyte-phagocytes, vascular endothelial cells, adventitial cells, epidermal (cells and epithelial cells in appendage. The intensities of staining ranked as follows: Ke-I > Ke-N approximately equal to Ke-P > Ke-A approximately equal to NS, Flg > hFGF approximately equal to PDGFR-alpha > PDGF-A approximately equal to 11B5 > VEGF (P < 0.05 to approximately 0.01). 11B5 and VEGF were expressed (intensively in alpha-SMA positive myofibroblasts only in Ke-I group. The histological observation showed hyperplasia of endothelial cells and obliteration of microvessels. CONCLUSION: The invasive growth of keloid may be related to the overexpression of angiogenesis factors and their receptors. The abnormal expression of 11B5 in myofibroblasts may be one of the important factors associated with tumor-like growth feature in the invasive parts sites of keloid. The results suggest that inhibition of these biological activities would be of significance in clinical therapy.

Adolescent↗

PubMed2004

[Gene expression of extracellular-signal regulated protein kinase 5 and their MAPKK in fetal skin hypertrophic scars].

OBJECTIVE: To explore the change of gene expression of extracellular-signal regulated protein kinase 5 (ERK5) and its upstream signaling molecule (MEK5) in fetal skin of differentially developmental stages and hypertrophic scars. METHODS: After morphological characteristics of skin of different developmental stages and hypertrophic scars were detected with pathological methods, gene expression of ERK5 and MEK5 was examined with reverse transcription-polymerase chain reaction analysis (RT-PCR). RESULTS: In early gestational fetal skin, genes of ERK5 and MEK5 were strongly expressed, while in late gestational skin and children skin, the expression of ERK5 and MEK5 was apparently decreased (P < 0.05). In normal skin, the level of gene expression of ERK5 was lower. In proliferative hypertrophic scars, mRNA content of this gene was apparently increased. In mature scars, the content of this gene transcript was 3.2 times the normal skin. In contrast, the levels of MEK5 transcript in normal skin and hypertrophic scars of various phases showed no substantial changes (P > 0.05). CONCLUSION: ERKS medicating signaling pathway might be involved in regulating cutaneous development at the embryonic stage and determining cutaneous structure ad function. The increase of gene transcription of ERK5 and MEK5 in younger fetal skin might be a reason for rapid proliferation of the skin cells and scraless healing of skin. The activation of ERK5 gene expression in hypertrophic scars versus normal skin might be one of the mechanisms controlling the formation of hypertrophic scars, in which the role of MEK5 needed to be further studied.

Child↗

PubMed2004

[Experimental study and clinical application of composite skin grafting].

OBJECTIVE: To explore an ideal skin substitute with its appearance and texture similar to normal skin, to repair wounds with full-thickness skin defect. METHODS: Composite skin (CS) in question was composed of allo/xenogeneic acellular dermal matrix (ADM) and razor thin autoskin. One step skin grafting was employed in the experimental study and clinical trial. Razor thin autoskin alone was used as the control in the study. Changes in the antigenicity of ADM and the reformation of basement membrane (BM) structure at epidermis-dermis junction (EDJ) of ADMs were studied at designated time points after the grafting with biochemical and immunohistochemical methods. Fifty-three patients with full thickness skin defects due to various causes, including scar excision were grafted with CS, and survival rate and long-term result were observed. RESULTS: The grafted CS survived satisfactory. The reformation of the basement membrane structure was clearly observed at the 28th post-graft week. The basement membrane cells grew with polarization in an undulating arrangement. There was reformation of dermal papillae and ridges. The antigenicity of allo-ADM was obviously lower than that of xeno-ADM. Sixty-five out of 70 pieces of CS grafting (92.9%) survived totally, two of them survived partially, and three failed due to infection. The longest follow-up period was 8 and a half years. The grafted CS appeared similar to the normal skin in regard to the texture and color, especially allo-ADM, and no evident rejection reaction was seen. CONCLUSION: ADM possessed very low antigenicity, thus serving a lasting framework after grafting. In addition, it could serve as a "dermal template" for the induction of tissue regeneration.

Animals↗

PubMed2003

[An experimental study on the difference of the antigenicity of xenogenic acellular dermal matrix].

OBJECTIVE: To investigate the difference of the antigenicity of xenogenic acellular dermal matrix (ADM) implants prepared by different methods. METHODS: The split-thickness skin sheet from swine was processed by trypsin and Triton X-100 to make xeno-ADM. Twenty-five Japanese white rabbits were divided into 5 groups, i.e. xeno-ADM(1) (conjugated with glutaraldehyde), xeno-ADM(2) (conjugated with network) and xeno-ADM(3) (no conjugation, as control), in which the ADMs were and xeno-ADM(4) (conjugated) and allo-ADM (no conjugated as control), in which the ADMs were embedded into the subcutaneous place of rabbit ear and back after that the rabbits were pre-sensitized by xeno-ADM soluble protein antigen injections. The titers of anti ADMs antibody in rabbit serum were monitored during 2 - 32 post-operative weeks and the histological changes of the embedded ADMs were observed grossly and microscopically. RESULTS: The serum titers of anti-xeno-ADM in xeno-ADM(4) group was the highest. Whereas regardless of the sensitizing effects, the titers in all groups ranged as follows: xeno-ADM(3) > xeno-ADM(2) > xeno-ADM(1) (P < 0.05 - 0.01). About 40% serum samples in allo-ADM group exhibited positive anti-allo-ADM protein antibodies. Histologically, Evident and lasting inflammatory reaction could be found in the xeno-ADM grafting sites, which was much stronger than that in allo-ADM group. The degradation and absorption gradient of ADM was ranked as follow: xeno-ADM(3) > xeno-ADM(2) > xeno-ADM(4) > xeno-ADM(1) > Allo-ADM. Foreign body megalocytic reaction might evoke in the surrounding of conjugated ADM. CONCLUSION: The immunogenicity in xeno-ADM was stronger than that in allo-ADM, which could induce the host to develop immune reaction restricted by IgG. Large sheets of degenerated ADM implants could lower down the antigen-antibody reaction and ameliorate the structural destroying and degeneration absorption of ADM induced by inflammatory immune reaction.

Animals↗

PubMed2003

[Clinical significance of detection of serum hyaluronic acid concentration in severe burn patients].

OBJECTIVE: To study the relationship between the changes in serum hyaluronic acid (HA) concentrations and injury of hepatocytes in severe burn patients. METHODS: Radioimmunoassay and enzyme-linked immunosorbent assay (ELISA) were used to detect HA and tumor necrosis factor-alpha(TNF-alpha) concentrations in serum, and biochemical indexes for hepatic function and renal function in burn patients that were divided into different groups: systemic inflammatory response syndrome(SIRS), multiple organ dysfunction syndrome(MODS). Multiple organ failure(MOF) and non-surviving patient groups. RESULTS: In two weeks after burns, the serum HA concentration attained a high level. With the increase of severity of disease, the values of the serum HA concentration were elevated progressively (P<0.001). At the onset of MOF till death, the serum HA content was rapidly decreased. Lineal correlation analysis indicated that the change in the serum HA concentration was closely correlated with SIRS, burn sepsis, MODS and death (P<0.01). It was positively correlated with TNF-alpha, aspartate aminotransferase (AST) and total bilirubin (P<0.05 or P<0.01), and negatively correlated with plasma albumin and albumin/globulin(both P<0.05). CONCLUSION: The increment in serum HA levels is relate with the impairment of the hepatic endothelial cells due to TNF-alpha etc. The HA content in serum can be used as a sensitive indicator for judging injury of liver, seriousness of the injury, and prognosis of the patient.

Adult↗

PubMed2003

[Clinical study on the immunoregulation effects of cytokines on the acellular xenogenic dermal matrix].

OBJECTIVE: To investigate the relationship between some cytokines and early outcome of grafts in burn patients receiving xeno-/allo-ADM grafting. METHODS: Nineteen xeno-ADMs were grafted onto the wounds of 12 patients after escharectomy in extremities, and 18 allo-ADMs were grafted onto the escharectomy wounds of 15 patients in extremities. All the grafts were covered with thin split thickness skin autografts. Six patients grafted with split thickness skin autografts (auto-TTS) were employed as control. After the grafts survived for 4 to 8 weeks, immunohistochemistry and ELISA methods were employed to determine the contents of IL-1 beta, IL-4, IL-6, TNF-alpha and IFN-gamma in the exudation fluid from wounds after the rejection of xeno-ADM, local skin and peripheral blood. RESULTS: It was exhibited by immunochemistry staining that the positive cellular density and staining intensity of the IL-1 beta, IL-4, IL-6, TNF-alpha and IFN-gamma in the grafts were ranked as following: Xeno-ADM > allo-ADM > auto-TTS (P < 0.05 - 0.01). The levels of IL-4, IL-6, TNF-alpha and IFN-gamma in the exudation fluid during the rejection of xeno-ADM were obviously higher than those in the blood of the patients as determined by ELISA, while the serum levels of IL-4 and IFN-gamma in xeno-ADM group were lower and higher than those in xeno-ADM when without rejection respectively. The serum levels of IL-4, TNF-alpha and IFN-gamma in xeno-ADM group were significantly higher than those in allo-ADM and auto-TTS groups (P < 0.05 - 0.01). CONCLUSION: Local detection of high levels of IL-1 beta, IL-4, IL-6, TNF-alpha and IFN-gamma might be related to the immune augmentation mediated by cytotoxic lymphocytes and cytokines. The dynamic changes of these cytokines might be helpful to the explanation of the bad outcome of xeno-ADMs.

Animals↗