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Effects of narrow-spectrum uvb treatment on skin immune cells and cytokines


Narrow-spectrum UVB (NB-UVB) is effective in the treatment of some skin diseases, but the mechanism of treatment is still unclear.Studies have shown that nb-uvb can effectively reduce the number of immune cells, inhibit the production of cytokines, and achieve the effect of treating some skin diseases.This article reviews the effects of NB-UVB on the expression of immune cells and cytokines in common skin diseases.

Ultraviolet radiation therapy is widely used in dermatology clinic, and the biological effects of different wavelengths of ultraviolet radiation are also different.In a narrow spectrum of the 311 ~ 313 nm wavelength UVB rays (narrowbandultraviolet – B., NBUVB) strong penetrability, skin erythema effect is small, not easy to burn the skin, and not easy to induce DNA mutations, is widely used for psoriasis, Vitiligo, atopische Dermatitis, skin T cell lymphoma, Juckreiz, compressed moss, seborrheic dermatitis and other difficult clinical healing skin diseases.So far, it is still unclear whether nb-uvb exerts local effect or overall systemic effect. Existing studies have shown that nb-uvb can effectively reduce the number of immune cells such as T cells and dendritic cells, inhibit the production of cytokines, and thus play a therapeutic role in skin diseases.In this article, NB-UVB mediated the expression of skin immune cells and cytokines, and promoted the treatment of skin diseases.

  1. Effects of NB-UVBon skin T lymphocytes

The etiology of some skin diseases such as vitiligo and psoriasis is unknown, but they are closely related to immunity. In the development process of these diseases, T lymphocytes are involved in the pathological process.Animal experiments and clinical treatments have found that activation of CD4+ and CD8+ cells is necessary for the occurrence and development of immune skin diseases, and both of them require interaction with dendritic cells.Most of the therapeutic effects of NB-UVB on skin diseases may be related to its immunosuppressive function.The experiment showed that the radiation intensity of 0.28 ~ 2J/cm2 nb-uvb, three times a week systemic treatment, can effectively inhibit the activation of CD4+ helper T cells in patients with vitiligo, but also promote the regulation of T cell activity, is conducive to the recovery of patients;NB-UVB irradiation twice a week combined with 0.1% tacrolimus for topical use is more effective in the treatment of segmental vitiligo.Comparative studies have shown that UVB with a wavelength of 312nm of 50-100mj /cm2 can better induce the apoptosis of T cells in psoriasis plaque than UVB with a wavelength of 290-320nm. Nach 1-2 weeks of irradiation, die therapeutische Wirkung von Psoriasis verbessert werden kann effektiv.

  1. Die Auswirkungen von NB-UVBon dendritischen Zellen

Dendritische Zelle (DC), eine leistungsfähigste professionelle Antigen-präsentierende Zelle (APC) im Immunsystem des Körpers, bei der Initiierung und die Immunantwort größte Merkmal der DC Regelung eine wichtige Rolle spielt, ist, dass es signifikant die Proliferation von primären T-Zellen und stellen Sie eine primäre Immun response.In die Behandlung von Hautkrankheiten, die durch nb-uvb vermittelten stimulieren kann, nb-uvb reduziert signifikant die Anzahl von CD11c + DCs, insbesondere cd1c-CD11c + “entzündliche” DCs, , um die klinische Wirkung von psoriasis.Erkin et al zu verbessern. auch festgestellt, dass die Anzahl der DCs zu reduzieren zusätzlich, nb-UV-B-Bestrahlung reduziert auch die Anzahl von anderen entzündlichen Zellen.

  1. Regulation der Immun Zytokine im peripheren Blut von NB-UVB

In normalen menschlichen Körper, Th1 und Th2-Balance jeden other.Many Studien haben gezeigt, dass das Ungleichgewicht von Th1 / Th2-Cytokin-Wechselwirkung zu Immunstörungen führen, which will result in the body’s inability to carry out effective cellular immune response, thus leading to or affecting the occurrence, development and outcome of a variety of diseases.

Wang zhongyong et al. found that the expression levels of Th2 cytokines il-4 and il-13 in peripheral blood serum of patients with atopic dermatitis (ANZEIGE) were significantly higher than that of normal people. After nb-uvb radiation treatment, the expression levels of il-4 and il-13 in peripheral blood serum were significantly reduced, while the expression levels of il-4 and il-13 in serum of patients with AD were not statistically significant.The above results show that nb-uvb can correct the imbalance of Th1/Th2 by inhibiting the expression of il-4 and il-13.Metwally et al. also showed that the level of il-13 in peripheral blood of AD patients was significantly higher than that of the normal control group, and its expression level was positively correlated with the severity of the disease and IgE level.

Walters et al. dass die Zahl der IL-12 und IFN-gamma im Blut signifikant nach nb-UVB-Bestrahlung reduziert wurde,, dass nb-UVB- anzeigt, kann die entzündliche Reaktion durch IL-12 und IFN-gamma-vermittelten Hemmung, und wahlweise die Freisetzung von proinflammatorischen Zytokinen durch T-Zellen in der Haut Verletzungsbereich reduzieren. Die Zunahme der IL-10-Sekretion in dem peripheren Blut von Patienten mit Vitiligo war statistisch signifikant im Vergleich zu der der normalen Kontrollgruppe. The presence of Th2 deviation indicated the imbalance of Th1/Th2.After nb-uvb irradiation, the level of il-10 was significantly reduced, suggesting that nb-uvb restored Th1/Th2 balance by affecting the secretion of il-10, achieving therapeutic effect.

In patients with hand eczema, the expression level of Th1 cytokines in peripheral blood serum was increased, while the expression level of Th2 cytokines was decreased. After nb-uvb radiation treatment, the expression level of inf-gamma was decreased and the level of il-4 was increased, was darauf hindeutet, dass das Ungleichgewicht von Th1 / Th2 tendenziell allmählich normal.

Die Expressionsniveaus von TNF- und IL-8 im Serum von Patienten mit Psoriasis vulgare waren signifikant höher als die in der normalen Kontrollgruppe. Die Expressionsniveaus von TNF- und IL-8 im Serum von Patienten mit Psoriasis vulgare wurden signifikant verringert, nachdem nb-UV-B-Bestrahlungsbehandlung, dass nb-UVB- anzeigt, kann die Expression von TNF hemmen,- und IL-8 im Serum von Patienten mit Psoriasis vulgare.The Expression von IFN- in serum of patients with psoriasis was also found to be higher than that of normal people.These results suggest that nb-uvb can reduce the amount of Th1 cytokines and correct the imbalance effect of Th1/Th2.

Two other CD4+T cell subsets have been identified in recent years :Th17 cells and Th22 cells.Th17 cells and Th22 cells play irreplaceable roles in inflammatory diseases and autoimmune diseases.Th17 cells mainly secrete il-17, il-22, il-17f, il-6, and Th17 cells produce a variety of pro-inflammatory cytokines and chemokines by secreting these effector molecules, which are involved in the immune response and inflammatory response of the body.Th22 cells mainly secrete il-22, which is involved in skin self-regulation.

The proportion of Th17 in peripheral blood monocytes of AD patients was significantly increased, and il-23 was the key cytokine in the production process of Th17 cells. After nb-uvb radiation treatment, the expression levels of Th17 and il-23 in patients were decreased.The results suggest that reducing the expression of Th17 cells and related cytokines may be one of the many immune mechanisms of nb-uvb irradiation in the treatment of AD.

  1. The regulatory effect of NB-UVBon peripheral blood chemokines and their receptors

Monocyte chemotactic protein (MCP) is the earliest cc-type chemotactic factor, and its family members are mainly 4, namely McP-1, McP-2, McP-3 and McP-4.

The expression level of McP-1 in peripheral blood serum of patients with psoriasis was higher than that of the healthy group, and the expression level of CCR2 in peripheral blood mononuclear cells was also higher than that of the healthy group, suggesting that the McP-1 /CCR2 pathway is involved in the pathogenesis of psoriasis.After nb-uvb radiation treatment, the expression levels of McP-1 and CCR2 were significantly reduced, blocking the McP-1 /CCR2 pathway, thereby inhibiting the infiltration of inflammatory cells to other places, preventing the release of inflammatory factors, and finally playing a role in the treatment of psoriasis.McP-4 is activated by binding to the specific receptor CCR2, thereby driving monocytes and T cells to play a role in the inflammatory response of psoriasis.After NB-UVB irradiation treatment, its expression level decreased significantly, which can delay the pathogenesis of psoriasis.

CCR1 is a high affinity receptor of RANTES and mip-1. Die Expression von CCR1 im peripheren Blut Neutrophile von Patienten mit Psoriasis erhöht, und der Ausdruck ist deutlich herunterreguliert nach nb-UVB-Strahlung Behandlung, und die Psoriasis-Läsionen sind auch deutlich reduced.These Ergebnisse deuten darauf hin, dass CCR1 in der Aktivierung und Chemotaxis von Neutrophilen bei Psoriasis beteiligt ist, sowie die Entzündungsreaktion an der Stelle der Verletzung der Haut. Die wirksame Behandlung von nb-uvb wird durch eine Verringerung der Expression dieses receptor.CCR2 erreicht, when combined with specific ligand MCP, can activate and chemotactic monocytes, T lymphocytes, etc.. and play a role in inflammatory diseases.CCR2 is highly expressed in peripheral blood lymphocytes of patients with psoriasis, and the expression of this receptor is significantly decreased after nb-uvb irradiation treatment, suggesting that CCR2 may be involved in the activation and chemotaxis of lymphocytes in psoriasis, leading to inflammatory reactions in the skin lesions of patients.NB-UVB plays a therapeutic role by inhibiting this receptor.

Interferon-induced T cell chemotactic factor (i-tac) belongs to CXC chemotactic factor and has strong chemotactic effect on T lymphocytes, especially Th1 cells.In patients with psoriasis vulgis, the level of i-tac in peripheral blood was significantly increased. After nb-uvb radiation treatment, the condition of patients was significantly improved, and the expression of i-tac in peripheral blood was also significantly decreased.This conclusion suggests that i-tac may be involved in the pathogenesis of psoriasis, and that i-tac and its receptor CXCR3 play an important role in the aggregation, infiltration and maintenance of T lymphocytes.

Yu Juan et al. conducted an in-depth study on RANTES in peripheral blood of patients with psoriasis.The results showed that the expression of RANTES in patientsperipheral blood was higher than that in the normal group, and the expression of RANTES in patientsperipheral blood was significantly reduced after nb-uvb radiation treatment, suggesting that RANTES may play a key role in the pathogenesis of psoriasis.As one of the most important chemotactic factors of T lymphocytes, RANTES is down-regulated by nb-uvb, which is likely to reduce the number of T lymphocytes chemotactic to the site of skin injury and reduce the inflammatory response in the site of skin injury.

  1. Fazit

There are more and more types of nb-uvb in the treatment of skin diseases, but it is relatively common in the clinical treatment of psoriasis, atopic dermatitis and vitiligo.Compared with traditional ultraviolet therapy, nb-uvb is more effective, but its therapeutic mechanism is still unclear. Many studies focus on the study of cells and related factors in skin lesions and peripheral blood. These studies show that nb-uvb not only plays a local effect on the skin lesions, but also can affect the overall system of the body.With the deepening of basic research, it is expected to reveal the mechanism of nb-uvb in the treatment of skin diseases and better apply it in clinical practice.

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