DNA methylation of ITGB2 contributes to allopurinol hypersensitivity.

BACKGROUNDS: HLA-B*58:01 allele was strongly associated with allopurinol induced severe cutaneous adverse drug reaction (SCAR). However, HLA-B genotype is not sufficient to predict the occurrence of allopurinol-induced SCAR. OBJECTIVE: To discover DNA methylation markers for allopurinol-induced SCAR which may improve the prediction accuracy of genetic testing. STUDY DESIGN: The study was designed as a retrospective case-control clinical study in multicenter hospitals across Taiwan, Mainland China, Malaysia and Canada. 125 cases of allopurinol-induced SCAR patients and 139 cases of allopurinol tolerant controls were enrolled in this study during 2005 to 2021. RESULTS: The results of genome-wide DNA methylation assay of 62 patients revealed that ITGB2 showed strong discriminative ability of allopurinol-induced SCAR in both HLA-B*58:01 positive and negative patients with AUC value of 0.9364 (95% CI 0.8682-1.000). In validation study, significant hypermethylation of ITGB2 were further validated in allopurinol-induced SCAR patients compared to tolerant controls, especially in those without HLA-B*58:01(AUC value of 0.8814 (95% CI 0.7121-1.000)). Additionally, the methylation levels of 2 sites on ITGB2 were associated with SCAR phenotypes. Combination of HLA-B*58:01 genotyping and ITGB2 methylation status could improve the prediction accuracy of allopurinol-induced SCAR with the AUC value up to 0.9387 (95% CI 0.9089-0.9684), while the AUC value of HLA-B*58:01 genotyping alone was 0.8557 (95% CI 0.8030-0.9083). CONCLUSIONS: Our study uncovers differentially methylated genes between allopurinol-induced SCAR patients and tolerant controls with positive or negative HLA-B*58:01 allele and provides the novel epigenetic marker that improves the prediction accuracy of genetic testing for prevention of allopurinol-induced SCAR.

Serum miRNA-371b-5p and miRNA-5100 act as biomarkers for systemic lupus erythematosus.

MicroRNAs (miRNAs) play important roles in the pathogenesis of systemic lupus erythematosus (SLE). Here, we investigated the serum miRNAs expression profiles in the serum of SLE and healthy controls, and identified the potential serum biomarkers for SLE. We screened and identified the differentially expressed miRNAs such as miR-371b-5p, miR-5100, miR-146a-5p among active SLE, inactive SLE and healthy controls based on the miRNAs expression array. Furthermore, the results of RT-qPCR confirmed that miR-371b-5p and miR-5100 expression was different among active SLE, inactive SLE and healthy controls. Moreover, we performed in a large cohort which we validated that expression of miR-371b-5p and miR-5100 was increased significantly in the serum of SLE compared with healthy controls and rheumatoid arthritis (RA), and was also higher in active SLE than that in inactive SLE. In addition, we found the associations between the expression levels of miR-371b-5p and miR-5100 and these clinical parameters of SLE. These results suggested that miR-371b-5p and miR-5100 may act as serum biomarkers for SLE.

Downregulation of BDH2 modulates iron homeostasis and promotes DNA demethylation in CD4+ T cells of systemic lupus erythematosus.

DNA hypomethylation plays an important role in the pathogenesis of systemic lupus erythematosus (SLE). Here we investigated whether 3-hydroxy butyrate dehydrogenase 2 (BDH2), a modulator of intracellular iron homeostasis, was involved in regulating DNA hypomethylation and hyper-hydroxymethylation in lupus CD4+ T cells. Our results showed that BDH2 expression was decreased, intracellular iron was increased, global DNA hydroxymethylation level was elevated, while methylation level was reduced in lupus CD4+ T cells compared with healthy controls. The decreased BDH2 contributed to DNA hyper-hydroxymethylation and hypomethylation via increasing intracellular iron in CD4+ T cells, which led to overexpression of immune related genes. Moreover, we showed that BDH2 was the target gene of miR-21. miR-21 promoted DNA demethylation in CD4+ T cells through inhibiting BDH2 expression. Our data demonstrated that the dysregulation of iron homeostasis in CD4+ T cells induced by BDH2 deficiency contributes to DNA demethylation and self-reactive T cells in SLE.

Up-regulation of microRNA-210 induces immune dysfunction via targeting FOXP3 in CD4(+) T cells of psoriasis vulgaris.

Psoriasis vulgaris (PV) is a chronic inflammatory and T cell-mediated autoimmune skin disease. An immune dysfunction that is manifested by abnormally activated T cells and defective regulatory T (Treg) cells may play an important role in the pathogenesis of PV. However, the precise mechanism of the immune dysfunction in PV patients still remains unclear. In this study, we found that miR-210 expression is increased significantly in CD4(+) T cells from patients with PV and confirmed that FOXP3 is a target gene of miR-210. We also found that overexpression of miR-210 inhibits FOXP3 expression and impairs the immunosuppressive functions of Treg cells in CD4(+) T cells from healthy controls. In contrast, inhibition of miR-210 increases FOXP3 expression and reverses the immune dysfunction in CD4(+) T cells from patients with PV. Our data demonstrates that increased miR-210 induces immune dysfunction via by FOXP3 in CD4(+) T cells from patients with PV.

Total glucosides of paeony induces regulatory CD4(+)CD25(+) T cells by increasing Foxp3 demethylation in lupus CD4(+) T cells.

Total glucosides of paeony (TGP), an active compound extracted from Paeony root, has been used in therapy for autoimmune diseases. However the molecular mechanism of TGP in the prevention of autoimmune response remains unclear. In this study, we found that TGP treatment significantly increased the percentage and number of Treg cells in lupus CD4(+) T cells. Further investigation revealed that treatment with TGP increased the expression of Foxp3 in lupus CD4(+) T cells by down-regulating Foxp3 promoter methylation levels. However, we couldn't observe similar results in healthy control CD4(+) T cells treated by TGP. Moreover, our results also showed that IFN-γ and IL-2 expression was enhanced in TGP-treated lupus CD4(+) T cells. These findings indicate that TGP inhibits autoimmunity in SLE patients possibly by inducing Treg cell differentiation, which may in turn be due to its ability to regulate the methylation status of the Foxp3 promoter and activate IFN-γ and IL-2 signaling.

[Histone H3 acetylation of tumor necrosis factor-alpha and cyclooxygenase-2 in patients with type 2 diabetes].

OBJECTIVE: To investigate the expression of tumor necrosis factor-alpha (TNF-α) and cyclooxygenase-2 (COX-2) mRNA and evaluate the status of histone H3 acetylation at TNF-α and COX-2 promoter in peripheral blood mononuclear cells (PBMCs) from type 2 diabetics. METHODS: The PBMCs from 12 type 2 diabetics and 12 healthy controls were isolated by Ficoll-Hypaque density gradient centrifugation. The differential expression of TNF-α and COX-2 mRNA was measured by real-time PCR (polymerase chain reaction). Chromatin immunoprecipitation analysis was used to detect the status of H3 acetylation at TNF-α and COX-2 promoter region. RESULTS: TNF-α and COX-2 mRNA were overexpressed in PBMCs from Type 2 diabetics as compared with normal controls (2.28 ± 0.09 fold and 2.78 ± 0.26 fold).(P < 0.05). Compared with normal controls, H3 acetylation at the TNF-α (1.54 ± 0.43 vs 0.97 ± 0.39, P = 0.0094) and COX-2 (1.20 ± 0.58 vs 0.64 ± 0.21, P = 0.0161) gene promoter region was elevated in PBMCs from Type 2 diabetic patients. CONCLUSION: Increased H3 acetylation at TNF-α and COX-2 promoter in PBMCs from type 2 diabetics may contribute to the pathogenesis of type 2 diabetes through the elevated expressions of TNF-α and COX-2.

Consensus on Pre-examination and Triage in Clinic of Dermatology During Outbreak of COVID-19 From Chinese Experts.

The 2019 novel coronavirus infection has brought a great challenge in prevention and control of the national epidemic of coronavirus disease 2019 (COVID-19) in China. During the fight against the epidemic of COVID-19, properly carrying out pre-examination and triage for patients with skin lesions and fever has been a practical problem encountered in hospitals for skin diseases as well as clinics of dermatology in general hospitals. Considering that certain skin diseases may have symptom of fever, and some of the carriers of 2019 novel coronavirus and patients with COVID-19 at their early stage may do not present any symptoms of COVID-19, to properly deal with the visitors to clinics of dermatology, the Chinese Society of Dermatology organized experts to formulate the principles and procedures for pre-examination and triage of visitors to clinics of dermatology during the epidemic of COVID-19.

A double-blind, randomized, placebo- and positive-controlled phase III trial of 1% benvitimod cream in mild-to-moderate plaque psoriasis.

BACKGROUND: Benvitimod cream, a novel synthetic small molecule, was effective in treating mild-to-moderate plaque psoriasis. We conducted a phase III clinical trial to assess the efficacy and safety of benvitimod cream in patients with mild-to-moderate plaque psoriasis. METHODS: We randomly assigned 686 patients (2:1:1) to receive 1% benvitimod cream, 0.005% calcipotriol ointment or placebo twice a day for 12 weeks. The primary efficacy end points were the percentage of patients with a 75% or greater reduction from baseline in the psoriasis area and severity index (PASI 75) score and with a score of 0 or 1 in static physician's global assessment (sPGA) at week 12. RESULTS: The results showed that 50.4% of patients in the benvitimod group achieved PASI 75, which was significantly higher than that in the calcipotriol (38.5%, P < 0.05) and placebo (13.9%, P < 0.05) groups. The proportion of patients achieving an sPGA score 0 or 1 was 66.3% in the benvitimod group and 63.9% in the calcipotriol group, which were both significantly higher than that in the placebo group (34%, P < 0.05). In the long-term follow-up study, 50.8% of patients experienced recurrence. After retreatment with 1% benvitimod, 73.3% of patients achieved an sPGA score of 0 or 1 again at week 52. Adverse events included application site irritation, follicular papules, and contact dermatitis. No systemic adverse reactions were reported. CONCLUSION: During this 12-week study, benvitimod cream was demonstrated with high effectiveness and safety in patients with mild-to-moderate plaque psoriasis. TRIAL REGISTRATION: Chinese Clinical Trial Registry (ChiCTR), ChiCTR-TRC-13003259; http://www.chictr.org.cn/showprojen.aspx?proj=6300.

Efficacy and safety of Run Zao Zhi Yang capsule on chronic eczema: a multiple-center, randomized, double-blind, placebo-controlled clinical study.

Background: Run Zao Zhi Yang capsule (RZZYC) has been widely applied for eczema treatment as a traditional Chinese medicine, while its efficacy has not been scientifically investigated. Objective: We conducted this multiple-centers, randomized, double-blind, placebo-controlled study to investigate the effectiveness and safety of RZZYC on the treatment of patients with mild to moderate chronic eczema. Methods: 240 patients were randomly assigned into the experimental group and the placebo group. The primary efficacy indicator was the Eczama Area and Severity Index (EASI) score at week 4. The patient with an EASI score that decreases more than 95% from baseline (EASI 95) was judged as cured. The cured patients were followed up for another 8 weeks. The differences on EASI, Visual Analogue Score (VAS), and Dermatology Life Quality Index (DLQI) score were compared. Results: The proportions of EASI 95 and EASI 60 in the experimental group were significantly higher than those of the control group at week4 (p = .002 and p < .001, respectively), the VAS score decreased more significantly in the experimental group at week 4. After 8 weeks follow-up, no difference on recurrence rate and adverse event rate between the two groups was observed. Conclusion: RZZYC provides a good effect on the treatment of mild-to-moderate chronic eczema with a low recurrence and tolerable adverse events, and is a potential treatment that may be implemented in clinical practice.

[Effects of 5-azaC on methylation pattern of the perforin promoter of the perforin gene in normal human T cells].

OBJECTIVE: To investigate the effects of DNA hypomethylation on mRNA and protein expression of perforin promotor in T cells. METHODS: T cells were isolated from the peripheral venous blood of healthy donors by density gradient centrifugation. CD4(+) and CD8(+) subsets were isolated using Miltenyi beads and protocols provided by the manufacturer. Where indicated the T cells were stimulated with PHA for 24 h, then treated with 5-azaC for an additional 72 h. Genomic DNA, mRNA, and protein were isolated from untreated and 5-azaC-treated T cells. Purified DNA was treated with sodium bisulfite, the desired sequences were amplified in sequential fragments using nested PCR. The amplified fragments were cloned into bacteria DH5 alpha and 5 independent clones for each of the amplified fragments were sequenced. The expression of perforin was determined using real time RT-PCR and Western blot. RESULTS: The perforin mRNA and protein in the CD4(+) and CD8(+) subsets treated with 5-azaC were significantly higher than those in the untreated subsets (P<0.05). The results of bisulfite genomic sequencing showed that the methylation of perforin promotor was significantly reduced in the treated cells compared with the untreated cells (P<0.05). CONCLUSION: The mRNA and protein expression of perforin significantly increases in the CD4(+) and CD8(+) T cells treated with 5-azaC,which is associated with DNA hypomethylation of perforin promoter in T cells.

Clinical Features of Adult/Adolescent Atopic Dermatitis and Chinese Criteria for Atopic Dermatitis.

BACKGROUND: Atopic dermatitis (AD) is an inflammatory skin disease characterized by chronic recurrent dermatitis with profound itching. Most patients have personal and/or family history of atopic diseases. Several criteria have been proposed for the diagnosis of AD. Although the clinical features of childhood AD have been widely studied, there has been less large-scale study on adult/adolescent AD. The aim of this study was to investigate the clinical features of adult/adolescent patients with chronic symmetrical eczema/AD and to propose Chinese diagnostic criteria for adult/adolescent AD. METHODS: A hospital-based study was performed. Forty-two dermatological centers participated in this study. Adult and adolescent patients (12 years and over) with chronic symmetrical eczema or AD were included in this study. Questionnaires were completed by both patients and investigators. The valid questionnaires were analyzed using EpiData 3.1 and SPSS 17.0 software. RESULTS: A total of 2662 valid questionnaires were collected (1369 male and 1293 female). Of all 2662 patients, 2062 (77.5%) patients had the disease after 12 years old, while only 600 (22.5%) patients had the disease before 12 years old, suggesting late-onset eczema/AD is common. Two thousand one hundred and thirty-nine (80.4%) patients had the disease for more than 6 months. One thousand one hundred and forty-four (43.0%) patients had a personal and/or family history of atopic diseases. One thousand five hundred and forty-eight (58.2%) patients had an elevated total serum IgE and/or eosinophilia and/or positive allergen-specific IgE. Based on these clinical and laboratory features, we proposed Chinese criteria for adult/adolescent AD. Of all 2662 patients, 60.3% were satisfied with our criteria, while only 48.2% satisfied with Hanifin Rajka criteria and 32.7% satisfied with Williams criteria, suggesting a good sensitivity of our criteria in adult/adolescent AD patients. CONCLUSION: Late-onset of eczema or AD is common. The clinical manifestations of AD are heterogeneous. We have proposed Chinese diagnostic criteria for adolescent and adult AD, which are simple and sensitive for diagnosis of adult/adolescent AD.

Two new susceptibility loci 1q24.2 and 11p11.2 confer risk to severe acne.

Severe acne is a chronic inflammatory skin disorder characterized by widespread inflammatory lesions including nodules, cysts and potential scarring. Here we perform the first genome-wide association study of severe acne in a Chinese Han population comprising 1,056 cases and 1,056 controls using the Illumina HumanOmniZhongHua-8 BeadChip. In an independent cohort of 1,860 cases and 3,660 controls of Chinese Han, we replicate 101 SNPs of which 3 showed consistent association. We identify two new susceptibility loci at 11p11.2 (DDB2, rs747650, P(combined)=4.41 × 10⁻9 and rs1060573, P(combined)=1.28 × 10⁻8) and 1q24.2 (SELL, rs7531806, P(combined)=1.20 × 10⁻8) that are involved in androgen metabolism, inflammation processes and scar formation in severe acne. These results point to new genetic susceptibility factors and suggest several new biological pathways related to severe acne.

Retinoic acids exhibit anti-fibrotic activity through the inhibition of 5-lipoxygenase expression in scleroderma fibroblasts.

The pathogenesis of systemic sclerosis (SSc) is not fully understood and there is no effective treatment for this disease. Retinoic acid (RA) can modulate connective tissue metabolism, exhibit anti-fibrotic activity, and improve the clinical symptoms of SSc. However, the mechanisms by which RA elicits its anti-fibrotic actions remain to be determined. The aim of this study was to elucidate the underlying mechanisms by which RA exerts beneficial effects on scleroderma. Cultured skin fibroblasts from patients with scleroderma were treated with RA and their effect on the expression of 5-lipoxygenase (LOX), transforming growth factor (TGF)-ß1, connective tissue growth factor (CTGF), type I and type III collagen was tested by reverse transcription polymerase chain reaction (RT-PCR) and western immunoblotting. The effect of MK886, a 5-LOX-specific inhibitor, on the expression of TGF-ß1, CTGF, type I and type III collagen was also examined by RT-PCR. In cultured scleroderma fibroblasts, the expression of 5-LOX was elevated compared with normal human dermal fibroblasts. RA significantly inhibited the expression of 5-LOX and of TGF-ß1, CTGF, type I and type III collagen. We further found that the expression of TGF-ß1, CTGF and type I and type III collagen mRNA was inhibited by MK886 in scleroderma fibroblasts. In vitro, RA reduced 5-LOX expression in scleroderma fibroblasts and downregulated TGF-ß1 and CTGF expression, leading to the inhibition of type I and type III collagen synthesis. Our results indicate that the clinical effects of RA on scleroderma are, at least in part, attributable to the reduction of 5-LOX expression and the subsequent suppression of TGF-ß1 and CTGF expression that results in the blockade of collagenogenesis.

Genome-wide association study in a Chinese Han population identifies nine new susceptibility loci for systemic lupus erythematosus.

We performed a genome-wide association study (GWAS) of systemic lupus erythematosus (SLE) in a Chinese Han population by genotyping 1,047 cases and 1,205 controls using Illumina Human610-Quad BeadChips and replicating 78 SNPs in two additional cohorts (3,152 cases and 7,050 controls). We identified nine new susceptibility loci (ETS1, IKZF1, RASGRP3, SLC15A4, TNIP1, 7q11.23, 10q11.22, 11q23.3 and 16p11.2; 1.77 x 10(-25) < or = P(combined) < or = 2.77 x 10(-8)) and confirmed seven previously reported loci (BLK, IRF5, STAT4, TNFAIP3, TNFSF4, 6q21 and 22q11.21; 5.17 x 10(-42) < or = P(combined) < or = 5.18 x 10(-12)). Comparison with previous GWAS findings highlighted the genetic heterogeneity of SLE susceptibility between Chinese Han and European populations. This study not only advances our understanding of the genetic basis of SLE but also highlights the value of performing GWAS in diverse ancestral populations.