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Xiang W, Dai W, Cai G. A nomogram for the prediction of KRAS mutation in colorectal cancer. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy318.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Li H, Xia P, Wang C, Wang Y, Zhao XY, Ma K, Dai W, Cao Y, Zhou HG, Liu WB. [Establishment of DNA Genetic Marker Identification System for Plant Evidence]. FA YI XUE ZA ZHI 2018; 34:138-141. [PMID: 29923377 DOI: 10.3969/j.issn.1004-5619.2018.02.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Indexed: 11/18/2022]
Abstract
OBJECTIVES To establish a species identification system based on DNA genetic markers for plant evidence. METHODS Two hundred common plants in Shanghai were collected and identified by morphological characteristics. The primers of gene segments rbcL, matK, and ITS were designed and amplified. The PCR amplicon was detected by agarose gel electrophoresis. After the sequencing, the universality and the identification capacity of the three markers were evaluated. RESULTS The success rate of amplification was in order of rbcL (99.5%) > matK (92.5%) > ITS (86.0%). The identification capacity of the combination of rbcL and matK was better than that of rbcL or matK, by which most plant species could be identified to the genus or higher. ITS was not suitable to be a unique marker because of its unstable result, but it still could be a powerful supplement. The identification capacity of the combination of rbcL, matK and ITS was higher than that of rbcL and matK, by which most plant species could be identified to the genus or lower. CONCLUSIONS The identification system with the combination of rbcL, matK and ITS as markers has excellent universality for plant evidence, which can distinguish most plant species to the genus or lower.
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Xu Z, Dai W, Wu YT, Arshad B, Li X, Wu H, Chen HR, Wu KN, Kong LQ. Prophylactic effect of lamivudine on chemotherapy-induced hepatitis B virus reactivation in patients with solid tumour: A meta-analysis. Eur J Cancer Care (Engl) 2017; 27:e12799. [PMID: 29265535 DOI: 10.1111/ecc.12799] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/21/2017] [Indexed: 01/03/2023]
Abstract
Hepatitis B virus (HBV) reactivation is a remarkable risk during the chemotherapy for solid tumour patients. Nucleos(t)ide analogues (NAs) are recommended as prophylaxis for the reactivation of HBV infection in some cancer patients prior to systemic chemotherapy. Therefore, we performed a meta-analysis aiming to determine the efficacy of prophylactic lamivudine on prevention of HBV reactivation and its related negative outcomes among solid tumour patients with chronic HBV infection receiving systemic chemotherapy. The primary outcome was HBV reactivation, and the secondary outcomes were HBV-related hepatitis, chemotherapy disruption, mortality and tyrosine-methio-nine-aspartate-aspartate (YMDD) mutations. Twelve original researches involving 1,101 patients were analysed in this study. The relative risk of HBV reactivation in patients with lamivudine prophylaxis was significantly lower than that without prophylaxis (RR = 0.17, 95% CL: 0.10-0.29, p < .00001). Lamivudine prophylaxis reduced the relative risk of hepatitis (p < .00001), chemotherapy disruptions (p = .01) and mortality (p = .08) due to HBV reactivation. Lamivudine prophylaxis is effective in reducing HBV reactivation and its related negative outcomes, such as hepatitis and chemotherapy disruption and mortality among chemotherapeutic solid tumour patients with chronic HBV infection. Future studies should lay more emphasis on the early HBV screening, mode of treatment and duration of NAs prophylaxis among solid tumour patients receiving chemotherapy.
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Li Y, Feng Y, Dai W, Mo S, Li Q, Cai S. Incidence and survival outcomes in mucinous and signet-ring cell colorectal cancers differ from classical adenocarcinoma: A SEER analysis. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx659.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Dai W, Yang X, Zhuang X, Xie T, Xiao P, Hu B, Wang X, Li Q. P3.16-009 Reoperation for Hemostasis within 24 Hours Can Get a Better Short-Term Outcome When Indicated after Lung Cancer Surgery. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Dai W, Li Y, Li Q, Cai G. A robust gene signature for the detection of early relapse in stage I-III colon cancer. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx659.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Mo S, Huang B, Dai W, Li Q, Cai G. Survival contradiction between stage IIA and stage IIIA rectal cancer. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx659.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Mo S, Dai W, Li Y, Feng Y, Zhang L, Li Q, Cai G. Prognostic value of an autophagy-related signature for early relapse in stage I-III colon cancer. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx659.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Dai W, Li Y, Mo S, Cai G. A robust gene signature for the detection of early relapse in stage I-III colon cancer. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx393.098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Zhang S, Dai W, Lu Z, Lei Z, Yang B, He B, Zhou H, Cao J. Preparation and evaluation of cefquinome-loaded gelatin microspheres and the pharmacokinetics in pigs. J Vet Pharmacol Ther 2017; 41:117-124. [PMID: 28656695 DOI: 10.1111/jvp.12429] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 05/25/2017] [Indexed: 11/29/2022]
Abstract
Cefquinome (CEF) is widely used for veterinary clinical applications because of its broad spectrum and high efficiency. However, frequent administrations are required due to its short elimination half-life. In this study, cefquinome sulfate gelatin microspheres (CEF-GMS) were prepared as a sustained-release formulation using emulsion chemical cross-linking technique. Physical properties, stability, sustained-release property in vitro, and pharmacokinetics in pigs were assessed. The morphology of CEF-GMS showed a good sphericity with porous structure on the surface, and the mean diameter was 8.80 ± 0.78 μm, with 90.60 ± 3.98% of the total in the range of 5-20 μm. There were no significant changes of all estimated indexes in the stability tests. In vitro drug release study showed that the release of CEF from CEF-GMS was much slower than that from crude CEF in a release medium. Pharmacokinetic characteristics were evaluated following intramuscular administration of CEF-GMS or Cefquinome sulfate injection (CEF-Inj) in pigs at a dosage of 4 mg CEF/kg body weight. The plasma drug concentration-time data of CEF-GMS and CEF-Inj were both best fitted by two-compartment models with first-order absorption, and the elimination half-life of CEF-GMS was almost 10 times that of CEF-Inj. Overall, CEF-GMS might be used as a sustained-release formulation of CEF for veterinary clinical applications.
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Ma NZ, Chen L, Hu LL, Dai W, Bu ZQ, Sun YP. The influence of male age on treatment outcomes and neonatal birthweight following assisted reproduction technology involving intracytoplasmic sperm injection (ICSI) cycles. Andrologia 2017; 50. [PMID: 28466604 DOI: 10.1111/and.12826] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/11/2017] [Indexed: 12/18/2022] Open
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Song Y, Li Y, Zheng S, Dai W, Shen X, Zhang Y, Zhao W, Chang G, Xu Q, Chen G. Effects of forage feeding versus grain feeding on the growth performance and meat quality of Yangzhou geese. Br Poult Sci 2017; 58:397-401. [DOI: 10.1080/00071668.2017.1307942] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Ma W, Dai W, Wang Y. Abstract PR544. Anesth Analg 2016. [DOI: 10.1213/01.ane.0000492926.10807.e5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Li SL, Duo LN, Wang HJ, Dai W, Zhou EYH, Xu YN, Zhao T, Xiao YY, Xia L, Yang ZH, Zheng LT, Hu YY, Lin ZM, Wang HN, Gao TW, Ma CL, Yang Y, Li CY. Identification of LCK mutation in a family with atypical epidermodysplasia verruciformis with T-cell defects and virus-induced squamous cell carcinoma. Br J Dermatol 2016; 175:1204-1209. [PMID: 27087313 DOI: 10.1111/bjd.14679] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/12/2016] [Indexed: 11/28/2022]
Abstract
BACKGROUND Inherited epidermodysplasia verruciformis (EV) is a rare skin disorder characterized by susceptibility to specific types of human papilloma virus (HPV) and is strongly associated with skin carcinomas. Inactivating mutations in EVER1/EVER2 account for most cases of EV. However, more phenotypes related to but distinct from EV have been reported with an immunodeficiency state but without EVER1/EVER2 mutation, and the genetic basis for these atypical EV cases is poorly understood. OBJECTIVES To identify the causative gene responsible for three siblings affected by atypical EV but without EVER1/EVER2 mutation. METHODS Whole-exome sequencing followed by Sanger sequencing was performed to identify the gene responsible for the patients with atypical EV enrolled in our study. RESULTS A homozygous splicing mutation was detected in LCK (c.188-2A>G). This mutation resulted in an exon 3 deletion T lymphocyte-specific protein tyrosine kinase isoform, which further led to frameshift mutation and subsequent mRNA decay. CONCLUSIONS We demonstrate a novel mutation in LCK in a family affected by atypical EV with T-cell defects, HPV infection and virus-induced malignancy, providing new clues in the understanding of host defences against HPV and better genetic counselling of patients with the EV phenotype.
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Yamada HY, Kumar G, Zhang Y, Rubin E, Lightfoot S, Dai W, Rao CV. Systemic chromosome instability in Shugoshin-1 mice resulted in compromised glutathione pathway, activation of Wnt signaling and defects in immune system in the lung. Oncogenesis 2016; 5:e256. [PMID: 27526110 PMCID: PMC5007830 DOI: 10.1038/oncsis.2016.56] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 06/15/2016] [Accepted: 06/29/2016] [Indexed: 12/13/2022] Open
Abstract
Mitotic error-mediated chromosome instability (CIN) can lead to aneuploidy, chromothripsis, DNA damage and/or whole chromosome gain/loss. CIN may prompt rapid accumulation of mutations and genomic alterations. Thus, CIN can promote carcinogenesis. This CIN process results from a mutation in certain genes or environmental challenge such as smoking, and is highly prevalent in various cancers, including lung cancer. A better understanding of the effects of CIN on carcinogenesis will lead to novel methods for cancer prevention and treatment. Previously Shugoshin-1 (Sgo1(-/+)) mice, a transgenic mouse model of CIN, showed mild proneness to spontaneous lung and liver cancers. In this study, adoptive (T/B-cell based) immunity-deficient RAG1(-/-) Sgo1(-/+) double mutant mice developed lung adenocarcinomas more aggressively than did Sgo1(-/+) or RAG1(-/-) mice, suggesting immune system involvement in CIN-mediated lung carcinogenesis. To identify molecular causes of the lung adenocarcinoma, we used systems biology approach, comparative RNAseq, to RAG1(-/-) and RAG1(-/-) Sgo1(-/+). The comparative RNAseq data and follow-up analyses in the lungs of naive Sgo1(-/+) mice demonstrate that, (i) glutathione is depleted, making the tissue vulnerable to oxidative stress, (ii) spontaneous DNA damage is increased, (iii) oncogenic Wnt signaling is activated, (iv) both major branches of the immune system are weakened through misregulations in signal mediators such as CD80 and calreticulin and (v) the actin cytoskeleton is misregulated. Overall, the results show multi-faceted roles of CIN in lung carcinoma development in Sgo1(-/+) mice. Our model presents various effects of CIN and will help to identify potential targets to prevent CIN-driven carcinogenesis in the lung.
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Li S, Zhu G, Yang Y, Jian Z, Guo S, Dai W, Shi Q, Ge R, Ma J, Liu L, Li K, Wang G, Gao T, Li C. 065 Oxidative stress activate the unfolded protein response in keratinocytes resulting in CXCL16 production and CD8 + T cells skin trafficking in vitiligo. J Invest Dermatol 2016. [DOI: 10.1016/j.jid.2016.02.090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Xu D, Yin Y, Hou L, Dai W. Surgical management of secondary hyperparathyroidism: how to effectively reduce recurrence at the time of primary surgery. J Endocrinol Invest 2016; 39:509-14. [PMID: 26620950 DOI: 10.1007/s40618-015-0410-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 11/05/2015] [Indexed: 12/17/2022]
Abstract
BACKGROUND Successful parathyroidectomy (PTX) often results in a dramatic drop in the parathyroid hormone (PTH) levels, relieves the patient from clinical symptoms, and reduces mortality. Although PTX is generally a successful treatment for progressive secondary hyperparathyroidism (SHPT) patients subjected to surgery, a significant proportion develops recurrent SHPT following PTX. KEY MESSAGE SHPT requiring PTX occurs more commonly in progressive chronic kidney disease and in long-term lithium therapy. Operative approaches include subtotal PTX, total PTX with or without autotransplantation, and possible thymectomy. Each approach has its proponents, advantages, and disadvantages. Although PTX offers the highest percentage cure for SHPT, compared to all other medical and surgical treatment, recurrent hyperparathyroidism can be observed in some patients dependent on follow-up time. A literature review and analysis of recent data regarding how to reduce recurrence of SHPT at the time of primary surgery was performed. The current literature and our own experience in the field have confirmed that pre-operative imaging, thymectomy, stereo magnifier, and surgical procedure may effectively reduce recurrence of SHPT at the time of primary surgery.
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Ge R, Liu L, Dai W, Zhang W, Yang Y, Wang H, Shi Q, Guo S, Yi X, Wang G, Gao T, Luan Q, Li C. 652 XPA promotes autophagy to facilitate cisplatin resistance in melanoma cells through the activation of PARP1. J Invest Dermatol 2016. [DOI: 10.1016/j.jid.2016.02.693] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yao W, Dai W, Jiang L, Lay EYA, Zhong Z, Ritchie RO, Li X, Ke H, Lane NE. Sclerostin-antibody treatment of glucocorticoid-induced osteoporosis maintained bone mass and strength. Osteoporos Int 2016; 27:283-294. [PMID: 26384674 PMCID: PMC4958115 DOI: 10.1007/s00198-015-3308-6] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 08/25/2015] [Indexed: 12/18/2022]
Abstract
UNLABELLED This study was to determine if antibody against sclerostin (Scl-Ab) could prevent glucocorticoid (GC)-induced osteoporosis in mice. We found that Scl-Ab prevented GC-induced reduction in bone mass and bone strength and that the anabolic effects of Scl-Ab might be partially achieved through the preservation of osteoblast activity through autophagy. INTRODUCTION Glucocorticoids (GCs) inhibit bone formation by altering osteoblast and osteocyte cell activity and lifespan. A monoclonal antibody against sclerostin, Scl-Ab, increased bone mass in both preclinical animal and clinical studies in subjects with low bone mass. The objectives of this study were to determine if treatment with the Scl-Ab could prevent loss of bone mass and strength in a mouse model of GC excess and to elucidate if Scl-Ab modulated bone cell activity through autophagy. METHODS We generated reporter mice that globally expressed dsRed fused to LC3, a protein marker for autophagosomes, and evaluated the dose-dependent effects of GCs (0, 0.8, 2.8, and 4 mg/kg/day) and Scl-Ab on autophagic osteoblasts, bone mass, and bone strength. RESULTS GC treatment at 2.8 and 4 mg/kg/day of methylprednisolone significantly lowered trabecular bone volume (Tb-BV/TV) at the lumbar vertebrae and distal femurs, cortical bone mass at the mid-shaft femur (FS), and cortical bone strength compared to placebo (PL). In mice treated with GC and Scl-Ab, Tb-BV/TV increased by 60-125 %, apparent bone strength of the lumbar vertebrae by 30-70 %, FS-BV by 10-18 %, and FS-apparent strength by 13-15 %, as compared to GC vehicle-treated mice. GC treatment at 4 mg/kg/day reduced the number of autophagic osteoblasts by 70 % on the vertebral trabecular bone surface compared to the placebo group (PL, GC 0 mg), and GC + Scl-Ab treatment. CONCLUSIONS Treatment with Scl-Ab prevented GC-induced reduction in both trabecular and cortical bone mass and strength and appeared to maintain osteoblast activity through autophagy.
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Dai W, Liu M, Zhuang X, Li Q, Wang D. Mediastinal small cell carcinoma: a unique clinical entity? Clin Transl Oncol 2015; 18:515-20. [PMID: 26329297 DOI: 10.1007/s12094-015-1398-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Accepted: 08/19/2015] [Indexed: 01/31/2023]
Abstract
PURPOSE Mediastinal small cell carcinoma (MSCC) is a rare tumor with limited published literature. In view of diagnostic confusion pertaining to this tumor, we investigated its origin, clinical features, management and survival. METHODS Clinical data of MSCC patients were retrospectively reviewed. Eligible patients showed pathologically proven small cell carcinoma (SCC) with the primary lesions confined to the mediastinum. Survival information was collected through follow-up studies. RESULTS Among 25 MSCC patients identified, 22 were classified to have limited disease (LD), while 3 were with extensive disease (ED). The 5 patients (20%) underwent surgery and 20 patients (80%) underwent non-surgical treatment. The 4 patients with LD MSCC received chemotherapy alone, while 13 of them received chemoradiotherapy. Overall median survival time (MST) of all patients was 22 months, and the 1-, 3- and 5-year overall survival rates were 67.4, 16.8, and 8.4%, respectively. The MST of LD and ED patients separately was 23 and 8 months, respectively, with significant difference (P = 0.005). But, the MST of patients who received surgical and non-surgical treatment was 25 and 21 months, respectively, with no significant difference (P = 0.757). The MST of LD patients receiving chemotherapy and chemoradiotherapy was 12 and 29 months, respectively, but somehow did not show significant difference (P = 0.482). CONCLUSIONS Our data suggested that MSCC may be a separate clinical entity like extrapulmonary small cell carcinomas (EPSCCs). Despite, multimodal treatment is currently the main treatment option, but for patients with LD MSCC, chemoradiotherapy is recommended to be preferred treatment modality.
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Ye H, Chen P, Dai W, Zheng Q, Wu F. [Association of long-term oral low-dose aspirin and survival in colorectal cancer: a meta-analysis]. ZHONGHUA WEI CHANG WAI KE ZA ZHI = CHINESE JOURNAL OF GASTROINTESTINAL SURGERY 2015; 18:589-592. [PMID: 26108775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
OBJECTIVE To examine the association between long-term oral low-dose aspirin and overall survival in colorectal cancer patients after diagnosis. METHODS The literature databases, such as PubMed, Embase, Cochrane Library, Web of Science, CBM, CNKI, and Wanfang database, were extensively searched to retrieve the comparative studies about the association between low-dose aspirin use after colorectal cancer diagnosis and overall survival published before June 2014. The state 12.0 version software was used for meta-analysis. The quality of these studies was assessed using the Newcastle-Ottawa scale. RESULTS There were eight studies meeting the inclusion criteria for meta-analysis. The total sample size of these studies included 28 103 cases and the score of all the studies was more than 6 points. Meta-analysis of the data using I(2) test showed significant heterogeneity (I(2)=78.2%, P<0.01), therefore, a random effect model was performed. Aspirin use after diagnosis was associated with longer overall survival (HR=0.732, 95% CI:0.613-0.875, P<0.01). There were seven studies with the same design or tumor stage in I-IIII period respectively for sensitivity analysis. The results of studies showed that the sensitivity was low and accurate (HR=0.687, 95% CI: 0.557-0.849, P<0.01; HR=0.682, 95% CI: 0.539-0.864, P<0.01). CONCLUSION Meta-analysis shows that long-term oral low-dose aspirin after diagnosis of colorectal cancer is identified as a significant prognostic factor.
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Zhang W, Dai W, Tsai SM, Zehnder SM, Sarntinoranont M, Angelini TE. Surface indentation and fluid intake generated by the polymer matrix of Bacillus subtilis biofilms. SOFT MATTER 2015; 11:3612-3617. [PMID: 25797701 DOI: 10.1039/c5sm00148j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Bacterial biofilms are highly structured, surface associated bacteria colonies held together by a cell-generated polymer network known as EPS (extracellular polymeric substance). This polymer network assists in adhesion to surfaces and generates spreading forces as colonies grow over time. In the laboratory and in nature, biofilms often grow at the interface between air and an elastic, semi-permeable nutrient source. As this type of biofilm increases in volume, an accommodating compression of its substrate may arise, potentially driven by the osmotic pressure exerted by the EPS against the substrate surface. Here we study Bacillus subtilis biofilm force generation by measuring the magnitude and rate of deformation imposed by colonies against the agar-nutrient slabs on which they grow. We find that the elastic stress stored in deformed agar is orders of magnitude larger than the drag stress associated with pulling fluid through the agar matrix. The stress exerted by the biofilm is nearly the same as the osmotic pressure generated by the EPS, and mutant colonies incapable of producing EPS exert much lower levels of stress. The fluid flow rate into B. subtilis biofilms suggest that EPS generated pressure provides some metabolic benefit as colonies expand in volume. These results reveal that long-term biofouling and colony expansion may be tied to the hydraulic permeability and elasticity of the surfaces that biofilms colonize.
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Dai W, Zhou FB, Wei C, Wang XW, Guo S, Yi XL, Li K, Gao TW, Liu L, Li CY. A functional single-nucleotide polymorphism in the ERCC1 gene alters the efficacy of narrowband ultraviolet B therapy in patients with active vitiligo in a Chinese population. Br J Dermatol 2015; 173:457-63. [PMID: 25965418 DOI: 10.1111/bjd.13892] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/27/2015] [Indexed: 11/29/2022]
Abstract
BACKGROUND T lymphocytes have been shown to cause the destruction of melanocytes in vitiligo pathogenesis. Narrowband ultraviolet B (NB-UVB), as an effective therapeutic strategy in vitiligo, can lead to the formation of DNA photoproducts such as cyclobutane pyrimidine dimers (CPDs) in perilesional lymphocytes and thus induce skin immunosuppression. The repair of DNA photoproducts is performed mainly through the nucleotide excision repair (NER) pathway. We hypothesized that single-nucleotide polymorphisms (SNPs) in NER genes might influence the repair capacity of CPDs and thus contribute to variations in phototherapy efficiency. OBJECTIVES To detect genetic polymorphisms in NER genes and their relationship with the efficacy of NB-UVB therapy in patients with active vitiligo. METHODS We investigated the association of NER SNPs (XPA A23G, XPC Ci11A, XPC C2919A and ERCC1 C118T) with phototherapy efficacy in 86 patients with vitiligo who received NB-UVB treatment. Furthermore, we examined the impact of ERCC1 C118T on the apoptosis of T lymphocytes and CPD accumulation after NB-UVB irradiation. RESULTS We found that patients with vitiligo with the ERCC1 codon 118 CC genotype showed better efficacy after NB-UVB irradiation than those with the ERCC1 118 TT and CT genotypes, whereas no such association was documented among the genotypes of XPA A23G, XPC Ci11A or XPC C2919A. Additionally, the apoptosis rates and CPD levels of lymphocytes after NB-UVB irradiation in patients with the ERCC1 118 CC genotype were significantly higher than those in patients with the ERCC1 118 TT and CT genotypes. CONCLUSIONS The ERCC1 118 CC genotype confers better efficacy of NB-UVB therapy in patients with active vitiligo.
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Ai JG, Zhao F, Gao ZM, Dai W, Zhang L, Chen HB, Zhou JG. Treatment of seawater immersion-complicated open-knee joint fracture. GENETICS AND MOLECULAR RESEARCH 2014; 13:5523-33. [PMID: 25117308 DOI: 10.4238/2014.july.25.6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The current study aimed to select suitable remedies for seawater immersion-complicated open-knee joint fracture by exploring the effects of different treatment methods. Forty adult rabbits weighing 2.20 ± 0.25 kg were divided equally into internal fracture fixation group (A), seawater-immersed group with primary internal fixation (B), seawater-immersed group with secondary internal fixation (C), and seawater-immersed group with external fixation (D), using the random-digit table method. Open-femoral internal condylar fracture models were established. Group A was left untreated for 2 h, whereas the other three groups were subjected to seawater immersion for 2 h. Afterwards, groups A and B underwent debridement and steel plate and screw internal fixation. Group C underwent debridement and external fixation, which was followed by secondary steel plate and screw internal fixation after the wound healed. Group D underwent transarticular arthrodesis. Wound infection, joint functional rehabilitation, and radiological and histopathological changes in fracture healing in each group were assessed. The results showed that delayed internal fixation effectively reduces the infection rate of seawater immersion-complicated open fracture and benefits joint function rehabilitation.
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Kwan H, Dai W, Chan C, Tong T, Lee K, Pan S, Wu Y, Tse K, Yu Z, Fong W. Lipidomic-based study of the regulatory role of schisandrin B on fatty acid production in a hepatic steatosis mouse model. PHARMANUTRITION 2014. [DOI: 10.1016/j.phanu.2013.11.089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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