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Zhang F, Yang Y, Guo C, Wang Y. CASP8 -652 6N del polymorphism and cancer risk: a meta-analysis of 30 case-control studies in 50 112 subjects. Mutagenesis 2012; 27:559-66. [DOI: 10.1093/mutage/ges019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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Lin T, Wang C, Cai XZ, Zhao X, Shi MM, Ying ZM, Yuan FZ, Guo C, Yan SG. Comparison of clinical efficacy and safety between denosumab and alendronate in postmenopausal women with osteoporosis: a meta-analysis. Int J Clin Pract 2012; 66:399-408. [PMID: 22313934 DOI: 10.1111/j.1742-1241.2011.02806.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The aim of this study was to perform a head-to-head comparison of efficacy and safety profile between 60 mg denosumab (Den) subcutaneously (SC) per 6 months (Q6M) and 70 mg alendronate (Aln) orally per week (QW) for postmenopausal women with low bone mineral density. We searched electronic databases comparing efficacy and safety of Den SC Q6M and Aln QW in postmenopausal women. The primary outcomes of efficacy evaluation in included trials were incidence of clinical fracture in both groups and bone mineral density (BMD) at different skeletal sites. And adverse events (AEs), including incidence of neoplasms and infections, were considered as secondary outcomes. Following the instructions of 'Cochrane Handbook for systematic Reviews of Interventions 5.0.2', we identified eligible studies, evaluated the methodological quality and abstracted relevant data. Four heterogeneous randomised controlled trials (RCTs) involving 1942 women were identified. The results of review showed low evidence quality that supported the hypothesis the denosumab vs. alendronate could reduce risk of fracture [OR (95% CI) 1.42 (0.84 to 2.40), 11 more women per 1000 (from 4 fewer to 36 more), p = 0.19] but the moderate to high quality evidence suggesting treatment with 60 mg Den SC Q6M was more effective for postmenopausal women in increasing BMD [at distal radius (DR), total hip (TH), lumbar spine (LS), and femoral neck (FN)]. Hazards of neoplasms [OR (95% CI) 1.10 (0.65 to 1.86), 3 more per 1000 (from 10 fewer to 24 more), p = 0.62] or infections [OR (95% CI) 0.95 (0.79 to 1.15), 12 fewer per 1000 (from 53 fewer to 33 more,), p = 0.62] were appeared to be similar.Our review suggested within 1 year 60 mg Den SC Q6M treatment was more effective in increasing bone mass but could not reduce the fracture risk to a greater extent than 70 mg Aln QW therapy. Also the Den SC Q6M therapy did not increase the risks of neoplasms and infections compared with Aln QW.
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Luo W, Öhman M, Wright A, Kamrudin S, Wang H, Guo C, Eitzman D. Steatohepatitis and vascular thrombosis in apolipoprotein e deficient mice. Thromb Res 2012; 129:e166-7. [PMID: 22326191 DOI: 10.1016/j.thromres.2012.01.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Revised: 01/04/2012] [Accepted: 01/16/2012] [Indexed: 11/16/2022]
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154
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Han W, Wang Z, Lu X, Guo C. Protease activated receptor 4 status of mast cells in post infectious irritable bowel syndrome. Neurogastroenterol Motil 2012; 24:113-9, e82. [PMID: 22151913 DOI: 10.1111/j.1365-2982.2011.01841.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Growing evidence suggests that protease activated receptors (PARs) are mediators of persistent neuropathic pain, but their possible function as mediators in patients with post infectious irritable bowel syndrome (PI-IBS) remains to be further explored. This article aims to investigate the expression of PAR(2) and PAR(4) in the colonic mucosa of patients with PI-IBS, focusing on correlation with mast cell activation status. METHODS A total of 17 normal controls and 23 patients with PI-IBS volunteered the study. The expression and localization of PAR(2) and PAR(4) were investigated by RT-PCR and immunohistochemistry, and the expression of PAR(2) and PAR(4) in the mast cells was examined using double-immunofluorescence staining. KEY RESULTS The immunohistochemical study revealed that epithelial and submucosal cells showed immunoreactivity for both PAR(2) and PAR(4). Protease activated receptor 4 mRNA expression and immunoreactivity were down-regulated in PI-IBS compared with the control group. Specifically, a reduced immunoreactivity for PAR(4) was observed in mast cells of PI-IBS compared with normal controls, whereas there are no significant differences shown in PAR(2) between the PI-IBS and the control group. It is also found that the PAR(4) immunoreactivity decreases, while the activity of mast cells increases in PI-IBS rather than normal controls. CONCLUSIONS & INFERENCES This study outlines the down-regulation of PAR(4) in the mast cells of PI-IBS. It could be of considerable interests in understanding the mechanisms involved in the persistent colonic hypersensitivity and their potential role as therapeutic targets for PI-IBS.
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Kong XJ, Guo C, Liu GX, Wang Y, Nishihara S. Synthesis, crystal structure, and magnetic properties of a 3d-3d mixed heterometallic coordination polymer. RUSS J COORD CHEM+ 2012. [DOI: 10.1134/s1070328412010046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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156
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Bulgar AD, Weeks LD, Miao Y, Yang S, Xu Y, Guo C, Markowitz S, Oleinick N, Gerson SL, Liu L. Removal of uracil by uracil DNA glycosylase limits pemetrexed cytotoxicity: overriding the limit with methoxyamine to inhibit base excision repair. Cell Death Dis 2012; 3:e252. [PMID: 22237209 PMCID: PMC3270269 DOI: 10.1038/cddis.2011.135] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2011] [Revised: 11/09/2011] [Accepted: 11/09/2011] [Indexed: 01/03/2023]
Abstract
Uracil DNA glycosylase (UDG) specifically removes uracil bases from DNA, and its repair activity determines the sensitivity of the cell to anticancer agents that are capable of introducing uracil into DNA. In the present study, the participation of UDG in the response to pemetrexed-induced incorporation of uracil into DNA was studied using isogenic human tumor cell lines with or without UDG (UDG(+/+)/UDG(-/-)). UDG(-/-) cells were very sensitive to pemetrexed. Cell killing by pemetrexed was associated with genomic uracil accumulation, stalled DNA replication, and catastrophic DNA strand breaks. By contrast, UDG(+/+) cells were >10 times more resistant to pemetrexed due to the rapid removal of uracil from DNA by UDG and subsequent repair of the resultant AP sites (abasic sites) via the base excision repair (BER). The resistance to pemetrexed in UDG(+/+) cells could be reversed by the addition of methoxyamine (MX), which binds to AP sites and interrupts BER pathway. Furthermore, MX-bound AP sites induced cell death was related to their cytotoxic effect of dual inactivation of UDG and topoisomerase IIα, two genes that are highly expressed in lung cancer cells in comparison with normal cells. Thus, targeting BER-based therapy exhibits more selective cytotoxicity on cancer cells through a synthetic lethal mechanism.
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Zheng Y, Wu Q, Fang Y, He Y, Zhou H, Liu Y, Chen J, Xian W, Fu X, Shen C, Guo C, Chen L, Pei Z. 3.050 THE ASSOCIATION BETWEEN LRRK2 S1647T POLYMORPHISM AND COGNITIVE FUNCTION IN PARKINSON'S DISEASE. Parkinsonism Relat Disord 2012. [DOI: 10.1016/s1353-8020(11)70786-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Meng J, Guo C, Luo H, Chen S, Ma X. A case of destructive calcium pyrophosphate dihydrate crystal deposition disease of the temporomandibular joint: a diagnostic challenge. Int J Oral Maxillofac Surg 2011; 40:1431-7. [DOI: 10.1016/j.ijom.2011.05.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2010] [Revised: 04/25/2011] [Accepted: 05/10/2011] [Indexed: 01/16/2023]
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Chu CL, Ji HL, Guo C, Sheng XB, Dong YS, Lin PH, Hu T, Chu PK. Surface nanomechanical behavior of ZrN and ZrCN films deposited on NiTi shape memory alloy by magnetron sputtering. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2011; 11:11176-11180. [PMID: 22409080 DOI: 10.1166/jnn.2011.4051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Surface nanomechanical behavior under nanoindentation of ZrN and ZrCN film on NiTi substrate was studied. The surface hardness and modulus of the films increase initially with larger nanoindentation depths and then reach their maximum values. Afterwards, they diminish gradually and finally reaching plateau values which are the composite modulus and composite hardness derived from the ZrN/ZrCN film and NiTi substrate. They are higher than those of electropolished NiTi SMA due to the properties of ZrN and ZrCN. In comparison, the surface nanomechanical properties of electropolished NiTi exhibit a different change with depths.
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Guo C, Xia Y, Yang Q, Qiu R, Zhao H, Liu Q. Association of the ANTXR2 gene polymorphism and ankylosing spondylitis in Chinese Han. Scand J Rheumatol 2011; 41:29-32. [PMID: 22118297 DOI: 10.3109/03009742.2011.600700] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE Ankylosing spondylitis (AS) is an inflammatory disease of unknown origin. Both genetic and environmental factors are involved. A recent genome-wide association study (GWAS) found anthrax toxin receptor 2 (ANTXR2) to be associated with AS in Caucasians. We aimed to investigate whether the ANTXR2 polymorphism is also associated with AS in a Chinese Shandong Han population. METHODS From 2008 to 2009, we recruited 309 patients with AS and 384 age- and sex-matched controls of Han nationality. We selected six single nucleotide polymorphisms (SNPs) of ANTXR2 (rs4333130, rs6534708, rs6818557, rs12646132, rs12509658, and rs13140055) and genotyped them by polymerase chain reaction restriction fragment-length polymorphism (PCR-RFLP) and Taqman methods. We analysed linkage disequilibrium and constructed haplotypes. RESULTS Cases and controls did not differ in the frequency of ANTXR2 alleles, genotypes, or haplotypes. Thus, the six SNPs of ANTXR2 are not associated with AS in our Chinese Shandong Han population. CONCLUSIONS ANTXR2 might not be a susceptibility gene of AS in Chinese Han.
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Lin H, Quan C, Guo C, Zhou C, Wang Y, Bao B. Translation and validation of the Chinese version of the psychosocial impact of dental aesthetics questionnaire. Eur J Orthod 2011; 35:354-60. [DOI: 10.1093/ejo/cjr136] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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162
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Zhang J, Liu G, Guo C, He Y, Li Z, Ning G, Shi X, Bao M. The FLOWERING LOCUS T orthologous gene of Platanus acerifolia is expressed as alternatively spliced forms with distinct spatial and temporal patterns. PLANT BIOLOGY (STUTTGART, GERMANY) 2011; 13:809-20. [PMID: 21815986 DOI: 10.1111/j.1438-8677.2010.00432.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The FLOWERING LOCUS T (FT) protein is a likely component of the 'florigen' signal that plays a crucial role in regulating the transition from vegetative to reproductive growth. Here, we report the isolation of full-length cDNAs and the corresponding genomic clones encoding orthologous FT proteins (PaFT) of London plane (Platanus acerifolia Willd). Two genes with high sequence identity were isolated (PaFT1-2), but 34 different transcript products were identified, comprising 21 splice forms produced by alternative splicing of the PaFT pre-mRNAs. Expression of the alternative splicing forms of PaFT varied according to tissue type and developmental stage. PaFT transcripts were detected throughout adult trees, whereas in juvenile trees they were only detected in dormant sub-petiolar buds. In adult trees, levels of the various alternative splicing PaFT forms were related to flower development stage and tree dormancy. Ectopic expression of the archetypal splice form of PaFT-A in tobacco and Arabidopsis developed multiple altered phenotypes, notably early flowering and attenuation of apical dominance. The evidence in this study indicates that complex alternative processing of PaFT transcripts in P. acerifolia may be associated with multiple regulatory roles, including initiation of flowering, flower development, apical dominance, tree dormancy and dormancy release.
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Öhman MK, Luo W, Wang H, Guo C, Abdallah W, Russo HM, Eitzman DT. Perivascular visceral adipose tissue induces atherosclerosis in apolipoprotein E deficient mice. Atherosclerosis 2011; 219:33-9. [PMID: 21835408 DOI: 10.1016/j.atherosclerosis.2011.07.012] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Revised: 07/05/2011] [Accepted: 07/05/2011] [Indexed: 11/20/2022]
Abstract
OBJECTIVE Epicardial adipose tissue is associated with coronary artery disease, however the causal relationship between perivascular adipose tissue and local atherogenesis is unclear. METHODS AND RESULTS Apolipoprotein E deficient (ApoE(-/-)) mice underwent transplantation of visceral or subcutaneous adipose tissue immediately adjacent to the right common carotid artery. Carotid arteries with fat transplants were analyzed for atherosclerosis by surface oil-red-O staining and cross-sectional analysis. Vascular function of the carotid arteries was assessed using pressure myography. Visceral fat transplants were also performed to ApoE(-/-) mice with neutralization of P-selectin glycoprotein ligand-1 (Psgl-1). Atherosclerosis surface area and lesion thickness were greater in mice receiving the perivascular visceral fat compared to the subcutaneous fat. Mice with visceral fat transplants also displayed more complicated atherosclerotic lesions with evidence of atherothrombosis. Serum Mcp-1 was higher in mice receiving visceral fat transplants compared to subcutaneous transplants. Visceral fat transplantation also caused impaired endothelial-dependent relaxation of the carotid artery. Psgl-1 deficiency or neutralization of Psgl-1 with an anti-Psgl-1 antibody was protective against perivascular visceral adipose tissue-induced atherosclerosis and was associated with reduced Mcp-1 levels. CONCLUSIONS Perivascular visceral fat leads to endothelial dysfunction and accelerated atherosclerosis. This proatherogenic effect of perivascular adipose tissue is blocked by neutralization of Psgl-1.
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Souto M, Coelho A, Guo C, Mendonça L, Argolo S, Papi J, Farias M. Vitamin D insufficiency in Brazilian patients with SLE: prevalence, associated factors, and relationship with activity. Lupus 2011; 20:1019-26. [PMID: 21646315 DOI: 10.1177/0961203311401457] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The influence of vitamin D on the severity of systemic lupus erythematosus (SLE) has been studied. Our objectives were to determine the prevalence of vitamin D insufficiency in Brazilian lupus patients and its relationship with demographic, clinical, and laboratory variables and to study the relationship between vitamin D insufficiency and disease activity. This is a cross-sectional study of 159 SLE patients. Levels of serum 25-hydroxyvitamin D (25(OH)D) <30 ng/ml were defined as vitamin D insufficiency and <20 ng/ml as deficiency. Data collected included sex, age, ethnicity, postmenopausal status, disease duration, cumulative amount of oral glucocorticoids (GC) in the last six months, duration of GC usage, calcium and vitamin D supplements, photosensitivity, sunscreen usage, sun exposure, diabetes mellitus, creatinine clearance, lifestyle habits, and smoking. Disease activity was measured by the SLE Disease Activity Index 2000 (SLEDAI-2K). Bivariate statistical analysis was performed using the Mann-Whitney test, Spearman's correlation coefficient, Chi-square test, and Fisher's exact test. Multivariate analysis was performed with multiple linear regression. The prevalence of vitamin D insufficiency and deficiency were 37.7% and 8.2%, respectively. Levels of 25(OH) D were not associated with lupus activity score, disease duration, sun exposure, vitamin D supplementation, or use of corticosteroids.
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Hedin T, Guo C, Nattinger A. Persistence with adjuvant hormone therapy in older breast cancer survivors. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.6032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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166
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Sun L, Guo C, Liu D, Zhao Y, Zhang Y, Song Z, Han H, Chen D, Zhao Y. Protective effects of bone morphogenetic protein 7 against amyloid-beta induced neurotoxicity in PC12 cells. Neuroscience 2011; 184:151-63. [PMID: 21496477 DOI: 10.1016/j.neuroscience.2011.03.059] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Revised: 03/25/2011] [Accepted: 03/26/2011] [Indexed: 02/01/2023]
Abstract
Bone morphogenetic protein 7 (BMP7) has neuroprotective effects against ischemia, oxidation stress, and lipopolysaccharide, but its role on amyloid-beta (Aβ)-induced neurotoxicity in Alzheimer's disease (AD) and the underlying mechanisms remain unclear. In this study, we exposed PC12 cells to Aβ25-35 for 26 h to induce neurotoxicity, and added exogenous BMP7 at 2 h to observe the neuroprotective effects. The protective mechanisms involved, mostly related to inhibition of cell apoptosis and oxidation stress, were analyzed. In rat in vivo experiments, we bilaterally injected Aβ1-40 into the basal forebrain to simulate neuropathological processes in AD, performed the Morris water maze test to evaluate the effect of Aβ on spatial learning and memory, and explored the change of endogenous BMP7 expression in the brain. The present study demonstrated that BMP7 prevented neuronal injuries in PC12 cells induced by Aβ25-35, including cell apoptosis and morphological impairment of dendrites as well as oxidation stress. BMP7 treatment significantly protected PC12 cells against Aβ25-35-induced injury and inhibited the increasing content of the Bax gene and the decreasing activities of superoxide dismutase (SOD). Aβ1-40 bilaterally injected into the rat basal forebrain obviously inhibited the rat's spatial learning ability and memory, and significantly induced downregulation of endogenous BMP7 in the basal forebrain while upregulating it in the hippocampus. Our results suggest that BMP7 has neuroprotective effects against Aβ, which may be mediated through inhibition of Bax gene expression during cell apoptosis and elevation of SOD activities during the oxidative stress response. On the other hand, endogenous BMP7 may have a potential self-modulation capacity through negative feedback between the region of the basal forebrain and the hippocampus as a protective cytokine.
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Lehre AC, Rowley NM, Zhou Y, Holmseth S, Guo C, Holen T, Hua R, Laake P, Olofsson AM, Poblete-Naredo I, Rusakov DA, Madsen KK, Clausen RP, Schousboe A, White HS, Danbolt NC. Deletion of the betaine-GABA transporter (BGT1; slc6a12) gene does not affect seizure thresholds of adult mice. Epilepsy Res 2011; 95:70-81. [PMID: 21459558 DOI: 10.1016/j.eplepsyres.2011.02.014] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2010] [Revised: 02/02/2011] [Accepted: 02/27/2011] [Indexed: 10/18/2022]
Abstract
Gamma-aminobutyric acid (GABA) is the major inhibitory neurotransmitter in the mammalian brain. Once released, it is removed from the extracellular space by cellular uptake catalyzed by GABA transporter proteins. Four GABA transporters (GAT1, GAT2, GAT3 and BGT1) have been identified. Inhibition of the GAT1 by the clinically available anti-epileptic drug tiagabine has been an effective strategy for the treatment of some patients with partial seizures. Recently, the investigational drug EF1502, which inhibits both GAT1 and BGT1, was found to exert an anti-convulsant action synergistic to that of tiagabine, supposedly due to inhibition of BGT1. The present study addresses the role of BGT1 in seizure control and the effect of EF1502 by developing and exploring a new mouse line lacking exons 3-5 of the BGT1 (slc6a12) gene. The deletion of this sequence abolishes the expression of BGT1 mRNA. However, homozygous BGT1-deficient mice have normal development and show seizure susceptibility indistinguishable from that in wild-type mice in a variety of seizure threshold models including: corneal kindling, the minimal clonic and minimal tonic extension seizure threshold tests, the 6Hz seizure threshold test, and the i.v. pentylenetetrazol threshold test. We confirm that BGT1 mRNA is present in the brain, but find that the levels are several hundred times lower than those of GAT1 mRNA; possibly explaining the apparent lack of phenotype. In conclusion, the present results do not support a role for BGT1 in the control of seizure susceptibility and cannot provide a mechanistic understanding of the synergism that has been previously reported with tiagabine and EF1502.
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Yen T, Sparapani R, Laud P, Guo C, Nattinger A. Risk of Lymphedema After Breast Cancer Surgery: Relationship Between Surgeon Specialization and the Number of Lymph Nodes Removed. J Surg Res 2011. [DOI: 10.1016/j.jss.2010.11.429] [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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169
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Im E, Pitts TM, Kulikowski G, Tan A, Tentler JJ, Murray B, Carley W, Smeal T, Guo C, Eckhardt SG. Contribution of the epithelial-mesenchymal (EMT) phenotype to the sensitivity of colorectal cancer cell lines to the p21-activated kinase inhibitor, PF-3758309. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.4_suppl.438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
438 Background: Increased expression of p21–activated kinase (PAK) family proteins has been observed in a range of malignancies including those of breast, ovarian, colorectal (CRC), and pancreatic origin. PAK (PAK 1-6) proteins are critical mediators of cell proliferation, motility, transcription, and translation. In initial studies, we demonstrated that the PAK4 inhibitor, PF-3758309, exhibited robust single agent efficacy against selected CRC cell lines, with IC50s of less than 0.015 uM, whereas some cell lines were relatively resistant to the agent, with IC50s of greater than 1 uM. In subsequent gene array analyses, CRC cell lines sensitive or resistant to PF-3758309 exhibited overexpression of core genes associated with a mesenchymal or epithelial phenotype, respectively. Thus, the goal of this study was to assess the functional consequences of altering the expression of EMT-associated genes and to seek rational combination partners in CRC. Methods: CRC cell lines that were sensitive to PF-3758309 (IC50=0.015 uM) were transfected with selected short hairpin- (sh)RNAs or micro-(mi)RNAs that are known to regulate EMT. Semi-quantitative RT-PCR and immunoblotting were performed to confirm target knockdown. The transfected cell lines were then exposed to increasing concentrations of PF-3758309 to determine the functional role of these genes in conferring responsiveness to PF-3758309. Results: Sensitive CRC cell lines were transfected with shRNAs to Zeb1, vimentin, and caldesmon, genes that are associated with a mesenchymal phenotype. Interestingly, when the cell lines were exposed to increasing concentrations of PF- 3758309 they demonstrated a ′right shift′ towards a more resistant phenotype. Likewise, transfection with miRNA 200c, a known suppressor of Zeb1, resulted in a similar shift towards resistance. Conclusions: These data suggest that the EMT phenotype may play a functional role in determining CRC sensitivity to the PAK4 inhibitor PF-3758309, and in addition, a rational combination targeting the epithelial phenotype with epidermal growth factor receptor inhibitors, may be warranted. [Table: see text]
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Wang YK, Song CN, Wang ZL, Guo C, Tan QY. A SMA Actuated Earthworm-Like Robot. COMMUNICATIONS IN COMPUTER AND INFORMATION SCIENCE 2011. [DOI: 10.1007/978-3-642-18134-4_98] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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171
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Gong Z, Liu J, Guo C, Zhou Y, Teng Y, Liu L. Two Pairs of Neurons in the Central Brain Control Drosophila Innate Light Preference. Science 2010; 330:499-502. [DOI: 10.1126/science.1195993] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Guo C, Ahmad T, Beckly J, Cummings JRF, Hancock L, Geremia A, Cooney R, Pathan S, Jewell DP. Association of caspase-9 and RUNX3 with inflammatory bowel disease. ACTA ACUST UNITED AC 2010; 77:23-9. [DOI: 10.1111/j.1399-0039.2010.01569.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Qiu W, Sun W, Guo C, Wu Z, Ding M, Shen H. Diagnosis and microsurgery of symptomatic spontaneous spinal epidural hematoma. Ir J Med Sci 2010; 180:241-5. [PMID: 20680702 DOI: 10.1007/s11845-010-0533-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2009] [Accepted: 07/08/2010] [Indexed: 11/28/2022]
Abstract
BACKGROUND Symptomatic spontaneous spinal epidural hematoma (SSEH) is an uncommon cause of cord compression that needs emergent treatment. Without effective management of the symptomatic SSEH, irreversible severe spinal injury would be possible. OBJECTIVES We aimed to investigate the diagnosis and surgical management of symptomatic SSEH. METHODS Five cases of symptomatic SSEH with favorable neurological recovery after emergent microsurgery were prospectively analysed. RESULTS The main clinical presentations were root pain and palsy. The main manifestations of MRI were long-segment epidural lesions of high intensity on T1- and T2-weighted images without enhancement. Laminectomy via posterior approach and hematoma removal were undergone for all patients. All patients achieved full neurological recovery without complications. CONCLUSIONS MRI manifestation assisted with the main clinical symptoms may aid the preoperative diagnosis of SSEH, and the delay in obtaining preoperative Digital subtraction angiography is worthwhile, especially for those with progressive neurological deterioration.
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Paerl HW, Prufert-Bebout LE, Guo C. Iron-Stimulated N(2) Fixation and Growth in Natural and Cultured Populations of the Planktonic Marine Cyanobacteria Trichodesmium spp. Appl Environ Microbiol 2010; 60:1044-7. [PMID: 16349210 PMCID: PMC201433 DOI: 10.1128/aem.60.3.1044-1047.1994] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In light of recent proposals that iron (Fe) availability may play an important role in controlling oceanic primary production and nutrient flux, its regulatory impact on N(2) fixation and production dynamics was investigated in the widespread and biogeochemically important diazotrophic, planktonic cyanobacteria Trichodesmium spp. Fe additions, as FeCl(3) and EDTA-chelated FeCl(3), enhanced N(2) fixation (nitrogenase activity), photosynthesis (CO(2) fixation), and growth (chlorophyll a production) in both naturally occurring and cultured (on unenriched oligotrophic seawater) Trichodesmium populations. Maximum enhancement of these processes occurred under FeEDTA-amended conditions. On occasions, EDTA alone led to enhancement. No evidence for previously proposed molybdenum or phosphorus limitation was found. Our findings geographically extend support for Fe limitation of N(2) fixation and primary production to tropical and subtropical oligotrophic ocean waters often characterized by Trichodesmium blooms.
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Charlson JA, Hedin T, Sparapani R, Guo C, Nattinger A. Early discontinuation of tamoxifen and aromatase inhibitors (AIs) by postmenopausal women with early-stage breast cancer. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.524] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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