Li-Li Su

Sun Yat-Sen University, Shengcheng, Guangdong, China

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Publications (3)3.94 Total impact

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    ABSTRACT: To investigate the prevalence and risk factors of asymptomatic intracranial artery stenosis in middle-aged and elderly population in the community of Foshan city, Guangdong province. Subjects from residential communities were chosen through Cluster sampling method. Physical data and history were collected. Serum fasting glucose, total cholesterol and triglycerides concentrations were tested with venous blood samples. Intracranial artery stenosis was diagnosed by transcranial Doppler (TCD). Data was analyzed by the software SPSS 18.0. 1405 subjects met the inclusive criteria, among which 163 (11.6%) were found one (7.4%) or more (4.2%) stenotic arteries, and the standardized rate was 10.3%. 9.89% of the SICA, and 3.05%, 2.29%, 1.59%, 1.38%, 0.89% of basilar artery, middle cerebral artery, anterior lerebral artery, vertebral artery, posterior cerebral artery were found stenotic respectively. Data from the age-stratified analysis showed that the prevalence in these above 70 (27.8%) was significantly higher than that under age 70 (7.5%) (P = 0.000). Single factor and logistic regression analysis demonstrated the history of diabetes mellitus and elevated systolic pressure present were significantly different between stenotic group and the non-stenotic group (P = 0.000, P = 0.000), which were the independent risk factors of asymptomatic stenosis of intracranial arteries (OR = 2.362, 95%CI: 1.194 - 4.674;OR = 1.024, 95%CI: 1.016 - 1.031). Comparatively high prevalence of asymptomatic intracranial artery stenosis in middle-aged and aged community population was found in the Southern part of China, especially among the age group above 70. History of diabetes and elevated systolic pressure seemed to be the independent risk factors of asymptomatic stenosis of intracranial arteries.
    No preview · Article · May 2011 · Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi
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    ABSTRACT: To investigate the relationship between abdominal obesity and intracranial artery stenosis and the underlying mechanism. By cluster sampling, 1405 adult Han people were selected from the residential communities. Among them, 1035 people conformed to the inclusion criteria. Medical history was documented and body height, body weight, waist circumference, hip circumference and blood pressure were measured. Venous blood samples were collected to detect the serum concentrations of fasting glucose, total cholesterol and triglycerides. Serum nitric oxide (NO) level was determined by cadmium reduction method. Middle cerebral artery stenosis (MCAS) was diagnosed by transcranial Doppler. The SPSS 11.0 software package was used for data analysis. MCA stenosis was found in 66 subjects (6.4%). Univariate analysis showed history of hypertension, history of ischemic heart disease, systolic blood pressure and diastolic blood pressure were the risk factors for MCAS and waist-to-hip ratio (WHR) was a risk factor only in males. Logistic regression demonstrated history of hypertension was an independent risk factor for MCAS both in males and females (P = 0.011, P = 0.009) and WHR for MCAS only in males (P = 0.030). Among males and females over 55 years old, the NO levels were higher in people with a higher WHR and the difference was statistically significant (P = 0.042, P = 0.016); however the NO levels for people with a varying WHR showed statistically insignificant difference among females under 55 years old (P = 0.228). Hypertension and abdominal obesity are important risk factors for MCAS. Endothelial cell dysfunction and an elevated level of oxidative stress may be involved in the atherogenetic mechanism of abdominal obesity while estrogen may play a protective role in it.
    No preview · Article · Mar 2010 · Zhonghua yi xue za zhi
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    ABSTRACT: Xanthomonas campestris pv. campestris is the pathogen of black rot of cruciferous plants. The pathogenicity of the pathogen depends on the type III secretion system (T3SS) that translocates directly effector proteins into plant cells, where they play important roles in the molecular interaction between the pathogen and its hosts. The T3SS of Xanthomonas spp. is encoded by a cluster of hypersensitive response and pathogenicity (hrp) genes. It has been demonstrated that the expression of hrp genes and some type III secreted (T3S)-effector genes is coactivated by the key hrp regulatory protein HrpX. The regulation by HrpX can be mediated by the binding of HrpX protein to a cis-regulatory element named the plant-inducible promoter (PIP) box present in the promoter region of HrpX-regulated genes. A genome screen revealed that X. campestris pv. campestris 8004 possesses 56 predicted genes with the PIP box. Nine of these genes have been shown to encode T3S effectors, Hrp, and Hrp-associated proteins. In this study, we employed an established T3S effector translocation assay with the hypersensitive-reaction-inducing domain of X. campestris pv. campestris AvrBs1 as a reporter to characterize the remaining 47 genes with the PIP box and showed that 6 of them, designated as XopXccE1, XopXccP, XopXccQ, XopXccR1, XopXccLR, and AvrXccB, harbor a functional translocation signal in their N-terminal regions, indicating that they are T3S effectors of X. campestris pv. campestris. We provided evidence to demonstrate that all these effectors are expressed in an HrpX-dependent manner and their translocation into plant cells relies on the translocon protein HrpF and the chaperone HpaB. Mutational analyses demonstrated that all these effectors, except AvrXccB, are individually required for full virulence and growth of X. campestris pv. campestris in the host plant Chinese radish.
    Full-text · Article · Nov 2009 · Molecular Plant-Microbe Interactions