Publications by authors named "Han-Zhi Wang"

13 Publications

  • Page 1 of 1

Chronic Exposure to Hypoxia Inhibits Myelinogenesis and Causes Motor Coordination Deficits in Adult Mice.

Neurosci Bull 2021 Jul 22. Epub 2021 Jul 22.

Department of Histology and Embryology, Chongqing Key Laboratory of Neurobiology, Brain and Intelligence Research Key Laboratory of Chongqing Education Commission, Third Military Medical University, Chongqing, 400038, China.

Exposure to chronic hypoxia is considered to be a risk factor for deficits in brain function in adults, but the underlying mechanisms remain largely unknown. Since active myelinogenesis persists in the adult central nervous system, here we aimed to investigate the impact of chronic hypoxia on myelination and the related functional consequences in adult mice. Using a transgenic approach to label newly-generated myelin sheaths (NG2-CreER; Tau-mGFP), we found that myelinogenesis was highly active in most brain regions, such as the motor cortex and corpus callosum. After exposure to hypoxia (10% oxygen) 12 h per day for 4 weeks, myelinogenesis was largely inhibited in the 4-month old brain and the mice displayed motor coordination deficits revealed by the beam-walking test. To determine the relationship between the inhibited myelination and functional impairment, we induced oligodendroglia-specific deletion of the transcription factor Olig2 by tamoxifen (NG2-CreER; Tau-mGFP; Olig2 fl/fl) in adult mice to mimic the decreased myelinogenesis caused by hypoxia. The deletion of Olig2 inhibited myelinogenesis and consequently impaired motor coordination, suggesting that myelinogenesis is required for motor function in adult mice. To understand whether enhancing myelination could protect brain functions against hypoxia, we treated hypoxic mice with the myelination-enhancing drug-clemastine, which resulted in enhanced myelogenesis and improved motor coordination. Taken together, our data indicate that chronic hypoxia inhibits myelinogenesis and causes functional deficits in the brain and that enhancing myelinogenesis protects brain functions against hypoxia-related deficits.
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http://dx.doi.org/10.1007/s12264-021-00745-1DOI Listing
July 2021

A comprehensive exploration on pollution characteristics and health risks of potentially toxic elements in indoor dust from a large Cu smelting area, Central China.

Environ Sci Pollut Res Int 2021 Jun 5. Epub 2021 Jun 5.

State Environmental Protection Key Laboratory of Urban Environment and Ecology, Ministry of Ecology and Environment, South China Institute of Environmental Sciences, Guangzhou, 510655, China.

Large-scale smelting activities release large amounts of potentially toxic elements (PTEs) in fine particles. These particles floating in the air eventually settle on leaves, roads, and even indoors. In smelting areas, indoor environments are generally considered relatively safe. However, these areas are not taken seriously and need to be assessed. This paper systematically studied pollution characteristics, main sources and health risks of ten potentially toxic elements, PTEs (Mn, Ni, Cu, Zn, Hg, Cd, As, Cr, Pb, and Tl), of dust samples from different indoor environments in smelting areas using various methods. Therefore, this study analyzed dust samples from 35 indoor environments. The enrichment factors showed that the indoor dust samples were extremely enriched by Cd and Cu and significantly enriched by Hg, Pb, As, and Zn. The result of the spatial distribution showed that the high-value PTEs were mainly distributed near the Cu smeltery. Three sources were quantitatively assigned for these PTEs, and they were industrial smelting and traffic activities (44.40%), coal-fired activities (18.11%), and natural existence (37.49%). Based on the calculation of health risk, the value of THI for children was 7.57, indicating a significant non-carcinogenic risk. For carcinogenic risk, the values of TCR for children and adults were 2.91×10 and 2.97×10, respectively, which were much higher than the acceptable risk value 1×10. Combining health risk assessment with source discrimination, we found that the industrial discharges and traffic activities were the most main source of non-cancer and cancer risks. Therefore, smelting activities should be more strictly monitored, and traffic emission management should be strengthened.
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http://dx.doi.org/10.1007/s11356-021-14724-6DOI Listing
June 2021

Transcutaneous Electrical Acupoint Stimulation Improves the Outcomes of In Vitro Fertilization: A Prospective, Randomized and Controlled Study.

Explore (NY) 2017 Sep - Oct;13(5):306-312. Epub 2017 Jun 30.

Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China. Electronic address:

Objectives: To explore whether transcutaneous electrical acupoint stimulation (TEAS) can improve the outcomes of in vitro fertilization (IVF).

Design: A prospective, randomized, and controlled study.

Setting: IVF center in a university hospital.

Participants: Four hundred and eighty-one infertile patients with bilateral tubal blockage who were referred for IVF. Patients were randomized into four groups.

Intervention: TEAS was administered for 30min, respectively, at 24h before TVOR and two hours before ET. The acupoints included SP10 (Xuehai, bilateral), SP8 (Diji, bilateral), LR3 (Taichong, bilateral), ST36 (Zusanli, bilateral), EX-CA1 (Zigong, bilateral), RN4 (Guanyuan), PC6 (Neiguan, bilateral), and RN12 (Zhongwan). Based on different frequencies of TEAS, patients were grouped into a TEAS-2Hz group, a TEAS-100Hz group and a TEAS-2/100Hz group. Patients in the control group only received routine IVF treatment and no TEAS was applied on them.

Primary And Secondary Outcome Measures: The number of mature oocytes, normally fertilized oocytes and good-quality embryos were used to evaluate oocyte developmental competence of the patients. Data of clinical pregnancy rate (CPR), implantation rate (IR), and live birth rate (LBR) were also obtained. The levels of neuropeptide Y (NPY), transforming growth factor alpha and granulocyte colony-stimulating factor in the follicular fluids were measured with enzyme-linked immunosorbent assay (ELISA).

Results: No significant differences were found between the control, TEAS-2Hz, TEAS-100Hz and TEAS-2/100Hz groups on the numbers of metaphase II oocytes, normally fertilized zygotes, early cleavage embryos or good quality embryos (P > .05). However, the CPR, IR and LBR of the TEAS-2/100Hz group were significantly higher than those of the other groups, respectively (P < .05). The NPY levels in the follicular fluids of TEAS-2/100Hz group were significantly higher than those of the other groups (P < .05).

Conclusion: TEAS using a frequency of 2/100Hz could help to improve the IVF outcomes partly by increasing NPY levels in the follicular fluids.
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http://dx.doi.org/10.1016/j.explore.2017.06.004DOI Listing
August 2018

[Progress on Correlation between the Expression of CDK5 and Brain Injury Time].

Fa Yi Xue Za Zhi 2016 Feb;32(1):58-60

Cyclin-dependent kinase 5 (CDK5) is a member of cyclin-dependent kinase family, which does not directly regulate cell cycle. Through phosphorylation of target protein, CDK5 plays an irreplaceable role in the development, reparation and degeneration of neurons. Brain injury refers to the organic injury of brain tissue caused by external force hit on the head. Owing to the stress and repair system activated by our body itself after injury, various proteins and enzymes of the brain tissues are changed quantitatively, which can be used as indicators for estimating the time of injury. This review summarizes the progress on the distribution, the activity mechanism and the physiological effects of CDK5 after brain injury and its corresponding potential served as a marker for brain injury determination.
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February 2016

[Expression of p35 and p25 after Focal Cerebral Contusion in Rat].

Fa Yi Xue Za Zhi 2015 Apr;31(2):93-6

Objective: To study the expression of p35 and p25 in rat after focal cerebral contusion and to provide experimental data for estimating brain injury time.

Methods: Fifty adult male SD rats were randomly divided into 0 h, 6 h, 12 h, 24 h, 3 d, 5 d, 7 d, 10 d after focal cerebral contusion, control and sham-operated groups (5 rats each group). The focal cerebral contusion rat model was established. The expression of p35 and p25 protein of the damage peripheral zone in brain were detected by HE staining, immunohistochemistry and Western blotting at different injury time.

Results: A large number of p35 protein and a small amount of p25 protein were expressed in control group and sham-operated group. After focal cerebral contusion, p35 presented unimodal change with time and p25 presented bimodal changes with time.

Conclusion: Expression of p35 and p25 showed different regularity with good time correlation, which could help to estimate the brain injury time.
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April 2015

[The role of Wnt/beta-catenin signal pathway in the myelination and remyelination].

Sheng Li Ke Xue Jin Zhan 2012 Feb;43(1):71-4

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February 2012

Time-specific blockade of PDGFR with Imatinib (Glivec®) causes cataract and disruption of lens fiber cells in neonatal mice.

Virchows Arch 2011 Mar 23;458(3):349-56. Epub 2010 Dec 23.

Institute of Cardiovascular Disease of PLA, Xinqiao Hospital, Third Military Medical University, Chongqing, 400038, China.

This study aimed at investigating the response of lens epithelial cells in postnatal mice to Imatinib (Glivec®, a potent inhibitor of platelet-derived growth factor receptor (PDGFR)) treatment. Mouse eyes were sampled 10 days after administration of Imatinib (0.5 mg·g(-1)·day(-1)) for 3 days, at either 7, 14, or 21 days postpartum. Structural changes of lens were revealed by routine H.E. staining. Levels of proliferation and apoptosis were revealed by BrdU incorporation and terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay, respectively, and immunofluorescent staining with anti-PDGFRα antibody was carried out on the sections of eyeball. PDGFRα and p-PDGFRαprotein levels were evaluated by Western blot. Our results indicated that administration of Imatinib led to blockade of PDGFR signaling. Formation of cataracts was found only in those mice where treatment started from 7 days postpartum (P7), but was not observed in those samples from P14 nor P21. Fiber cells were disorganized in cataract lens core as observed histologically, and migration of epithelial cells was also inhibited. No apoptosis was detected with the TUNEL method. Our results indicated blockade of PDGFR at the neonatal stage (P7) would lead to cataracts and lens fiber cells disorganization, suggesting that PDGFR signaling plays a time-specific and crucial role in the postnatal development of lens in the mouse, and also may provide a new approach to produce a congenital cataract animal model.
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http://dx.doi.org/10.1007/s00428-010-1024-3DOI Listing
March 2011

[Transcriptional regulation of oligodendroglia development and differentiation].

Sheng Li Ke Xue Jin Zhan 2009 Oct;40(4):353-6

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October 2009

Apoptosis of interstitial cells of Cajal, smooth muscle cells, and enteric neurons induced by intestinal ischemia and reperfusion injury in adult guinea pigs.

Virchows Arch 2009 Apr 12;454(4):401-9. Epub 2009 Feb 12.

Department of Histology and Embryology, Third Military Medical University, Chongqing 400038, China.

This study aimed at evaluating whether apoptosis of interstitial cells of Cajal (ICC), smooth muscle cells (SMC), and enteric neurons was involved in a guinea pig model of intestinal ischemia and reperfusion injury. The small intestinal segments were resected at either 6 (I60/R6h) and 12 h (I60/R12h) or 7 (I60/R7d) to 14 (I60/R14d) days after 60 min intestinal ischemia in the adult guinea pigs and studied by immunohistochemistry with anti-Kit, 5-bromo-2'-deoxyuridine (BrdU), alpha-smooth muscle actin, vimentin, and beta-tublin III antibodies. Also, apoptosis was tested by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) method. In the I60/R12h injury, there was a approximately 50% decrease of Kit+ cells in cell numbers at the level of myenteric plexus and a number of Kit-/vimentin-positive cells were labeled by TUNEL. Also, a few SMC and enteric neurons were TUNEL positive. The Kit+ ICC recovered to normal and a number of Kit-/BrdU-double-positive cells were observed in the I60/R14d group. Our results indicated that the intestinal I/R injury could lead to apoptosis of ICC, SMC, and enteric neurons which may contribute to the gastrointestinal motility disorders, and proliferation was involved in the recovery of ICC.
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http://dx.doi.org/10.1007/s00428-009-0739-5DOI Listing
April 2009

Morphological changes of cholinergic nerve fibers in the urinary bladder after establishment of artificial somatic-autonomic reflex arc in rats.

Neurosci Bull 2007 Sep;23(5):277-81

Department of Neurobiology, Third Military Medical University, Chongqing 400038, China.

Objective: To establish an artificial somatic-autonomic reflex arc in rats and observe the following distributive changes of neural fibers in the bladder.

Methods: Adult Sprague-Dawley rats were randomly divided into three groups: control group, spinal cord injury (SCI) group, and reinnervation group. DiI retrograde tracing was used to verify establishment of the model and to investigate the transport function of the regenerated efferent axons in the new reflex arc. Choline acetyltransferase (ChAT) in the DiI-labeled neurons was detected by immunohistochemistry. Distribution of neural fibers in the bladder was observed by acetylcholine esterase staining.

Results: DiI-labeled neurons distributed mainly in the left ventral horn from L3 to L5, and some of them were also ChAT-positive. The neural fibers in the bladder detrusor reduced remarkably in the SCI group compared with the control (P < 0.05). After establishment of the somatic-autonomic reflex arc in the reinnervation group, the number of ipsilateral fibers in the bladder increased markedly compared with the SCI group (P < 0.05), though still much less than that in the control (P < 0.05).

Conclusion: The efferent branches of the somatic nerves may grow and replace the parasympathetic preganglionic axons through axonal regeneration. Acetylcholine is still the major neurotransmitter of the new reflex arc. The controllability of detrusor may be promoted when it is reinnervated by the pelvic ganglia efferent somatic motor fibers from the postganglionic axons.
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http://dx.doi.org/10.1007/s12264-007-0041-yDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5550575PMC
September 2007

[Changes of serum cardiotrophin I and cystatin C in preeclampsia and clinical significance thereof].

Zhonghua Yi Xue Za Zhi 2006 Dec;86(45):3190-2

Women's Hospital, School of Medicine, Zhejiang University, Hangzhou 310006, China.

Objective: To investigate the changes and of serum cardiotrophin I (cTN I) and cystatin C in preeclampsia clinical significance thereof.

Methods: Peripheral blood samples were collected from 40 women with preeclampsia, aged 29 (18 - 39), with the medium gestational age of 35 weeks, and 40 age- and gestational age-matched controls. Serum cTN I and cystatin C were determined with ELISA and serum levels of creatinine kinase, creatinine, and uric acid were assayed by automatic biochemical analyzer. Comparison was made between the 2 groups.

Results: The serum cTn I of the preeclampsia group was 0.59 microg/L +/- 0.42 microg/L, significantly higher than that of the control group (0.09 microg/L +/- 0.22 microg/L P < 0.001), and the serum cystatin C of the preeclampsia group was 1.64 mg/L +/- 0.47 mg/L, significantly higher than that of the control group (1.08 mg/L +/- 0.19 mg/L, P < 0.001). And the serum cardiotrophin I and cystatin C concentrations of the patients with severe preeclampsia were 0.66 microg/L +/- 0.40 microg/L and 1.72 mg/L +/- 0.46 mg/L respectively, both significantly higher than those of the patients with mild preeclampsia (0.17 microg/L +/- 0.26 microg/L and 1.21 mg/L +/- 0.37 mg/L respectively, P < 0.001 and 0.05 respectively).

Conclusion: Serum cTn I and cystatin C levels are elevated in preeclampsia and the elevation is associated with the severity of preeclampsia, suggesting that serum concentrations of cTn I and cystatin C are useful markers in the early diagnosis of cardiac and renal injury in patients of preeclampsia.
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December 2006

[Expression of Fas and FasL in serum and placenta of preeclamptic pregnancy and its significance].

Zhejiang Da Xue Xue Bao Yi Xue Ban 2005 Nov;34(6):499-502

The Affiliated Obstetrics and Gynecology Hospital, College of Medicine, Zhejiang University, Hangzhou 310006, China.

Objective: To observe the serum and placental levels of FAS and FASL in preeclampsia (PE) and to study its relationship with the disease.

Methods: Forty women with preeclampsia and 39 healthy pregnant women were recruited and samples of serum and placentas were collected. The expression of Fas and FasL in placentas was detected with Western blot and the concentration of soluble Fas and FasL in serum was detected with ELISA method.

Result: Serum levels of soluble Fas in PE group were significantly higher than those of healthy pregnant women (2.11+/-0.95 mg/L compared with 1.57+/-0.60 mg/L, P<0.05), and serum levels of soluble FasL in PE group were also significantly higher than those in controls (4.43+/-1.90 g/L compared with 3.48+/-1.53 g/L, P<0.01). There were no significant differences in Fas and FasL levels in placentas between PE group and healthy pregnant women (P>0.05 for both).

Conclusion: The elevated serum Fas and FasL levels are closely associated with preeclampsia, which may play an important role in the pathogenesis of the disease.
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November 2005

[Imbalance of serum T helper 1- and 2-type cytokines in preeclampsia and gestational hypertension].

Zhejiang Da Xue Xue Bao Yi Xue Ban 2005 Nov;34(6):488-91

The Affiliated Obstetrics and Gynecology Hospital, College of Medicine, Zhejiang University, Hangzhou 310006, China.

Objective: To investigate the changes in serum levels of Th1- (IL-2 and TNF-alpha) and Th2-type cytokines (IL-10) and the ratios of Th1/Th2 (IL-2/IL-10 and TNF-alpha/IL-10) in preeclampsia and in gestational hypertension.

Methods: Levels of IL-2, IL-10 and TNF-alpha were determined with radioimmunoassay in serum samples from 22 women with preeclampsia, 15 women with gestational hypertension and 32 normal term pregnant women. The Th1/Th2 ratios were calculated accordingly.

Result: There were no significant differences in serum levels of IL-2, IL-10 and TNF-alpha (P>0.05 for all) among normal pregnancy, gestational hypertension and preeclampsia. The ratio of serum IL-2/IL-10 was significantly higher in preeclampsia than that in controls (P < 0.05), and the ratio of TNF-alpha/IL-10 significantly higher in patients with preeclampsia than that in either controls or gestational hypertension (P<0.025 for both).

Conclusion: Alterations of serum cytokine balance with predominance of Th1 immunity were observed in preeclampsia. These associations may offer insight into the pathogenesis of preeclampsia.
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November 2005
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