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Yang L, Ping T, Lu W, Song S, Wang J, Wang Q, Chai G, Bai Y, Chen Y. Genome-wide identification of auxin-responsive microRNAs in the poplar stem. Genes Genomics 2023:10.1007/s13258-023-01385-7. [PMID: 37336805 DOI: 10.1007/s13258-023-01385-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 04/01/2023] [Indexed: 06/21/2023]
Abstract
BACKGROUND Wood (secondary xylem) of forests is a material of great economic importance. Wood development is strictly controlled by both the phytohormone auxin and microRNAs (miRNAs). Currently, the regulatory mechanisms underlying wood formation by auxin-associated miRNAs remain unclear. OBJECTIVE This report was designed to identify auxin-responsive miRNAs during wood formation. METHODS Morphological observation of wood development in the poplar stems was performed under the treatment of different concentrations (0 mg/L, CK; 5 mg/L, Low; 10 mg/L, High) of indol-3-butyric acid (IBA). Using a small RNA sequencing strategy, the effect of IBA treatment on miRNAs expression was genome-widely analyzed. RESULTS In this study, we found that wood development of poplar was promoted by low concentration of IBA treatment but inhibited by high concentration of IBA treatment. Stringent bioinformatic analysis led to identification of 118 known and 134 novel miRNAs candidates. Sixty-nine unique developmental-related miRNAs, corresponding to 269 target genes, exhibited specific expression patterns in response to auxin, as was consistent with the influence of auxin application on wood formation. Three novel miRNAs had the most number (≥ 9) of target genes, belonging to SPL, GRF and ARF gene families. The evolutionary relationships and tissue expression patterns of 41 SPL, GRF and ARF genes in poplar were thus analyzed. Of them, four representative members and corresponding miRNAs were confirmed using RT-qPCR. CONCLUSIONS Our results may be helpful for a better understanding of auxin-induced regulation of wood formation in tree species.
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Affiliation(s)
- Lihua Yang
- College of Life Science, Inner Mongolia Agricultural University, Hohhot, 010018, China
| | - Tao Ping
- College of Resources and Environment, Qingdao Agricultural University, Qingdao, 266109, China
| | - Wenjin Lu
- College of Resources and Environment, Qingdao Agricultural University, Qingdao, 266109, China
| | - Sangfa Song
- College of Resources and Environment, Qingdao Agricultural University, Qingdao, 266109, China
| | - Jianli Wang
- Grass and Science Institute of Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China
| | - Qiao Wang
- College of Resources and Environment, Qingdao Agricultural University, Qingdao, 266109, China
| | - Guohua Chai
- College of Resources and Environment, Qingdao Agricultural University, Qingdao, 266109, China
- Academy of Dongying Efficient Agricultural Technology and Industry on Saline and Alkaline Land in Collaboration with Qingdao Agricultural University, Dongying, 257000, China
| | - Yue Bai
- Forestry College, Inner Mongolia Agricultural University, Huhhot, 010018, China.
| | - Yan Chen
- Forestry College, Inner Mongolia Agricultural University, Huhhot, 010018, China.
- College of Landscape Architecture and Forestry, Qingdao Agricultural University, Qingdao, 266109, China.
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Ping T, Shuang X, Yi W, Shuguang G, Lijun T, Mihua S, Chengwen S. The Interannual Evolution of PAHs in Columnar Sediments in Offshore Area of Changxing Island Industrial Zone, China. J AOAC Int 2020; 103:399-406. [PMID: 31540586 DOI: 10.5740/jaoacint.19-0259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Changxing Island, located in the northwest of Dalian City in Liaoning, China, is a beautiful island on the West side of the Liaodong Peninsula. Since 1980, along with the development of the economic benefits and the environmental evolution of the Changxing Island marine belt, its ecological environment has changed to a certain extent. In this paper, the interannual evolution and organic pollution of polycyclic aromatic hydrocarbons (PAHs) in borehole core samples were studied, based on the survey data of coastal substrates and sedimentation chemistry of two columnar stations (C4 and C6) in Changxing Island, China, in 2017. It was found that the distribution of PAHs in the region was controlled by sedimentary types and hydrodynamic factors. The PAH content in the vertical direction of the borehole part was at the level of the environmental background value before 1980. However, from 1981 to the present, the overall increasing trend of PAHs content was evident, and there were obvious fluctuations with the changes of the surrounding environment. In the C4 column, the total concentration of 16 PAHs was 32.8-349.0 ng/g (dry weight), and it was 22.2-81.3 ng/g (dry weight) in the C6 column. Among them, the concentration range of PAHs species composition was from high to low, followed by tricyclic, quadricyclic, bicyclic, pentacyclic, hexacyclic, and the monomer with the highest content in the sea area was tricyclic phenanthrene. The supports were thereby provided for environmental pollution research, comprehensive evaluation, environmental carrying capacity forecasting, and early warning in this region, and it was served as the basis for development and antipollution feasibility demonstration.
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Affiliation(s)
- Tao Ping
- Dalian Maritime University, College of Environmental Science and Engineering, 1 Linghai Rd, Liaoning, China 116026
| | - Xu Shuang
- Dalian Maritime University, College of Environmental Science and Engineering, 1 Linghai Rd, Liaoning, China 116026
| | - Wei Yi
- Dalian Maritime University, College of Marine Engineering, 1 Linghai Rd, Liaoning, China 116026
| | - Guo Shuguang
- Dalian Jinpu New District Agriculture Bureau, Liaoning, China 116000
| | - Tang Lijun
- Dalian Maritime University, College of Environmental Science and Engineering, Linghai Rd, Liaoning, China 116026
| | - Shao Mihua
- Dalian Maritime University, College of Environmental Science and Engineering, Linghai Rd, Liaoning, China 116026
| | - Song Chengwen
- Dalian Maritime University, College of Environmental Science and Engineering, Linghai Rd, Liaoning, China 116026
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Xiang J, Moyana T, Chen Z, Han W, Ping T, Li E. Production and Characterization of a Tumor-Specific Monoclonal Antibody Act19 Recognizing an Epitope Distinctive from Sialosyl-Tn on the TAG72 Antigen. Tumori 2018; 79:58-65. [PMID: 7684540 DOI: 10.1177/030089169307900113] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Aims A murine monoclonal antibody ACT19 directed at the TAG72 tumor-associated antigen, which was originally defined by the B72.3 antibody, was established. Methods This was done by immunizing mice with the bovine mucin followed by the selection of hybridomas secreting antibodies with the desired specificity. In order to better characterize this antibody, its immunoreactivity was compared to that of the B72.3 antibody. Results The data showed that the ACT19 antibody bound specifically to the TAG72 antigen as the B72.3 antibody did. However, there were some differences between ACT19 and B72.3. Firstly, the immunoreactivity of ACT19 for the bovine mucin was lower than that of B72.3. Secondly, the immunoreactivity of ACT19 for the TAG72 antigen was not inhibited by N-acetylgalactosamine, nor was that of B72.3. Thirdly, ACT19 did not compete the binding reactivity of B72.3 for the TAG72 antigen. This suggests that the epitope defined by ACT19 is different from the sialosyl-Tn epitope recognized by B72.3. Immunoperoxidase staining of various tumors, normal and embryonic tissues for ACT19 was carried out. For the various tumors, only adenocarcinomas from the colon and stomach showed remarkable positivity. All the normal tissues were negative, except for weak positivity involving the zona reticularis of the adrenal cortex, and intestinal goblet cells. Embryonic tissues showed a wide spectrum of positivity with staining of the small and large intestine, stomach and renal tubules. Conclusions The ACT19 antibody appears to be a useful marker for colon and stomach cancers, and this additional anti-TAG72 antibody may be useful in conjunction with the B72.3 antibody in pathology and clinical application.
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Affiliation(s)
- J Xiang
- Department of Microbiology, University of Saskatchewan, Saskatoon, Canada
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Meng Y, Dongmei L, Yanbin P, Jinju F, Meile T, Binzhu L, Xiao H, Ping T, Jianmin L. Systematic review and meta-analysis of ustekinumab for moderate to severe psoriasis. Clin Exp Dermatol 2014; 39:696-707. [PMID: 25039593 DOI: 10.1111/ced.12390] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/02/2013] [Indexed: 11/29/2022]
Affiliation(s)
- Y. Meng
- Postgraduate School of Guangxi Medical University; Zhangqiu Shandong China
| | - L. Dongmei
- Department of Laboratory Medicine; People's hospital of Zhangqiu; Zhangqiu Shandong China
| | - P. Yanbin
- Department of Dermatology; Third Affiliated Hospital of Guangxi Medical University; Nanning Guangxi China
| | - F. Jinju
- Department of Dermatology; Third Affiliated Hospital of Guangxi Medical University; Nanning Guangxi China
| | - T. Meile
- Department of Dermatology; Third Affiliated Hospital of Guangxi Medical University; Nanning Guangxi China
| | - L. Binzhu
- Department of Dermatology; Third Affiliated Hospital of Guangxi Medical University; Nanning Guangxi China
| | - H. Xiao
- Department of Dermatology; Third Affiliated Hospital of Guangxi Medical University; Nanning Guangxi China
| | - T. Ping
- Department of Dermatology; Third Affiliated Hospital of Guangxi Medical University; Nanning Guangxi China
| | - L. Jianmin
- Department of Dermatology; Third Affiliated Hospital of Guangxi Medical University; Nanning Guangxi China
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Abstract
Retropharyngeal or parapharyngeal abscesses developing after intubation are rare. This can present as surgical emergency post extubation. We report a case of retropharyngeal abscess that probably occurred as a complication of laryngeal mask insertion.
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Affiliation(s)
- E Lynn
- University Malaya Medical Centre, Malaysia
| | - T Ping
- University Malaya Medical Centre, Malaysia
| | - Y Keng
- University Malaya Medical Centre, Malaysia
| | - R Singh
- University Malaya Medical Centre, Malaysia
| | - W Kwong
- University Malaya Medical Centre, Malaysia
| | - T Soon
- University Malaya Medical Centre, Malaysia
| | - I Shaik
- University Malaya Medical Centre, Malaysia
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Hiebert L, Ping T, Ye Z, Xiang J. Orally administered unfractionated heparin reduces lung tumour incidence in a rat model. Thromb Res 2012. [DOI: 10.1016/s0049-3848(12)70095-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Thomas PA, Tracy BL, Ping T, Wickstrom M, Sidhu N, Hiebert L. Relative biological effectiveness (RBE) of 210 Po alpha-particles versus X-rays on lethality in bovine endothelial cells. Int J Radiat Biol 2009. [DOI: 10.1080/09553000210000300075] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Hiebert L, Wice S, Ping T. ORALLY ADMINISTERED HEPARIN HAS CUMULATIVE ANTITHROMBOTIC EFFECTS WHEN ADMINISTERED IN REPEATED DOSES. J Thromb Haemost 2007. [DOI: 10.1111/j.1538-7836.2007.tb01560.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Mandal AK, Ping T, Caldwell SJ, Bagnell R, Hiebert LM. Electron microscopic analysis of glucose-induced endothelial damage in primary culture: possible mechanism and prevention. Histol Histopathol 2006; 21:941-50. [PMID: 16763943 DOI: 10.14670/hh-21.941] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We previously reported that high glucose treated cultured endothelial cells (ECs) showed intercellular gaps by transmission electron microscopy (TEM). These gaps were abrogated with insulin and/or heparin treatment. Our aims were to assess the severity of injury in ECs treated with high glucose for variable duration, and to further study the protective effects of insulin and/or heparin. Cells were also treated with L-buthionine sulfoximine (BSO), a glutathione inhibitor, to help understand the mechanism of high glucose injury. Primary porcine ECs were treated with high glucose (30 mM) for 2, 6 or 10 days; and glucose plus insulin (1 U/ml), glucose plus heparin (5 microg/ml), glucose plus insulin plus heparin for 6 days. ECs were treated with BSO (0.001-0.05 mM) for 2 days. Pellets from trypsinized cells were processed for TEM. High glucose treatment revealed apoptosis or necrosis showing variable cell size, abnormal nuclei, condensation of nuclear chromatin, few mitochondria, cell membrane disruption and needle-shaped structures. Changes increased with duration of exposure. In high glucose plus heparin or insulin treated cultures at least one-half of the cells appeared normal. Most ECs were intact when treated with high glucose plus insulin plus heparin. BSO treatment showed dose-dependent changes with low doses showing apoptosis whereas higher doses revealed necrosis similar to high glucose treatment for 6 or 10 days. High glucose-induced EC injury increased with duration of exposure. These data demonstrate that high glucose injury resembles that of BSO treatment, suggesting that glutathione depletion may be involved in EC injury. Insulin and/or heparin protect against high glucose-induced injury.
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Affiliation(s)
- A K Mandal
- Division of Nephrology, Department of Medicine, University of Florida, Jacksonville, Florida, USA
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Jun ZJ, Ping T, Lei Y, Li L, Ming SY, Jing W. Prevalence of factor V Leiden and prothrombin G20210A mutations in Chinese patients with deep venous thrombosis and pulmonary embolism. ACTA ACUST UNITED AC 2006; 28:111-6. [PMID: 16630215 DOI: 10.1111/j.1365-2257.2006.00757.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Venous thromboembolism (VTE) is a common vascular disease that results in two major clinical manifestations: deep venous thrombosis (DVT) and pulmonary embolism (PE). Several genetic risk factors, especially factor V Leiden and prothrombin G20210A mutations have been reported to be related to VTE in Caucasians, but the relationship remains controversial in other populations. Thus, the objective of the present study was to compare the frequency of the two mutations and also to investigate whether acquired risk factors other than genetic mutations may play a different role in Chinese VTE patients. Thirty-five patients were diagnosed with DVT concomitant PE, 178 patients with DVT, 54 patients with PE and 102 control subjects were recruited. The mutation was determined by the polymerase chain reaction-restriction fragment length polymorphism method. Of all subjects, none was a carrier of factor V Leiden or prothrombin G20210A mutations. The frequency of surgery was significantly higher in the PE group than that in other groups. There was no significant difference among the three groups in other known risk factors. The data presented here indicate that factor V Leiden and prothrombin G20210A mutations are very rare in the Chinese population, and the genetic risk profile of VTE in the Chinese population is different from that in Caucasians.
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Affiliation(s)
- Z J Jun
- China-Japan Union Hospital, Ji Lin University, Changchun, China.
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Thomas PA, Tracy BL, Ping T, Wickstrom M, Sidhu N, Hiebert L. Relative biological effectiveness (RBE) of 210Po alpha-particles versus X-rays on lethality in bovine endothelial cells. Int J Radiat Biol 2003; 79:107-18. [PMID: 12569014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
PURPOSE Alpha-radiation from polonium-210 ((210)Po) can elevate background radiation dose by an order of magnitude in people consuming large quantities of meat and seafood, particularly caribou and reindeer. Because up to 50% of the ingested (210)Po body burden is initially found in the blood, a primary target for the short range alpha-particles is the endothelial cells lining the blood vessels. This study examined the relative biological effectiveness (RBE) of (210)Po alpha-particles versus 250 kVp X-rays in producing injury to cultured bovine aortic endothelial cells. MATERIALS AND METHODS Radiation effects on cells were measured in four different ways: the percentage viable cells by trypan blue dye exclusion, the number of live cells, the lactate dehydrogenase (LDH) release to medium and the ability to form colonies (clonogenic survival). RESULTS Comparison of dose-response curves yielded RBE values of 13.1+/-2.5 (SEM) for cell viability, 10.3+/-1.0 for live cell number and 11.1+/-3.0 for LDH activity. The RBE values for clonogenic survival were 14.0+/-1.0 based on the ratio of the initial slopes of the dose-response curves and 13.1, 9.9 and 7.7 for 50, 10 and 1% survival rate, respectively. At X-ray doses <0.25 Gy, a pronounced stimulatory effect on proliferation was noted. CONCLUSIONS Exposure to (210)Po alpha-particles was seven to 14 times more effective than X-ray exposure in causing endothelial cell damage.
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Affiliation(s)
- P A Thomas
- Toxicology Centre, University of Saskatchewan, 44 Campus Drive, Saskatoon, Saskatchewan, Canada S7N 5B3
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Hiebert LM, Wice SM, Ping T, Herr D, Laux V. Antithrombotic efficacy in a rat model of the low molecular weight heparin, reviparin sodium, administered by the oral route. Thromb Haemost 2001; 85:114-8. [PMID: 11204561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Previous studies in rats show that unfractionated heparin and the low molecular weight heparin logiparin have a dose-dependent antithrombotic effect and are found in endothelium and plasma when administered orally. Objectives of the present study were to determine if similar evidence of absorption could be observed with oral reviparin sodium. Thrombosis incidence was determined 4 h after application of 10% formalin in methanol to the exposed jugular vein. A dose-dependent antithrombotic effect was observed when 0.01 to 7.5 mg/kg (20 rats/group) was administered by stomach tube immediately following thrombus initiation. Thrombotic incidence was also significantly reduced when 0.025 mg/kg was given 4 and 2 h prior to, immediately after, and 2 and 3 h following thrombus initiation. Reviparin was recovered from endothelium and plasma in trace amounts at all doses. At 0.025 mg/kg, peak aortic endothelial reviparin concentrations were found at 1 and 2 h and peak plasma anti-Xa activity was detected at 2 h. Trace amounts of plasma TFPI were found only at 8 h after administration. Dose-dependent antithrombotic activity and recovery from endothelium and plasma support the hypothesis that orally administered reviparin sodium is absorbed.
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Affiliation(s)
- L M Hiebert
- Department of Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon, Canada.
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Hiebert LM, Ping T, Wice SM. Antithrombotic activity of orally administered low molecular weight heparin (Logiparin) in a rat model. Haemostasis 2000; 30:196-203. [PMID: 11155038 DOI: 10.1159/000054135] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Previous studies in rats demonstrated that orally administered, unfractionated bovine lung heparin is absorbed and has a dose-dependent antithrombotic effect. The objective of this study was to determine if an oral low molecular weight heparin had a similar antithrombotic effect in the same model. Thrombosis was induced in rats by application of 10% formalin in 65% methanol to the exposed jugular vein. Immediately following, saline, unfractionated heparin (3.3-60 mg/kg) or the low molecular weight heparin, Logiparin (0.025-15 mg/kg; 20-30 rats per group) was placed in the stomach and 4 h later the jugular vein was inspected for a thrombus. Compared to saline, oral Logiparin reduced the incidence of thrombosis at all doses with a dose-dependent effect suggested. A significant increase was observed in the activated partial thromboplastin time and in plasma heparin concentrations, determined by Accuclot Heptest and anti-factor Xa chromogenic assay for rats given oral Logiparin versus saline. A dose-dependent increase in plasma heparin concentration was observed when estimated by the anti-Xa chromogenic assay. Heparin was recovered in 9% of aortic endothelial samples when > or = 0.8 mg/kg Logiparin was administered. A 50% reduction in thrombosis was observed at 0.1 mg/kg for oral Logiparin versus 7.5 mg/kg for unfractionated bovine lung heparin indicating that oral Logiparin is an effective antithrombotic agent at doses lower than unfractionated heparin. Orally administered low molecular weight heparin may be useful for the prevention and treatment of thrombosis.
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Affiliation(s)
- L M Hiebert
- Department of Veterinary Physiological Sciences, University of Saskatchewan, Saskatoon, Canada.
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Hiebert LM, Wice SM, Ping T, Hileman RE, Capila I, Linhardt RJ. Tissue distribution and antithrombotic activity of unlabeled or 14C-labeled porcine intestinal mucosal heparin following administration to rats by the oral route. Can J Physiol Pharmacol 2000; 78:307-20. [PMID: 10772058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Distribution and antithrombotic activity of orally administered unfractionated porcine heparin were studied. [14C]Heparin was prepared by de-N-acetylation of porcine mucosal heparin followed by re-N-acetylation, using [14C]acetic anhydride. [14C]Heparin and (or) cold heparin (60 mg/kg) were administered by stomach tube to male Wistar rats. Blood, all levels of gut and gut contents, liver, lung, spleen, kidney, and aortic and vena caval endothelium were collected under deep anesthesia at 3, 6, 15, 30, and 60 min and 4 and 24 h (6 rats/group) after administration. Urine and feces were collected at 24 h, using metabolic cages. In three additional rats, drugs were administered in gelatin capsules. Tissues listed above and tongue, esophagus, trachea, brain, heart, thymus, bile ducts, vena caval and aortic walls, ureters, bladder, samples of muscle, skin, hair, and bone marrow were collected at 24 h. Radioactivity and chemical heparin, measured by agarose gel electrophoresis, were observed in all tissues examined as well as gut washes, plasma, urine, and feces. Radiolabel recovered was confirmed to be heparin by autoradiograms of gradient polyacrylamide electrophoretic gels. [14C]Heparin and chemical heparin in gut tissue suggest a transit time of 4 h. Porcine or bovine heparin (7.5 mg/kg), administered by stomach tube, decreased the incidence of thrombosis induced by applying 10% formalin in 65% methanol to the exposed jugular vein of rats. Heparin isolation from non-gut tissue, endothelium, urine, and plasma and the observed antithrombotic effect are consistent with oral bioavailability.
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Affiliation(s)
- L M Hiebert
- Department of Veterinary Physiological Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Canada.
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Abstract
Studies in our laboratory have demonstrated that addition of polyanions, heparin or dextran sulfate, to endothelial cell cultures decrease free radical injury. To determine if these polyanions had a similar effect on cardiomyocytes, models of free radical injury were produced in adult rat cardiomyocyte cultures by: (1) addition of hydrogen peroxide; (2) exposure to hypoxia followed by reoxygenation; or (3) exposure to medium conditioned by endothelial cells that were damaged by hypoxia-reoxygenation. All three procedures significantly decreased cell viability as measured by trypan blue exclusion and increased release of enzymes, lactate dehydrogenase and creatine kinase, into cell medium when compared to control cultures. Addition of dextran sulfate or heparin to medium (5 microg/ml) prior to cell injury significantly increased cell viability and decreased release of enzymes when cells were damaged by the above protocols. Heparin was significantly less protective than dextran sulfate when cells were injured by hydrogen peroxide or hypoxia-reoxygenation but not when conditioned medium from damaged endothelial cells was added to cardiomyocytes. These results indicate that polyanions are protective of cardiomyocytes as well as endothelium. This protective effect may contribute to the beneficial effects of heparin on the cardiovascular system.
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Affiliation(s)
- L Hiebert
- Department of Veterinary Physiological Sciences, University of Saskatchewan, Saskatoon, Canada
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Ping T, Smith HL. Determinants of induced abortion and their policy implications in four counties in north China. Stud Fam Plann 1995; 26:278-86. [PMID: 8571442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A retrospective survey conducted in four counties in North China in 1991-92 shows that the probability of aborting a pregnancy is strongly related to parity. No induced abortions are found prior to the first live birth, and almost universal abortion is shown after the second. Women had a high risk of undergoing abortion after their first live birth because most (82 percent) had become pregnant again without meeting official requirements for late second births with long spacing between births. The likelihood that a pregnancy will be aborted is strongly determined by official family planning policy and regulations. Individual and household socioeconomic status plays a relatively insignificant role. Great variation in the prevalence of induced abortion exists at the county and village levels. In recent years, the incidence of induced abortion has increased among women with one living child. Even a two-child policy, with late childbearing and spacing, can have high social and health costs in a country where childbearing is universal and begins relatively early.
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Affiliation(s)
- T Ping
- Institute of Population Research, Peking University, Beijing, People's Republic of China
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Ping T. Breast-feeding patterns and correlates in Shaanxi, China. Asia Pac Popul J 1990; 5:57-70. [PMID: 12283349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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