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Wen J, Wu Y, Zhu X, Lan M, Li X. Influence mechanism of plant litter mediated reduction of iron and sulfur on migration of potentially toxic elements from mercury-thallium mine waste. Environ Pollut 2023; 332:121742. [PMID: 37121301 DOI: 10.1016/j.envpol.2023.121742] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 04/09/2023] [Accepted: 04/28/2023] [Indexed: 06/17/2023]
Abstract
The decomposition of plant litter in soil changes soil nutrient content and plays an important role in regulating soil pH and availability of potentially toxic elements (PTEs). However, there remains limited studies on the mechanism under which litter influences the transport of PTEs in the process of ecological restoration. This study examined the effect of plant litter decomposition mediated reduction of iron and sulfur components on migration of PTEs from mercury-thallium mine waste. The results showed that the four kinds of litter alleviated the acidity of the waste, especially the Bpa and Tre litter. The nitro and nitroso groups produced by the decomposition of the litter were adsorbed onto the waste, thereby providing an electron transfer medium for iron reducing microorganisms, such as Geobacter. This promoted the reduction and release of Fe3+ to Fe2+ and reduced the electronegativity (El) value of waste. The reduced El promoted the adsorption of metal cations such as Hg and Tl to maintain electrical neutrality. However, it was not conducive to the adsorption of oxygen containing anions of As and Sb. An increase in litter resulted in an increase in reductivity of mercury-thallium mine waste. This maintained the reduction of Fe3+ to Fe2+ and changed or destroyed the structure of silicate minerals. PTEs, such as Tl, Hg, As, and Sb, were released, resulting in reductions in their residual fraction. However, the strong reduction conditions, especially the decomposition of Bpa, caused part of the released Hg(II) combining with S2- produced by the reduction of SO42- to form insoluble HgS, thereby reducing its migration. The findings could provide a theoretical basis to guide the situ-control and ecological restoration of PTEs in waste slag site.
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Affiliation(s)
- Jichang Wen
- Institute of New Rural Development, Guizhou University, Guiyang, 550025, China; Guizhou Karst Environmental Ecosystems Observation and Research Station, Ministry of Education, Guiyang, 550025, China
| | - Yonggui Wu
- College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China; Guizhou Karst Environmental Ecosystems Observation and Research Station, Ministry of Education, Guiyang, 550025, China.
| | - Xinwei Zhu
- College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China
| | - Meiyan Lan
- College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China
| | - Xinying Li
- College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China
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Feng M, Yin Q, Qi Y, Lu L, Lan M, Xin L, Ming F, Jun Z, Fang L, Wang W, Lang J. Low-Dose Ultra-Fractionated Radiotherapy as a Chemosensitizer of Neoadjuvant Chemotherapy for Locally Advanced Nasopharyngeal Carcinoma: A Preliminary Results of the Phase II Trial. Int J Radiat Oncol Biol Phys 2021. [DOI: 10.1016/j.ijrobp.2021.07.1122] [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: 10/20/2022]
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Feng M, Yan L, Du X, Wang H, Ren J, Wang M, Yin Q, Lai X, Li L, Lan M, Lu S, Huang Y, Li F, Xu X, Wang W, Lang J. 873P Early efficacy prediction of nasopharyngeal carcinoma based on 3D-ADC acquired during radiotherapy: A phase II prospective study. Ann Oncol 2021. [DOI: 10.1016/j.annonc.2021.08.1283] [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: 10/20/2022] Open
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Liu H, Yang K, Luo L, Lu Q, Wu Y, Lan M, Luo Y, Liang W. Study on bioleaching of heavy metals and resource potential from tannery yard sludge. Environ Sci Pollut Res Int 2021; 28:38867-38879. [PMID: 33745044 DOI: 10.1007/s11356-021-13425-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 03/09/2021] [Indexed: 06/12/2023]
Abstract
Tannery sludge that has accumulated in the natural environment of a tannery industrial zone for a long time contains large amounts of toxic heavy metal elements such as Cr, which has a serious impact on the surrounding environment. This study used indigenous acidophilic sulfur-oxidizing bacteria from local tannery wastewater treatment plants to examine the effects of bioleaching on the removal of heavy metals in local tannery sludge accumulated in the natural environment. The effect of pre-oxygenation on bioleaching was investigated, and trends of sludge dewaterability during bioleaching and changes in the total amount of heavy metals, total nitrogen (TN), and total phosphorus (TP) during bioleaching were determined. Changes in the contents of different bound forms of heavy metals in tannery yard sludge during the bioleaching process were revealed. The experimental results showed that pre-oxygenation treatment of tannery yard sludge can shorten the bioleaching period (by at least 4 days) and improve the removal efficiency of all heavy metals. To ensure sludge dewaterability, the pH of the leaching system at the end of the bioleaching must not be lower than 1.67. The main components of heavy metals were stable in the tannery yard sludge, which critically affected the final removal efficiency of all heavy metals. The dissolution process of heavy metals showed that the morphology of heavy metals changed from stable to unstable forms in the bioleaching process, further dissolving into the liquid phase to be removed. In this experiment, the removal efficiency of all heavy metals in the tannery yard sludge was higher than 88.49%, and these heavy metals had good stability in morphology (the stable forms accounted for more than 87% of the total). In addition, the TN content in the remaining sludge was 27.9 g/kg, which is much higher than fertilizer TN requirements, indicating a high potential for resource utilization. Therefore, the method of bioleaching to remove heavy metals in tannery yard sludge for reuse is worthy of in-depth study and promotion.
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Affiliation(s)
- Hang Liu
- College of Resources and Environment Engineering, Guizhou University, Guiyang, 550025, China
| | - Kaizhi Yang
- College of Resources and Environment Engineering, Guizhou University, Guiyang, 550025, China
| | - Lingfeng Luo
- College of Resources and Environment Engineering, Guizhou University, Guiyang, 550025, China
| | - Qian Lu
- College of Resources and Environment Engineering, Guizhou University, Guiyang, 550025, China
| | - Yonggui Wu
- College of Resources and Environment Engineering, Guizhou University, Guiyang, 550025, China.
- Institute of Applied Ecology Guizhou University, Guiyang, 550025, China.
- Guizhou Karst Environmental Ecosystem Observation and Research Station, Ministry of Education, Guiyang, 550025, China.
| | - Meiyan Lan
- College of Resources and Environment Engineering, Guizhou University, Guiyang, 550025, China
| | - Youfa Luo
- College of Resources and Environment Engineering, Guizhou University, Guiyang, 550025, China
| | - Wan Liang
- Shanghai Guohui Environmental Technology Group Co., Ltd., Shanghai, 201100, China
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Feng M, Yin Q, Qi Y, Li L, Lan M, Lai X, Fan M, Zhang J, Li F, Wang W, Lang J. PO-0978 Low-dose radiotherapy as a chemosensitizer of neoadjuvant chemotherapy for LA-NPC: a phase II trial. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)07429-6] [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: 10/20/2022]
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Liu B, Jia N, Wei HL, Lan M, Liu JM, Xue YZ. Knockdown of p66ShcA activates Nrf2 pathway to protect cardiomyocytes from oxidative stress and inflammation induced by H2O2. Eur Rev Med Pharmacol Sci 2021; 24:6994-7001. [PMID: 32633393 DOI: 10.26355/eurrev_202006_21691] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE Oxidative stress and inflammation are the most common causes of myocardial ischemia and hypoxia. This article focuses on the effect of p66ShcA on H2O2-induced cardiomyocytes. MATERIALS AND METHODS The p66ShcA knockdown model of H9c2 cells was constructed by plasmid transfection. After treatment of different groups with H2O2, oxidative stress-related factors and inflammatory factors were detected. RESULTS The expressions of SOD1, SOD2, GPX1, and GPX3 in H2O2 cells were significantly decreased, IL-1β and IL-6 expression were significantly increased, while p66ShcA siRNA negative group could promote the expression of SOD1, SOD2, GPX1, and GPX3, inhibit the expression of IL-1β and IL-6 significantly, and activates the Keap1/Nrf2 pathways. CONCLUSIONS Knockdown of p66ShcA can activate Keap1/Nrf2 pathway, which inhibits H2O2-induced oxidative stress and inflammation in H9c2 cells.
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Affiliation(s)
- B Liu
- Department of Cardiology, Beijing Hospital, National Center of Gerontology, Beijing, China.
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Moltini A, Lan M, Pasquier L, Labadie M. Infirmiers assistants de réponse toxicologique : un nouveau métier ? Toxicologie Analytique et Clinique 2021. [DOI: 10.1016/j.toxac.2020.10.065] [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: 10/22/2022]
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Li Y, Lan M, Peng X, Zhang Z, Lang J. Weighted Gene Co-Expression Network Analysis Combined with Machine Learning to Identify Prognostic Biomarkers for Cervical Squamous Cell Carcinoma. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.080] [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: 10/26/2022]
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Lan M, Yang XB, Liu LQ. [Comparative study on visual fatigue caused by watching liquid crystal display and projection display]. Zhonghua Yan Ke Za Zhi 2019; 55:595-600. [PMID: 31422638 DOI: 10.3760/cma.j.issn.0412-4081.2019.08.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Objective: To explore the effect of different types of visual display terminals (VDT) on visual fatigue. Methods: A total of 68 subjects were enrolled and divided into flat screen group, metal screen group and glass bead screen group. The subjects watched a video in the same environment for 60 minutes. Before and after watching, they were asked to fill in a visual fatigue rating scale and underwent visual function examinations. The blink rate of subjects was recorded during the experiment. Results: After watching the video, for the metal screen, glass bead screen, and flat screen group respectively: (1)The median (interquartile range, IQR) of visual fatigue rating increased significantly (before: 1.0 (1.2), 1.3 (1.6), 0.5 (0.9); after: 2.1 (1.9), 2.1 (1.7), 1.2 (1.0); Z=-4.72, -4.83, -3.75; all P<0.05). (2) The median (IQR) of blink frequency increased significantly (before: 11.5 (10.6), 15.3 (11.9), 7.0 (13.0) times/minute; after: 15.0 (13.0), 17.0 (16.0), 15.0 (12.0) times/minute; Z=-2.64, -2.74, -4.12; all P<0.05). (3) The mean (±standard deviation) of critical flicker fusion frequency (CFF) decreased significantly [before: (35.76±2.98), (35.84±2.79), (35.44±2.21) Hz; after: (35.09±2.78), (34.94±2.67), (34.57±2.33) Hz; t=-2.64, -2.38, -4.12; all P<0.05). (4)The median (IQR) of near point of convergence (NPC) became significantly larger [before: 3.9 (2.6), 4.0 (2.5), 4.3 (2.7) cm; after 5.4 (3.8), 4.8 (2.7), 6.1 (3.9) cm; Z=-3.39, -2.27, -3.36; all P<0.05]. (5)The median of negative relative accommodation (NRA) reduced significantly [before: 2.00 (0.50), 2.00 (0.56), 2.00 (0.25) cm; after 1.75 (0.50), 1.75 (0.25), 1.75 (0.50) cm; Z=-1.98, -2.09, -2.53; all P<0.05]. Meanwhile, no significant changes were found for the positive relative accommodation (PRA), accommodative amplitude, accommodative response, negative relative vergence in all groups after watching the video. The comparisons between the three groups showed that, after watching the video, the participants in the two kinds of projection screen group (the metal and glass bead screen group) had more subjective visual fatigue than those in the flat screen group respectively (Z=-2.09, -2.21; all P<0.05), while there was no significant difference in subjective visual fatigue between the two projection screen groups (P>0.05). In addition, positive fusional vergence recovery point and break point decreased after watching the video in the metal screen and glass bead screen group, respectively (t=4.15, 2.07; all P<0.05). However, no such change was found in the flat screen group. Conclusions: Short-term and long-distance VDT operations have significant effects on visual fatigue, which may be due to the decreased positive convergence ability. VDT operations over projection screens may result in more visual fatigue than LED flat panel display, while the effect of different projection screen types have insignificant influences on visual fatigue. (Chin J Ophthalmol, 2019, 55:595-600).
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Affiliation(s)
- M Lan
- Department of Optometry and Visual Science, Sichuan University; Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu 610041, China
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Lang J, Lan M, Feng M, Xu P, Fu B, Duan Z, Zhang S, Qin Y, Peng X, Liu J, Li F, Lu S. Validation of the 8th Edition of the UICC/AJCC Staging System for Nasopharyngeal Carcinoma From non-Endemic Areas in the Era of Intensity-Modulated Radiation Therapy. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.890] [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: 11/25/2022]
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Lan M, Xu T, Gomez D, Jeter M, Nguyen Q, Deng W, Lin S, Komaki R, Liao Z. Association Between LGALS3 Gene Polymorphisms and Survival in Non–Small Cell Lung Cancer Patients Treated With Definitive Radiation Therapy. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.01.196] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Qian B, Zhao H, Xu B, Lan M. A thermal protective urethral heater applied to modulate the prostate cryoablation area. Cryo Letters 2017; 38:305-314. [PMID: 29734432] [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] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
BACKGROUND Urethral warmer and cryoheater are invented and applied in cryoablation to overcome urethral cryoinjury, but these devices cannot be fixed and precisely control the released heat which excessively reduces the effective ablation area. Current warmers enlarge the operation difficulty and decrease the precision in temperature control. OBJECTIVE A reformed catheter termed urethral heater aims to protect the urethra and simultaneously control the released heat so as to meet the aid of doctors' convenient operation in effective therapy, device fixation and precise heat controllability. MATERIALS AND METHODS In this paper, the temperature controller combined with temperature monitor was used to control the heating behavior of the urethral heater with the initial active temperature. The controllability and thermal protection of the urethral heater was simulated and tested, which compared with that of urethral warmer. RESULTS During the trials in vitro, the lowest temperature at the urethra surface is -3.7 degree C when one cryoprobe was introduced in the cryoablation for 15 min and -15.3 degree C with two cryoprobes. Above all, the effective cryoablation area increased with the decline of initial active temperatures. CONCLUSION The urethral heater is able to prevent the urethra from irreversible damage and modulate the ablation area. The delay of heat is a new way to decline the recurrence rate and facilitate the desire of aconuresis during the cryoablation.
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Affiliation(s)
- B Qian
- Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and MolecularEngineering, East China University of Science and Technology, Shanghai, China
| | - H Zhao
- Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and MolecularEngineering, East China University of Science and Technology, Shanghai, China
| | - B Xu
- AccuTarget MediPharma Co., Shanghai, China
| | - M Lan
- Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and MolecularEngineering, East China University of Science and Technology, Shanghai, China.
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Lan M, Wu S, Han F, Deng M, Chen C, Huang Y, Duan Z, Liao J, Tian L, Zheng L, Lu T. Triweekly versus weekly cisplatin concurrent with radiotherapy in locally advanced nasopharyngeal carcinoma. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw376.22] [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: 11/14/2022] Open
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Lan M, Chen C, Huang Y, Duan Z, Wu S, Han F, Liao J, Tian L, Zheng L, Xu T, Liao Z, Lu T. The Role of Concurrent Chemotherapy in Patients With Stage IVC Nasopharyngeal Carcinoma Treated With Palliative Chemotherapy Followed by Definitive Radiation Therapy to Primary Tumor. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.1536] [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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Hong L, Ning X, Shi Y, Shen H, Zhang Y, Lan M, Liang S, Wang J, Fan D. Reversal of multidrug resistance of gastric cancer cells by down-regulation of ZNRD1 with ZNRD1 siRNA. Br J Biomed Sci 2016; 61:206-10. [PMID: 15649014 DOI: 10.1080/09674845.2004.11732673] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [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: 10/21/2022]
Abstract
The over-expression of a new zinc ribbon (ZNRD1) gene has been shown previously to promote a multidrug-resistant phenotype in gastric cancer cells through the up-regulation of permeability-glycoprotein (P-gp). In the present study, siRNA eukaryotic expression vectors of ZNRD1 are constructed and transfected into SGC7901/VCR cells to examine whether or not down-regulation of ZNRD1 increases cell sensitivity towards chemotherapeutic drugs. After transfection, ZNRD1 expression decreased dramatically in ZNRD1 siRNA transfectants compared with that in parental cells and empty vector control cells. Down-regulation of ZNRD1 significantly enhanced the sensitivity of SGC7901/VCR cells to vincristine, adriamycin and etoposide, but not to 5-fluorouracil and cisplatin. Cell capacity to efflux adriamycin decreased markedly in ZNRD1 siRNA transfectants, and correlation between ZNRD1 down-regulation and increased multidrug resistance 1 (MDR1) gene transcriptional activity was observed. These results suggest that the ZNRD1 siRNA constructs down-regulate the expression of ZNRD1 effectively and reverse the resistant phenotype of gastric cancer cells. Furthermore, ZNRD1 might influence transcription of the MDR1 gene and thus play an important role in multidrug resistance in gastric carcinoma.
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Affiliation(s)
- L Hong
- Institute of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an, 710032, People's Republic of China
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Pacella-Ince L, Zander-Fox DL, Lan M. Mitochondrial SIRT3 and its target glutamate dehydrogenase are altered in follicular cells of women with reduced ovarian reserve or advanced maternal age. Hum Reprod 2014; 29:1490-9. [PMID: 24771001 DOI: 10.1093/humrep/deu071] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
STUDY QUESTION Is the activity of sirtuin 3 (SIRT3) altered in granulosa and cumulus cells from young women with reduced ovarian reserve or women of advanced maternal age? SUMMARY ANSWER SIRT3 mRNA and active protein in granulosa and cumulus cells were decreased in women with reduced ovarian reserve and advanced maternal age. WHAT IS KNOWN ALREADY Young women with reduced ovarian reserve or women of advanced maternal age have reduced oocyte viability, possibly due to altered granulosa and cumulus cell metabolism. The mitochondrial SIRT3 protein may be implicated in these processes as it is able to sense the metabolic state of the cell and alter mitochondrial protein function post-translationally. STUDY DESIGN, SIZE, DURATION This is a prospective cohort study, in which women (n = 72) undergoing routine IVF/ICSI were recruited and allocated to one of three cohorts based on age and ovarian reserve (as assessed by serum anti-Mullerian hormone level). Women were classified as young (≤35 years) or of advanced maternal age (≥40 years). PARTICIPANTS/MATERIALS, SETTING, METHODS Granulosa and cumulus cells were collected. SIRT3 mRNA and protein levels and protein activity was analysed in granulosa and cumulus cells via quantitative PCR, immunohistochemistry and western blotting, and deacetylation activity, respectively. Activity of the glutamate dehydrogenase (GDH) enzyme, a known target of SIRT3, was assessed, and acetylated proteins in mitochondria isolated from granulosa and cumulus cells were separated by immunoprecipitation and acetylation of GDH assessed by western blotting. Data for women with good prognosis (young women with normal ovarian reserve) were compared with those from young women with reduced ovarian reserve and those of advanced maternal age. MAIN RESULTS AND THE ROLE OF CHANCE SIRT3 mRNA and active protein were present in granulosa and cumulus cells and co-localized to the mitochondria. SIRT3 mRNA in granulosa cells was decreased in young women with reduced ovarian reserve and advanced maternal age versus young women with normal ovarian reserve (P < 0.05). SIRT3 mRNA in cumulus cells was decreased in women of advanced maternal age versus young women with normal ovarian reserve only (P < 0.05). Granulosa cell GDH activity was decreased in young women with reduced ovarian reserve and in women of advanced maternal age (P < 0.05), whereas cumulus cell GDH activity was reduced in the advanced maternal age group only (P < 0.05). The acetylation profile of GDH in mitochondria revealed increased acetylation of GDH in granulosa and cumulus cells from women of advanced maternal age (P < 0.05) while young women with reduced ovarian reserve had increased GDH acetylation in granulosa cells only (P < 0.05). LIMITATIONS, REASONS FOR CAUTION Although patients were allocated to groups based on maternal age and ovarian reserve and matched for BMI, other maternal factors may also alter the 'molecular health' of ovarian cells. WIDER IMPLICATIONS OF THE FINDINGS Our data suggest that SIRT3 post-translational modification of mitochondrial enzymes in human granulosa and cumulus cells may regulate GDH activity, thus altering the metabolic milieu surrounding the developing oocyte. Owing to the association between the decline in oocyte quality and pregnancy rates in women of advanced maternal age and the possible association with reduced ovarian reserve, knowledge of perturbed SIRT3 function in granulosa and cumulus cells may lead to novel therapies to improve mitochondrial metabolism in the oocyte and follicular cells in women undergoing IVF treatment. STUDY FUNDING/COMPETING INTEREST(S) No conflicts of interest to declare. Research was funded by an NHMRC project grant.
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Roa D, Acharya M, Bosch O, Christie L, Hamamura M, Lan M, Limoli C. Targeted Hippocampal Irradiation in a Small Rodent Using IMRS and RapidArc SRS: Preliminary Data. Int J Radiat Oncol Biol Phys 2011. [DOI: 10.1016/j.ijrobp.2011.06.1600] [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: 11/15/2022]
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Gong L, Zhang WD, Li YH, Liu XY, Yao L, Han XJ, Zhu SJ, Lan M, Zhang W. Clonal Status and Clinicopathological Features of Langerhans Cell Histiocytosis. J Int Med Res 2010; 38:1099-105. [PMID: 20819448 DOI: 10.1177/147323001003800338] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Some studies have demonstrated that Langerhans cell histiocytosis (LCH) is a neoplastic hyperplasia of Langerhans cells, however some researchers consider that clonality should be assessed in more patients with LCH, both at disease presentation and during the disease course. Monoclonality is a major characteristic of most tumours, whereas normal tissue and reactive hyperplasia are polyclonal. To elucidate the nature of Langerhans cells further, the present study investigated the clinicopathological features and clonality of three cases of LCH in female patients using laser microdissection and a clonality assay, based on X-chromosomal inactivation mosaicism in somatic tissues and polymorphism of the androgen receptor gene. The results indicated that LCH was composed of Langerhans cells with a characteristic morphological appearance, eosinophils, giant cells, neutrophils and foamy cells. Immunohistochemically, the Langerhans cells were positive for CD1a, S-100 protein and vimentin. The clonality assay demonstrated that the Langerhans cells formed a monoclonal population, showing that LCH is neoplastic. We conclude that LCH is characterized by clonal proliferation, although additional studies with larger sample sizes are required to prove this conclusively.
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Affiliation(s)
- L Gong
- Department of Pathology, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - W-D Zhang
- Department of Rehabilitation & Physiotherapy, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Y-H Li
- Department of Pathology, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - X-Y Liu
- Department of Pathology, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - L Yao
- Department of Pathology, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - X-J Han
- Department of Pathology, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - S-J Zhu
- Department of Pathology, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - M Lan
- Department of Pathology, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - W Zhang
- Department of Pathology, Tangdu Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
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Noshadi H, Amini N, Woodbridge J, Xu W, Lan M, Hagopian H, Terrafranca N, Sarrafzadeh M. 098 LIGHTWEIGHT CONTEXT-AWARE SMART INSOLE FOR GAIT ANALYSIS, RESEARCH AND REHABILITATION. Parkinsonism Relat Disord 2010. [DOI: 10.1016/s1353-8020(10)70099-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Liang J, Pan YL, Ning XX, Sun LJ, Lan M, Hong L, Du JP, Liu N, Liu CJ, Qiao TD, Fan DM. Overexpression of PrPC and its antiapoptosis function in gastric cancer. Tumour Biol 2006; 27:84-91. [PMID: 16582585 DOI: 10.1159/000092488] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2005] [Accepted: 05/24/2005] [Indexed: 12/30/2022] Open
Abstract
Cellular prion protein (PrP(C)), a glycosylphosphatidylinositol-anchored membrane protein, was found in our lab to be widely expressed in gastric cancer cell lines. In order to evaluate its biological significance in human gastric cancer, we investigated its expression in a large series of gastric tissue samples (n = 124) by immuno histochemical staining with the monoclonal antibody 3F4. Compared with normal tissues, gastric adenocarcinoma showed increased PrP(C) expression, correlated with the histopathological differentiation (according to the WHO and Lauren classifications) and tumor progression (as documented by pTNM staging). To better understand the underlying mechanism, we introduced the PrP(C) and two pairs of RNAi into the poorly differentiated gastric cancer cell line AGS and found that PrP(C) suppressed ROS and slowed down apoptosis in transfected cells. Further study proved that the apoptosis-related protein Bcl-2 was upregulated whereas p53 and Bax were downregulated in the PrP(C)-transfected cells. A reverse effect was observed in PrP(C) siRNA-transfected cells. These results strongly suggested that PrP(C) might play a role as an effective antiapoptotic protein through Bcl-2-dependent apoptotic pathways in gastric cancer cells. Further study into the mechanism of these relationships might enrich the knowledge of PrP, better our understanding of the nature of gastric carcinoma, and further develop possible strategies to block or reverse the development of gastric carcinoma.
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Affiliation(s)
- J Liang
- State Key Laboratory of Cancer Biology and Institute of Digestive Diseases, Xijing Hospital, Fourth Military Medical University, Xi'an, China
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Pedersen N, Pedersen M, Lan M, Poulsen T, Poulsen H. P-970 Cancer specific promoters for gene therapy of small cell lungcancer. Lung Cancer 2005. [DOI: 10.1016/s0169-5002(05)81463-1] [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: 10/25/2022]
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22
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Abstract
We characterised a consecutive cohort of 132 youth onset diabetic individuals (age at onset<30 years, mean duration of disease 5.5+/-6.0 years) from North India, by serological determination of the determination of the islet cell autoantibodies, GAD(65) and IA2, and clinically for coexisting autoimmune thyroid disease, malnutrition and pancreatic calcification. Five types of diabetes were delineated: Type 1 (37%), ketosis resistant (32%), Type 2 (13%), fibrocalculous pancreatopathy (11%) and autoimmune polyglandular syndrome (7%). C-peptide response to glucagon was assessed in a representative subset of 50 patients with Type 1, ketosis resistant, and autoimmune polyglandular syndrome. A total of 22.4% of Type 1 and 30% of autoimmune polyglandular syndrome subjects showed both GAD(65) plus IA-2 autoantibody positivity, significantly more than the 4.7% positivity shown by the ketosis resistant type. However, GAD(65) antibody positivity alone was seen in 38% of ketosis resistant subjects which was significantly more than the 14.2 and 10% positivity seen in Type 1 and autoimmune polyglandular groups, respectively. The fibrocalculous pancreatopathy group showed GAD(65) plus IA-2 autoantibody positivity in 14.2% and GAD(65) autoantibody alone positivity in 7.1%. 26 and 60%, respectively, of the Type 1 and autoimmune polyglandular syndrome groups had thyroid microsomal autoantibody positivity. Type 1 showed significantly less C-peptide response to glucagon when compared to the ketosis resistant and autoimmune polyglandular syndrome groups. The controls and Type 2 diabetic individuals tested negative for islet cell autoimmunity markers. These findings demonstrate a role of islet cell autoimmunity in the pathogenesis of four out of the five clinical types of youth onset diabetes seen in North India.
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Affiliation(s)
- R Goswami
- Department of Endocrinology and Metabolism, All India Institute of Medical Science, 110029, New Delhi, India
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Wang X, Wu K, Zhang Z, Lan M, Jin J, Fan D. [The effect of calponin and caldesmon in regulation of the gastrointestinal motility during pathophysiological adaptation]. Zhonghua Nei Ke Za Zhi 2001; 40:459-62. [PMID: 11798615] [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] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To investigate the expression of calponin (CaP) and caldesmon (CaD) in the gastrointestinal tract and their effect in regulating gastrointestinal motility during physiological and pathological adaptation. METHODS Models of chronic gastrointestinal motility hyperfunction in mice were induced by intragastric administration of senna extraction and models of chronic gastrointestinal motility hypofunction in rats were established with carbon tetrachloride induced cirrhosis, CaP and CaD were detected in the gastrointestinal tract of different model groups using SDS-PAGE and Western blot. The color development of Western blots was scanned using densitometric scanning. The relative contents of gastrointestinal CaP and CaD were compared with control animals with different state of gastrointestinal motility. RESULTS Animal models of abnormal gastrointestinal motility were established in mice and rats. Densitometric quantification of CaP and CaD blots by CP1 and C98 mAbs showed that normal animal colon contained higher amounts of h1-CaP and CaD. In normal mice and rats, the content of CaP and CaD was successively in this order :colon > stomach > small intestine. The content was reduced in mice of chronic gastrointestinal motility hyperfunction, but the expression of CaP and CaD was promoted in rats with cirrhosis and declined to normal level after treatment with L-NAME. CONCLUSION There is close relation between expression of CaP and CaD and state of gastrointestinal motility. CaP and CaD may inhibit gastrointestinal motility. These suggest that CaP and CaD may play a role in the regulation of gastrointestinal motility during physiological and pathological adaptation.
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Affiliation(s)
- X Wang
- Institute of Gastroenterology, The Fourth Military Medical University, Xi'an 710033, China
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Bibb JA, Nishi A, O'Callaghan JP, Ule J, Lan M, Snyder GL, Horiuchi A, Saito T, Hisanaga S, Czernik AJ, Nairn AC, Greengard P. Phosphorylation of protein phosphatase inhibitor-1 by Cdk5. J Biol Chem 2001; 276:14490-7. [PMID: 11278334 DOI: 10.1074/jbc.m007197200] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Protein phosphatase inhibitor-1 is a prototypical mediator of cross-talk between protein kinases and protein phosphatases. Activation of cAMP-dependent protein kinase results in phosphorylation of inhibitor-1 at Thr-35, converting it into a potent inhibitor of protein phosphatase-1. Here we report that inhibitor-1 is phosphorylated in vitro at Ser-67 by the proline-directed kinases, Cdk1, Cdk5, and mitogen-activated protein kinase. By using phosphorylation state-specific antibodies and selective protein kinase inhibitors, Cdk5 was found to be the only kinase that phosphorylates inhibitor-1 at Ser-67 in intact striatal brain tissue. In vitro and in vivo studies indicated that phospho-Ser-67 inhibitor-1 was dephosphorylated by protein phosphatases-2A and -2B. The state of phosphorylation of inhibitor-1 at Ser-67 was dynamically regulated in striatal tissue by glutamate-dependent regulation of N-methyl-d-aspartic acid-type channels. Phosphorylation of Ser-67 did not convert inhibitor-1 into an inhibitor of protein phosphatase-1. However, inhibitor-1 phosphorylated at Ser-67 was a less efficient substrate for cAMP-dependent protein kinase. These results demonstrate regulation of a Cdk5-dependent phosphorylation site in inhibitor-1 and suggest a role for this site in modulating the amplitude of signal transduction events that involve cAMP-dependent protein kinase activation.
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Affiliation(s)
- J A Bibb
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, New York 10021-6399, USA.
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25
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Maclaren N, Lan M, Coutant R, Schatz D, Silverstein J, Muir A, Clare-Salzer M, She JX, Malone J, Crockett S, Schwartz S, Quattrin T, DeSilva M, Vander Vegt P, Notkins A, Krischer J. Only multiple autoantibodies to islet cells (ICA), insulin, GAD65, IA-2 and IA-2beta predict immune-mediated (Type 1) diabetes in relatives. J Autoimmun 1999; 12:279-87. [PMID: 10330299 DOI: 10.1006/jaut.1999.0281] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We report here our prospective study of 15,224 non-diabetic, first-degree relatives of probands with immune-mediated (type 1) diabetes (IMD), of which 135 were found to eventually develop diabetes. We determined islet cell, insulin, GAD65, insulinoma-associated antigen-2 and 2beta autoantibodies (ICA, IAA, GAD65A, IA-2A and IA-2betaA), on the first available serum samples. The latter three autoantibodies were however assayed on subsets of the relatives with and without ICA, IAA and/or GAD65A, plus most of the relatives who developed diabetes. Of the relatives who progressed to diabetes, 94% had at least one of these autoantibodies on the first screening, while ICA proved to be the most sensitive single marker (sensitivity 74%). Risk of diabetes was however negligible when ICA was found in the absence of the others (5-year risk=5.3%), but increased dramatically whenever two or more autoantibodies were present (5-year risk=28.2% and 66.2%, respectively). The most predictive combination of markers was ICA plus IA-2A and/or IA-2beta A. Loss of first phase insulin release to IVGTT also occurred only in those ICA-positive relatives who had one or more of the other autoantibodies. The data suggests that significant beta-cell damage is seen only when the underlying autoimmunity has spread to multiple antigenic islet cell determinants. Combinations of the autoantibodies occurred most often in relatives with the highest risk HLA-DR/DQ phenotypes. These data document that only relatives positive for at least two or more of these five autoantibodies are at significant risk of diabetes themselves. Intervention trials for the prevention of type 1 diabetes could be designed based on testing for these autoantibodies alone, without the need for HLA typing and IVGTT testing.
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Affiliation(s)
- N Maclaren
- Departments of Pediatrics and Biometry and Genetics, Louisiana State University Medical School at the Research Institute for Children, New Orleans, LA, USA
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Abstract
Insulin-dependent diabetes mellitus causes microangiopathic changes in many tissues, including skin and muscle. It is not known if such changes are detrimental to free flap transfer, particularly after extended ischemia. To address this issue, we used an experimental design by using a syngeneic rat strain (Lewis) for free groin flap and muscle flap transplantations from streptozotocin-induced diabetic rats (2 month's duration of symptoms) to normal rats. Flaps from age-matched normal donors were transplanted to normal recipients for control comparisons. Groin flaps were stored ischemically for 12 or 18 hours at room temperature, or for 48 hours in the cold (4 degrees C) before transplantation. Flap survival and vascular patency were assessed at 7 days. Cutaneous maximus muscle flaps were transplanted to the groins of recipients after 6 hours of room temperature ischemia. Vascular patency, muscle viability, flap weight change (edema), and dehydrogenase activity were assessed after 2 days of reperfusion. Seventy percent, 67%, and 73% of diabetic groin flaps survived after 12, 18, or 48 (cold) hours of ischemia, respectively, in comparison with 90%, 73%, and 87% of normal flaps undergoing the same respective ischemia periods. The differences were not significant, even when the data were pooled (p greater than 0.1). Muscle flaps also showed no significant differences for the parameters studied. These results support the use of microvascular reconstructive surgery in diabetic patients, suggesting that moderate ischemic challenges do not compromise free flap transfer or extremity replantation.
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Affiliation(s)
- B C Cooley
- Department of Orthopaedic Surgery, Medical College of Wisconsin, Milwaukee 53226
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Lan M, Li XL, Cooley BC, Gould JS. Microvascular salvage procedures with adjuvant antithrombotic therapy for restitution of patency in a rat model. J Reconstr Microsurg 1992; 8:201-5; discussion 207-8. [PMID: 1378494 DOI: 10.1055/s-2007-1006701] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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: 12/26/2022]
Abstract
Thrombosis following microvascular anastomosis requires further surgical intervention, involving anastomotic resection and reanastomosis or interpositional vein grafting. This study was undertaken to investigate different methods of salvaging thrombosed vessels, using a rat-vein model of error-induced thrombosis. Vessels were reconstructed 4 hr after the onset of thrombosis, using one of three methods: Group 1--removal of the erroneously placed stitch; Group 2--anastomotic resection and re-anastomosis; and Group 3--resection and replacement with a vein graft. Adjuvant antithrombotic therapy was simultaneously evaluated, assessing the influence of systemic Iloprost or heparin. Patency rates at one day postoperatively were 0 percent, 12.5 percent and 37.5 percent for Groups 1, 2, and 3, respectively. Following Iloprost infusion, these rates increased to 25 percent, 25 percent, and 56.3 percent, respectively and, following heparin administration, to 50 percent, 68.8 percent, and 81.8 percent, respectively. Significant increases were found for vein grafting (Group 3), and for the heparin-treated subgroups using all three methods. Effective levels of both Iloprost and heparin were confirmed by increases noted in rat-tail bleeding times. Significant rates of recanalization by three days following one-day occlusion were found in Groups 1 and 2. These results support the application of vein-graft replacement for thrombosed veins, concurrently with systemic heparinization. This study further confirms the high rate of recanalization seen in thrombosed rat femoral veins.
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Affiliation(s)
- M Lan
- Department of Orthopaedic Surgery, Medical College of Wisconsin, Milwaukee 53226
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Wu S, Li L, Lang X, Zhao S, Qi H, Liu C, Lan M, Zhang J. [Effects of semen Ziziphis Spinosae oil and Ziziphis Spinosae extract on the decrease of serum lipoprotein and inhibiton of platelet aggregation]. Zhongguo Zhong Yao Za Zhi 1991; 16:435-7, 449. [PMID: 1910512] [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] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Our experiments have shown that oral administration of Semen Ziziphis Spinosae oil(SZSO) or Ziziphis Spinosae extract (ZSE) given to quails for 53 days can significantly reduce their TC, LDL and TG and markedly subdue the fatty degeneration in their livers. Also, SZSO pressed into the stomach of rats for five days can conspicuously inhibit their platelet aggregation, while ZSE cannot.
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Affiliation(s)
- S Wu
- Hebei Provincial Academy of Medical Sciences, Shijiazhuang
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29
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Abstract
The rat femoral vein has become a standard model for microvascular anastomosis practice as well as for research investigations into various manipulative influences upon venous patency. Although vein grafts to the rat artery are the focus of many experimental studies, few reports have investigated vein-to-vein grafts. This study examines the short-term patency (1-3 days) of vein grafts interpositioned to the rat femoral vein. Several factors are studied for their ability to alter the patency rate. The results indicate that patency is difficult to achieve following the creation of a second serial anastomosis (construction of a vein-to-vein graft). Systemic heparin consistently improves patency rates, and trends toward increased patency are seen for reduction in longitudinal tension of the repaired vessel. It is also implied that a deeper understanding of venous hemodynamics and thrombotic events may lead to improved methodologies in the clinical applications of microvenous repairs. These results indicate that rat vein-to-vein grafts may provide a challenging microvascular training model, while introducing the novice microsurgeon to some of the complicating factors encountered with microvascular grafting.
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Affiliation(s)
- B C Cooley
- Department of Orthopaedic Surgery, Medical College of Wisconsin, Milwaukee 53226
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30
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Wallach JD, Lan M, Yu WH, Gu BQ, Yu FT, Goddard RF. Common denominators in the etiology and pathology of visceral lesions of cystic fibrosis and Keshan disease. Biol Trace Elem Res 1990; 24:189-205. [PMID: 1702672 DOI: 10.1007/bf02917207] [Citation(s) in RCA: 4] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The common denominator of a unique disseminated multi-focal miliary myocardial hyaline necrosis and fibrosis in Keshan disease (KSD) and cystic fibrosis (CF) and a commonality of the affected age groups of fetuses and preschool children led to the review of existing KSD autopsy material to search for pancreatic and hepatic lesions considered pathognomonic for CF. Pancreatic lesions considered pathognomonic for CF were found in 595, or 35% of 1700 documented cases of KSD. The pancreatic lesions were limited to tissues of fetuses and preschool children. Adults dying of KSD had diagnostic lesions limited to the cardiovascular system, liver, and skeletal muscle. Varying degrees of focal biliary cirrhosis were identified in 850, or 50% of the KSD autopsies, and 85, or 5% developed severe lobular cirrhosis. The common denominator in CF and KSD appears to be a primary or induced secondary selenium deficiency in age-susceptible humans, prenatally at or around 22 wk of fetal life, during early postnatal life, or during the rapid-growth preschool years. The basic difference between the natural history of CF and KSD is that the selenium deficiency is totally environmental in KSD and appears to be the result of a maternal malabsorptive syndrome or an abnormality of selenium transfer in CF.
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Affiliation(s)
- J D Wallach
- Department of Pathology, Prince Charles Medical University, Granada/Baja, Mexico
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Abstract
Technological advances have made CO2 laser-assisted microvascular anastomoses (LAMA) feasible. This study seeks to compare results of LAMA versus CSMA (conventional suture microsurgical anastomosis) in traumatized vessels. Using a rat model, femoral arteries and veins were either crushed and transected or divided by avulsion and then repaired by either LAMA or CSMA. LAMA resulted in higher patency rates than CSMA at early postoperative observation periods. With time, the patency rates improved in both groups and, by the end of the study, the patency rates were equivalent. These findings indicate that the laser technique may be a better option when working with traumatized vessels because of the critical nature of early patency rates. The improved results may be due to a reduction of suture material at the anastomotic site when using the laser technique. Some physiologic aspects of vessel thrombosis, recanalization, and the role of collateral circulation are discussed.
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Affiliation(s)
- A Ruiz-Razura
- Division of Plastic Surgery and Microsurgery, St. Joseph Hospital, Houston TX 77002
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Abstract
A simple method of performing the laser-assisted end-to-side microvascular anastomosis was devised. This technique was tested on 150 Sprague-Dawley rats in two separate series of experiments. In the first, end-to-side anastomoses were performed on the iliac artery under the normal tension due to the elastic recoil of severed vessels. Four stay sutures were placed 90 degrees apart, and the intervals were "spot welded" with a low-wattage CO2 microsurgical laser unit. The patency rate (96 percent) was equivalent to that found in a control group utilizing the conventional all-suture method (92 percent), but there was a significantly higher aneurysm rate (44 versus 11 percent). In a second model, an arterial bypass with very low anastomotic tension was performed around an obstruction created in the carotid artery. This model resulted in turbulent flow but low anastomotic tension. Here the laser-anastomosis patency rate was 98 percent, versus 42 percent for the conventional all-suture method. The placement of fewer sutures in association with turbulent flow in this model may account for the improved patency rate. The avoidance of excessive tension at the anastomotic site reduced the incidence of aneurysms to a negligible level.
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Affiliation(s)
- A Ruiz-Razura
- Department of Microsurgery, St. Joseph Hospital, Houston, Texas
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Abstract
Iliac artery end-to-end anastomoses were performed in 42 Sprague-Dawley rats, divided into seven groups, to determine the welding effects of CO2 laser radiation in microvascular anastomoses. Conventional suture techniques were performed on right iliac arteries, and left iliac arteries were anastomosed with a laser-assisted technique. Bursting strength and diameters of the anastomotic sites were measured at different intervals (from one day to five weeks) post surgery. The anastomotic patency rate was 100 percent in both groups, and the aneurysm rate was only 2 percent in the laser group. Bursting strength was low at one and three days post surgery in both groups; then, it increased gradually until both groups could withstand higher than physiologic pressures. Results of high patency rates, low aneurysm formation, and the ability to withstand pressures higher than physiologic, suggest that the laser-assisted anastomotic technique can play an important role in microvascular surgery.
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Affiliation(s)
- A Ruiz-Razura
- Department of Microsurgery, St. Joseph Hospital, Houston, Texas
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