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Li WJ, Diao DC, Lin JX, Wang JH, Liao WL, Tang X, Xie JX, Ao L, Zhang XY, Yi XJ, Feng XC, Li HM, Lu XQ. [Feasibility of a three-sided encapsulation procedure based on fascia anatomy in laparoscopic lateral lymph node dissection for middle and low rectal cancer]. Zhonghua Wei Chang Wai Ke Za Zhi 2023; 26:968-976. [PMID: 37849268 DOI: 10.3760/cma.j.cn441530-20230525-00181] [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] [Subscribe] [Scholar Register] [Indexed: 10/19/2023]
Abstract
Objective: To explore the feasibility and value of performing a three-sided encapsulation procedure based on fascia anatomy in laparoscopic lateral lymph node dissection (LLND) for middle and low rectal cancer. Methods: This was a retrospective review. The study cohort comprised patients who met the diagnostic criteria for rectal cancer according to the Chinese Guidelines for the Diagnosis and Treatment of Colorectal Cancer, had a short lymph node diameter of >5 mm on the lateral side within the 15 days before surgery, were evaluated as feasible candidates for laparoscopic total mesorectal excision+LLND surgery, had been diagnosed with low or intermediate level rectal cancer, and whose tumor was less than 8 cm away from the anal verge according to pathological examination of the operative specimen. Patients with a history of other malignant tumors of the abdomen or with incomplete follow-up data were excluded. Forty-two patients with middle and low rectal cancer who had undergone lateral lymph node dissection in diagnosis and treatment center of Gastrointestinal Cancer of Guangdong Hospital of Chinese Medicine from Jan.2018 to Dec.2022 were enrolled. There were 24 men (57.1%) and 18 women (42.9%) aged 58.4±11.8 years and the median BMI was 22.5 (19.3-24.1) kg/m2. The main point of the three-sided encapsulation procedure is to expand the external side medial to the external iliac artery and vein, narrowing the range of exterior side dissection. The anterior-medial side is designed to expand the vesical fascia to define the range of anterior-medial side extension. The internal side is fully extended to the ureterohypogastric nerve fascia; the distal point of the caudal extension reaches the level of the Alcock canal and the bottom reaches the piriformis, enabling dissection of the obturator nerve and No.283 lymph nodes. No.263D lymph nodes are dissected by exposing the internal iliac artery and its branches, dissecting the group No.263P lymph nodes, and severing the inferior vesical artery. Finally, the lateral lymphatic tissue is completely resected. Relevant variables were recorded, including the number of lateral lymph nodes detected, the rate of lymph node metastasis, operation duration, intraoperative blood loss, postoperative complications, postoperative hospital stay, and 3-year overall survival rate. Results: Laparoscopic surgery was successfully completed in all patients with no conversions to open surgery and no intraoperative complications. Twenty-seven (64.3%) of the study patients underwent left-sided LLND, 10 (23.8%) right-sided LLND, and five (11.9%) bilateral LLND, with lymph nodes cleared on both sides. All patients' lymph nodes were examined pathologically. A median of 17.0 (11.7, 26.0) lymph nodes was detected, the median of lateral lymph nodes being 5.0 (2.0, 10.2). The median operation time was 254.5 (199.0, 325.2) minutes. The median intra-operative blood loss was 50.0 (30.0, 100.0) mL. All patients were diagnosed with adenocarcinoma by pathological examination of the operative specimen. Two patients developed postoperative intestinal obstruction, one lymphatic leakage, and one a perineal incision infection. There were no cases of anastomotic leakage. The median postoperative hospital stay was 6.0 (5.0, 7.0) days and the median follow-up time 23.5 (9.0, 36.7) months. During follow-up, three patients (7.1%) died of tumor recurrence and metastasis. Two (4.8%) experienced mild urinary dysfunction, and one (2.4%) had moderate postoperative erectile dysfunction. One patient (2.4%) was found to have prostate and lung metastases 3 month after surgery. The 3-year overall survival rate was 74.4%. Conclusions: Three sided encapsulation is a safe and feasible procedure for LLND, achieving accurate and complete clearance of lateral lymphatic tissue.
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Affiliation(s)
- W J Li
- The Second Clinical Medical School, Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - D C Diao
- Department of Gastrointestinal Surgery, Guangdong Provincial Hospital of Traditional Chinese Medicine, Guangzhou 510120, China
| | - J X Lin
- The Second Clinical Medical School, Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - J H Wang
- The Second Clinical Medical School, Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - W L Liao
- The Second Clinical Medical School, Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - X Tang
- The Second Clinical Medical School, Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - J X Xie
- The Second Clinical Medical School, Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - L Ao
- Department of Gastrointestinal Surgery, Guangdong Provincial Hospital of Traditional Chinese Medicine, Guangzhou 510120, China
| | - X Y Zhang
- The Second Clinical Medical School, Guangzhou University of Chinese Medicine, Guangzhou 510405, China
| | - X J Yi
- Department of Gastrointestinal Surgery, Guangdong Provincial Hospital of Traditional Chinese Medicine, Guangzhou 510120, China
| | - X C Feng
- Department of Gastrointestinal Surgery, Guangdong Provincial Hospital of Traditional Chinese Medicine, Guangzhou 510120, China
| | - H M Li
- Department of Gastrointestinal Surgery, Guangdong Provincial Hospital of Traditional Chinese Medicine, Guangzhou 510120, China
| | - X Q Lu
- Department of Gastrointestinal Surgery, Guangdong Provincial Hospital of Traditional Chinese Medicine, Guangzhou 510120, China
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Fu CP, Cai XY, Chen SL, Yu HW, Fang Y, Feng XC, Zhang LM, Li CY. Hyaluronic Acid-Based Nanocarriers for Anticancer Drug Delivery. Polymers (Basel) 2023; 15:polym15102317. [PMID: 37242892 DOI: 10.3390/polym15102317] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [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: 04/11/2023] [Revised: 05/06/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
Hyaluronic acid (HA), a main component of the extracellular matrix, is widely utilized to deliver anticancer drugs due to its biocompatibility, biodegradability, non-toxicity, non-immunogenicity and numerous modification sites, such as carboxyl and hydroxyl groups. Moreover, HA serves as a natural ligand for tumor-targeted drug delivery systems, as it contains the endocytic HA receptor, CD44, which is overexpressed in many cancer cells. Therefore, HA-based nanocarriers have been developed to improve drug delivery efficiency and distinguish between healthy and cancerous tissues, resulting in reduced residual toxicity and off-target accumulation. This article comprehensively reviews the fabrication of anticancer drug nanocarriers based on HA in the context of prodrugs, organic carrier materials (micelles, liposomes, nanoparticles, microbubbles and hydrogels) and inorganic composite nanocarriers (gold nanoparticles, quantum dots, carbon nanotubes and silicon dioxide). Additionally, the progress achieved in the design and optimization of these nanocarriers and their effects on cancer therapy are discussed. Finally, the review provides a summary of the perspectives, the lessons learned so far and the outlook towards further developments in this field.
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Affiliation(s)
- Chao-Ping Fu
- Institute of Biomaterials and Tissue Engineering & Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen 361021, China
- College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, China
- State Key Laboratory of Molecular Engineering of Polymers (Fudan University), Shanghai 200438, China
| | - Xing-Yu Cai
- Institute of Biomaterials and Tissue Engineering & Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen 361021, China
- College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, China
| | - Si-Lin Chen
- Institute of Biomaterials and Tissue Engineering & Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen 361021, China
- College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, China
| | - Hong-Wei Yu
- Institute of Biomaterials and Tissue Engineering & Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen 361021, China
- College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, China
| | - Ying Fang
- College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, China
| | - Xiao-Chen Feng
- College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, China
| | - Li-Ming Zhang
- School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Chang-Yong Li
- Institute of Biomaterials and Tissue Engineering & Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen 361021, China
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Feng XC, Liu FC, Chen WY, Du J, Liu H. Lipid metabolism of hepatocellular carcinoma impacts targeted therapy and immunotherapy. World J Gastrointest Oncol 2023; 15:617-631. [PMID: 37123054 PMCID: PMC10134209 DOI: 10.4251/wjgo.v15.i4.617] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 01/09/2023] [Accepted: 03/08/2023] [Indexed: 04/12/2023] Open
Abstract
Hepatocellular carcinoma (HCC) is a common malignant tumor that affecting many people's lives globally. The common risk factors for HCC include being overweight and obese. The liver is the center of lipid metabolism, synthesizing most cholesterol and fatty acids. Abnormal lipid metabolism is a significant feature of metabolic reprogramming in HCC and affects the prognosis of HCC patients by regulating inflammatory responses and changing the immune microenvironment. Targeted therapy and immunotherapy are being explored as the primary treatment strategies for HCC patients with unresectable tumors. Here, we detail the specific changes of lipid metabolism in HCC and its impact on both these therapies for HCC. HCC treatment strategies aimed at targeting lipid metabolism and how to integrate them with targeted therapy or immunotherapy rationally are also presented.
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Affiliation(s)
- Xiao-Chen Feng
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai 200082, China
| | - Fu-Chen Liu
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai 200082, China
| | - Wu-Yu Chen
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai 200082, China
| | - Jin Du
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai 200082, China
| | - Hui Liu
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai 200082, China
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Wang L, Zhu QX, Zhong MH, Zhou RZ, Liu XQ, Tang NS, Feng XC, Gao CF. Effects of corticospinal tract integrity on upper limb motor function recovery in stroke patients treated with repetitive transcranial magnetic stimulation. J Integr Neurosci 2022; 21:50. [PMID: 35364638 DOI: 10.31083/j.jin2102050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 12/16/2021] [Accepted: 12/24/2021] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND The bimodal balance-recovery model predicts that corticospinal tract (CST) integrity in the affected hemisphere influences the partterns of brain recovery after stroke. Repetitive transcranial magnetic stimulation (rTMS) has been used to promote functional recovery of stroke patients by modulating motor cortical excitability and inducing reorganization of neural networks. This study aimed to explore how to optimize the efficiency of repetitive transcranial magnetic stimulation to promote upper limb functional recovery after stroke according to bimodal balance-recovery model. METHODS 60 patients who met the inclusion criteria were enrolled to high CST integrity group (n = 30) or low CST integrity group (n = 30), and further assigned randomly to receive high-frequency rTMS (HF-rTMS), low-frequency rTMS (LF-rTMS) or sham rTMS in addition to routine rehabilitation, with 10 patients in each group. Outcome measures included Fugl-Meyer scale for upper extremity (FMA-UE), Wolf Motor Function (WMFT) scale and Modified Barthel Index (MBI) scale which were evaluated at baseline and after 21 days of treatment. RESULTS For patients with high CST integrity, the LF group achieved higher FMA-UE, WMFT and MBI scores improvements after treatment when compared to the HF group and sham group. For patients with low CST integrity, after 21 days treatment, only the HF group showed significant improvements in FMA-UE and WMFT scores. For MBI assessment, the HF group revealed significantly better improvements than the LF group and sham group. CONCLUSIONS For stroke patients with high CST integrity, low-frequency rTMS is superior to high-frequency rTMS in promoting upper limb motor function recovery. However, only high-frequency rTMS can improve upper limb motor function of stroke patients with low CST integrity.
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Affiliation(s)
- Lu Wang
- Department of Rehabilitation Medicine, The Affiliated Hospital of Qingdao University, 266003 Qingdao, Shandong, China
| | - Qi-Xiu Zhu
- Department of Rehabilitation Medicine, The Affiliated Hospital of Qingdao University, 266003 Qingdao, Shandong, China
| | - Ming-Hua Zhong
- Department of Rehabilitation Medicine, Qingdao Eighth People's Hospital, 266121 Qingdao, Shandong, China
| | - Rui-Zhi Zhou
- Department of Radiology, The Affiliated Hospital of Qingdao University, 266003 Qingdao, Shandong, China
| | - Xi-Qin Liu
- Department of Rehabilitation Medicine, The Affiliated Hospital of Qingdao University, 266003 Qingdao, Shandong, China
| | - Nai-Su Tang
- Department of Rehabilitation Medicine, The Affiliated Hospital of Qingdao University, 266003 Qingdao, Shandong, China
| | - Xiao-Chen Feng
- Department of Rehabilitation Medicine, The Affiliated Hospital of Qingdao University, 266003 Qingdao, Shandong, China
| | - Cheng-Fei Gao
- Department of Rehabilitation Medicine, The Affiliated Hospital of Qingdao University, 266003 Qingdao, Shandong, China.,Department of Biomedical Engineering, The Hong Kong Polytechnic University, 999077 Hong Kong, China
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Yang LF, Liu X, Lv LL, Ma ZM, Feng XC, Ma TH. Dracorhodin perchlorate inhibits biofilm formation and virulence factors of Candida albicans. J Mycol Med 2018; 28:36-44. [PMID: 29477784 DOI: 10.1016/j.mycmed.2017.12.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2017] [Revised: 12/22/2017] [Accepted: 12/27/2017] [Indexed: 12/14/2022]
Abstract
OBJECTIVE The aim of this study was to investigate the antifungal activity of dracorhodin perchlorate (DP) against planktonic growth and virulence factors of Candida albicans. METHODS Microdilution method based on CLSI-M27-A3 was used to test the antifungal susceptibility of DP. The activity of DP against biofilm formation and development of C. albicans was quantified by XTT assay and visualized by confocal laser scanning microscope. The effect of DP on the morphological transition of C. albicans induced by four kinds of hyphal-inducing media at 37°C for 4hours was observed under microscope. The rescue experiment by adding exogenous cAMP analog was performed to investigate the involvement of cAMP in the yeast to hyphal transition and biofilm formation of C. albicans. Egg yolk emulsion agar was used to determine the inhibition of DP on the phospholipase production of C. albicans. Human JEG-3 and HUVEC cell lines, as well as the nematode Caenorhabditis elegans was used to assess the toxicity of DP. RESULTS The minimum inhibitory concentration (MIC) of DP is 64μM while the antifungal activity was fungistatic. As low as a concentration at 16μM, DP could inhibit the yeast to hyphal transition in liquid RPMI-1640, Spider, GlcNAc and 10% FBS-containing Sabouroud Dextrose medium, as well as on the solid spider agar. Exogenous cAMP analog could rescue part of biofilm viability of C. albicans. DP could inhibit the production of phospholipase. The toxicity of DP against human cells and C. elegans is low. CONCLUSION DP could inhibit the planktonic growth and virulent factors in multiple stages, such as yeast to hyphal transition, adhesion, biofilm formation and production of phospholipase of C. albicans.
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Affiliation(s)
- L F Yang
- Jilin Provincial Key Laboratory on Molecular and Chemical Genetics, The Second Hospital of Jilin University, Changchun 130024, China.
| | - X Liu
- Eye Center, The Second Hospital of Jilin University, Changchun 130024, China.
| | - L L Lv
- Department of Oncology and Hematology, The Second Hospital of Jilin University, Changchun 130041, China.
| | - Z M Ma
- Department of Gastrointestinal Nutrition and Hernia Surgery, The Second Hospital of Jilin University Changchun 130041, China.
| | - X C Feng
- College of Life Science, Northeast Normal University, Changchun 130041, China.
| | - T H Ma
- Jilin Provincial Key Laboratory on Molecular and Chemical Genetics, The Second Hospital of Jilin University, Changchun 130024, China.
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Zhao WW, Yang YH, Lu B, Feng XC, He M, Yang ZH, Wen J, Zhang ZY, Yang Z, Li Q, Ye Z, Gong W, Hu RM. Serum high-density lipoprotein cholesterol and progression to arterial stiffness in middle-aged and elderly Chinese. Nutr Metab Cardiovasc Dis 2013; 23:973-979. [PMID: 23010609 DOI: 10.1016/j.numecd.2012.08.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2012] [Revised: 07/19/2012] [Accepted: 08/06/2012] [Indexed: 02/02/2023]
Abstract
BACKGROUND AND AIMS Low high-density lipoprotein cholesterol (HDL-c) is a risk factor for cardiovascular disease. Brachial-ankle pulse wave velocity (baPWV) is an indicator of arterial stiffness, which is recognized as a predictor of cardiovascular disease. The aim of this study was to investigate the association between HDL-c and baPWV among middle-aged and elderly Chinese. METHODS A total number of 1133 Chinese (430 men, 703 women) aged from 50 to 90 years old were recruited from Shanghai downtown district. The baPWV and major cardiovascular risk factors of the participants were measured. RESULTS Serum HDL-c was negatively correlated with baPWV (r = -0.143, P < 0.001) after adjustment for age and gender. Multivariate linear regression analysis demonstrated that age (P < 0.001), systolic blood pressure (P < 0.001), HDL-c (P < 0.001), smoking (P = 0.001), BMI (P = 0.002), fasting plasma glucose (P = 0.004), and white blood cell (P = 0.005) were independently associated with baPWV. After multiple adjustments, participants in the highest quartile of HDL-c had an odds ratio of 0.442 (95% CI 0.268-0.729) for developing high arterial stiffness compared with participants in the lowest quartile. The association remained significant after further adjustment for major cardiovascular risk factors. CONCLUSION HDL-c has an independent protective effect on arterial stiffness in middle-aged and elderly Chinese. Early detection of HDL-c level is important in high risk populations with arterial stiffness. Increasing HDL-c level may be an attractive therapeutic target for the prevention of arterial function and subsequent disease.
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Affiliation(s)
- W W Zhao
- Department of Endocrinology and Diabetology, Huashan Hospital, Shanghai Medical College, Fudan University, No.12, Wulumuqi Middle Road, Shanghai 200040, China
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Feng XC, Milhausen M. Localization of Toxoplasma gondii in feline intestinal tissue using PCR. J Parasitol 1999; 85:1041-6. [PMID: 10647035] [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: 02/15/2023] Open
Abstract
Gametogony of Toxoplasma gondii occurs only in the epithelial cell layers within the intestine of the definitive feline host. Infected feline intestine is required in order to study the physiology, histology, and molecular biology of the gametogenic stages. Therefore, we set out to devise a rapid, conservative, and reproducible technique to determine which portions of the intestine were infected. Several methods of collecting and processing infected material were assessed for their ability to detect T. gondii. Infected and uninfected intestines from domestic cats were used to produce nitrocellulose lift impressions along the entire small intestine. The nitrocellulose was analyzed for the presence of T. gondii DNA using polymerase chain reaction (PCR) primers specific for the T. gondii alpha-tubulin gene. In addition, mucosal tissue scrapings, derived from segments of intestinal tissue, were used to isolate DNA and RNA for subsequent PCR and reverse transcriptase PCR analysis, respectively. The nitrocellulose impression lift method demonstrated distribution of parasite throughout the intestine. Histological staining and indirect immunofluorescence antibody analysis of sections obtained from the same infected tissue confirmed the presence of T. gondii intraepithelial stages. Comparison among the different techniques indicates that the nitrocellulose impression lift technique proved to be effective for easily and quickly assessing presence of T. gondii in infected tissue. This technique does not require a significant amount of the experimental material.
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Affiliation(s)
- X C Feng
- Heska Corporation, Fort Collins, Colorado 80525, USA
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Richter E, Feng XC, Wiessler M. Intestinal first-pass metabolism of nitrosamines. 4. Metabolism of N-nitrosodibutylamine in vascularly autoperfused jejunal and ileal loops of rats. Carcinogenesis 1990; 11:1517-21. [PMID: 2205408 DOI: 10.1093/carcin/11.9.1517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 12/30/2022] Open
Abstract
N-Nitrosodi-[1-14C]butylamine (NDBA) has been shown to undergo a high first-pass metabolism in isolated perfused rat small intestinal segments. Metabolites resulting from omega-hydroxylation of NDBA, the bladder carcinogens N-nitrosobutyl-(4-hydroxybutyl)amine (NB4HBA) and N-nitrosobutyl-(3-carboxypropyl)-amine (NB3CPA), accounted for greater than 90% of the total radioactivity absorbed. In the present study using vascularly perfused rat small intestinal segments, the high first-pass metabolism of NDBA could be confirmed under near in vivo conditions despite the much higher absorption rate. At the end of the 36 min experimental period 70-80% of the dose have been absorbed via the portal blood as opposed to 1-10% of the dose after 2 h in vitro perfusion. omega-Hydroxylation was again the most important metabolic pathway. However, the relationship of NB3CPA to NB4HBA was shifted in favor of NB4HBA, indicating a concentration and absorption rate dependency in the further metabolism of NB4HBA to NB3CPA.
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Affiliation(s)
- E Richter
- Walther Straub-Institut für Pharmakologie und Toxikologie, Ludwig-Maximilians-Universität München, FRG
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Fink E, Feng XC, Richter E. Studies on the intestinal absorption of tissue kallikrein. Adv Exp Med Biol 1989; 247B:663-8. [PMID: 2610102 DOI: 10.1007/978-1-4615-9546-5_109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- E Fink
- Abteilung für Klinische Chemie, Universität München
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Affiliation(s)
- X C Feng
- Walther Straub-Institut für Pharmakologie und Toxikologie, Ludwig-Maximilians-Universität München, FRG
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Conrady-Lorck S, Gareis M, Feng XC, Amselgruber W, Forth W, Fichtl B. Metabolism of T-2 toxin in vascularly autoperfused jejunal loops of rats. Toxicol Appl Pharmacol 1988; 94:23-33. [PMID: 3376112 DOI: 10.1016/0041-008x(88)90333-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The intestinal metabolism of T-2 toxin, a major trichothecene mycotoxin, was investigated in rats using the method of the vascularly autoperfused jejunal loop in situ. Tritium-labeled T-2 toxin was injected into the tied-off intestinal segments at a dose of 5 or 500 nmol, respectively. T-2 toxin and its metabolites in the blood draining from the jejunal loops, in the intestinal lumen, and in the intestinal tissue were determined by HPLC and GLC-MS. There was an extensive metabolic degradation of T-2 toxin, the metabolite pattern being similar for the two dosage levels. During the experimental period of 50 min only some 2% of the total dose appeared in the effluent plasma as unchanged T-2 toxin. Likewise at the end of the experiments unchanged T-2 toxin in the intestinal lumen and tissue was present in minute amounts only (less than 1% of the dose). HT-2 toxin was the main metabolite. About 25% of the total radioactivity administered appeared in the effluent plasma as HT-2 toxin, 18% in the lumen and 10% in the tissue. 3'-OH-HT-2 toxin accounted for 4-7% (effluent plasma), 5% (lumen), and 2% (tissue) of the total dose. Furthermore small amounts (less than 2% of the dose) of 3'-OH-T-2 toxin, T-2 tetraol, and 4-deacetylneosolaniol were found. No glucuronide or sulfate conjugates could be detected. In the jejunal segments which had been exposed to the 5-nmol dose only minimal morphological alterations were observed. On the other hand, in jejunal segments exposed to the high dose marked tissue damage was present. Nevertheless the gut tissue retained its ability to metabolize T-2 toxin. From the present results it is concluded that T-2 toxin is subject to a marked presystemic first pass effect after oral ingestion in vivo.
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Affiliation(s)
- S Conrady-Lorck
- Walther-Straub-Institute for Pharmacology and Toxicology, University of Munich, Federal Republic of Germany
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12
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Ye WL, Feng XC. [Potentiation of acupuncture analgesia by GABA in the dorsal raphe nucleus]. Sheng Li Xue Bao 1986; 38:123-31. [PMID: 3490696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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