1
|
Wang M, Zhou ZG, Lu TY, Du KP, Li S, Gao F, Li YD, Gao MY. [Efficacy analysis of hepatic arterial infusion chemotherapy combined with targeted and immune therapy followed by 125I seeds implantation in the treatment of hepatocellular carcinoma with portal vain tumor thrombus]. Zhonghua Yi Xue Za Zhi 2024; 104:290-296. [PMID: 38246774 DOI: 10.3760/cma.j.cn112137-20230830-00329] [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: 01/23/2024]
Abstract
Objective: To investigate the safety and efficacy of Hepatic Arterial Infusion Chemotherapy(HAIC) combined with targeted and immune therapy followed by 125I seeds implantation in portal vain tumor thrombus (PVTT) in the treatment of hepatocellular carcinoma(HCC) with PVTT. Methods: A retrospective study was performed on the clinical data of 21 patients [ (11 men, 10 women) aged 34-73 (52.6±13.7) years] with HCC with PVTT in The First Affiliated Hospital of Zhengzhou University from October 2020 to October 2022, all of them were treated with HAIC plus targeted and immune therapy,and 125I seeds implanted into PVTT. The patients were followed up to January 2023, the efficacy was evaluated according to the modified version of the solid tumor efficacy evaluation criteria (mRECIST). The progression-free survival (PFS) rate, overall survival(OS) rate and portal tumor thrombus control rate at 3, 6, 12 and 18 months after treatment were recorded, and PFS and OS time were followed up. The changes of liver function, AFP, coagulation function and adverse events were observed. Results: Each patient received 2 to 7 (mean: 3.3±1.2) cycles of HAIC. 10-37 seeds (mean:16.6±6.7) were implanted per patients. The median follow-up time was 15 (range from 5 to 25) months.During the follow-up time, 15 patients showed progression and 6 patients died, and the PFS rates at 3, 6, 12, and 18 months after treatment were 90.5%, 71.4%, 42.9%, and 23.8%, respectively, and at 3, 6, 12, and 18-month OS rates were 100%, 100%, 81.0%, and 61.9%, respectively.The PVTT control rates at 3, 6, and 12 months were 90.5%, 90.5%, and 62.5%, respectively. Overall efficacy evaluation of CR rate 0, PR rate 47.6% (10/21), SD rate 38.1% (8/21), and PD rate 14.3% (3/21). The total incidence of treatment-related adverse events was 100%.Grade 3 treatment related adverse events were observed for 4 cases, the rest wereⅠtoⅡadverse events. Right upper abdominal pain, fever and hemorrhage in liver capsule related to the procedures were observed in 11(52.4%), 5(23.8%) and 3(14.3) patients, respectively. Conclusion: HAIC combined with targeted and immune therapy followed by 125I seeds implantation in PVTT is a safe and efficacy therapy for HCC with PVTT.
Collapse
Affiliation(s)
- M Wang
- Department of Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Z G Zhou
- Department of Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - T Y Lu
- Department of Oncology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - K P Du
- Department of Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - S Li
- Department of Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - F Gao
- Department of Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Y D Li
- Department of Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - M Y Gao
- Department of Radiology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| |
Collapse
|
2
|
Lee HH, Wang CY, Chen ST, Lu TY, Chiang CH, Huang MY, Huang CJ. Electron stream effect in 0.35 Tesla magnetic resonance image guided radiotherapy for breast cancer. Front Oncol 2023; 13:1147775. [PMID: 37519814 PMCID: PMC10373926 DOI: 10.3389/fonc.2023.1147775] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Accepted: 06/26/2023] [Indexed: 08/01/2023] Open
Abstract
Purpose This research aimed to analyze electron stream effect (ESE) during magnetic resonance image guided radiotherapy (MRgRT) for breast cancer patients on a MR-Linac (0.35 Tesla, 6MV), with a focus on the prevention of redundant radiation exposure. Materials and methods RANDO phantom was used with and without the breast attachment in order to represent the patients after breast conserving surgery (BCS) and those received modified radical mastectomy (MRM). The prescription dose is 40.05 Gy in fifteen fractions for whole breast irradiation (WBI) or 20 Gy single shot for partial breast irradiation (PBI). Thirteen different portals of intensity-modulated radiation therapy were created. And then we evaluated dose distribution in five areas (on the skin of the tip of the nose, the chin, the neck, the abdomen and the thyroid.) outside of the irradiated field with and without 0.35 Tesla. In addition, we added a piece of bolus with the thickness of 1cm on the skin in order to compare the ESE difference with and without a bolus. Lastly, we loaded two patients' images for PBI comparison. Results We found that 0.35 Tesla caused redundant doses to the skin of the chin and the neck as high as 9.79% and 5.59% of the prescription dose in the BCS RANDO model, respectively. For RANDO phantom without the breast accessory (simulating MRM), the maximal dose increase were 8.71% and 4.67% of the prescription dose to the skin of the chin and the neck, respectively. Furthermore, the bolus we added efficiently decrease the unnecessary dose caused by ESE up to 59.8%. Conclusion We report the first physical investigation on successful avoidance of superfluous doses on a 0.35T MR-Linac for breast cancer patients. Future studies of MRgRT on the individual body shape and its association with ESE influence is warranted.
Collapse
Affiliation(s)
- Hsin-Hua Lee
- Ph.D. Program in Environmental and Occupational Medicine, Kaohsiung Medical University and National Health Research Institutes, Kaohsiung, Taiwan
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Radiation Oncology, Faculty of Medicine, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- Center for Cancer Research, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chun-Yen Wang
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Shan-Tzu Chen
- Department of Medical Imaging, Kaohsiung Municipal Siaogang Hospital, Kaohsiung, Taiwan
| | - Tzu-Ying Lu
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Cheng-Han Chiang
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Ming-Yii Huang
- Ph.D. Program in Environmental and Occupational Medicine, Kaohsiung Medical University and National Health Research Institutes, Kaohsiung, Taiwan
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Radiation Oncology, Faculty of Medicine, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- Center for Cancer Research, Kaohsiung Medical University, Kaohsiung, Taiwan
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chih-Jen Huang
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- Department of Radiation Oncology, Faculty of Medicine, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
- Center for Cancer Research, Kaohsiung Medical University, Kaohsiung, Taiwan
| |
Collapse
|
3
|
Chen F, Cheng YK, Chiang CH, Lu TY, Huang CJ. Simultaneous treatment of two lung cancer lesions with stereotactic MR-guided adaptive radiation therapy: A case report. Medicine (Baltimore) 2023; 102:e32626. [PMID: 36637933 PMCID: PMC9839273 DOI: 10.1097/md.0000000000032626] [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] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
RATIONALE Lung cancer is 1 of the most prevalent cancers globally. Definitive stereotactic ablative radiotherapy (SABR) is suggested for those who are unfit for or refuse surgical intervention. Here we present a patient with 2 lung cancer lesions who received SABR simultaneously with magnetic resonance Linear accelerator (Linac)-magnetic resonance (MR). PATIENT CONCERNS A 46-years-old man had history of left lower lung cancer post lobectomy in 2018. Two recurrent tumors were found 2 years following, then became enlarged 4 months later. DIAGNOSES The recurrent tumors were found by computed tomography. INTERVENTIONS SABR was indicated due to inoperability and small size. Simulation was done both by computed tomography and MR scan with ViewRay MRIdian Linac, with the prescription dose being 50 gray in 4 fractions performed every other day within 2 weeks. The 2 lesions were irradiated at the same time with a single isocenter with mean treatment time was 78 minutes. OUTCOMES No acute side effect was noted. Follow-up chest computed tomography scan 14 months after SABR showed mild consolidation and pneumonitis over the upper irradiated site favoring radiation-related reasons, while pneumonitis was resolved over the lower irradiated site. Positron emission tomography showed no definite evidence of FDG-avid recurrence. The patient has survived over 18 months following SABR and more than 4 years from the first diagnosis of lung cancer without significant adverse effects. LESSONS Simultaneous SABR for multiple lung lesions is quite challenging because tumor motion by breathing can increase the risk of missing the target. With help by MR-Linac, simultaneous SABR to multiple lung lesions can be performed safely with efficacy.
Collapse
Affiliation(s)
- Frank Chen
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yuan-Kai Cheng
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chen-Han Chiang
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Tzu-Ying Lu
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chih-Jen Huang
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
- * Correspondence: Chih-Jen Huang, Department of Radiation Oncology, Kaohsiung Medical University Hospital, 100 Tzyou 1st Road, Kaohsiung 807, Taiwan (e-mail: )
| |
Collapse
|
4
|
Huang CJ, Huang MY, Shih MCP, Cheng KY, Lee KW, Lu TY, Yuan SS, Fang PT. Post-radiation sinusitis is associated with recurrence in nasopharyngeal carcinoma patients treated with intensity-modulated radiation therapy. Radiat Oncol 2019; 14:61. [PMID: 30971260 PMCID: PMC6458621 DOI: 10.1186/s13014-019-1261-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 03/27/2019] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND This study investigated the impact of post-radiation sinusitis on the prognosis of nasopharyngeal carcinoma (NPC) patients treated with intensity-modulated radiation therapy (IMRT). METHODS Two hundred and thirty patients with non-metastatic NPC were analyzed in terms of freedom from local failure (FFLF), freedom from distant failure (FFDF), overall survival (OS), and disease-free survival (DFS). For each patient, the status of the sinus mucosa was flexibly assessed by documenting mucosal changes as indicated by differences between images obtained before radiotherapy and more than 6 months post-radiation. RESULTS With a median follow-up of 39.7 months (8 to 81 months), 19 (8.26%) patients relapsed locally, 13 (5.65%) patients failed in the neck, and 26 (11.3%) patients developed distant metastases. The presence of sinusitis noted in images post-radiation was a significant predictor for DFS (p = 0.001), FFLF (p = 0.004), and FFDF (p = 0.015), in addition to having high negative predictive value for local relapse (97.5%). CONCLUSIONS This is the first study to investigate the prognostic value of post-radiation sinusitis in NPC patients treated with IMRT. Post-radiation sinusitis was found to be a significant predictor for DFS, FFLF, and FFDF, and was also found to have high negative predictive value for local recurrence (97.5%). It may thus be used as an additional tool for clinicians to determine the possibility of recurrence.
Collapse
Affiliation(s)
- Chih-Jen Huang
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, No.100, Tzyou 1st Road, Kaohsiung, 807 Taiwan
- Department of Radiation Oncology, Faculty of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Ming-Yii Huang
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, No.100, Tzyou 1st Road, Kaohsiung, 807 Taiwan
- Department of Radiation Oncology, Faculty of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Ming-Chen Paul Shih
- Department of Medical imaging, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
- Department of Radiology, Faculty of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Kai-yuan Cheng
- Department of Otolaryngology-Head and Neck Surgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Ka-Wo Lee
- Department of Otolaryngology-Head and Neck Surgery, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Tzu-Ying Lu
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, No.100, Tzyou 1st Road, Kaohsiung, 807 Taiwan
- Department of Radiation Oncology, Faculty of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Shyng-Shiou Yuan
- Translational Research Center, Department of Obstetrics and Gynecology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Pen-Tzu Fang
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, No.100, Tzyou 1st Road, Kaohsiung, 807 Taiwan
- Department of Radiation Oncology, Faculty of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| |
Collapse
|
5
|
Lu TY, Mao X, Peng EL, Li JM, Geng WQ, Jiang YJ, Xu JJ. [Bibliometric analysis on research hotspots on HIV post-exposure prophylaxis related articles in the world, 2000-2017]. Zhonghua Liu Xing Bing Xue Za Zhi 2019; 39:1501-1506. [PMID: 30462962 DOI: 10.3760/cma.j.issn.0254-6450.2018.11.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To analyze and reveal the distribution, research hotspots and study trend of worldwide published articles correlated with HIV/AIDS post-exposure prophylaxis (PEP), and provide information for related studies in China. Methods: CiteSpace software 5.1 was used to visualize all related papers in the web of science database published during 2000-2017. Results: The average growth rate of international PEP-related papers was 10.78%,and number of published papers in 2016 was highest (n=34), relevant research hotspots have shifted from the prevention of occupational HIV exposure to the prevention of non-occupational HIV exposure in group at high risk, such as MSM, in recent years. Clustering analysis classified research hotspots into three categories, including risk reduction through enhanced intervention, current status of global HIV PEP and German-Austrian Recommendation. Conclusions: Non-occupational HIV PEP in groups at high-risk, especially MSM, has received increasing attention in recent years, the research of PEP mainly focus on improving the awareness and use of PEP in MSM and compliance in the course of medication. In the context of severe HIV epidemic in MSM without effective control in China, PEP should be strengthened to assess and explore the risk of HIV infection in MSM to provide reference for medical personnel and related departments to implement HIV non-occupation exposure blockade and formulate PEP medication.
Collapse
Affiliation(s)
- T Y Lu
- Department of Laboratory Medicine, Key Laboratory of AIDS Immunology of National Health Commission, Key Laboratory of AIDS Immunology of Liaoning Province, Key Laboratory of AIDS Immunology of Chinese Academy of Medical Sciences, The First Affiliated Hospital of China Medical University, Shenyang 110001, China
| | | | | | | | | | | | | |
Collapse
|
6
|
Hsieh YJ, Lu TY, Ke CC, Lin YS, Tai HT, Liu SI, Liang TJ, Su HH, Liu RS, Peng NJ. Correlation of 18F-FDG uptake and thyroid cancer stem cells. Q J Nucl Med Mol Imaging 2018; 64:393-399. [PMID: 30160089 DOI: 10.23736/s1824-4785.18.03088-1] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
BACKGROUND 2-deoxy-2-[18F]fluoro-D-glucose positron emission tomography (18F-FDG PET) has the potential to detect various types of cancers, including thyroid cancer (TC), at a potentially curable stage. Increased uptake of 18F-FDG was observed in anaplastic and poorly differentiated thyroid cancer cells, and PET-positive tumors are more likely to be resistant to 131I treatment. As cancer stem cells (CSCs) possess a dedifferentiated phenotype and are resistant to many anticancer therapies, we hypothesized that the expression of CSC-related markers is correlated with the ability of tumor cells in TC to uptake FDG. METHODS The present study cohort included 12 patients with TC, who underwent 18F-FDG PET/CT imaging before surgery. Quantitative polymerase chain reaction (QPCR) and immunohistochemical (IHC) staining were performed to analyze the expression patterns of gene markers related to embryonic stem (ES) cells and CSCs in TC. RESULTS The mRNA expression levels of CSC- (CD133 and CD44) and ES-related genes (Oct4 and Nanog) were higher in TC tissue than in normal thyroid tissue, whereas the mRNA expression levels of thyroid-specific genes (Tg, TSHR, and TTF1) were higher in normal thyroid tissue than in TC tissue. There was a positive and statistically significant correlation between FDG uptake (SUV<inf>max</inf>) of tumor and relative mRNA levels of CD133, CD44, Oct4, and Nanog. The IHC results demonstrated that CD133 and Nanog were expressed in TC tissue but not in normal thyroid tissue, however, CD44 expression was observed in both TC and normal thyroid tissue. Comparisons of the clinicopathological parameters between TC tissues with low and high SUV<inf>max</inf> demonstrated significant differences in protein level of CD133 but not in that of Nanog. CONCLUSIONS The pre-therapeutic tumor SUV<inf>max</inf> obtained from 18F-FDG PET/CT may be a potential predictor for evaluating the proportion of CSC population in individual patients with TC.
Collapse
Affiliation(s)
- Ya-Ju Hsieh
- Department of Medical Imaging and Radiological Sciences, Drug Development and Value Creation Research Center, Kaohsiung Medical University, Kaohsiung, Taiwan.,Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Tzu-Ying Lu
- Department of Radiation Oncology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Chien-Chih Ke
- Biomedical Imaging Research Center, National Yang-Ming University, Taipei, Taiwan.,Molecular and Genetic Imaging Core, Taiwan Mouse Clinic, National Comprehensive Mouse Phenotyping and Drug Testing Center, Taipei, Taiwan
| | - Yaoh-Shiang Lin
- Department of Otolaryngology Head and Neck, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Hsiao-Ting Tai
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Shiuh-Inn Liu
- Division of General Surgery, Department of Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Tsung-Jung Liang
- Division of General Surgery, Department of Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Hsing-Hao Su
- Department of Otolaryngology Head and Neck, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Ren-Shyan Liu
- Biomedical Imaging Research Center, National Yang-Ming University, Taipei, Taiwan.,Molecular and Genetic Imaging Core, Taiwan Mouse Clinic, National Comprehensive Mouse Phenotyping and Drug Testing Center, Taipei, Taiwan.,National PET/Cyclotron Center and Department of Nuclear Medicine, Taipei Veterans General Hospital, Taipei, Taiwan.,Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan.,Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan.,Biophotonic and Molecular Imaging Research Center, National Yang-Ming University, Taipei, Taiwan
| | - Nan-Jing Peng
- National Yang-Ming University School of Medicine, Taipei, Taiwan - .,Department of Nuclear Medicine, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| |
Collapse
|
7
|
Ferrer CM, Lu TY, Bacigalupa ZA, Katsetos CD, Sinclair DA, Reginato MJ. O-GlcNAcylation regulates breast cancer metastasis via SIRT1 modulation of FOXM1 pathway. Oncogene 2016; 36:559-569. [PMID: 27345396 PMCID: PMC5192006 DOI: 10.1038/onc.2016.228] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 03/24/2016] [Accepted: 04/15/2016] [Indexed: 12/15/2022]
Abstract
Tumors utilize aerobic glycolysis to support growth and invasion. However, the molecular mechanisms that link metabolism with invasion are not well understood. The nutrient sensor O-linked-β-N-acetylglucosamine (O-GlcNAc) transferase (OGT) modifies intracellular proteins with N-acetylglucosamine. Cancers display elevated O-GlcNAcylation and suppression of O-GlcNAcylation inhibits cancer invasion and metastasis. Here, we show that the regulation of cancer invasion by OGT is dependent on the NAD+-dependent deacetylase SIRT1. Reducing O-GlcNAcylation elevates SIRT1 levels and activity in an AMPK-dependent manner. Reduced O-GlcNAcylation in cancer cells leads to SIRT1-mediated proteasomal degradation of oncogenic transcription factor FOXM1 in a MEK/ERK-dependent manner. SIRT1 is critical for OGT-mediated regulation of FOXM1 ubiquitination and reducing SIRT1 activity reverses OGT-mediated regulation of FOXM1. Moreover, we show that SIRT1 levels are required for OGT-mediated regulation of invasion and metastasis in breast cancer cells. Thus, O-GlcNAcylation is a central component linking metabolism to invasion and metastasis via a SIRT1/ /FOXM1 axis.
Collapse
Affiliation(s)
- C M Ferrer
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, Philadelphia, PA, USA
| | - T Y Lu
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, Philadelphia, PA, USA
| | - Z A Bacigalupa
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, Philadelphia, PA, USA
| | - C D Katsetos
- Department of Pathology and Laboratory Medicine, Drexel University College of Medicine, Philadelphia, PA, USA.,Department of Pediatrics, Drexel University College of Medicine, St. Christopher's Hospital for Children, Philadelphia, PA, USA
| | - D A Sinclair
- Paul F. Glenn Labs for the Biological Mechanisms of Aging, Department of Genetics, Harvard Medical School, Boston, MA, USA
| | - M J Reginato
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, Philadelphia, PA, USA
| |
Collapse
|
8
|
Jung CH, Hartman FC, Lu TY, Larimer FW. D-ribose-5-phosphate isomerase from spinach: heterologous overexpression, purification, characterization, and site-directed mutagenesis of the recombinant enzyme. Arch Biochem Biophys 2000; 373:409-17. [PMID: 10620366 DOI: 10.1006/abbi.1999.1554] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [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: 11/22/2022]
Abstract
A cDNA encoding spinach chloroplastic ribose-5-phosphate isomerase (RPI) was cloned and overexpressed in Escherichia coli, and a purification scheme for the recombinant enzyme was developed. The purified recombinant RPI is a homodimer of 25-kDa subunits and shows kinetic properties similar to those of the homodimeric enzyme isolated from spinach leaves (A. C. Rutner, 1970, Biochemistry 9, 178-184). Phosphate, used as a buffer in previous studies, is a competitive inhibitor of RPI with a K(i) of 7.9 mM. D-Arabinose 5-phosphate is an effective inhibitor, while D-xylulose-5 phosphate is not, indicating that the configuration at carbon-3 contributes to substrate recognition. Although D-arabinose 5-phosphate binds to RPI, it is not isomerized, demonstrating that the configuration at carbon-2 is crucial for catalysis. Alignment of RPI sequences from diverse sources showed that only 11 charged amino acid residues of the 236-residue subunit are conserved. The possible function of four of these residues was examined by site-directed mutagenesis. D87A, K100A, and D90A mutants show greatly diminished k(cat) values (0. 0012, 0.074, and 0.38% of the wild type, respectively), while E91A retains substantial activity. Only insignificant or moderate changes in K(m) of D-ribose 5-phosphate are observed for D87A, K100A, and D90A, indicating a direct or indirect catalytic role of the targeted residues.
Collapse
Affiliation(s)
- C H Jung
- Life Sciences Division, The University of Tennessee-Oak Ridge Graduate School of Biomedical Sciences, Oak Ridge, Tennessee 37831-2009, USA
| | | | | | | |
Collapse
|
9
|
Chen YR, Hartman FC, Lu TY, Larimer FW. D-Ribulose-5-phosphate 3-epimerase: cloning and heterologous expression of the spinach gene, and purification and characterization of the recombinant enzyme. Plant Physiol 1998; 118:199-207. [PMID: 9733539 PMCID: PMC34857 DOI: 10.1104/pp.118.1.199] [Citation(s) in RCA: 9] [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] [Subscribe] [Scholar Register] [Received: 04/30/1998] [Accepted: 06/12/1998] [Indexed: 05/22/2023]
Abstract
We have achieved, to our knowledge, the first high-level heterologous expression of the gene encoding D-ribulose-5-phosphate 3-epimerase from any source, thereby permitting isolation and characterization of the epimerase as found in photosynthetic organisms. The extremely labile recombinant spinach (Spinacia oleracea L.) enzyme was stabilized by DL-alpha-glycerophosphate or ethanol and destabilized by D-ribulose-5-phosphate or 2-mercaptoethanol. Despite this lability, the unprecedentedly high specific activity of the purified material indicates that the structural integrity of the enzyme is maintained throughout isolation. Ethylenediaminetetraacetate and divalent metal cations did not affect epimerase activity, thereby excluding a requirement for the latter in catalysis. As deduced from the sequence of the cloned spinach gene and the electrophoretic mobility under denaturing conditions of the purified recombinant enzyme, its 25-kD subunit size was about the same as that of the corresponding epimerases of yeast and mammals. However, in contrast to these other species, the recombinant spinach enzyme was octameric rather than dimeric, as assessed by gel filtration and polyacrylamide gel electrophoresis under nondenaturing conditions. Western-blot analyses with antibodies to the purified recombinant enzyme confirmed that the epimerase extracted from spinach leaves is also octameric.
Collapse
Affiliation(s)
- Y R Chen
- University of Tennessee-Oak Ridge Graduate School of Biomedical Sciences, Oak Ridge, Tennessee 37831, USA
| | | | | | | |
Collapse
|
10
|
Abstract
Phosphoribulokinase is one of several Calvin cycle enzymes that are light-regulated via the ferredoxin-thioredoxin system (R. A. Wolosiuk and B. B. Buchanan, 1978, Arch. Biochem. Biophys. 189, 97-101). Substitution of the only two Trp residues of the enzyme was prompted by the following goals: to identify each tryptophanyl residue with respect to prior classifications as exposed and buried (C. A. Ghiron et al., 1988, Arch. Biochem. Biophys. 260, 267-272); to explore the possible active-site location and function of conserved Trp155, as suggested by sequence proximity to catalytic Asp160 (H. A. Charlier et al., 1994, Biochemistry 33, 9343-9350); and to determine if fluorescence of a Trp residue can serve as a gauge of conformational differences between the reduced (active) and the oxidized (inactive) forms of the enzyme. Emission spectra and acrylamide quenching data demonstrate that Trp155 is solvent exposed, while Trp241 is buried. Kinetic parameters of the W241F mutant are not significantly altered relative to those of wild-type enzyme, thereby discounting any requirement for Trp at position 241. While substitution of Trp155 with Phe or Ala has little impact on Vmax, the Km for Ru5P and ATP are increased substantially; the diminished affinity for ATP is particularly pronounced in the case of the Ala substitution. In further support of an active-site location of Trp155, its fluorescence emission is subject to quenching by nucleotides. Fluorescence quenching of reduced W241F by ATP gives a dissociation constant (Kd) of 37 microM, virtually identical with its Km of 46 microM, and provides for the first time a direct measurement of the interaction of the kinase with product ADP (Kd of 1.3 mM). Fluorescence quenching of oxidized W241F by ATP reveals a Kd of 28 mM; however, this weakened binding does not reflect an altered microenvironment of Trp155, as its steady-state emission and fluorescence lifetimes are unaffected by the oxidation state.
Collapse
Affiliation(s)
- H K Brandes
- Life Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | | | | | | | | |
Collapse
|
11
|
Brandes HK, Hartman FC, Lu TY, Larimer FW. Efficient expression of the gene for spinach phosphoribulokinase in Pichia pastoris and utilization of the recombinant enzyme to explore the role of regulatory cysteinyl residues by site-directed mutagenesis. J Biol Chem 1996; 271:6490-6. [PMID: 8626451 DOI: 10.1074/jbc.271.11.6490] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.5] [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: 01/31/2023] Open
Abstract
Phosphoribulokinase (PRK), unique to photosynthetic organisms, is regulated in higher plants by thioredoxin-mediated thiol-disulfide exchange in a light-dependent manner. Prior attempts to overexpress the higher plant PRK gene in Escherichia coli for structure-function studies have been hampered by sensitivity of the recombinant protein to proteolysis as well as toxic effects of the protein on the host. To overcome these impediments, we have spliced the spinach PRK coding sequence immediately downstream from the AOX1 (alcohol oxidase) promoter of Pichia pastoris, displacing the chromosomal AOX1 gene. The PRK gene is now expressed, in response to methanol, at 4-6% of total soluble protein, without significant in vivo degradation of the recombinant enzyme. This recombinant spinach PRK is purified to homogeneity by successive anion-exchange and dye-affinity chromatography and is shown to be electrophoretically and kinetically indistinguishable from the authentic spinach counterpart. Site-specific replacement of all of PRK's cysteinyl residues (both individually and in combination) demonstrates a modest catalytically facilitative role for Cys-55 (one of the regulatory residues) and the lack of any catalytic role for Cys-16 (the other regulatory residue), Cys-244, or Cys-250. Mutants with seryl substitutions at position 55 display non-hyperbolic kinetics relative to the concentration of ribulose 5-phosphate. Sulfate restores hyperbolic kinetics and enhances kinase activity, presumably reflecting conformational differences between the position 55 mutants and wild-type enzyme. Catalytic competence of the C16S-C55S double mutant proves that mere loss of free sulfhydryl groups by oxidative regulation cannot account entirely for the accompanying total inactivation.
Collapse
Affiliation(s)
- H K Brandes
- Protein Engineering Program, Biology Division, Oak Ridge National Laboratory, Tennessee 37831, USA
| | | | | | | |
Collapse
|
12
|
Mural RJ, Lu TY, Hartman FC. The role of an active-site lysyl residue of spinach phosphoribulokinase as explored by site-directed mutagenesis. J Protein Chem 1993; 12:207-13. [PMID: 8387794 DOI: 10.1007/bf01026042] [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] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Based on selective labeling by ATP analogues, Lys68 of the Calvin Cycle enzyme phosphoribulokinase (PRK) from spinach has been assigned to the active-site region [Miziorko et al. (1990), J. Biol. Chem. 265, 3642-3647]. The equivalent position is occupied by lysyl or arginyl residues in the PRK from both prokaryotic and eukaryotic sources, suggesting a requirement for a basic residue at this location. To examine this possibility, we have replaced Lys68 of the spinach enzyme with arginyl, glutaminyl, alanyl, or glutamyl residues by site-directed mutagenesis. All of the mutant enzymes retain substantial kinase activity; and even in the case of the radical substitution by glutamate, the Km values for ATP and ribulose 5-phosphate are not perturbed significantly. Glutamate at position-68 may destabilize tertiary structure, because the yield of this mutant protein from transformed E. coli is quite low compared to that of the other proteins in this series. Despite the active-site proximity of Lys68, our results show that this residue does not play a key role in catalysis or substrate binding.
Collapse
Affiliation(s)
- R J Mural
- Biology Division, Oak Ridge National Laboratory, Tennessee 37831-8077
| | | | | |
Collapse
|
13
|
Zhang Q, Maroof MA, Lu TY, Shen BZ. Genetic diversity and differentiation of indica and japonica rice detected by RFLP analysis. Theor Appl Genet 1992; 83:495-9. [PMID: 24202597 DOI: 10.1007/bf00226539] [Citation(s) in RCA: 74] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/1991] [Accepted: 05/29/1991] [Indexed: 05/10/2023]
Abstract
Genetic diversity and differentiation in indica and japonica groups of the cultivated rice (Oryza sativa L.) were studied by assaying DNA restriction fragment length polymorphisms of 12 indica and 14 japonica rice lines digested with three restriction endonucleases. A total of 49 probes were selected to represent the entire RFLP map at intervals of 20-30 cM. It was shown that 95 of the 145 possible probe/enzyme combinations, involving 43 probes and all three enzymes, detected restriction fragment length variation, and the degree of polymorphism varied greatly from one probe/enzyme combination to another. These results demonstrate that indica rice is genetically more diverse than japonica type. Significant differentiation between the two rice groups was detected by 33 probes representing 11 of the 12 rice chromosomes. It was deduced that the processes leading to differentiation involved a combination of molecular events that include base substitutions and insertion/deletions.
Collapse
Affiliation(s)
- Q Zhang
- Biotechnology Center, Huazhong Agricultural University, 430070, Wuhan, China
| | | | | | | |
Collapse
|
14
|
Abstract
Tetraploid mouse embryos were produced by cytochalasin B treatment. These embryos usually die before completion of embryonic development and are abnormal morphologically and physiologically. The tetraploid embryos can be rescued to develop to maturity by aggregating them with normal diploid embryos to produce diploid/tetraploid chimeric mice. The diploid/tetraploid chimeric embryos are frequently abnormal: the larger the proportion of tetraploid cells, the greater the abnormality. By karyotype analysis and by the use of appropriate pigment cell markers, we have demonstrated that two of our surviving chimeras are in fact diploid/tetraploid chimeras. One surviving chimera is retarded in growth and displays neurological abnormalities. The coat color chimerism suggests that this chimera is about 50% tetraploid. Another chimera with about 10% tetraploid pigment cells in the coat is only slightly retarded in growth and is a fertile male. Tetraploid cells are distributed in many, if not all, tissues of embryos but evidently are physiologically inadequate to support completely normal development and function in the absence of substantial numbers of normal diploid cells.
Collapse
|
15
|
Abstract
Acid-induced growth was compared to auxin-induced growth. After a transient pH 4-induced increase in the elongation rate was completed, auxin could still induce an enhanced rate of elongation in soybean (Glycine max) hypocotyl segments. This auxin response occurred both when the medium was changed to pH 6 before auxin addition, and when the auxin was added directly to the pH 4 medium. This postacid response to auxin was persistent, and quite unlike a postacid response to acid, which was again shortlived. One mm N-2-hydroxyethylpiperazine-N'-2-ethanesulfonic acid (pH 7) inhibited the first response to auxin (the first response to auxin being similar to the acid response), but not the second response. This did not appear to be simply a hydrogen ion neutralizing effect, however, since a 50-fold increase in buffer concentration at pH 6 did not inhibit the first response. Decrease in the pH of the external medium, previously shown to occur with excised soybean hypocotyl segments, was not affected by auxin. Furthermore, this pH drop, during which the cells appear to be adjusting their external pH to about 5.4, did not result in an increased rate of elongation. Addition of auxin after the equilibrium pH had been attained did not alter the pH, but it did increase the rate of elongation, eliciting a normal auxin response. It was concluded that hydrogen ions do not mediate in long term auxin-induced elongation in soybean hypocotyl.
Collapse
Affiliation(s)
- L N Vanderhoef
- Department of Botany, University of Illinois, Urbana, Illinois 61801
| | | | | |
Collapse
|
16
|
Vanderhoef LN, Stahl CA, Lu TY. Two elongation responses to auxin respond differently to protein synthesis inhibition. Plant Physiol 1976; 58:402-4. [PMID: 16659687 PMCID: PMC542255 DOI: 10.1104/pp.58.3.402] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The first and second responses to auxin react differently to the inhibition of protein synthesis by cycloheximide. It was determined that the protein with the shortest half-life, among the several necessary for the first response, is different from its counterpart among the several necessary for the second response. Specifically, the protein half-lives are 28 minutes and 11 minutes for the first and second responses, respectively.
Collapse
Affiliation(s)
- L N Vanderhoef
- Department of Botany, University of Illinois, Urbana, Illinois 61801
| | | | | |
Collapse
|
17
|
Lu TY. Cryogenic extraction of cataracts. Chin Med J 1966; 85:542-7. [PMID: 5968927] [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: 01/17/2023]
|