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Nguyen THV, Tran TT, Do HN, Quan PM, Pham CB, Dang HH, Lam DT, Minh PTH. A new benzophenanthridine alkaloid from stem bark of Zanthoxylum rhetsa and its biological activities. Nat Prod Res 2023:1-13. [PMID: 38146230 DOI: 10.1080/14786419.2023.2297261] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 12/11/2023] [Indexed: 12/27/2023]
Abstract
A new benzophenanthridine alkaloid 6-butanoyldihydrochelerythrine (1) and five known alkaloids 6-acetonyldihydronitidine (2), 6-acetonyldihydrochelerythrine (3), isocorydine (4), (O)-methyltembamide (5), N-(4-methoxyphenethyl)benzamide (6) were isolated from the stem barks of Zanthoxylum rhetsa. These structures were elucidated by 1D, 2D NMR spectroscopy and by mass spectrometry. This is the first time that compounds 2-6 were identified from Zanthoxylum rhetsa and the first time that compounds 4 and 6 were identified from the genus Zanthoxylum. Bioactivity results of isolated compounds showed that 1, 2, 5 and 6 exhibited inhibitory activity against MCF7 and A549 cell lines, while 3 showed the inhibitory activity against A549 cell line; all isolated compounds 1-6 inhibited at least two strain microorganisms; compound 4 showed angiotensin II converting enzyme inhibitory activity in vitro with IC50 value of 65.58 µM and in silico with a docking score of -11.52 kcal/mol.
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Affiliation(s)
- Thi Hong Van Nguyen
- Institute of Natural Product Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
- Graduate University of Science and Techology, VAST, 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
| | - Thi Tuyen Tran
- Institute of Natural Product Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
| | - Huu Nghi Do
- Institute of Natural Product Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
- Graduate University of Science and Techology, VAST, 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
| | - Pham Minh Quan
- Institute of Natural Product Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
- Graduate University of Science and Techology, VAST, 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
| | - Cao Bach Pham
- Institute of Natural Product Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
| | - Hoang Hiep Dang
- University of Science and Technology of Hanoi, VAST, 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
| | - Do Tien Lam
- Institute of Natural Product Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
| | - Pham Thi Hong Minh
- Institute of Natural Product Chemistry (INPC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
- Graduate University of Science and Techology, VAST, 18 Hoang Quoc Viet street, Cau Giay, Hanoi, Vietnam
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Le XD, Pham Thi NM, Cam TI, Do HN, Nguyen Thi HV, Thang TD, Thao LPP, Do TS, Nguyen TD, Pham QL, Dao TP, Pham TN, Tran QT. Optimization of the Essential Oil Extraction Process from Dong Van Marjoram ( E. winitiana var. dongvanensis Phuong.) by Using Microwave Assisted Hydrodistillation, and the Bioactivities of the Oil Against Some Cancer Cell Lines and Bacteria. Nat Prod Commun 2021. [DOI: 10.1177/1934578x211054235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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
This study reports on the optimization of a microwave-assisted distillation process to obtain Dong Van marjoram essential oil, and the determination of its composition, content of constituents, and cytotoxic and antimicrobial activities. Using the response surface method (RSM), the optimal essential oil distillation conditions were determined as material size 0.74 (cm), water to material ratio 4.14:1 (mL/g), microwave power 302.4 (W), and distillation time 2.1 hours. At optimal conditions, the mass of Dong Van marjoram essential oil obtained was 0.887 ± 0.007 g, corresponding to a content of 0.6% essential oil in the material. GC-MS and GC-FID methods showed that the main chemical constituents of Dong Van marjoram essential oils obtained were rosefuran epoxide (44.9%), caryophyllene (10.8%), germacrene D (2.6%), and α-humulene (1.3%). The essential oil exhibited moderate inhibition against both tested cancer cell lines, with IC50 values of 23.9 µg/mL (for PC3) and 56.2 µg/mL (for A549). However, the oil exhibited strong effectiveness against three bacterial strains, Escherichia coli, Bacillus subtilis, and Staphylococcus aureus, and a yeast strain, Saccharomyces cerevisiae, with minimal inhibitory concentration (MIC) values ranged from 50 to 100 µg/mL.
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Affiliation(s)
- Xuan Duy Le
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
| | - Ngoc Mai Pham Thi
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
- Thai Nguyen University of Agriculture and Forestry, Thai Nguyen, Vietnam
| | - Thi Inh Cam
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
| | - Huu Nghi Do
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
| | - Hong Van Nguyen Thi
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
| | - Tran Dinh Thang
- Institute of Biotechnology and Food Technology, Industrial University of Ho Chi Minh City, HCM City, Vietnam
| | - Lai Phuong Phuong Thao
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
| | - Trung Sy Do
- Institute of Chemistry, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
| | - Thanh Duong Nguyen
- Institute of Chemistry, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
| | - Quoc Long Pham
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
| | - Tan Phat Dao
- Institute of Environmental Sciences, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
- Faculty of Environmental and Food Engineering, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
| | - Tri Nhut Pham
- Institute of Environmental Sciences, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
- Faculty of Environmental and Food Engineering, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
| | - Quoc Toan Tran
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Ha Noi, Vietnam
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Phan KS, Ha PT, Do HN, Nguyen TA, Bui TQ, Pham HN, Le MH, Le TTH. Dual Loading of Doxorubicin and Magnetic Iron Oxide into PLA-TPGS Nanoparticles: Design, in vitro Drug Release Kinetics, and Biological Effects on Cancer Cells. ChemMedChem 2021; 16:3615-3625. [PMID: 34523806 DOI: 10.1002/cmdc.202100535] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Revised: 09/10/2021] [Indexed: 11/12/2022]
Abstract
The multifunctional nano drug delivery system (MNDDS) has much revolutionized in cancer treatment, aiming to eliminate many disadvantages of conventional formulations. This paper herein proposes and demonstrates MNDDS inspired by poly(lactide)-tocopheryl polyethylene glycol succinate (PLA-TPGS) copolymer co-loaded Doxorubicin and magnetic iron oxide nanoparticles (MIONs) with a 1 : 1 (w/w) optimal ratio. In vitro drug release kinetics of Doxorubicin from this nanosystem fitted best to the Weibull kinetic model and can be described by the classical Fickian diffusion mechanism under acidic pH conditions. The combination of MIONs and Doxorubicin in the PLA-TPGS copolymer has maintained the fluorescence properties of Doxorubicin and good cell penetration, especially inside the nucleus and its vicinity. Moreover, different cell cycle profiles were observed in HeLa cell lines treated with MNDDSs.
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Affiliation(s)
- Ke Son Phan
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam.,Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam
| | - Phuong Thu Ha
- Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam
| | - Huu Nghi Do
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam
| | - Trung Anh Nguyen
- Hanoi Medical University, 1 Ton That Tung, Dong Da District, Hanoi, Vietnam
| | - Thuc Quang Bui
- Hanoi Medical University, 1 Ton That Tung, Dong Da District, Hanoi, Vietnam
| | - Hong Nam Pham
- Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam
| | - Mai Huong Le
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam
| | - Thi Thu Huong Le
- Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam.,Faculty of Natural Resources and Environment, Vietnam National University of Agriculture, Trau Quy, Gia Lam District, Hanoi, Vietnam
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Tran QT, Pham TD, Nguyen TD, Luu VH, Nghi Do H, Duy Le X, Nguyen PH, Nguyen MC, Luu VC, Pham MQ, Huyen Vu T, Pham TN, Pham DTN. Optimization of Murrayafoline A ethanol extraction process from the roots of Glycosmis stenocarpa, and evaluation of its Tumorigenesis inhibition activity on Hep-G2 cells. OPEN CHEM 2021. [DOI: 10.1515/chem-2021-0067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Glycosmis stenocarpa is a species of shrub found in the Northern provinces of Vietnam. Its roots contain different carbazolic derivatives, mainly Murrayafoline A (Mu-A), which exhibits valuable biological activities. In this study, we performed an extraction of Mu-A from the roots of G. stenocarpa and optimized this process using response surface methodology (RSM) according to a central composite design, with three independent parameters including extraction time (min), extraction temperature (°C), and solvent/material ratio (mL/g). Two dependent variables were the Mu-A content (mg/g raw materials) and extraction efficiency (%). The optimal conditions to extract Mu-A were found to be as follows: extraction temperature, 67°C; extraction time, 165 min; and solvent/material ratio, 5:1. Under these conditions, the Mu-A content and extraction efficiency were 38.94 ± 1.31 mg/g raw materials and 34.98 ± 1.18%, respectively. Mu-A exhibited antiproliferation and antitumor-promoting activity against the HepG-2 cell line. The present optimization work of Mu-A extraction from G. stenocarpa roots contributed to the attempt of designing a large-scale extraction process for the compound and further exploitation of its potential in vivo applications.
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Affiliation(s)
- Quoc Toan Tran
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology , 18 Hoang Quoc Viet St., Cau Giay Dist. , Hanoi 10072 , Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology , Hanoi 10072 , Vietnam
| | - The Dan Pham
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology (VAST) , 18 Hoang Quoc Viet, Cau Giay , Hanoi , Vietnam
| | - Thanh Duong Nguyen
- Institute of Chemistry, Vietnam Academy of Science and Technology , 18 Hoang Quoc Viet St., Cau Giay Dist. , Hanoi 10072 , Vietnam
| | - Van Huyen Luu
- Faculty of Environment, Hanoi University of Natural Resources and Environment , No 41A Phu Dien Road, Phu Dien Precinct, North-Tu Liem District , Hanoi , Vietnam
| | - Huu Nghi Do
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology , 18 Hoang Quoc Viet St., Cau Giay Dist. , Hanoi 10072 , Vietnam
| | - Xuan Duy Le
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology , 18 Hoang Quoc Viet St., Cau Giay Dist. , Hanoi 10072 , Vietnam
| | - Phi Hung Nguyen
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology , 18 Hoang Quoc Viet St., Cau Giay Dist. , Hanoi 10072 , Vietnam
| | - Manh Cuong Nguyen
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology , 18 Hoang Quoc Viet St., Cau Giay Dist. , Hanoi 10072 , Vietnam
| | - Van Chinh Luu
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology , 18 Hoang Quoc Viet St., Cau Giay Dist. , Hanoi 10072 , Vietnam
| | - Minh Quan Pham
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology , 18 Hoang Quoc Viet St., Cau Giay Dist. , Hanoi 10072 , Vietnam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology , Hanoi 10072 , Vietnam
| | - Thi Huyen Vu
- Faculty of Environment, Vietnam National University of Agriculture , Hanoi , Vietnam
| | - Tri Nhut Pham
- Center of Excellence for Biochemistry and Natural Products, Nguyen Tat Thanh University , Ho Chi Minh City , Vietnam
- NTT Hi-Tech Institute, Nguyen Tat Thanh University , Ho Chi Minh City , Vietnam
| | - Dung Thuy Nguyen Pham
- Center of Excellence for Biochemistry and Natural Products, Nguyen Tat Thanh University , Ho Chi Minh City , Vietnam
- NTT Hi-Tech Institute, Nguyen Tat Thanh University , Ho Chi Minh City , Vietnam
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Doan DT, Luu DP, Nguyen TD, Hoang Thi B, Pham Thi HM, Do HN, Luu VH, Pham TD, Than VT, Pham Thi HH, Pham MQ, Tran QT. Isolation of Penicillium citrinum from Roots of Clerodendron cyrtophyllum and Application in Biosynthesis of Aglycone Isoflavones from Soybean Waste Fermentation. Foods 2019; 8:foods8110554. [PMID: 31698736 PMCID: PMC6915340 DOI: 10.3390/foods8110554] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 10/24/2019] [Accepted: 10/28/2019] [Indexed: 11/16/2022] Open
Abstract
Soybeans offer an abundant source of isoflavones, which confer useful bioactivities when existing in aglycone forms. The conversion of isoflavones into aglycones via fermentation of soybean products is often realized by β-glucosidase, an enzyme produced by fungi. In this study, a filamentous fungus, Clerodendron cyrtophyllum, was isolated from root of Clerodendron cyrtophyllum Turcz, which was able to produce the highest activity of β-glucosidase up to 33.72 U/mL at 144 h during fermentation on Potato Dextrose Broth (PDB). The obtained fungus was grown on isoflavones-rich soybean extract to produce genistein and daidzein, achieving the conversion rate of 98.7%. Genistein and daidzein were isolated and purified by column chromatography using hexane/acetone (29:1/1:1), reaching purities of over 90% of total isoflavones, as identified and determined by TLC, LC-MS/MS, and 1H and 13C NMR spectroscopy. These results imply that the isolated P. citrinum is a potential fungal strain for industrial-scale production of genistein and daidzein from isoflavones-containing soybean extracts. These products may serve as potential raw materials for manufacture of functional foods that are based on aglycones.
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Affiliation(s)
- Duy Tien Doan
- Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi 10072, Vietnam; (D.T.D.); (D.P.L.); (T.D.N.)
| | - Duc Phuong Luu
- Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi 10072, Vietnam; (D.T.D.); (D.P.L.); (T.D.N.)
| | - Thanh Duong Nguyen
- Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi 10072, Vietnam; (D.T.D.); (D.P.L.); (T.D.N.)
| | - Bich Hoang Thi
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology,18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi 10072, Vietnam; (B.H.T.); (H.M.P.T.); (H.N.D.); (T.D.P.); (M.Q.P.)
| | - Hong Minh Pham Thi
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology,18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi 10072, Vietnam; (B.H.T.); (H.M.P.T.); (H.N.D.); (T.D.P.); (M.Q.P.)
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi 10072, Vietnam
| | - Huu Nghi Do
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology,18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi 10072, Vietnam; (B.H.T.); (H.M.P.T.); (H.N.D.); (T.D.P.); (M.Q.P.)
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi 10072, Vietnam
| | - Van Huyen Luu
- Hanoi University of Natural Resources and Environment, Hanoi 10072, Vietnam;
| | - The Dan Pham
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology,18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi 10072, Vietnam; (B.H.T.); (H.M.P.T.); (H.N.D.); (T.D.P.); (M.Q.P.)
- Vietnam Academy of Science and Technology, University of Science and Technology of Hanoi, Hanoi 10072, Vietnam
| | - Van Thai Than
- NTT Institute of High Technology, Nguyen Tat Thanh University, Ho Chi Minh City 700000, Vietnam;
| | - Hai Ha Pham Thi
- Faculty of Biotechnology, Nguyen Tat Thanh University, Ho Chi Minh City 700000, Vietnam
- Correspondence: (H.H.P.T.); (Q.T.T.)
| | - Minh Quan Pham
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology,18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi 10072, Vietnam; (B.H.T.); (H.M.P.T.); (H.N.D.); (T.D.P.); (M.Q.P.)
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi 10072, Vietnam
| | - Quoc Toan Tran
- Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology,18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi 10072, Vietnam; (B.H.T.); (H.M.P.T.); (H.N.D.); (T.D.P.); (M.Q.P.)
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi 10072, Vietnam
- Correspondence: (H.H.P.T.); (Q.T.T.)
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Abstract
Chronic Lymphocytic Leukemia (CLL) is the most prevalent form of leukemia in Western countries, and is characterized by a monoclonal proliferation of primarily immature CD5+ B lymphocytes. The molecular biology of chronic leukemias and lymphomas remains largely unresolved. Surface immunoglobulin (Ig) expression, which is often decreased in CLL, requires the protein product of the B29 gene for translocation of the B cell antigen receptor complex (BCR) to the cell surface and for signal transduction. Because B29 is essential for intracellular assembly and transport of the B cell antigen receptor complex to the cell surface, we postulate that a perturbation in B29 could result in the diminished expression and function of surface Ig in leukemic CLL cells. We have found recurrent aberrations affecting the B29 gene in CLL cells. Analyses of 27 unselected cases of CLL demonstrate that over 75% had low to absent B29 expression which correlated directly to their level of surface Ig expression. Half of these surface B29(low/-) cases had either no or barely detectable levels of B29 mRNA by RNAse protection assay. To date, all of the CLL samples with normal B29 mRNA levels have been found to have point mutations or truncations which would significantly effect the structure and/or function of B29 protein. Strategies directed at correcting these B29 mutations are expected to induce increased Ig surface expression in CLL and may improve the sensitivity of CLL cells to conventional cytotoxic chemotherapy.
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MESH Headings
- Aged
- Aged, 80 and over
- Antigens, CD/biosynthesis
- Antigens, CD/genetics
- CD79 Antigens
- Female
- Gene Expression Regulation, Neoplastic/immunology
- Humans
- Immunophenotyping
- Leukemia, Lymphocytic, Chronic, B-Cell/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/immunology
- Male
- Middle Aged
- Mutation/immunology
- RNA, Messenger/analysis
- RNA, Neoplasm/analysis
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Affiliation(s)
- A A Thompson
- Dept. of Pediatrics, UCLA School of Medicine, Los Angeles, CA 90095, USA
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Thompson AA, Talley JA, Do HN, Kagan HL, Kunkel L, Berenson J, Cooper MD, Saxon A, Wall R. Aberrations of the B-cell receptor B29 (CD79b) gene in chronic lymphocytic leukemia. Blood 1997; 90:1387-94. [PMID: 9269755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Leukemic B cells in chronic lymphocytic leukemia (B-CLL) typically exhibit low or undetectable surface Ig. Because the B29 (CD79b and Ig beta) and mb-1 (CD79a and Ig alpha) gene products are required for surface Ig display in the B-cell receptor complex (BCR), we analyzed the expression of these genes in B-CLL cells. The majority (83%) of the randomly selected B-CLL patient samples analyzed exhibited low or undetectable surface BCR measured by mu heavy chain and B29 expression. Levels of mb-1 mRNA in these B-CLL samples with low surface BCR were similar to those in normal B cells. Among those with decreased surface expression, B29 mRNA was not detected in half of these B-CLL samples. The remaining B-CLL samples with diminished surface BCR contained normal levels of B29 mRNA. Further analysis of cDNA clones from the majority of these latter samples contained point mutations, insertions, or deletions that were largely located in the B29 transmembrane and cytoplasmic domains. These results indicate the occurrence of somatic mutations predicted to affect B29 expression and/or function in the majority of B-CLL and suggest that these aberrations underlie the diminished surface BCR display and loss of BCR signaling characteristic of this leukemia.
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MESH Headings
- Antigens, CD/analysis
- Antigens, CD/genetics
- B-Lymphocytes/immunology
- CD79 Antigens
- Cell Separation
- Chromosome Aberrations
- Cloning, Molecular
- Flow Cytometry
- Humans
- Immunoglobulin mu-Chains/analysis
- Leukemia, Lymphocytic, Chronic, B-Cell/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/immunology
- Mutation
- RNA, Messenger/analysis
- Receptors, Antigen, B-Cell/analysis
- Receptors, Antigen, B-Cell/genetics
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Affiliation(s)
- A A Thompson
- Department of Pediatrics, UCLA School of Medicine and The Molecular Biology Institute, UCLA, Los Angeles, CA 90095, USA
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Abstract
In a screen designed to isolate human cDNAs that complement a yeast G2 phase checkpoint mutation (mec1), we isolated a cDNA homologous to the Saccharomyces cerevisiae CDC34 gene. The human CDC34 cDNA can functionally substitute for the yeast CDC34 gene and represents a mammalian homolog of the group of yeast genes required for the late G1-->S phase transition. The human CDC34 gene is expressed in multiple cell lines as a unique species and Southern blot analysis reveals evidence for a single gene that is highly conserved in higher eukaryotes. The human gene is located on the far telomeric region of 19p13.3 in a location that defines a region of homology between human chromosome 19p and mouse chromosome 11.
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Affiliation(s)
- S E Plon
- Fred Hutchinson Cancer Research Center, Seattle, WA 98104
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