1
|
Kwon YR, Kim HJ, Sohn MJ, Lim JY, Park KS, Lee S, Chung NG, Jeong DC, Min CK, Kim YJ. Effects of decitabine on allogeneic immune reactions of donor lymphocyte infusion via activation of dendritic cells. Exp Hematol Oncol 2020; 9:22. [PMID: 32908796 PMCID: PMC7470611 DOI: 10.1186/s40164-020-00178-y] [Citation(s) in RCA: 8] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Accepted: 08/21/2020] [Indexed: 11/15/2022] Open
Abstract
Background Successful prevention of post-transplantation relapse after donor lymphocyte infusion (DLI) depends on its capability to mediate an effective graft-versus-leukemia (GVL) response while minimizing DLI-related toxicity, including graft-versus-host disease (GVHD). Methods We assessed the effects of decitabine (DEC), a hypomethylating agent, upon allogeneic immune reaction in a murine model of DLI. Results Significantly greater tumor growth retardation and survival prolongation occurred in mice administered with 1.0 mg/kg DEC for 5 days (DEC-1.0) than in control or DEC-0.1 mice. Upon prompt DEC and DLI co-administration, dendritic cells (DCs) were activated; DEC-1.0/DLI induced severe GVHD, and survival was significantly lower than with DLI alone or DEC-0.1/DLI treatments. IFN-γ and CD28 levels were higher in splenic DCs of DEC-1.0 mice than in those of control mice. Assessment of delayed DLI co-administration with DEC, when IFN-γ levels were normalized to control levels, revealed that DEC-1.0/DLI successfully facilitated tumor management without causing severe GVHD. Conclusions Our results suggest that DEC primes allogeneic immune reactions of DLI via DC activation, and GVHD and GVL effects are separable through optimal DLI timing based on DEC-induced increase in IFN-γ expression levels.
Collapse
Affiliation(s)
- Yong-Rim Kwon
- Laboratory of Hematological Disease and Immunology, Seoul, Republic of Korea
| | - Hye Joung Kim
- Laboratory of Hematological Disease and Immunology, Seoul, Republic of Korea
| | - Min-Jung Sohn
- Laboratory of Hematological Disease and Immunology, Seoul, Republic of Korea
| | - Ji-Young Lim
- Laboratory of Hematological Disease and Immunology, Seoul, Republic of Korea
| | - Kyung-Shin Park
- Department of Clinical Pathology, Seoul St. Mary's Hospital, Seoul, Republic of Korea
| | - Seok Lee
- Laboratory of Hematological Disease and Immunology, Seoul, Republic of Korea.,Leukemia Research Institute, Seoul, Republic of Korea.,Seoul St. Mary's Hematology Hospital, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul, 06591 Republic of Korea
| | - Nack-Gyun Chung
- Leukemia Research Institute, Seoul, Republic of Korea.,Seoul St. Mary's Hematology Hospital, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul, 06591 Republic of Korea.,Department of Pediatrics, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Dae-Chul Jeong
- Department of Pediatrics, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Chang-Ki Min
- Laboratory of Hematological Disease and Immunology, Seoul, Republic of Korea.,Leukemia Research Institute, Seoul, Republic of Korea.,Seoul St. Mary's Hematology Hospital, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul, 06591 Republic of Korea
| | - Yoo-Jin Kim
- Laboratory of Hematological Disease and Immunology, Seoul, Republic of Korea.,Leukemia Research Institute, Seoul, Republic of Korea.,Seoul St. Mary's Hematology Hospital, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul, 06591 Republic of Korea
| |
Collapse
|
2
|
Han BS, Kim KS, Kim YJ, Van Minh N, Jung HY, Sohn MJ, Kim Won G. Nurr1-Activating Daphnane Diterpenes from Daphne genkwa and its Neuroprotective Effect in an Animal Model of Parkinson's Disease. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- BS Han
- Functional Genomics Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea, Republic of (South)
| | - KS Kim
- Laboratory Animal Resource Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea, Republic of (South)
| | - YJ Kim
- Superbacteria Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea, Republic of (South)
| | - N Van Minh
- Superbacteria Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea, Republic of (South)
| | - HY Jung
- Functional Genomics Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea, Republic of (South)
| | - MJ Sohn
- Superbacteria Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea, Republic of (South)
| | - G Kim Won
- Superbacteria Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea, Republic of (South)
| |
Collapse
|
3
|
Ubiyvovk VM, Blazhenko OV, Zimmermann M, Sohn MJ, Kang HA. Cloning and functional analysis of the GSH1/MET1 gene complementing cysteine and glutathione auxotrophy of the methylotrophic yeast Hansenula polymorpha. Ukr Biokhim Zh (1999) 2011; 83:67-81. [PMID: 22276430] [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: 05/31/2023]
Abstract
The Hansenula polymorpha GSH1/MET1 gene was cloned by complementation of glutathione-dependent growth of H. polymorpha gsh1 mutant isolated previously as N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) resistant and cadmium ion sensitive clone. The H. polymorpha GSH1 gene was capable of restoring cadmium ion resistance, MNNG sensitivity, normal glutathione level and cell proliferation on minimal media without addition of cysteine or glutathione, when introduced into the gsh1 mutant cells. It was shown that the H. polymorpha GSH1 gene has homology to the Saccharomyces cerevisiae MET1 gene encoding S-adenosyl-L-methionine uroporphyrinogen III transmethylase, responsible for the biosynthesis of sulfite reductase cofactor, sirohaem. The H. polymorpha GSH1/MET1 gene deletion cassette (Hpgsh1/met1::ScLEU2) was constructed and corresponding null mutants were isolated. Crossing data of the point gsh1 and null gsh1/met1 mutants demonstrated that both alleles were located to the same gene. The null gsh1/met1 mutant showed total growth restoration on minimal media supplemented with cysteine or glutathione as a sole sulfur source, but not with inorganic (sulfate, sulfite) or organic (methionine, S-adenosylmethionine) sources of sulfur. Moreover, both the point gsh1 and null gsh1/met1 mutants displayed increased sensitivity to the toxic carbon substrate methanol, formaldehyde, organic peroxide and cadmium ions.
Collapse
Affiliation(s)
- V M Ubiyvovk
- Institute of Cell Biology, National Academy of Sciences of Ukraine, Lviv
| | | | | | | | | |
Collapse
|
4
|
Lee YI, Kim SO, Kwon HJ, Park JG, Sohn MJ, Jeong SS. Phosphorylation of purified recombinant hepatitis B virus-X protein by mitogen-activated protein kinase and protein kinase C in vitro. J Virol Methods 2001; 95:1-10. [PMID: 11377708 DOI: 10.1016/s0166-0934(00)00282-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The recombinant human hepatitis B virus-X protein (rhHBx) has been expressed as inclusion bodies in Escherichia coli and purified. By sequential dialysis of urea, rhHBx was folded into the native structure, which was demonstrated by both the efficacy of its transcriptional activation of the adenovirus major late promoter, fluorescence and circular dichroism (CD) analysis. The increase in CD values at 220 nm and a corresponding blue shift of the intrinsic fluorescence emission confirmed the ability of HBx to refold in lower concentrations of urea to produce the active protein. After purification and renaturation, the rhHBx protein was found to be phosphorylated by protein kinase C (PKC) and mitogen-activated protein kinase (MAPK). In vivo phosphorylation of HBx was also demonstrated. Although PKC and MAPK enhance the HBx phosphorylation in vitro, neither protein kinase A nor caseine kinase II (CKII) phosphorylate HBx protein, though there are possible substrate residues of both kinases in HBx protein. Phosphoamino acid analysis of the total acid hydrolyzed HBx showed that serine residues can be phosphorylated by PKC or MAPK.
Collapse
Affiliation(s)
- Y I Lee
- Liver Cell Signal Transduction Research Unit, Bioscience Research Division, Korea Research Institute of Bioscience and Biotechnology, 305-606, Taejon, South Korea.
| | | | | | | | | | | |
Collapse
|
5
|
Sohn MJ, Park HC, Park HS, Kim JJ, Kim EY. Anterior cervical corpectomy and fusion using miniplate and screws in a 7-year-old child with eosinophilic granuloma of the cervical spine. Spine (Phila Pa 1976) 2001; 26:1193-6. [PMID: 11413437 DOI: 10.1097/00007632-200105150-00023] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN This is a case report of a 7-year-old child with eosinophilic granuloma in the cervical spine, which underwent anterior cervical corpectomy and fusion by using Miniplate and screws. OBJECTIVES To describe the use of Miniplate and screws for pediatric cervical anterior fusion. SUMMARY OF BACKGROUND DATA Eosinophilic granuloma is a rare disease causing destructive bony lesions of the cervical spine in children. A complete resection and fusion were considered to be the preferable treatment in our case. However, cervical spinal fusion and instrumentation in children may be technically difficult because of the size of the vertebral body and the iliac bone. In addition, a proper device for an internal fixation in pediatric patients is not yet available. METHODS A case of eosinophilic granuloma in pediatric spine was presented. RESULTS We confirmed successful bony fusion and the restoration of the normal cervical curvature without recurrence of the tumor 2 years after the procedure. CONCLUSIONS For proper internal fixation and prevention of dislodgement of the grafted bone, we used the Miniplate and screws as internal fixator after intralesional resection of the tumor mass.
Collapse
Affiliation(s)
- M J Sohn
- Department of Neurosurgery, Inha University Medical Center, Inchon, Korea
| | | | | | | | | |
Collapse
|
6
|
Park JW, Moon SH, Yeom JS, Lim KJ, Sohn MJ, Jung WC, Cho YJ, Jeon KW, Ju W, Ki CS, Oh MD, Choe K. Naturally acquired antibody responses to the C-terminal region of merozoite surface protein 1 of Plasmodium vivax in Korea. Clin Diagn Lab Immunol 2001; 8:14-20. [PMID: 11139190 PMCID: PMC96005 DOI: 10.1128/cdli.8.1.14-20.2001] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We expressed a protein in Saccharomyces cerevisiae in order to evaluate the humoral immune responses to the C-terminal region of the merozoite surface protein 1 of Plasmodium vivax. This protein (Pv200(18)) had a molecular mass of 18 kDa and was reactive with the sera of individuals with patent vivax malaria on immunoblotting analysis. The levels of immunoglobulin M (IgM) and IgG antibodies against Pv200(18) were measured in 421 patients with vivax malaria (patient group), 528 healthy individuals from areas of nonendemicity (control group 1), and 470 healthy individuals from areas of endemicity (control group 2), using the indirect enzyme-linked immunosorbent assay (ELISA) method. To study the longevity of the antibodies, 20 subjects from the patient group were also tested for the antibody levels once a month for 1 year. When the cutoff values for seropositivity were determined as the mean + 3 x standard deviation of the antibody levels in control group 1, both IgG and IgM antibody levels were negative in 98.5% (465 of 472) of control group 2. The IgG and IgM antibodies were positive in 88.1% (371 of 421) and 94.5% (398 of 421) of the patient group, respectively. The IgM antibody became negative 2 to 4 months after the onset of symptoms, whereas the IgG antibody usually remained positive for more than 5 months. In conclusion, indirect ELISA using Pv200(18) expressed in S. cerevisiae may be a useful diagnostic method for vivax malaria.
Collapse
Affiliation(s)
- J W Park
- Korean Armed Forces Central Medical Research Institute, Yusong-gu, Daejeon, Chongno-gu, Seoul 110-744, Republic of Korea
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Baltsavias GS, Byrne JV, Halsey J, Coley SC, Sohn MJ, Molyneux AJ. Effects of timing of coil embolization after aneurysmal subarachnoid hemorrhage on procedural morbidity and outcomes. Neurosurgery 2000; 47:1320-9; discussion 1329-31. [PMID: 11126903] [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: 02/18/2023] Open
Abstract
OBJECTIVE To elucidate the effect of treatment timing on procedural clinical outcomes after aneurysmal subarachnoid hemorrhage (SAH) for patients treated by endosaccular coil embolization. METHODS A group of 327 patients who were consecutively treated, during a 46-month period, for ruptured intracranial aneurysms by coil embolization within 30 days after SAH were evaluated. Outcomes were assessed by comparing immediate pretreatment World Federation of Neurological Surgeons (WFNS) grades, 72-hour posttreatment WFNS grades, and modified Glasgow Outcome Scale scores at 6 months for patients treated within 48 hours (Group 1), 3 to 10 days (Group 2), or 11 to 30 days (Group 3) after SAH. RESULTS The three interval-to-treatment groups included 33, 38, and 29% of the patients, respectively. Before treatment, 70% of the patients in Group 1, 78% of those in Group 2, and 83% of those in Group 3 were in good clinical grades (i.e., WFNS Grade 1 or 2). After coil embolization, the WFNS grades were either unchanged or improved for 93.5% of the patients in Group 1, 89.5% of those in Group 2, and 91.5% of those in Group 3. After 6 months, 81.3% of the patients in Group 1 experienced good outcomes (modified Glasgow Outcome Scale scores of 1 or 2), as did 84% of those in Group 2 and 80% of those in Group 3. No statistical difference was demonstrated between the three groups when they were compared for these two variables. CONCLUSION The interval between endovascular treatment and SAH did not affect periprocedural morbidity rates or 6-month outcomes. Coil embolization should therefore be performed as early as possible after aneurysmal SAH, to prevent aneurysmal rerupture.
Collapse
Affiliation(s)
- G S Baltsavias
- Department of Radiology, Radcliffe Infirmary National Health Service Trust, Oxford, England
| | | | | | | | | | | |
Collapse
|
8
|
Abstract
We describe the development and design of a database for auditing patients with intracranial aneurysms and their endovascular treatment. The database has been used since 1992. Our department's version now contains records of over 800 patients and well over 1,000 aneurysms. The advantages of a relational database for this type of audit are discussed. Copies of the software can be obtained free of charge from the authors.
Collapse
Affiliation(s)
- M J Sohn
- Department of Neuroradiology, University of Oxford, Radcliffe Infirmary, UK
| | | |
Collapse
|
9
|
Abstract
Clear cell meningioma, about 20 cases of which have been reported in the literature, is a morphological variant of meningioma. The authors report a case of spinal clear cell meningioma that occurred in a child. A 14-month-old girl showed gradually progressive paraparesis 1 month after she started to walk. Magnetic resonance image showed an intradural extramedullary mass compressing the conus medullaris and cauda equina. Complete excision of the tumor was done, and the patient gradually recovered from motor weakness and neurogenic bladder. Histological examinations along with immunohistochemical and ultrastructural investigations allowed a diagnosis of clear cell meningioma. During the follow-up period, a recurrent mass lesion was detected on the 8-month follow-up MR image in the same region. Because clear cell meningioma might be biologically aggressive, postoperative adjuvant therapy and close follow-up investigation should be considered.
Collapse
Affiliation(s)
- H C Park
- Department of Neurosurgery, Inha University Medical Center, Choong-gu, Inchon, Korea.
| | | | | | | | | |
Collapse
|
10
|
Abstract
OBJECTIVE To evaluate the usefulness of MR imaging for diseases of the small intestine, emphasizing a comparison with CT. MATERIALS AND METHODS Thirty-four patients who underwent both CT and MR imaging using FLASH 2D and HASTE sequences were analyzed. All patients had various small bowel diseases with variable association of peritoneal lesions. We compared the detectabilities of CT and MR imaging using different MR pulse sequences. The capability for analyzing the characteristics of small intestinal disease was also compared. RESULTS MR imaging was nearly equal to CT for detecting intraluminal or peritoneal masses, lesions in the bowel and mesentery, and small bowel obstruction, but was definitely inferior for detecting omental lesions. The most successful MR imaging sequence was HASTE for demonstrating bowel wall thickening, coronal FLASH 2D for mesenteric lesions, and axial FLASH 2D for omental lesions. MR imaging yielded greater information than CT in six of 12 inflammatory bowel diseases, while it was equal to CT in six of seven neoplasms and inferior in five of seven mesenteric ischemia. In determining the primary causes of 15 intestinal obstructions, MR imaging was correct in 11 (73%) and CT in nine (60%) patients. CONCLUSION MR imaging can serve as an alternative diagnostic tool for patients with suspected inflammatory bowel disease, small intestinal neoplasm or obstruction.
Collapse
Affiliation(s)
- J H Kim
- Department of Diagnostic Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Byrne JV, Sohn MJ, Molyneux AJ, Chir B. Five-year experience in using coil embolization for ruptured intracranial aneurysms: outcomes and incidence of late rebleeding. J Neurosurg 1999; 90:656-63. [PMID: 10193610 DOI: 10.3171/jns.1999.90.4.0656] [Citation(s) in RCA: 352] [Impact Index Per Article: 14.1] [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: 11/06/2022]
Abstract
OBJECT During a 5-year period 317 patients presenting with aneurysmal subarachnoid hemorrhage were successfully treated by coil embolization within 30 days of hemorrhage. The authors followed patients to assess the stability of aneurysm occlusion and its longer-term efficacy in protecting patients against rebleeding. METHODS Patients were followed for 6 to 65 months (median 22.3 months) by clinical review, angiography performed at 6 months posttreatment, and annual questionnaires. Stable angiographic occlusion was evident in 86.4% of small and 85.2% of large aneurysms with recurrent filling in 38 (14.7%) of 259 aneurysms. Rebleeding was caused by aneurysm recurrence in four patients (between 11 and 35 months posttreatment) and by rupture of a coincidental untreated aneurysm in one patient. Annual rebleeding rates were 0.8% in the 1st year, 0.6% in the 2nd year, and 2.4% in the 3rd year after aneurysm embolization, with no rebleeding in subsequent years. Rebleeding occurred in three (7.9%) of 38 recurrent aneurysms and in one (0.4%) of 221 aneurysms that appeared stable on angiography. CONCLUSIONS Periodic follow-up angiography after coil embolization is recommended to identify aneurysm recurrence and those patients at a high risk of late rebleeding.
Collapse
Affiliation(s)
- J V Byrne
- University Department of Radiology, The Radcliffe Infirmary National Health Service Trust, Oxford, England, United Kingdom.
| | | | | | | |
Collapse
|
12
|
Sohn MJ, Lee ME, Park HS, Nham SU, Lee YI. Overexpression and purification of human immunodeficiency virus type 1 env derived epitopes in Escherichia coli. J Biotechnol 1996; 45:211-6. [PMID: 8721306 DOI: 10.1016/0168-1656(95)00169-7] [Citation(s) in RCA: 8] [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: 02/01/2023]
Abstract
In order to develop a reliable and inexpensive serodiagnostic method, a part of envelope gene of HIV-1, gp120' and gp41' (HIV-1 env a.a. 295-474 and a.a. 556-647) was cloned into a T7 expression vector (pET3d). The fusion protein (gp120'-gp41') was overexpressed in Escherichia coli, then purified to homogeneity by a simple gel filtration chromatography. Western blot analysis and enzyme-linked immunosorbent assay (ELISA) using the purified fusion protein showed a high sensitivity and a specificity for the detection of anti HIV-1 antibodies in testing human plasma. These results suggest that the expression scheme employing a direct expression vector and the rapid purification method are reliable and applicable for obtaining a large quantity of HIV-1 env protein for diagnoses of HIV-1 infections.
Collapse
Affiliation(s)
- M J Sohn
- Molecular Biomedicine Research Group, Korea Research Institute of Bioscience and Biotechnology, Daejun, South Korea
| | | | | | | | | |
Collapse
|
13
|
Sohn MJ, Chong YH, Chang JE, Lee YI. Overexpression and simple purification of human immunodeficiency virus-1 gag epitope derived from a recombinant antigen in E. coli and its use in ELISA. J Biotechnol 1994; 34:149-55. [PMID: 7764847 DOI: 10.1016/0168-1656(94)90084-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
To develop a test for diagnosis of human immunodeficiency virus-1 (HIV-1) exposure sensitivity, a part of the gag gene was cloned and expressed in Escherichia coli, using expression vectors containing a trp promoter. The immunoreactivity of recombinant protein was determined using HIV-1 specific antibodies in a Western blot analysis. The recombinant plasmid, pYHCgag3, gag gene was fused to the trpE' gene linked to the hydroxylamine (HA) cleavage recognition sequence which was induced to overexpress a core antigen (gag a.a. 121-398 from plasmid BH10) as fusion protein in the form of insoluble inclusion body. Recombinant gag was purified by a simple single step purification procedure. After partial purification of inclusion bodies and subject to the HA-cleavage treatment, gag protein was further purified to homogeneity using DEAE-Sepharose chromatography. The purified core antigen offered reliable results with high sensitivity and specificity for identification of HIV-1 antibodies when tested in the enzyme-linked immunosorbent assay (ELISA). These results suggest that mass production of recombinant core antigen will provide a valuable resource to HIV-1 serodiagnostics for the screening of large groups of blood donors to prevent HIV-1 infection.
Collapse
Affiliation(s)
- M J Sohn
- Molecular Genetics Lab, Korea Institute of Science and Technology, Taejon, South Korea
| | | | | | | |
Collapse
|
14
|
Abstract
In order to develop a reliable and inexpensive serodiagnostic method, part of the transmembrane glycoprotein gene of HIV-1, gp41', (HIV-env 548-646) was cloned into an expression vector, pCT10 with a sequence encoding a hydroxylamine cleavage site and with a part of Lac Z gene (Lac 2": 834 base pairs) as a fusion partner. Overexpression of Lac Z"-gp41' was induced in E. coli and the gp41' fusion protein was purified to homogeneity by centrifugation, hydroxylamine cleavage and an ion-exchange chromatography. Western blot analysis and enzyme-linked immunosorbant assay (ELISA) using the purified gp41 fragment showed high sensitivity and specificity of gp41 as an antigen to detect anti HIV-1 antibodies in testing human sera. These results suggest that this simple and rapid purification method is reliable for obtaining a large quantity of purified gp41'.
Collapse
Affiliation(s)
- M J Sohn
- Laboratory of Molecular Genetics, Korea Institute of Science and Technology, Daejun
| | | | | | | | | | | |
Collapse
|