1
|
Renman E, Ekici R, Sundström M, Lejon K. HSC70 is a novel binding partner involved in the capture of immunoglobulins on B cells in the NOD mouse. Autoimmunity 2022; 55:520-528. [PMID: 36120986 DOI: 10.1080/08916934.2022.2117307] [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] [Indexed: 11/02/2022]
Abstract
B cells have been shown to be essential for Type 1 diabetes development in the non-obese diabetic mouse, where their contribution as antigen presenting cells has been emphasised. Other important functions for B cells include surface capture of immunoglobulins and transportation of immune complexes, with subsequent endocytosis, antigen processing and antigen presentation. We have previously demonstrated that NOD B cells capture IgM and IgG immune complexes through an unknown surface molecule. In this study, we revealed the presumptive immunoglobulin-binding molecule to be HSC70. Moreover, we detected increased levels of HSC70 on NOD B cells. HSC70 has been shown to play a role in antigen processing and presentation as well as being important in several autoimmune diseases, including rheumatoid arthritis and systemic lupus erythematosus. Due to its protein stabilising properties, increased HSC70 could contribute to enhanced self-antigen collection and presentation and thereby contribute to the development of Type 1 diabetes.
Collapse
Affiliation(s)
- Emma Renman
- Department of Clinical Microbiology Umeå, Umeå University, Umeå, Sweden
| | - Rifat Ekici
- Department of Clinical Microbiology Umeå, Umeå University, Umeå, Sweden
| | - Mia Sundström
- Department of Clinical Microbiology Umeå, Umeå University, Umeå, Sweden
| | - Kristina Lejon
- Department of Clinical Microbiology Umeå, Umeå University, Umeå, Sweden
| |
Collapse
|
2
|
La Fleur L, Falk-Sörqvist E, Smeds P, Mattsson J, Sundström M, Branden E, Koyi H, Isaksson J, Brunnström H, Nilsson M, Micke P, Moens L, Botling J. P2.02-015 Mutation Patterns in a Swedish Non-Small Cell Lung Cancer Cohort. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
3
|
Sundström M, Edberg A, Rämgård M, Blomqvist K. HEALTH CARE STAFF’S PERCEPTION OF EXISTENTIAL LONELINESS AMONG OLDER PEOPLE. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.4057] [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: 11/12/2022] Open
Affiliation(s)
- M. Sundström
- Health and Society, Kristianstad University, Kristianstad, Sweden,
- Malmö University, Malmö, Sweden
| | - A. Edberg
- Health and Society, Kristianstad University, Kristianstad, Sweden,
| | | | - K. Blomqvist
- Health and Society, Kristianstad University, Kristianstad, Sweden,
| |
Collapse
|
4
|
Ghanipour L, Jirström K, Sundström M, Glimelius B, Birgisson H. Associations of defect mismatch repair genes with prognosis and heredity in sporadic colorectal cancer. Eur J Surg Oncol 2016; 43:311-321. [PMID: 27836416 DOI: 10.1016/j.ejso.2016.10.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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: 05/12/2016] [Revised: 09/09/2016] [Accepted: 10/13/2016] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Microsatellite instability arises due to defect mismatch repair (MMR) and occurs in 10-20% of sporadic colorectal cancer. The purpose was to investigate correlations between defect MMR, prognosis and heredity for colorectal cancer in first-degree relatives. MATERIAL AND METHODS Tumour tissues from 318 patients consecutively operated for colorectal cancer were analysed for immunohistochemical expression of MLH1, MSH2 and MSH6 on tissue microarrays. Information on KRAS and BRAF mutation status was available for selected cases. RESULTS Forty-seven (15%) tumours displayed MSI. No correlation was seen between patients exhibiting MSI in the tumour and heredity (p = 0.789). Patients with proximal colon cancer and MSI had an improved cancer-specific survival (p = 0.006) and prolonged time to recurrence (p = 0.037). In a multivariate analysis including MSI status, gender, CEA, vascular and neural invasion, patients with MSS and proximal colon cancer had an impaired cancer-specific survival compared with patients with MSI (HR, 4.32; CI, 1.46-12.78). The same prognostic information was also seen in distal colon cancer; no recurrences seen in the eight patients with stages II and III distal colon cancer and MSI, but the difference was not statistically significant. CONCLUSION No correlation between MSI and heredity for colorectal cancer in first-degree relatives was seen. Patients with MSI tumours had improved survival.
Collapse
Affiliation(s)
- L Ghanipour
- Department of Surgical Science, University of Uppsala, Uppsala, Sweden.
| | - K Jirström
- Division of Oncology-Pathology, Department of Clinical Sciences, Lund University, Lund, Sweden
| | - M Sundström
- Department of Immunology, Genetics and Pathology, Molecular and Morphological Pathology, University of Uppsala, Uppsala, Sweden
| | - B Glimelius
- Department of Radiology, Oncology and Radiation Science, University of Uppsala, Uppsala, Sweden
| | - H Birgisson
- Department of Surgical Science, University of Uppsala, Uppsala, Sweden
| |
Collapse
|
5
|
Banday VS, Thyagarajan R, Sundström M, Lejon K. Increased expression of TACI on NOD B cells results in germinal centre reaction anomalies, enhanced plasma cell differentiation and immunoglobulin production. Immunology 2016; 149:297-305. [PMID: 27444337 DOI: 10.1111/imm.12651] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 05/02/2016] [Revised: 06/22/2016] [Accepted: 07/13/2016] [Indexed: 12/18/2022] Open
Abstract
B cells have an important pathogenic role in the development of type 1 diabetes in the non-obese diabetic (NOD) mouse. We have previously reported that NOD mice display an increased percentage of TACIhigh -expressing B cells compared with C57BL/6 mice and this trait is linked to chromosomes 1 and 8. In this paper the genetic association of the transmembrane activator, calcium modulator and cyclophilin ligand interactor (TACI) trait was confirmed using double congenic NOD.B6C1/Idd22 mice. TACI ligation by a proliferation-inducing ligand (APRIL) has been shown to influence plasma cell differentiation, immunoglobulin production and isotype switch. Hence, the functional consequence of the up-regulation of TACI on NOD B cells was analysed both in vitro and in vivo. NOD B cells stimulated with APRIL showed an enhanced plasma cell differentiation and class switch to IgG and IgA compared with B cells from C57BL/6 mice. Moreover, flow cytometry analyses revealed that germinal centre B cells in NOD failed to down-regulate TACI. Availability of the TACI ligand B-cell activating factor (BAFF) has been shown to be a limiting factor in the germinal centre reaction. In line with this, upon immunization with 4-hydroxy-3-nitrophenylacetyl hapten-conjugated hen egg lysozyme, NOD mice produced higher titres of low-affinity antibodies compared with C57BL/6 mice. This observation was supported by the detection of increased levels of BAFF in NOD germinal centres after immunization compared with C57BL/6 by immunofluorescence. Our results support the hypothesis that increased TACI expression on NOD B cells contributes to the pathogenesis of type 1 diabetes in the NOD mouse.
Collapse
Affiliation(s)
- Viqar S Banday
- Department of Clinical Microbiology, Division of Immunology, Umeå University, Umeå, Sweden
| | - Radha Thyagarajan
- Department of Clinical Microbiology, Division of Immunology, Umeå University, Umeå, Sweden
| | - Mia Sundström
- Department of Clinical Microbiology, Division of Immunology, Umeå University, Umeå, Sweden
| | - Kristina Lejon
- Department of Clinical Microbiology, Division of Immunology, Umeå University, Umeå, Sweden.
| |
Collapse
|
6
|
Aftab O, Sundström Y, Bergqvist F, Kultima K, Gustafsson MG, Larsson R, Sundström M, Ossipova E, Lengqvist J, Jakobsson PJ, Rubin J, Berg L. A8.07 Characterising effects of epigenetic regulation in assays using peripheral blood mononuclear cells from patients with inflammatory diseases. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-209124.160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
7
|
Larsson A, Wangefjord S, Emberger G, Sundström M, Nodin B, Eberhard J, Jirström K. Association and Prognostic Interaction of Podocalyxin Like-Protein with Epidermal Growth Factor Receptor Alterations in Colorectal Cancer: a Cohort Study. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu333.66] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
8
|
Sjöberg V, Hollén E, Pietz G, Magnusson KE, Fälth-Magnusson K, Sundström M, Holmgren Peterson K, Sandström O, Hernell O, Hammarström S, Högberg L, Hammarström ML. Noncontaminated dietary oats may hamper normalization of the intestinal immune status in childhood celiac disease. Clin Transl Gastroenterol 2014; 5:e58. [PMID: 24964993 PMCID: PMC4077043 DOI: 10.1038/ctg.2014.9] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 04/23/2014] [Accepted: 05/01/2014] [Indexed: 12/22/2022] Open
Abstract
OBJECTIVES: Life-long, strict gluten-free diet (GFD) is the only treatment for celiac disease (CD). Because there is still uncertainty regarding the safety of oats for CD patients, the aim was to investigate whether dietary oats influence the immune status of their intestinal mucosa. METHODS: Paired small intestinal biopsies, before and after >11 months on a GFD, were collected from children with CD who were enrolled in a randomized, double-blind intervention trial to either of two diets: standard GFD (GFD-std; n=13) and noncontaminated oat-containing GFD (GFD-oats; n=15). Expression levels of mRNAs for 22 different immune effector molecules and tight junction proteins were determined by quantitative reverse transcriptase (RT)-PCR. RESULTS: The number of mRNAs that remained elevated was higher in the GFD-oats group (P=0.05). In particular, mRNAs for the regulatory T cell (Treg) signature molecules interleukin-10 (IL-10) and transforming growth factor-β1 (TGF-β1), the cytotoxicity-activating natural killer (NK) receptors KLRC2/NKG2C and KLRC3/NKG2E, and the tight junction protein claudin-4 remained elevated. Between the two groups, most significant differences were seen for claudin-4 (P=0.003) and KLRC3/NKG2E (P=0.04). CONCLUSIONS: A substantial fraction of pediatric CD patients seem to not tolerate oats. In these patients, dietary oats influence the immune status of the intestinal mucosa with an mRNA profile suggesting presence of activated cytotoxic lymphocytes and Tregs and a stressed epithelium with affected tight junctions. Assessment of changes in levels of mRNA for claudin-4 and KLC3/NKG2E from onset to after a year on oats containing GFD shows promise to identify these CD patients.
Collapse
Affiliation(s)
- Veronika Sjöberg
- Department of Clinical Microbiology, Immunology, Umeå University, Umeå, Sweden
| | - Elisabet Hollén
- Department of Clinical and Experimental Medicine, Medical Microbiology, Linköping University, Linköping, Sweden
| | - Grzegorz Pietz
- Department of Clinical Microbiology, Immunology, Umeå University, Umeå, Sweden
| | - Karl-Eric Magnusson
- Department of Clinical and Experimental Medicine, Medical Microbiology, Linköping University, Linköping, Sweden
| | - Karin Fälth-Magnusson
- 1] Department of Clinical and Experimental Medicine, Division of Pediatrics, Linköping University, Linköping, Sweden [2] Division of Pediatrics in Linköping, County Council of Östergötland, Linköping, Sweden
| | - Mia Sundström
- Department of Clinical Microbiology, Immunology, Umeå University, Umeå, Sweden
| | - Kajsa Holmgren Peterson
- Department of Clinical and Experimental Medicine, Medical Microbiology, Linköping University, Linköping, Sweden
| | - Olof Sandström
- Department of Clinical Sciences, Pediatrics, Umeå University, Umeå, Sweden
| | - Olle Hernell
- Department of Clinical Sciences, Pediatrics, Umeå University, Umeå, Sweden
| | - Sten Hammarström
- Department of Clinical Microbiology, Immunology, Umeå University, Umeå, Sweden
| | - Lotta Högberg
- 1] Department of Clinical and Experimental Medicine, Division of Pediatrics, Linköping University, Linköping, Sweden [2] Division of Pediatrics in Norrköping, County Council of Östergötland, Norrköping, Sweden
| | | |
Collapse
|
9
|
Sundström M, Pelander A, Ojanperä I. O30: Comparing the performance of HR-TOFMS and immunoassay for urine drug screening. Toxicologie Analytique et Clinique 2014. [DOI: 10.1016/s2352-0078(14)70038-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
10
|
Sundström M, Lejon K. The prolonged and enhanced immune response in the non-obese diabetic mouse is dependent on genes in the Idd1/24, Idd12 and Idd18 regions. J Autoimmun 2010; 35:375-82. [DOI: 10.1016/j.jaut.2010.08.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2010] [Revised: 08/12/2010] [Accepted: 08/13/2010] [Indexed: 10/19/2022]
|
11
|
Cantillana T, Sundström M, Bergman A. Synthesis of 2-(4-chlorophenyl)-2-(4-chloro-3-thiophenol)-1,1-dichloroethene (3-SH-DDE) via Newman-Kwart rearrangement - a precursor for synthesis of radiolabeled and unlabeled alkylsulfonyl-DDEs. Chemosphere 2009; 76:805-810. [PMID: 19447466 DOI: 10.1016/j.chemosphere.2009.04.042] [Citation(s) in RCA: 1] [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] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Revised: 04/14/2009] [Accepted: 04/20/2009] [Indexed: 05/27/2023]
Abstract
For the first time, a pathway for synthesis of 2-(4-chlorophenyl)-2-(4-chloro-3-thiophenol)-1,1-dichloroethene (3-SH-DDE), is presented. The compound is of particular interest as a precursor for synthesis of alkylsulfonyl-DDE containing different alkyl groups to discover structural activity relationships, and to promote synthesis of radiolabeled methylsulfonyl-DDE. 2-Chloro-5-methylphenol was first methylated and further oxidized to the corresponding benzoic acid. The acid was reduced to the corresponding aldehyde (4-chloro-3-methoxy benzaldehyde) via 4-chloro-3-methoxy-benzene methanol. A lead/aluminium bimetal system was used to carry out the reductive addition of tetrachloromethane to 4-chloro-3-methoxy benzaldehyde to obtain 2,2,2-trichloro-1-(4-chloro-3-methoxyphenyl)ethanol, the desired starting material to synthesize the DDT-analogue (2-(4-chlorophenyl)-2-(4-chloro-3-methoxy-phenyl)-1,1,1-trichloroethane). Elimination of hydrochloric acid and removal of the methyl group led to the 3-OH-DDE. The Newman-Kwart rearrangement was applied to convert 3-OH-DDE to 3-SH-DDE via the dimethylcarbamothioate derivative. 3-SH-DDE is then used as a precursor for the radiolabel synthesis. The overall yield to acquire 3-SH-DDE after 11 steps was 3%. The step with the lowest yield was the DDT-analog synthesis with a yield of 30%. All other step had a yield of >50%. 3-SH-DDE was methylated with (14)C-labeled iodomethane and oxidized by hydrogen peroxide to obtain 3-[(14)C]MeSO(2)-DDE in an overall yield of 30%.
Collapse
Affiliation(s)
- T Cantillana
- Department of Environmental Chemistry, Stockholm University, SE-10691 Stockholm, Sweden.
| | | | | |
Collapse
|
12
|
Sundström M, Lejon K. Idd-linked genetic regulation of TACIhigh expressing B cells in NOD mice. J Autoimmun 2007; 29:116-24. [PMID: 17656068 DOI: 10.1016/j.jaut.2007.05.005] [Citation(s) in RCA: 7] [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] [Received: 04/04/2007] [Revised: 05/20/2007] [Accepted: 05/20/2007] [Indexed: 01/25/2023]
Abstract
In NOD mice, B cells play a key role in the initiation of type 1 diabetes pathogenesis. We have identified a novel NOD-specific B cell-related trait, i.e. the increased percentage of TACI(high)-expressing splenic B cells, by comparing NOD mice with non-autoimmune C57BL/6 mice. Using athymic NOD mice, we determined that this trait was T cell independent. We mapped the loci contributing to the increased proportion of TACI(high) expressing splenic B cells and found that the control of TACI expression was strongly linked to chromosome 1, in a region which includes the insulin-dependent diabetes (Idd) 5 loci. Moreover, another locus potentially involved was detected in the vicinity of Idd22 on chromosome 8. Interestingly, when analyzing age-dependent contribution to the obtained LOD scores we observed that the linkage to chromosome 8 was explained solely by mice > or =61 days of age, suggesting a temporal genetic regulation of TACI expression. In addition, analysis of genetic interaction between chromosome 1 and chromosome 8 indicated that the two loci acted in an additive fashion. Our findings corroborate the notion that B cell deviations contribute to type 1 diabetes development, and suggest a temporal regulation of TACI(high) expression, possibly influenced by the ongoing autoimmune process.
Collapse
Affiliation(s)
- Mia Sundström
- Umeå University, Department of Clinical Microbiology, Division of Immunology, SE-901 87 Umeå, Sweden
| | | |
Collapse
|
13
|
|
14
|
Sundström M, Alfredsson J, Olsson N, Nilsson G. Stem cell factor-induced migration of mast cells requires p38 mitogen-activated protein kinase activity. Exp Cell Res 2001; 267:144-51. [PMID: 11412047 DOI: 10.1006/excr.2001.5239] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [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
Stem cell factor (SCF) can be considered a cardinal cytokine in mast cell biology as it affects mast cell differentiation, survival, and migration. The objective of this study was to investigate the role of two mitogen-activated protein (MAP) kinases, extracellular signal-regulated kinase (ERK) and p38, in SCF-induced cell migration. This was examined in mouse mast cells by using PD 098059 and SB203580, which are specific inhibitors of mitogen-induced extracellular kinase (MEK) and p38 MAP kinase, respectively. SCF induced a rapid and transient activation of ERK and p38 in a dose-dependent manner. Inhibition of p38 activity by SB203580 was paralleled with a marked reduction of migration toward SCF, whereas the effect of the MEK inhibitor was less pronounced. This is the first report of a physiological function of SCF-dependent activation of p38. Whether p38-mediated mast cell migration is a possible target for suppression of mast cell hyperplasia remains to be determined.
Collapse
Affiliation(s)
- M Sundström
- Department of Genetics and Pathology, Uppsala University, Uppsala, SE-751 85, Sweden
| | | | | | | |
Collapse
|
15
|
Olsson N, Piek E, Sundström M, ten Dijke P, Nilsson G. Transforming growth factor-beta-mediated mast cell migration depends on mitogen-activated protein kinase activity. Cell Signal 2001; 13:483-90. [PMID: 11516623 DOI: 10.1016/s0898-6568(01)00176-0] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Transforming growth factor-beta (TGF-beta) isoforms regulate numerous cellular functions through binding to receptors with intrinsic serine/threonine kinase activity that transduce the intracellular signals via activation of Smad proteins. In this study, we examined the signalling pathways involved in TGF-beta1-mediated growth inhibition and migration in a human mast cell line, HMC-1. TGF-beta1 evoked optimal migration at 40 fM, whereas maximal growth inhibition was obtained at 400 pM. Protein tyrosine kinase inhibitors completely inhibited TGF-beta1-mediated migration, without affecting the antimitogenic response. Smad2 was phosphorylated upon TGF-beta1 treatment, both in the absence and presence of genistein. The mitogen-induced extracellular kinase (MEK) inhibitor, PD98059, blocked the migratory response without affecting growth inhibition. In contrast, the p38 MAP kinase inhibitor, SB203580, had no significant effect on either migration or growth inhibition. These results indicate that different signalling pathways mediate TGF-beta1-induced migration and growth inhibition in HMC-1 cells, where the migration involves MEK activity.
Collapse
Affiliation(s)
- N Olsson
- Department of Genetics and Pathology, Rudbeck Laboratory, Uppsala University, S-751 85, Uppsala, Sweden
| | | | | | | | | |
Collapse
|
16
|
Norin M, Sundström M. Protein models in drug discovery. Curr Opin Drug Discov Devel 2001; 4:284-90. [PMID: 11560059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
Over the last few years, the utilization of protein structural information in drug discovery research has matured and is today applied throughout the process, ranging from genomics-derived target identification and selection to the final design of suitable drug candidates. An especially powerful methodology has arisen from the clear synergies of the combination of target structural information with combinatorial chemistry. Several structural genomics initiatives have recently been started and are now generating 3-D structures of target molecules at an unprecedented rate that will provide a wealth of novel information that can be utilized for rational drug design.
Collapse
Affiliation(s)
- M Norin
- Department of Structural Chemistry, Pharmacia Inc, Division Biovitrum, SE-11287 Stockholm, Sweden.
| | | |
Collapse
|
17
|
Dalvit C, Pevarello P, Tatò M, Veronesi M, Vulpetti A, Sundström M. Identification of compounds with binding affinity to proteins via magnetization transfer from bulk water. J Biomol NMR 2000; 18:65-8. [PMID: 11061229 DOI: 10.1023/a:1008354229396] [Citation(s) in RCA: 322] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
A powerful screening by NMR methodology (WaterLOGSY), based on transfer of magnetization from bulk water, for the identification of compounds that interact with target biomolecules (proteins, RNA and DNA fragments) is described. The method exploits efficiently the large reservoir of H2O magnetization. The high sensitivity of the technique reduces the amount of biomolecule and ligands needed for the screening, which constitutes an important requirement for high throughput screening by NMR of large libraries of compounds. Application of the method to a compound mixture against the cyclin-dependent kinase 2 (cdk2) protein is presented.
Collapse
Affiliation(s)
- C Dalvit
- Pharmacia, Nerviano (MI), Italy.
| | | | | | | | | | | |
Collapse
|
18
|
Enberg B, Luthman H, Segnestam K, Ritzén EM, Sundström M, Norstedt G. Characterisation of novel missense mutations in the GH receptor gene causing severe growth retardation. Eur J Endocrinol 2000; 143:71-6. [PMID: 10870033 DOI: 10.1530/eje.0.1430071] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Two Swedish brothers, 2.5 and 4 years of age, were found to fulfil all the clinical and laboratory characteristics of Laron's syndrome. They were shown to have unique missense mutations in the GH receptor gene. Both of their parents were of normal height, but they both separately carried one of the identified gene alterations. A molecular model of the first receptor alteration suggests that a collapse in three-dimensional receptor structure most likely contributed to the GH insensitivity in these patients.
Collapse
Affiliation(s)
- B Enberg
- Department of Molecular Medicine, Karolinska Hospital S-171 76 Stockholm, Sweden
| | | | | | | | | | | |
Collapse
|
19
|
Al-Daccak R, Mehindate K, Damdoumi F, Etongué-Mayer P, Nilsson H, Antonsson P, Sundström M, Dohlsten M, Sékaly RP, Mourad W. Staphylococcal enterotoxin D is a promiscuous superantigen offering multiple modes of interactions with the MHC class II receptors. J Immunol 1998; 160:225-32. [PMID: 9551975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Dimerization of MHC class II molecules on the cell surface of human THP-1 monocytic cell line is a requirement for staphylococcal superantigen (SAG)-induced cytokine gene expression. The capacities of various SAG to induce this response are governed by their modes of interaction with MHC class II molecules. Staphylococcal enterotoxin A (SEA), with its two binding sites, dimerizes MHC class II molecules and subsequently induces cytokine gene expression in THP-1 cells. Here, we demonstrate that staphylococcal enterotoxin D (SED) and staphylococcal enterotoxin E (SEE) induce, similarly, IL-1beta and TNF-alpha gene expression in these cells. Using mutated toxins that lost their binding site with the MHC class II alpha- or beta-chain, we demonstrate that this response is also mediated by the dimerization of MHC class II molecules through two binding sites. Furthermore, SED forms Zn2+-dependent homodimers that allow multiple modes of MHC class II clustering, including ligation of alpha-chains (alpha/alpha), beta-chains (beta/beta), or the alpha- and beta-chains of two different class II molecules. The beta/beta interaction following Zn2+-dependent SED/SED homodimer formation seems to be mediated by the appearance of a novel binding site on SED that interacts with histidine 81 of the MHC class II beta-chain. The different modes of SED interactions also influence SED-induced T cell activation where simultaneous ligation of the alpha- and beta-chains is essential for optimal response. These various modes of SED binding may be used to preserve bivalency regardless of variability in the MHC class II alpha/beta/peptide complexes.
Collapse
Affiliation(s)
- R Al-Daccak
- Centre de Recherche en Rhumatologie Immunologie, Le Centre Hospitalier de l'Université Laval, Sainte-Foy, Quebec, Canada
| | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Svensson LA, Schad EM, Sundström M, Antonsson P, Kalland T, Dohlsten M. Staphylococcal enterotoxins A, D, and E. Structure and function, including mechanism of T-cell superantigenicity. Prep Biochem Biotechnol 1997; 27:111-41. [PMID: 9292923 DOI: 10.1080/10826069708000073] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
|
21
|
Sundström M, Wallvide R. [Physicians do not have to have responsibility in leadership problems]. Lakartidningen 1997; 94:1051. [PMID: 9121232] [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: 02/04/2023]
|
22
|
Sundström M, Abrahmsén L, Antonsson P, Mehindate K, Mourad W, Dohlsten M. The crystal structure of staphylococcal enterotoxin type D reveals Zn2+-mediated homodimerization. EMBO J 1996; 15:6832-40. [PMID: 9003758 PMCID: PMC452508] [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: 02/03/2023] Open
Abstract
Bacterial superantigens, including the staphylococcal enterotoxins, are the most potent activators of T cells known and have been suggested as a causative factor in Gram-positive shock in humans. Staphylococcal enterotoxin D (SED) is dependent upon Zn2+ for high affinity interactions with MHC class II molecules and thus SED was co-crystallized with Zn2+. The crystal structure of SED has been determined in two different space groups, at 2.3 and 3.0 A resolution respectively. The three-dimensional structure of SED is similar to structures of other bacterial superantigens, although this study has revealed that SED has the unique capability of forming dimers in the presence of Zn2+. The high affinity Zn2+ site used in dimer formation is located on the surface of the beta-sheet in the C-terminal domain. Two bound metal ions are coordinated by residues from both molecules in the dimer interface and thus contribute directly to formation of the dimer. A second Zn2+ site is located on the surface close to the domain interface of the molecule. The unique feature of SED in forming a Zn2+-dependent homodimer seems to facilitate novel and biologically relevant multimeric interactions with MHC class II molecules, as shown by the induction of cytokine mRNA in human monocytes when exposed to SED and SED mutants.
Collapse
Affiliation(s)
- M Sundström
- Department of Structural Biochemistry, Pharmacia and Upjohn, Stockholm, Sweden
| | | | | | | | | | | |
Collapse
|
23
|
Sundström M, Hallén D, Svensson A, Schad E, Dohlsten M, Abrahmsén L. The Co-crystal structure of staphylococcal enterotoxin type A with Zn2+ at 2.7 A resolution. Implications for major histocompatibility complex class II binding. J Biol Chem 1996; 271:32212-6. [PMID: 8943278 DOI: 10.1074/jbc.271.50.32212] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.6] [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: 02/03/2023] Open
Abstract
Superantigens form complexes with major histocompatibility complex (MHC) class II molecules and T-cell receptors resulting in extremely strong immunostimulatory properties. Staphylococcus aureus enterotoxin A (SEA) belongs to a subgroup of the staphylococcal superantigens that utilizes Zn2+ in the high affinity interaction with MHC class II molecules. A high affinity metal binding site was described previously in SEA co-crystallized with Cd2+ in which the metal ion was octahedrally co-ordinated, involving the N-terminal serine. We have now co-crystallized SEA with its native co-factor Zn2+ and determined its crystal structure at 2.7 A resolution. As expected for a Zn2+ ion, the co-ordination was found to be tetrahedral. Three of the ligands are located on the SEA surface on a C-terminal domain beta-sheet, while the fourth varies with the conditions. Further analysis of the zinc binding event was performed using titration microcalorimetry, which showed that SEA binds Zn2+ with an affinity of KD = 0.3 microM in an entropy driven process. The differential Zn2+ co-ordination observed here has implications for the mechanism of the SEA-MHC class II interaction.
Collapse
Affiliation(s)
- M Sundström
- Department of Structural Biochemistry, Pharmacia & Upjohn, Stockholm, Sweden
| | | | | | | | | | | |
Collapse
|
24
|
Sundström M, Lundqvist T, Rödin J, Giebel LB, Milligan D, Norstedt G. Crystal structure of an antagonist mutant of human growth hormone, G120R, in complex with its receptor at 2.9 A resolution. J Biol Chem 1996; 271:32197-203. [PMID: 8943276 DOI: 10.1074/jbc.271.50.32197] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Human growth hormone binds two receptor molecules and thereby induces signal transduction through receptor dimerization. At high concentrations, growth hormone acts as an antagonist because of a large difference in affinities at the respective binding sites. This antagonist action can be enhanced further by reducing binding in the low affinity binding site. A growth hormone antagonist mutant Gly-120 --> Arg, has been crystallized with its receptor as a 1:1 complex and the crystal structure determined at 2.9 A resolution. The 1:1 complex is remarkably similar to the native growth hormone-receptor 1:2 complex. A comparison between the two structures reveals only minimal differences in the conformations of the hormone or its receptor in the two complexes, including the angle between the two immunoglobulin-like domains of the receptor. Further, two symmetry-related 1:1 complexes in the crystal form a 2:2 complex with a large solvent inaccessible area between two receptor molecules. In addition, we present here a native human growth hormone-human growth hormone-binding protein 1:2 complex structure at 2.5 A resolution. One important difference between our structure and the previously published crystal structure at 2.8 A is revealed. Trp-104 in the receptor, a key residue in the hormone-receptor interaction, has an altered conformation in the low affinity site enabling a favorable hydrogen bond to be formed with Asp-116 of the hormone.
Collapse
Affiliation(s)
- M Sundström
- Department of Structural Biochemistry, Pharmacia and Upjohn, Preclinical Research and Development, S-112 87 Stockholm, Sweden.
| | | | | | | | | | | |
Collapse
|
25
|
Wikner C, Meshalkina L, Nilsson U, Nikkola M, Lindqvist Y, Sundström M, Schneider G. Analysis of an invariant cofactor-protein interaction in thiamin diphosphate-dependent enzymes by site-directed mutagenesis. Glutamic acid 418 in transketolase is essential for catalysis. J Biol Chem 1994; 269:32144-50. [PMID: 7798210] [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: 01/27/2023] Open
Abstract
A homologous expression system and a purification protocol for pure, highly active recombinant yeast transketolase have been developed. The invariant transketolase residue Glu418, which forms a hydrogen bond to the N-1' nitrogen atom of the pyrimidine ring of the cofactor thiamin diphosphate has been replaced by glutamine and alanine. Crystallographic analyses of the mutants show that these amino acid substitutions do not induce structural changes beyond the site of mutation. In both cases, the cofactor binds in a manner identical to the wild-type enzyme. Significant differences in the CD spectra of the mutant transketolases compared with the spectrum of wild-type enzyme indicate differences in the electron distribution of the aminopyrimidine ring of the cofactor. The E418Q mutant shows 2% and the E418A mutant shows about 0.1% of the catalytic activity of wild-type enzyme. The affinities of the mutant enzymes for thiamin diphosphate are comparable with wild-type transketolase. The hydrogen bond between the coenzyme and the side chain of Glu418 is thus not required for coenzyme binding but essential for catalytic activity. The results demonstrate the functional importance of this interaction and support the molecular model for cofactor deprotonation, the first step in enzymatic thiamin catalysis.
Collapse
Affiliation(s)
- C Wikner
- Department of Molecular Biology, Swedish University of Agricultural Sciences, Uppsala
| | | | | | | | | | | | | |
Collapse
|
26
|
Wikner C, Meshalkina L, Nilsson U, Nikkola M, Lindqvist Y, Sundström M, Schneider G. Analysis of an invariant cofactor-protein interaction in thiamin diphosphate-dependent enzymes by site-directed mutagenesis. Glutamic acid 418 in transketolase is essential for catalysis. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(18)31612-0] [Citation(s) in RCA: 104] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
27
|
Ericson ML, Sundström M, Sansom DM, Charron DJ. Mutually exclusive binding of peptide and invariant chain to major histocompatibility complex class II antigens. J Biol Chem 1994; 269:26531-8. [PMID: 7929377] [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: 01/27/2023] Open
Abstract
The invariant chain is a membrane protein associated with the major histocompatibility complex class II antigens both intra- and extracellularly. The extracellular portion of the human invariant chain (Ii) was expressed in Escherichia coli as a fusion protein with a polyhistidine tail and purified by metal affinity chromatography. The recombinant Ii was used as a ligand to probe binding to the cell surface of Chinese hamster ovary cells stably transfected with human class II alpha and beta genes of the DR4 isotype. We show that recombinant Ii inhibits peptide loading on class II polypeptides and also the converse; the presence of peptide in the antigen groove prevents binding of fluorescein-conjugated Ii. Moreover, blocking of Ii binding by peptide did not require a transition of the class II dimers to an SDS-stable state. A monoclonal antibody, L243, known to bind to (or close to) the peptide pocket of the class II molecule likewise blocked Ii-fluorescein binding. Further, we investigated whether or not the Ii, a variety of bacterial superantigens or the CD4 molecule, have overlapping binding sites on the class II heterodimer. Of the class II ligands tested, reduced binding was detected for the Staphylococcus superantigen type SEB on cells precincubated with soluble Ii while the binding of the other ligands was either unchanged or marginally changed. These data clarify by a direct biochemical approach the binding characteristics of Ii in comparison with other class II ligands.
Collapse
Affiliation(s)
- M L Ericson
- Laboratoire d'Immunogénétique Humaine, INSERM U.396, Institut des Cordeliers, Paris, France
| | | | | | | |
Collapse
|
28
|
Ericson ML, Sundström M, Sansom DM, Charron DJ. Mutually exclusive binding of peptide and invariant chain to major histocompatibility complex class II antigens. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(18)47227-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
29
|
Sundström M, Lindqvist Y, Schneider G, Hellman U, Ronne H. Yeast TKL1 gene encodes a transketolase that is required for efficient glycolysis and biosynthesis of aromatic amino acids. J Biol Chem 1993; 268:24346-52. [PMID: 8226984] [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: 01/29/2023] Open
Abstract
A gene encoding transketolase, TKL1, was cloned from the budding yeast Saccharomyces cerevisiae using oligonucleotide primers derived from protein sequence data. The TKL1 sequence predicts a 74-kDa polypeptide which is related to other transketolases. A sequence comparison revealed that the transketolases can be subdivided into three evolutionary branches. We also found that the transketolases are related to another vitamin B1-dependent enzyme: the E1 subunit of pyruvate dehydrogenase from Escherichia coli. Gene disruption and overexpression experiments were used to investigate the function of transketolase in yeast. We found that growth on fermentable carbon sources, but not on gluconeogenic carbon sources, is reduced in cells disrupted for TKL1. This suggests that the glycolytic efficiency is impaired. Growth on fermentable carbon sources is also reduced in cells that overexpress TKL1. Finally, we found that cells disrupted for TKL1 are unable to grow in the absence of aromatic amino acids. This is most likely due to the fact that transketolase is required for the synthesis of erythrose-4-P, a precursor of the aromatic amino acids.
Collapse
Affiliation(s)
- M Sundström
- Department Molecular Biology, Swedish University of Agricultural Science, Uppsala Biomedical Center
| | | | | | | | | |
Collapse
|
30
|
Sundström M, Lindqvist Y, Schneider G, Hellman U, Ronne H. Yeast TKL1 gene encodes a transketolase that is required for efficient glycolysis and biosynthesis of aromatic amino acids. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(20)80532-8] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
|
31
|
Abstract
OBJECTIVES To study the prevalence of hand abnormalities in diabetic patients and to evaluate associations between the hand abnormalities and diabetic variables, ergonomic factors and smoking habits. DESIGN Cross-sectional study of 100 patients selected at random. Setting. Out-patient clinic, Department of Internal Medicine, Orebro Medical Centre Hospital in Sweden. MAIN OUTCOME MEASURES Presence and extent of carpal tunnel syndrome (CTS), Dupuytren's contracture (DC), flexor tenosynovitis (FTS), and limited joint mobility (LJM). Duration of diabetes, metabolic control, chronic diabetic complications, blood pressure, ergonomic factors and smoking habits. RESULTS Carpal tunnel syndrome, DC, FTS and LJM were each present in about 20% of the patients. Hand abnormalities were observed in 50 patients and more than one abnormality was found in 26 of the patients. The hand abnormalities were associated with the duration of diabetes but not with the metabolic control or with other diabetic complications. However, the diabetic complications were associated with bad metabolic control and with the duration of diabetes. Hand abnormalities correlated with heavy manual work but not with smoking habits. Twenty-five of the 50 patients with hand syndromes were disabled to such an extent that surgery was recommended. CONCLUSION The prevalence of hand abnormalities in diabetic patients is high and increases with the duration of diabetes. In many cases patients with hand abnormalities can be helped by surgery.
Collapse
Affiliation(s)
- A Gamstedt
- Department of Internal Medicine, Orebro Medical Centre Hospital, Sweden
| | | | | | | |
Collapse
|
32
|
Abstract
The structure determination of apotransketolase and the comparison of its three-dimensional structure with that of the holoenzyme has revealed that no large conformational changes are associated with cofactor binding. Two loops at the active site are flexible in the apoenzyme which enables ThDP to reach its binding site. Binding of the cofactor induces defined conformations for these two loops at the active site. One of these loops is directly involving in binding of the cofactors, Ca2+ and ThDP. This loop acts like a flap which closes off the diphosphate binding site. After binding of the cofactor, residues of this loop form interactions to residues of loop 383-398 from the second subunit. These interactions stabilize the conformation of the two loops from a flexible to a 'closed' conformation.
Collapse
Affiliation(s)
- M Sundström
- Department of Molecular Biology, Swedish University of Agricultural Sciences, Uppsala
| | | | | |
Collapse
|
33
|
Abstract
The crystal structure of Saccharomyces cerevisiae transketolase, a thiamine diphosphate dependent enzyme, has been determined to 2.5 A resolution. The enzyme is a dimer with the active sites located at the interface between the two identical subunits. The cofactor, vitamin B1 derived thiamine diphosphate, is bound at the interface between the two subunits. The enzyme subunit is built up of three domains of the alpha/beta type. The diphosphate moiety of thiamine diphosphate is bound to the enzyme at the carboxyl end of the parallel beta-sheet of the N-terminal domain and interacts with the protein through a Ca2+ ion. The thiazolium ring interacts with residues from both subunits, whereas the pyrimidine ring is buried in a hydrophobic pocket of the enzyme, formed by the loops at the carboxyl end of the beta-sheet in the middle domain in the second subunit. The structure analysis identifies amino acids critical for cofactor binding and provides mechanistic insights into thiamine catalysis.
Collapse
Affiliation(s)
- Y Lindqvist
- Department of Molecular Biology, Swedish University of Agricultural Sciences, Uppsala Biomedical Center
| | | | | | | |
Collapse
|
34
|
Schneider G, Sundström M, Lindqvist Y. Preliminary crystallographic data for transketolase from yeast. J Biol Chem 1989; 264:21619-20. [PMID: 2689443] [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: 01/02/2023] Open
Abstract
Crystals of the vitamin B1-dependent enzyme transketolase from baker's yeast have been grown from the apo- and the holoform of the enzyme, using PEG as precipitant. The crystals are orthorhombic, space group P2(1)2(1)2(1) with cell constants a = 76.3 A, b = 114.2 A, and c = 163.5 A. The crystals are stable in the x-ray beam and diffract to at least 2.2 A on a conventional x-ray source. The enzyme is a dimer of identical subunits, and a Vm value of 2.2 A/dalton indicates that the asymmetric unit contains a dimer. Rotation function calculations using native data (10-5 A) revealed a local 2-fold rotation axis with phi = 0 degree and omega = 20 degrees.
Collapse
Affiliation(s)
- G Schneider
- Department of Molecular Biology, Swedish University of Agricultural Sciences, Uppsala Biomedical Centre
| | | | | |
Collapse
|
35
|
|
36
|
Bergström H, Sundström M. [Labor movement has failed the forgotten and hidden people]. Vardfacket 1980; 4:44-6. [PMID: 6905571] [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: 01/22/2023]
|