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Lips EH, Debipersad R, Scheerman E, Mulder L, Sonke GS, van der Kolk LE, Wessling J, Hogervorst FBL, Nederlof PM. Abstract P4-12-03: Estrogen receptor-positive breast cancer in BRCA1 mutation carriers shows a BRCAness profile, suggesting sensitivity to drugs targeting homologous recombination deficiency. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p4-12-03] [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: 11/16/2022]
Abstract
Abstract
Background
As estrogen receptor (ER)-positive breast cancer in BRCA1 mutation carriers arises at an older age with less aggressive tumor characteristics than ER negative BRCA1 mutated breast cancer, it has been suggested that these tumors are 'sporadic' and not BRCA1-driven. With the introduction of targeted treatments specific for tumors with a non-functioning BRCA1 or BRCA2 gene, the question whether the BRCA genes are impaired in the tumor, is highly relevant. Therefore, we performed genomic profiling of BRCA1-mutated ER+ tumors.
Methods
Genomic profiling, BRCA1 promoter methylation assessment, and loss of heterozygosity (LOH) analysis were done on 16 BRCA1-mutated ER+ tumors. Results were compared with 57 BRCA1-mutated ER- tumors, 36 BRCA2-mutated ER+ associated tumors, and 182 sporadic ER+ tumors.
Results
The genomic profile of BRCA1-mutated ER+ tumors was different from BRCA1-mutated ER- breast tumors, but highly similar to BRCA2-mutated ER+ tumors. In 83% of the BRCA1-mutated ER+ tumors, loss of the wildtype BRCA1 allele was observed. Clinico-pathological variables in BRCA1-mutated ER+ cancer were more similar to BRCA2-mutated ER+ and sporadic ER+ breast cancer than to BRCA1 mutated ER- cancers.
Conclusions
As BRCA1-mutated ER+ tumors showed a BRCAness copy number profile and LOH, it is likely that the loss of a functional BRCA1 protein plays a role in tumorigenesis in BRCA1-mutated ER+ tumors. Therefore, we hypothesize that these tumors are sensitive to drugs targeting the BRCA1 gene defect.
Citation Format: Lips EH, Debipersad R, Scheerman E, Mulder L, Sonke GS, van der Kolk LE, Wessling J, Hogervorst FBL, Nederlof PM. Estrogen receptor-positive breast cancer in BRCA1 mutation carriers shows a BRCAness profile, suggesting sensitivity to drugs targeting homologous recombination deficiency [abstract]. In: Proceedings of the 2016 San Antonio Breast Cancer Symposium; 2016 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2017;77(4 Suppl):Abstract nr P4-12-03.
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Affiliation(s)
- EH Lips
- The Netherlands Cancer Institute- Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
| | - R Debipersad
- The Netherlands Cancer Institute- Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
| | - E Scheerman
- The Netherlands Cancer Institute- Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
| | - L Mulder
- The Netherlands Cancer Institute- Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
| | - GS Sonke
- The Netherlands Cancer Institute- Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
| | - LE van der Kolk
- The Netherlands Cancer Institute- Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
| | - J Wessling
- The Netherlands Cancer Institute- Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
| | - FBL Hogervorst
- The Netherlands Cancer Institute- Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
| | - PM Nederlof
- The Netherlands Cancer Institute- Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
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Wevers MR, Aaronson NK, Verhoef S, Bleiker EMA, Hahn DEE, Kuenen MA, van der Sanden-Melis J, Brouwer T, Hogervorst FBL, van der Luijt RB, Valdimarsdottir HB, van Dalen T, Theunissen EBM, van Ooijen B, de Roos MA, Borgstein PJ, Vrouenraets BC, Vriens E, Bouma WH, Rijna H, Vente JP, Witkamp AJ, Rutgers EJT, Ausems MGEM. Impact of rapid genetic counselling and testing on the decision to undergo immediate or delayed prophylactic mastectomy in newly diagnosed breast cancer patients: findings from a randomised controlled trial. Br J Cancer 2014; 110:1081-7. [PMID: 24423928 PMCID: PMC3929884 DOI: 10.1038/bjc.2013.805] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Revised: 12/02/2013] [Accepted: 12/04/2013] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Female breast cancer patients with a BRCA1/2 mutation have an increased risk of contralateral breast cancer. We investigated the effect of rapid genetic counselling and testing (RGCT) on choice of surgery. METHODS Newly diagnosed breast cancer patients with at least a 10% risk of a BRCA1/2 mutation were randomised to an intervention group (offer of RGCT) or a control group (usual care; ratio 2 : 1). Primary study outcomes were uptake of direct bilateral mastectomy (BLM) and delayed contralateral prophylactic mastectomy (CPM). RESULTS Between 2008 and 2010, we recruited 265 women. On the basis of intention-to-treat analyses, no significant group differences were observed in percentage of patients opting for a direct BLM (14.6% for the RGCT group vs 9.2% for the control group; odds ratio (OR) 2.31; confidence interval (CI) 0.92-5.81; P=0.08) or for a delayed CPM (4.5% for the RGCT group vs 5.7% for the control group; OR 0.89; CI 0.27-2.90; P=0.84). Per-protocol analysis indicated that patients who received DNA test results before surgery (59 out of 178 women in the RGCT group) opted for direct BLM significantly more often than patients who received usual care (22% vs 9.2%; OR 3.09, CI 1.15-8.31, P=0.03). INTERPRETATION Although the large majority of patients in the intervention group underwent rapid genetic counselling, only a minority received DNA test results before surgery. This may explain why offering RGCT yielded only marginally significant differences in uptake of BLM. As patients who received DNA test results before surgery were more likely to undergo BLM, we hypothesise that when DNA test results are made routinely available pre-surgery, they will have a more significant role in surgical treatment decisions.
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Affiliation(s)
- M R Wevers
- Division of Psychosocial Research and Epidemiology, The Netherlands Cancer Institute, PO Box 90203, 1006 BE Amsterdam, The Netherlands
- Division of Biomedical Genetics, University Medical Center Utrecht, PO Box 85090, 3508 AB Utrecht, The Netherlands
| | - N K Aaronson
- Division of Psychosocial Research and Epidemiology, The Netherlands Cancer Institute, PO Box 90203, 1006 BE Amsterdam, The Netherlands
| | - S Verhoef
- Family Cancer Clinic, The Netherlands Cancer Institute, PO Box 90203, 1006 BE Amsterdam, The Netherlands
| | - E M A Bleiker
- Division of Psychosocial Research and Epidemiology & Family Cancer Clinic, The Netherlands Cancer Institute, PO Box 90203, 1006 BE Amsterdam, The Netherlands
| | - D E E Hahn
- Department of Psychosocial Counseling, The Netherlands Cancer Institute, PO Box 90203, 1006 BE Amsterdam, The Netherlands
| | - M A Kuenen
- Division of Psychosocial Research and Epidemiology, The Netherlands Cancer Institute, PO Box 90203, 1006 BE Amsterdam, The Netherlands
| | - J van der Sanden-Melis
- Division of Biomedical Genetics, University Medical Center Utrecht, PO Box 85090, 3508 AB Utrecht, The Netherlands
| | - T Brouwer
- Division of Biomedical Genetics, University Medical Center Utrecht, PO Box 85090, 3508 AB Utrecht, The Netherlands
| | - F B L Hogervorst
- Division of Pathology, The Netherlands Cancer Institute, PO Box 90203, 1006 BE Amsterdam, The Netherlands
| | - R B van der Luijt
- Division of Biomedical Genetics, University Medical Center Utrecht, PO Box 85090, 3508 AB Utrecht, The Netherlands
| | - H B Valdimarsdottir
- Department of Oncological Sciences, Mount Sinai School of Medicine, Icahn Medical Institute, 1425 Madison Avenue, New York, NY 10029, USA
| | - T van Dalen
- Division of Surgery, Diakonessen Hospital, PO Box 80250, 3508 TG Utrecht, The Netherlands
| | - E B M Theunissen
- Division of Surgery, St Antonius Hospital, PO Box 2500, 3430EM Nieuwegein, The Netherlands
| | - B van Ooijen
- Division of Surgery, Meander Medical Center, PO Box 1502, 3800 BM Amersfoort, The Netherlands
| | - M A de Roos
- Division of Surgery, Rivierenland Hospital, PO Box 6024, 4000 HA Tiel, The Netherlands
| | - P J Borgstein
- Division of Surgery, Onze Lieve Vrouwe Gasthuis, PO Box 95500, 1090 HM Amsterdam, The Netherlands
| | - B C Vrouenraets
- Division of Surgery, St Lucas Andreas Hospital, PO Box 9243, 1006 AE Amsterdam, The Netherlands
| | - E Vriens
- Division of Surgery, Tergooi Hospitals, PO Box 10016, 1201 DA Blaricum, The Netherlands
| | - W H Bouma
- Division of Surgery, Gelre Hospitals, Albert Schweitzerlaan 31, 7334 DZ Apeldoorn, The Netherlands
| | - H Rijna
- Division of Surgery, Kennemer Gasthuis, PO Box 417, 2000 AK Haarlem, The Netherlands
| | - J P Vente
- Division of Surgery, Zuwe Hofpoort Hospital, PO Box 8000, 3440 JD Woerden, The Netherlands
| | - A J Witkamp
- Division of Surgery, University Medical Center Utrecht, PO Box 85500, 3508GA Utrecht, The Netherlands
| | - E J T Rutgers
- Division of Surgery, the Netherlands Cancer Institute, PO Box 90203, 1006 BE Amsterdam, The Netherlands
| | - M G E M Ausems
- Division of Biomedical Genetics, University Medical Center Utrecht, PO Box 85090, 3508 AB Utrecht, The Netherlands
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Lips EH, Mulder L, Oonk A, van der Kolk LE, Hogervorst FBL, Imholz ALT, Wesseling J, Rodenhuis S, Nederlof PM. Triple-negative breast cancer: BRCAness and concordance of clinical features with BRCA1-mutation carriers. Br J Cancer 2013; 108:2172-7. [PMID: 23558900 PMCID: PMC3670471 DOI: 10.1038/bjc.2013.144] [Citation(s) in RCA: 161] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Background: BRCAness is defined as shared tumour characteristics between sporadic and BRCA-mutated cancers. However, how to exactly measure BRCAness and its frequency in breast cancer is not known. Assays to establish BRCAness would be extremely valuable for the clinical management of these tumours. We assessed BRCAness characteristics frequencies in a large cohort of triple-negative breast cancers (TNBCs). Methods: As a measure of BRCAness, we determined a specific BRCA1-like pattern by array Comparative Genomic Hybridisation (aCGH), and BRCA1 promoter methylation in 377 TNBCs, obtained from 3 different patient cohorts. Clinicopathological data were available for all tumours, BRCA1-germline mutation status and chemotherapy response data were available for a subset. Results: Of the tumours, 66–69% had a BRCA1-like aCGH profile and 27–37% showed BRCA1 promoter methylation. BRCA1-germline mutations and BRCA1 promoter methylation were mutually exclusive events (P=1 × 10−5). BRCAness was associated with younger age and grade 3 tumours. Chemotherapy response was significantly higher in BRCA1-mutated tumours, but not in tumours with BRCAness (63% (12 out of 19) vs 35% (18 out of 52) pathological complete remission rate, respectively). Conclusion: The majority of the TNBCs show BRCAness, and those tumours share clinicopathological characteristics with BRCA1-mutated tumours. A better characterisation of TNBC and the presence of BRCAness could have consequences for both hereditary breast cancer screening and the treatment of these tumours.
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Affiliation(s)
- E H Lips
- Department of Molecular Pathology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
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ter BP, van DBE, Kristel P, Boon U, Moutinho FC, Esteller M, Hogervorst F, Gevensleben H, Turner N, Wesseling J, Jonkers J. P5-06-02: Response and Acquired Resistance of BRCA1-Deficient Triple-Negative Breast Cancer Xenografts to Alkylators or PARP Inhibitors. Cancer Res 2011. [DOI: 10.1158/0008-5472.sabcs11-p5-06-02] [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: 11/16/2022]
Abstract
Abstract
Background. BRCA1 mutated breast tumor cells are defective in DNA repair by homologous recombination and therefore especially sensitive to treatment with DNA double-strand break (DSB) inducing agents, such as alkylators or PARP inhibitors. However, such tumors can eventually develop therapy resistance. Understanding therapy resistance mechanisms may help in designing treatment strategies to overcome therapy resistance.
Methods. We have developed BRCA1-deficient triple-negative breast cancer (TNBC) xenograft models by implantating fresh human breast tumor pieces and subsequent serial passaging. These models show epigenetic loss of BRCA1 due to promoter hypermethylation or genetic inactivation of BRCA1 due to a frameshift mutation (c.2210delC) resulting in a premature stop codon (p.Thr737LeufsX15). We have used these BRCA1-deficient TNBC models to study response and acquisition of resistance to alkylating therapy (cisplatin, melphalan) and the clinical PARP inhibitor olaparib.
Results. Treated tumors were sensitive to the alkylators cisplatin or melphalan or the PARP inhibitor olaparib, in some cases resulting in complete remission with no palpable tumor left. However, relapses did occur in most cases and repeated treatment of recurrent tumors eventually led to aquired resistance.
Since restoration of BRCA1 function has been suggested as a mechanism of therapy resistance (Swisher et al., Cancer Res 2008; 68: 2581), we determined BRCA1 expression in therapy-sensitive and -resistant tumors by Western blot analysis. While no full length BRCA1 protein could be detected in the therapy-sensitive tumors, expression of full length BRCA1 protein was found in the majority of cisplatin resistant and olaparib resistant tumors. BRCA1 reexpression in the therapy-resistant BRCA1-c.2210delC tumors was caused by genetic restoration of the reading frame due to reversion to the wildtype sequence or additional deletions near the c.2210delC mutation. BRCA1-re-expression in the therapy-resistant TNBC xenografts with epigenetic loss of BRCA1 was caused either by loss of BRCA1 promoter methylation or by complex rearrangements at the BRCA1 locus.
Conclusion. Although BRCA1-deficient TNBC xenografts are initially very sensitive to alkylating agents and olaparib, resistance to treatment develops in almost all treated tumors. This acquired resistance is frequently associated with re-expression of BRCA1 due to secondary mutations or loss of promoter methylation.
Citation Information: Cancer Res 2011;71(24 Suppl):Abstract nr P5-06-02.
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Affiliation(s)
- Brugge P ter
- 1Netherlands Cancer Institute, Amsterdam, Netherlands; Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain; Gene function, Breakthrough breast cancer research centre, London, UK
| | - der Burg E van
- 1Netherlands Cancer Institute, Amsterdam, Netherlands; Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain; Gene function, Breakthrough breast cancer research centre, London, UK
| | - P Kristel
- 1Netherlands Cancer Institute, Amsterdam, Netherlands; Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain; Gene function, Breakthrough breast cancer research centre, London, UK
| | - U Boon
- 1Netherlands Cancer Institute, Amsterdam, Netherlands; Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain; Gene function, Breakthrough breast cancer research centre, London, UK
| | - Freixas C Moutinho
- 1Netherlands Cancer Institute, Amsterdam, Netherlands; Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain; Gene function, Breakthrough breast cancer research centre, London, UK
| | - M Esteller
- 1Netherlands Cancer Institute, Amsterdam, Netherlands; Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain; Gene function, Breakthrough breast cancer research centre, London, UK
| | - F Hogervorst
- 1Netherlands Cancer Institute, Amsterdam, Netherlands; Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain; Gene function, Breakthrough breast cancer research centre, London, UK
| | - H Gevensleben
- 1Netherlands Cancer Institute, Amsterdam, Netherlands; Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain; Gene function, Breakthrough breast cancer research centre, London, UK
| | - N Turner
- 1Netherlands Cancer Institute, Amsterdam, Netherlands; Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain; Gene function, Breakthrough breast cancer research centre, London, UK
| | - J Wesseling
- 1Netherlands Cancer Institute, Amsterdam, Netherlands; Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain; Gene function, Breakthrough breast cancer research centre, London, UK
| | - J Jonkers
- 1Netherlands Cancer Institute, Amsterdam, Netherlands; Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain; Gene function, Breakthrough breast cancer research centre, London, UK
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Didraga MA, van Beers EH, Joosse SA, Brandwijk KIM, Oldenburg RA, Wessels LFA, Hogervorst FBL, Ligtenberg MJ, Hoogerbrugge N, Verhoef S, Devilee P, Nederlof PM. A non-BRCA1/2 hereditary breast cancer sub-group defined by aCGH profiling of genetically related patients. Breast Cancer Res Treat 2011; 130:425-36. [PMID: 21286804 DOI: 10.1007/s10549-011-1357-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2010] [Accepted: 01/17/2011] [Indexed: 02/04/2023]
Abstract
Germline mutations in BRCA1 and BRCA2 explain approximately 25% of all familial breast cancers. Despite intense efforts to find additional high-risk breast cancer genes (BRCAx) using linkage analysis, none have been reported thus far. Here we explore the hypothesis that BRCAx breast tumors from genetically related patients share a somatic genetic etiology that might be revealed by array comparative genomic hybridization (aCGH) profiling. As BRCA1 and BRCA2 tumors can be identified on the basis of specific genomic profiles, the same may be true for a subset of BRCAx families. Analyses used aCGH to compare 58 non-BRCA1/2 familial breast tumors (designated BRCAx) to sporadic (non-familiar) controls, BRCA1 and BRCA2 tumors. The selection criteria for BRCAx families included at least three cases of breast cancer diagnosed before the age of 60 in the family, and the absence of ovarian or male breast cancer. Hierarchical cluster analysis was performed to determine sub-groups within the BRCAx tumor class and family heterogeneity. Analysis of aCGH profiles of BRCAx tumors indicated that they constitute a heterogeneous class, but are distinct from both sporadic and BRCA1/2 tumors. The BRCAx class could be divided into sub-groups. One subgroup was characterized by a gain of chromosome 22. Tumors from family members were classified within the same sub-group in agreement with the hypothesis that tumors from the same family would harbor a similar genetic background. This approach provides a method to target a sub-group of BRCAx families for further linkage analysis studies.
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Affiliation(s)
- M A Didraga
- Department of Experimental Therapy, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands.
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Osorio A, Milne RL, Pita G, Peterlongo P, Heikkinen T, Simard J, Chenevix-Trench G, Spurdle AB, Beesley J, Chen X, Healey S, Neuhausen SL, Ding YC, Couch FJ, Wang X, Lindor N, Manoukian S, Barile M, Viel A, Tizzoni L, Szabo CI, Foretova L, Zikan M, Claes K, Greene MH, Mai P, Rennert G, Lejbkowicz F, Barnett-Griness O, Andrulis IL, Ozcelik H, Weerasooriya N, Gerdes AM, Thomassen M, Cruger DG, Caligo MA, Friedman E, Kaufman B, Laitman Y, Cohen S, Kontorovich T, Gershoni-Baruch R, Dagan E, Jernström H, Askmalm MS, Arver B, Malmer B, Domchek SM, Nathanson KL, Brunet J, Ramón Y Cajal T, Yannoukakos D, Hamann U, Hogervorst FBL, Verhoef S, Gómez García EB, Wijnen JT, van den Ouweland A, Easton DF, Peock S, Cook M, Oliver CT, Frost D, Luccarini C, Evans DG, Lalloo F, Eeles R, Pichert G, Cook J, Hodgson S, Morrison PJ, Douglas F, Godwin AK, Sinilnikova OM, Barjhoux L, Stoppa-Lyonnet D, Moncoutier V, Giraud S, Cassini C, Olivier-Faivre L, Révillion F, Peyrat JP, Muller D, Fricker JP, Lynch HT, John EM, Buys S, Daly M, Hopper JL, Terry MB, Miron A, Yassin Y, Goldgar D, Singer CF, Gschwantler-Kaulich D, Pfeiler G, Spiess AC, Hansen TVO, Johannsson OT, Kirchhoff T, Offit K, Kosarin K, Piedmonte M, Rodriguez GC, Wakeley K, Boggess JF, Basil J, Schwartz PE, Blank SV, Toland AE, Montagna M, Casella C, Imyanitov EN, Allavena A, Schmutzler RK, Versmold B, Engel C, Meindl A, Ditsch N, Arnold N, Niederacher D, Deissler H, Fiebig B, Varon-Mateeva R, Schaefer D, Froster UG, Caldes T, de la Hoya M, McGuffog L, Antoniou AC, Nevanlinna H, Radice P, Benítez J. Evaluation of a candidate breast cancer associated SNP in ERCC4 as a risk modifier in BRCA1 and BRCA2 mutation carriers. Results from the Consortium of Investigators of Modifiers of BRCA1/BRCA2 (CIMBA). Br J Cancer 2009; 101:2048-54. [PMID: 19920816 PMCID: PMC2795432 DOI: 10.1038/sj.bjc.6605416] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Background: In this study we aimed to evaluate the role of a SNP in intron 1 of the ERCC4 gene (rs744154), previously reported to be associated with a reduced risk of breast cancer in the general population, as a breast cancer risk modifier in BRCA1 and BRCA2 mutation carriers. Methods: We have genotyped rs744154 in 9408 BRCA1 and 5632 BRCA2 mutation carriers from the Consortium of Investigators of Modifiers of BRCA1/2 (CIMBA) and assessed its association with breast cancer risk using a retrospective weighted cohort approach. Results: We found no evidence of association with breast cancer risk for BRCA1 (per-allele HR: 0.98, 95% CI: 0.93–1.04, P=0.5) or BRCA2 (per-allele HR: 0.97, 95% CI: 0.89–1.06, P=0.5) mutation carriers. Conclusion: This SNP is not a significant modifier of breast cancer risk for mutation carriers, though weak associations cannot be ruled out.
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Affiliation(s)
- A Osorio
- Human Genetics Group, Spanish National Cancer Research Centre, C/Melchor Fernández Almagro 3, 28029 Madrid, Spain.
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7
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Sinilnikova OM, Antoniou AC, Simard J, Healey S, Léoné M, Sinnett D, Spurdle AB, Beesley J, Chen X, Greene MH, Loud JT, Lejbkowicz F, Rennert G, Dishon S, Andrulis IL, Domchek SM, Nathanson KL, Manoukian S, Radice P, Konstantopoulou I, Blanco I, Laborde AL, Durán M, Osorio A, Benitez J, Hamann U, Hogervorst FBL, van Os TAM, Gille HJP, Peock S, Cook M, Luccarini C, Evans DG, Lalloo F, Eeles R, Pichert G, Davidson R, Cole T, Cook J, Paterson J, Brewer C, Hughes DJ, Coupier I, Giraud S, Coulet F, Colas C, Soubrier F, Rouleau E, Bièche I, Lidereau R, Demange L, Nogues C, Lynch HT, Schmutzler RK, Versmold B, Engel C, Meindl A, Arnold N, Sutter C, Deissler H, Schaefer D, Froster UG, Aittomäki K, Nevanlinna H, McGuffog L, Easton DF, Chenevix-Trench G, Stoppa-Lyonnet D. The TP53 Arg72Pro and MDM2 309G>T polymorphisms are not associated with breast cancer risk in BRCA1 and BRCA2 mutation carriers. Br J Cancer 2009; 101:1456-60. [PMID: 19707196 PMCID: PMC2768437 DOI: 10.1038/sj.bjc.6605279] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Background: The TP53 pathway, in which TP53 and its negative regulator MDM2 are the central elements, has an important role in carcinogenesis, particularly in BRCA1- and BRCA2-mediated carcinogenesis. A single nucleotide polymorphism (SNP) in the promoter region of MDM2 (309T>G, rs2279744) and a coding SNP of TP53 (Arg72Pro, rs1042522) have been shown to be of functional significance. Methods: To investigate whether these SNPs modify breast cancer risk for BRCA1 and BRCA2 mutation carriers, we pooled genotype data on the TP53 Arg72Pro SNP in 7011 mutation carriers and on the MDM2 309T>G SNP in 2222 mutation carriers from the Consortium of Investigators of Modifiers of BRCA1/2 (CIMBA). Data were analysed using a Cox proportional hazards model within a retrospective likelihood framework. Results: No association was found between these SNPs and breast cancer risk for BRCA1 (TP53: per-allele hazard ratio (HR)=1.01, 95% confidence interval (CI): 0.93–1.10, Ptrend=0.77; MDM2: HR=0.96, 95%CI: 0.84–1.09, Ptrend=0.54) or for BRCA2 mutation carriers (TP53: HR=0.99, 95%CI: 0.87–1.12, Ptrend=0.83; MDM2: HR=0.98, 95%CI: 0.80–1.21, Ptrend=0.88). We also evaluated the potential combined effects of both SNPs on breast cancer risk, however, none of their combined genotypes showed any evidence of association. Conclusion: There was no evidence that TP53 Arg72Pro or MDM2 309T>G, either singly or in combination, influence breast cancer risk in BRCA1 or BRCA2 mutation carriers.
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Affiliation(s)
- O M Sinilnikova
- Unité Mixte de Génétique Constitutionnelle des Cancers Fréquents, Hospices Civils de Lyon, Centre Léon Bérard, Lyon 69373, France.
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8
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Verhagen MMM, Abdo WF, Willemsen MAAP, Hogervorst FBL, Smeets DFCM, Hiel JAP, Brunt ER, van Rijn MA, Majoor Krakauer D, Oldenburg RA, Broeks A, Last JI, van't Veer LJ, Tijssen MAJ, Dubois AMI, Kremer HPH, Weemaes CMR, Taylor AMR, van Deuren M. Clinical spectrum of ataxia-telangiectasia in adulthood. Neurology 2009; 73:430-7. [PMID: 19535770 DOI: 10.1212/wnl.0b013e3181af33bd] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.4] [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
OBJECTIVE To describe the phenotype of adult patients with variant and classic ataxia-telangiectasia (A-T), to raise the degree of clinical suspicion for the diagnosis variant A-T, and to assess a genotype-phenotype relationship for mutations in the ATM gene. METHODS Retrospective analysis of the clinical characteristics and course of disease in 13 adult patients with variant A-T of 9 families and 6 unrelated adults with classic A-T and mutation analysis of the ATM gene and measurements of ATM protein expression and kinase activity. RESULTS Patients with variant A-T were only correctly diagnosed in adulthood. They often presented with extrapyramidal symptoms in childhood, whereas cerebellar ataxia appeared later. Four patients with variant A-T developed a malignancy. Patients with classic and variant A-T had elevated serum alpha-fetoprotein levels and chromosome 7/14 rearrangements. The mildest variant A-T phenotype was associated with missense mutations in the ATM gene that resulted in expression of some residual ATM protein with kinase activity. Two splicing mutations, c.331 + 5G>A and c.496 + 5G>A, caused a more severe variant A-T phenotype. The splicing mutation c.331 + 5G>A resulted in less ATM protein and kinase activity than the missense mutations. CONCLUSIONS Ataxia-telangiectasia (A-T) should be considered in patients with unexplained extrapyramidal symptoms. Early diagnosis is important given the increased risk of malignancies and the higher risk for side effects of subsequent cancer treatment. Measurement of serum alpha-fetoprotein and chromosomal instability precipitates the correct diagnosis. There is a clear genotype-phenotype relation for A-T, since the severity of the phenotype depends on the amount of residual kinase activity as determined by the genotype.
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Affiliation(s)
- M M M Verhagen
- Department of Pediatric Neurology, Radboud University Nijmegen Medical Centre, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, The Netherlands
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9
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Noordzij JG, Wulffraat NM, Haraldsson A, Meyts I, van't Veer LJ, Hogervorst FBL, Warris A, Weemaes CMR. Ataxia-telangiectasia patients presenting with hyper-IgM syndrome. Arch Dis Child 2009; 94:448-9. [PMID: 19224889 DOI: 10.1136/adc.2008.149351] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Ataxia-telangiectasia (A-T) is characterised by progressive neurological abnormalities, oculocutaneous telangiectasias and immunodeficiency (decreased serum IgG subclass and/or IgA levels and lymphopenia). However, 10% of A-T patients present with decreased serum IgG and IgA with normal or raised IgM levels. As cerebellar ataxia and oculocutaneous telangiectasias are not present at very young age, these patients are often erroneously diagnosed as hyper IgM syndrome (HIGM). Eight patients with A-T, showing serum Ig levels suggestive of HIGM on first presentation, are described. All had decreased numbers of T lymphocytes, unusual in HIGM. The diagnosis A-T was confirmed by raised alpha-fetoprotein levels in all patients. To prevent mistaking A-T patients for HIGM it is proposed to add DNA repair disorders as a possible cause of HIGM.
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Affiliation(s)
- J G Noordzij
- Department of Paediatrics, Reinier de Graaf Gasthuis, Delft, The Netherlands.
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10
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van Asperen CJ, Brohet RM, Meijers-Heijboer EJ, Hoogerbrugge N, Verhoef S, Vasen HFA, Ausems MGEM, Menko FH, Gomez Garcia EB, Klijn JGM, Hogervorst FBL, van Houwelingen JC, van't Veer LJ, Rookus MA, van Leeuwen FE. Cancer risks in BRCA2 families: estimates for sites other than breast and ovary. J Med Genet 2006; 42:711-9. [PMID: 16141007 PMCID: PMC1736136 DOI: 10.1136/jmg.2004.028829] [Citation(s) in RCA: 296] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
BACKGROUND In BRCA2 mutation carriers, increased risks have been reported for several cancer sites besides breast and ovary. As most of the families included in earlier reports were selected on the basis of multiple breast/ovarian cancer cases, it is possible that risk estimates may differ in mutation carriers with a less striking family history. METHODS In the Netherlands, 139 BRCA2 families with 66 different pathogenic mutations were included in a nationwide study. To avoid testing bias, we chose not to estimate risk in typed carriers, but rather in male and female family members with a 50% prior probability of being a carrier (n = 1811). The relative risk (RR) for each cancer site with the exception of breast and ovarian cancer was determined by comparing observed numbers with those expected, based on Dutch cancer incidence rates. RESULTS We observed an excess risk for four cancer sites: pancreas (RR 5.9; 95% confidence interval (CI) 3.2 to 10.0), prostate (2.5; 1.6 to 3.8), bone (14.4; 2.9 to 42.1) and pharynx (7.3; 2.0 to 18.6). A small increase was observed for cancer of the digestive tract (1.5; 1.1 to 1.9). Histological verification was available for 46% of the tumours. Nearly all increased risks reached statistical significance for men only. Cancer risks tended to be higher for people before the age of 65 years. Moreover, families with mutations outside the previously defined ovarian cancer cluster region tended to have a higher cancer risk. CONCLUSIONS We found that BRCA2 carriers are at increased risk for cancers of the prostate and pancreas, and possibly bone and pharynx. Larger databases with extended follow up are needed to provide insight into mutation specific risks of selected carriers in BRCA2 families.
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Abstract
Formalin-fixed, paraffin-embedded (FFPE) tissue archives are the largest and longest time-spanning collections of patient material in pathology archives. Methods to disclose information with molecular techniques, such as array comparative genomic hybridisation (aCGH) have rapidly developed but are still not optimal. Array comparative genomic hybridisation is one efficient method for finding tumour suppressors and oncogenes in solid tumours, and also for classification of tumours. The fastest way of analysing large numbers of tumours is through the use of archival tissue samples with first, the huge advantage of larger median follow-up time of patients studied and second, the advantage of being able to locate and analyse multiple tumours, even across generations, from related individuals (families). Unfortunately, DNA from archival tissues is not always suitable for molecular analysis due to insufficient quality. Until now, this quality remained undefined. We report the optimisation of a genomic-DNA isolation procedure from FFPE pathology archives in combination with a subsequent multiplex PCR-based quality-control that simply identified all samples refractory to further DNA-based analyses.
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Affiliation(s)
- E H van Beers
- Division of Experimental Therapy, Netherlands Cancer Institute NKI/AvL, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands.
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12
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Nederlof PM, van Beers E, Joosse S, Hogervorst FBL, Wessels LFA, Devilee P, Cornelisse C, Oldenburg R, Verhoef S, van 't Veer LJ. Discovering genetic profiles by array-CGH in familial breast tumors. Breast Cancer Res 2005. [PMCID: PMC4233587 DOI: 10.1186/bcr1166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
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13
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Gille JJP, Hogervorst FBL, Pals G, Wijnen JT, van Schooten RJ, Dommering CJ, Meijer GA, Craanen ME, Nederlof PM, de Jong D, McElgunn CJ, Schouten JP, Menko FH. Genomic deletions of MSH2 and MLH1 in colorectal cancer families detected by a novel mutation detection approach. Br J Cancer 2002; 87:892-7. [PMID: 12373605 PMCID: PMC2376172 DOI: 10.1038/sj.bjc.6600565] [Citation(s) in RCA: 129] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2002] [Revised: 07/17/2002] [Accepted: 08/07/2002] [Indexed: 11/17/2022] Open
Abstract
Hereditary non-polyposis colorectal cancer is an autosomal dominant condition due to germline mutations in DNA-mismatch-repair genes, in particular MLH1, MSH2 and MSH6. Here we describe the application of a novel technique for the detection of genomic deletions in MLH1 and MSH2. This method, called multiplex ligation-dependent probe amplification, is a quantitative multiplex PCR approach to determine the relative copy number of each MLH1 and MSH2 exon. Mutation screening of genes was performed in 126 colorectal cancer families selected on the basis of clinical criteria and in addition, for a subset of families, the presence of microsatellite instability (MSI-high) in tumours. Thirty-eight germline mutations were detected in 37 (29.4%) of these kindreds, 31 of which have a predicted pathogenic effect. Among families with MSI-high tumours 65.7% harboured germline gene defects. Genomic deletions accounted for 54.8% of the pathogenic mutations. A complete deletion of the MLH1 gene was detected in two families. The multiplex ligation-dependent probe amplification approach is a rapid method for the detection of genomic deletions in MLH1 and MSH2. In addition, it reveals alterations that might escape detection using conventional diagnostic techniques. Multiplex ligation-dependent probe amplification might be considered as an early step in the molecular diagnosis of hereditary non-polyposis colorectal cancer.
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Affiliation(s)
- J J P Gille
- Department of Clinical Genetics and Human Genetics, Cancer Family Clinic, VU University Medical Center, 1007 MB Amsterdam, The Netherlands.
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14
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Hogervorst F, Ligtenberg M, Brink G, Hageman S, Menko F, Willems R, Arts N, van't Veer L, Rutgers E. 0-8. Germ-line mutations in BRCA1 and BRCA2 are seldom found in `unilateral breast cancer only' families. Breast 1997. [DOI: 10.1016/s0960-9776(97)90589-0] [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: 11/29/2022] Open
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15
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Peelen T, van Vliet M, Petrij-Bosch A, Mieremet R, Szabo C, van den Ouweland AM, Hogervorst F, Brohet R, Ligtenberg MJ, Teugels E, van der Luijt R, van der Hout AH, Gille JJ, Pals G, Jedema I, Olmer R, van Leeuwen I, Newman B, Plandsoen M, van der Est M, Brink G, Hageman S, Arts PJ, Bakker MM, Devilee P. A high proportion of novel mutations in BRCA1 with strong founder effects among Dutch and Belgian hereditary breast and ovarian cancer families. Am J Hum Genet 1997; 60:1041-9. [PMID: 9150151 PMCID: PMC1712432] [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: 02/04/2023] Open
Abstract
We have identified 79 mutations in BRCA1 in a set of 643 Dutch and 23 Belgian hereditary breast and ovarian cancer families collected either for research or for clinical diagnostic purposes. Twenty-eight distinct mutations have been observed, 18 of them not previously reported and 12 of them occurring more than once. Most conspicuously, a 2804delAA mutation has been found 19 times and has never been reported outside the Netherlands. A common haplotype spanning > or = 375 kb could be identified for each of the nine examined recurrent mutations, indicating the presence of multiple BRCA1 founder mutations in the Dutch population. The 2804delAA mutation has been estimated to have originated approximately 32 generations ago. No specific breast or ovarian cancer phenotype could be assigned to any of the common mutations, and the ovarian cancer incidence among 18 families with the 2804delAA mutation was heterogeneous.
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Affiliation(s)
- T Peelen
- Department of Human Genetics, Leiden University Medical Center, The Netherlands
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16
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Delwel GO, Hogervorst F, Sonnenberg A. Cleavage of the alpha6A subunit is essential for activation of the alpha6Abeta1 integrin by phorbol 12-myristate 13-acetate. J Biol Chem 1996; 271:7293-6. [PMID: 8631745 DOI: 10.1074/jbc.271.13.7293] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.8] [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] Open
Abstract
The alpha6 integrin subunit is proteolytically cleaved during biosynthesis in a covalently associated heavy and light chain. To examine the importance of cleavage for the function of the alpha6 subunit, we introduced mutations in the cDNA encoding the RKKR (876-879) sequence, the presumed cleavage site, in which either one or two basic residues were replaced by glycine. Wild-type and mutant alpha6A cDNAs (alpha6GKKR, alpha6RKKG and alpha6RGGR) were transfected into K562 cells. The mutant alpha6A integrin subunits were expressed in association with endogenous beta1, at levels comparable to that of the wild-type alpha6Abeta1. A single alpha6A polypeptide chain (150 kDa) was precipitated from surface-labeled alpha6GKKR, alpha6RKKG, and alpha6-RGGR transfectants, while the separate heavy (120 kDa) and light chains (31 or 30 kDa) were precipitated from the wild-type alpha6RKKR transfectant. Thus, a change in the RKKR sequence prevents cleavage of alpha6. After activation by the anti-beta1 stimulatory mAb TS2/16 both cleaved and uncleaved alpha6Abeta1 integrins bound and spread on laminin-1. Remarkably, the phorbol ester phorbol 12-myristate 13-acetate, which activates wild-type alpha6Abeta1 to bind to laminin-1, did not activate uncleaved alpha6Abeta1. We conclude that uncleaved alpha6Abeta1 is capable of ligand binding and transducing outside/in signals, like wild-type alpha6A-beta1. However, inside/out signaling is affected. It appears that cleavage of alpha6 is required to generate the proper conformation in alpha6 that enables affinity modulation of the alpha6A-beta1 receptor by phorbol 12-myristate 13-acetate.
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Affiliation(s)
- G O Delwel
- Netherlands Cancer Institute, Division of Cell Biology, Amsterdam, The Netherlands
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17
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Niessen CM, Hogervorst F, Jaspars LH, de Melker AA, Delwel GO, Hulsman EH, Kuikman I, Sonnenberg A. The alpha 6 beta 4 integrin is a receptor for both laminin and kalinin. Exp Cell Res 1994; 211:360-7. [PMID: 8143784 DOI: 10.1006/excr.1994.1099] [Citation(s) in RCA: 255] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Previously, we have establish K562 transfectants that express either alpha 6A beta 1 or alpha 6B beta 1 (K alpha 6A or K alpha 6B) on their surface. Both cell lines bind to laminin and kalinin after treatment with the beta 1-stimulatory antibody TS2/16. Here we introduce the full-length beta 4 cDNA into the alpha 6A- and alpha 6B-expressing K562 cells and selected stably transfected cells. The beta 4 subunit was expressed on the surface of both transfectants and it formed dimers with the alpha 6A or alpha 6B subunits. Immunoprecipitation and preclearing analyses revealed that both transfectants expressed alpha 6 beta 1, in addition to alpha 6 beta 4. While K alpha 6A and K alpha 6B cells required TS2/16 stimulation for binding to laminin or kalinin, adhesion of the unstimulated beta 4-transfected K alpha 6A and K alpha 6B cells to these matrix components was already substantial. This adhesion was mediated by both alpha 6 beta 1 and alpha 6 beta 4 since it was completely blocked by an alpha 6-specific antibody or by a combination of anti-beta 1 and anti-beta 4 antibodies, but only partially by either of these latter two antibodies alone. Adhesion to laminin was completely blocked by an antiserum to laminin fragment E8 as was the adhesion to kalinin by an antibody to kalinin, demonstrating the specificity of adhesion. Both transfectants always adhered more strongly to kalinin than to laminin. Furthermore, binding to kalinin was less well blocked by antibodies to beta 4 than binding to laminin, indicating that the affinity of alpha 6 beta 4 for kalinin is higher than that for laminin. The fact that alpha 6 beta 1 mediated adhesion without TS2/16 stimulation on the beta 4-transfected K alpha 6A and K alpha 6B cells suggests that some activation of alpha 6 beta 1 had occurred in these cells, even though binding was increased when they were actively stimulated by the antibody TS2/16. Finally, we show that Mn2+ induced binding of solubilized alpha 6 beta 4 to matrix containing kalinin, deposited by the murine cell line RAC-11P/SD. This binding was inhibited by the anti-alpha 6 mAb GoH3. Together, these results indicate that both alpha 6 beta 1 and alpha 6 beta 4 are receptors for laminin and kalinin and that there are no differences in ligand specificity between the A and B variants of the alpha 6 subunit when associated with either beta 1 or beta 4.
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Affiliation(s)
- C M Niessen
- Division of Cell Biology, The Netherlands Cancer Institute, Amsterdam
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18
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Delwel GO, de Melker AA, Hogervorst F, Jaspars LH, Fles DL, Kuikman I, Lindblom A, Paulsson M, Timpl R, Sonnenberg A. Distinct and overlapping ligand specificities of the alpha 3A beta 1 and alpha 6A beta 1 integrins: recognition of laminin isoforms. Mol Biol Cell 1994; 5:203-15. [PMID: 8019006 PMCID: PMC301026 DOI: 10.1091/mbc.5.2.203] [Citation(s) in RCA: 185] [Impact Index Per Article: 6.2] [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: 01/28/2023] Open
Abstract
The ligand specificity of the alpha 3A beta 1 integrin was analyzed using K562 cells transfected with full-length alpha 3A cDNA and was compared with that of alpha 6A beta 1 in similarly transfected K562 cells. Clones were obtained that showed comparable surface expression of either alpha 3A beta 1 or alpha 6A beta 1 integrins. Those expressing alpha 3A beta 1 attached to and spread on immunopurified human kalinin and cellular matrices containing human kalinin, which is a particular isoform of laminin. In addition, alpha 3A transfectants adhered to bovine kidney laminins possessing a novel A chain variant. Binding to kalinin was blocked by a monoclonal antibody against the A chain constituent of kalinin and adhesion to both kalinin and kidney laminins by anti-alpha 3 and beta 1 monoclonal antibodies. The alpha 3A transfected cells bound more strongly to kalinin and bovine kidney laminins after treatment with the beta 1 stimulatory antibody TS2/16. A distinctly weaker and activation-dependent adhesion of alpha 3A transfectants was observed on human placental laminins possessing the Am chain variant (merosin), and no adhesion occurred on bovine heart laminins and murine EHS tumor laminin. Further inactive substrates were fibronectin, nidogen, and collagen types IV and VI, indicating that the alpha 3A beta 1 integrin is a much less promiscuous receptor than thought before. By contrast, alpha 6A transfected cells adhered to all laminin isoforms when stimulated with TS2/16. Adhesion also occurred only on bovine kidney laminins in the absence of TS2/16. These results demonstrate that both alpha 3A beta 1 and alpha 6A beta 1 integrins are typical laminin receptors but that their affinity and activation dependence for binding to various laminin isoforms differ considerably.
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Affiliation(s)
- G O Delwel
- Division of Cell Biology, The Netherlands Cancer Institute, Amsterdam
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19
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Delwel GO, Hogervorst F, Kuikman I, Paulsson M, Timpl R, Sonnenberg A. Expression and function of the cytoplasmic variants of the integrin alpha 6 subunit in transfected K562 cells. Activation-dependent adhesion and interaction with isoforms of laminin. J Biol Chem 1993; 268:25865-75. [PMID: 8245021] [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
Two variants of the cytoplasmic domain of the integrin alpha 6 subunit have been identified (alpha 6A and alpha 6B). To determine the role of each variant in mediating cell adhesion to laminin, we have independently expressed the alpha 6A and alpha 6B subunits in K562 cells. Both variants associated with endogenous beta 1 and were present at comparable levels on the surface of transfected K562 cells. After activation with phorbol ester (phorbol 12-myristate 13-acetate; PMA) or the stimulatory anti-beta 1 antibody TS2/16, alpha 6A beta 1 as well as alpha 6B beta 1 mediated cell adhesion to laminin and more specifically to its fragment E8. Furthermore, both integrin variants interacted with the laminin isoforms kalinin and merosin. Cell adhesion to laminin isoforms was inhibited by the alpha 6-specific monoclonal antibody GoH3. PMA was less efficient in stimulating adhesion than TS2/16 and stimulated adhesion of alpha 6B transfectants better than of alpha 6A transfectants. In contrast, TS2/16 stimulated the adhesion of the alpha 6A and alpha 6B transfectants to laminin to a similar extent. These findings indicate that the cells may regulate the activation of the two alpha 6 variants independently. Activation by PMA was associated with the phosphorylation of both alpha 6A and alpha 6B subunits, but there was no relationship between the degree of phosphorylation and the ability of the transfectants to adhere to laminin since alpha 6A became phosphorylated much more strongly by PMA than alpha 6B. Thus, both alpha 6A beta 1 and alpha 6B beta 1 on K562 cells are activation-dependent receptors for different isoforms of laminin.
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Affiliation(s)
- G O Delwel
- The Netherlands Cancer Institute, Division of Cell Biology, Amsterdam
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20
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Hogervorst F, Kuikman I, Noteboom E, Sonnenberg A. The role of phosphorylation in activation of the alpha 6A beta 1 laminin receptor. J Biol Chem 1993; 268:18427-30. [PMID: 8360143] [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: 01/30/2023] Open
Abstract
The phorbol ester phorbol 12-myristate 13-acetate (PMA) induces phosphorylation of serine residues in the cytoplasmic domain of the alpha 6A integrin subunit, as well as activation of the alpha 6A beta 1 laminin receptor. We examined whether phosphorylation correlates with the induction of high affinity binding of laminin by the alpha 6A beta 1 receptor. Two potential phosphorylation sites for protein kinase C, serine 1041 and serine 1048, are present in the cytoplasmic domain of the alpha 6A subunit. We introduced point mutations into the alpha 6A cDNA, replacing either one or both of the serine residues with alanine. Wild-type and mutant alpha 6A cDNAs were transfected into K562 cells. All alpha 6A subunit mutants were expressed at levels similar to those of wild-type alpha 6A and formed heterodimers with endogenous beta 1. Analysis of the phosphorylation state of wild-type and mutant alpha 6A subunits in resting K562 cells and after treatment with PMA showed that serine 1041, but not serine 1048, is the target residue of PMA-induced phosphorylation. Cells expressing alpha 6A mutant subunits or wild-type alpha 6A transfectants all bound laminin in the presence, but not in the absence of PMA; however, the extent of binding differed. Cells transfected with alpha 6A containing the serine to alanine mutation showed a 2-3-fold higher binding to laminin than cells transfected with alpha 6A containing serine 1041. The results indicate that phosphorylation of the alpha 6A cytoplasmic domain is not required for the induction of high affinity of the alpha 6A beta 1 receptor by PMA, and suggest that, in contrast, it may reduce the affinity of this integrin for ligand.
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Affiliation(s)
- F Hogervorst
- The Netherlands Cancer Institute, Division of Cell Biology, Amsterdam
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21
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Hogervorst F, Kuikman I, Noteboom E, Sonnenberg A. The role of phosphorylation in activation of the alpha 6A beta 1 laminin receptor. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(17)46641-5] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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22
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Hierck BP, Thorsteinsdóttir S, Niessen CM, Freund E, Iperen LV, Feyen A, Hogervorst F, Poelmann RE, Mummery CL, Sonnenberg A. Variants of the alpha 6 beta 1 laminin receptor in early murine development: distribution, molecular cloning and chromosomal localization of the mouse integrin alpha 6 subunit. Cell Adhes Commun 1993; 1:33-53. [PMID: 8081870 DOI: 10.3109/15419069309095680] [Citation(s) in RCA: 86] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Laminin (A:B1:B2) is a major component of the first basement membrane to appear in the developing mouse embryo. Its effects on morphogenesis and differentiation are mediated by interaction with cell surface receptors that are members of the integrin family. We have studied the expression of the alpha 6 subunit of murine alpha 6 beta 1 and its ligand, laminin, in preimplantation mouse embryos, embryo outgrowths and in embryonic stem (ES) cells and embryonal carcinoma (EC) cells. The alpha 6 subunit is present in the oocyte and throughout preimplantation development. Laminin A chain appears later than alpha 6 and has a more restricted distribution until the late blastocyst stage. alpha 6 beta 1 is strongly expressed in ES and EC cells; the levels of mRNA expression are not altered by differentiation. Molecular cloning of cDNA for the murine integrin alpha 6 subunit from a mammary gland lambda gt11 library showed, as in man, an open reading frame encoding two variants of alpha 6, alpha 6A and alpha 6B. The identity of the alpha 6 amino acid sequence to that in man and chicken is 93% and 73%, respectively. The gene for murine alpha 6 was mapped to chromosome 2. While undifferentiated ES and EC cells express only alpha 6B, alpha 6A is co-expressed in ES cells after differentiation is induced by retinoic acid. alpha 6B is also the only variant expressed in blastocyst stage embryos, but when blastocysts have grown out in culture both alpha 6A and alpha 6B are expressed reflecting the results in the cell lines. We suggest that the deposition of laminin in the embryo is a receptor-mediated process and that the shift in the expression of the variants, as the inner cell mass forms its first differentiated progeny, reflects a change in functional properties.
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Affiliation(s)
- B P Hierck
- Dept of Anatomy, Medical Faculty, University of Leiden, The Netherlands
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23
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Hogervorst F, Admiraal LG, Niessen C, Kuikman I, Janssen H, Daams H, Sonnenberg A. Biochemical characterization and tissue distribution of the A and B variants of the integrin alpha 6 subunit. J Biophys Biochem Cytol 1993; 121:179-91. [PMID: 7681434 PMCID: PMC2119779 DOI: 10.1083/jcb.121.1.179] [Citation(s) in RCA: 115] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Two cytoplasmic variants of the alpha 6 integrin, alpha 6A and alpha 6B, have been identified previously (Hogervorst, F., I. Kuikman, A. G. van Kessel, and A. Sonnenberg. 1991. Eur. J. Biochem. 199:425-433; Cooper, H. M., R. N. Tamura, and V. Quaranta. 1991. J. Cell Biol. 115:843-850). Using synthetic peptides, containing sequences of their cytoplasmic domains, we have produced mAbs specific for either of the variants. These antibodies reacted with a variety of different epithelial tissues. In some tissues (e.g., salivary gland) both variants could be detected while in others only one of the variants was found (e.g., alpha 6A in epidermis and alpha 6B in kidney). Among nonepithelial cells and tissues, perineural fibroblasts and Schwann cells in peripheral nerves and platelets reacted with anti-alpha 6A, while microvascular endothelia reacted with both anti-alpha 6A and anti-alpha 6B. From our immunohistochemical results there is not evidence that combination with beta 1 or beta 4 is restricted to one of the two variants of alpha 6. This was confirmed by immunoprecipitation studies which showed that both beta 1 and beta 4 were coprecipitated by both anti-alpha 6A or anti-alpha 6B antibodies from cells. Also, the distribution of alpha 6A and alpha 6B subunits associated with beta 1 on cells attached to laminin was similar: both were found in focal contacts colocalizing with vinculin. In contrast, the alpha 6A subunit, associated with beta 4 in cultures of a squamous cell carcinoma cell line, was found to codistribute with bullous pemphigoid antigen 230 in hemidesmosomal-like structures. The alpha 6A and alpha 6B variants, immunoprecipitated from various cell lines, exhibited slightly different electrophoretic mobilities. Analysis of the antigens under reducing conditions showed that the mobility of the light chains, but not of the heavy chains, is different. In addition, in some cells the light chains of alpha 6A and alpha 6B, each are of two different sizes. Treatment with N-glycanase showed that these two light chain variants of alpha 6A and alpha 6B are not due to differences in N-linked glycosylation, and may therefore represent alternative proteolytic products of the alpha 6 precursor. We further demonstrate that alpha 6A, but not alpha 6B, is a major target for PMA-induced phosphorylation. Phosphorylated alpha 6A contained phosphoserine and a small amount of phosphotyrosine. There are also two variants of the integrin alpha 3 subunit with different cytoplasmic domains, but in the cell lines examined only alpha 3A could be demonstrated by RT-PCR.(ABSTRACT TRUNCATED AT 400 WORDS)
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Affiliation(s)
- F Hogervorst
- Department of Immunohematology, The Netherlands Red Cross Blood Transfusion Service, Amsterdam
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Martin-Thouvenin V, Gendron MC, Hogervorst F, Figdor CG, Lanotte M. Phorbol ester-induced promyelocytic leukemia cell adhesion to marrow stromal cells involves fibronectin specific alpha 5 beta 1 integrin receptors. J Cell Physiol 1992; 153:95-102. [PMID: 1387876 DOI: 10.1002/jcp.1041530113] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The human promyelocytic cell line NB4 exhibited a weak adhesion capacity for bone marrow-derived stromal cells and their extracellular matrices (5-15% of adherent cells). Adhesion was enhanced by pulse-treatment of cells with phorbolester (PMA 10(-7) M). Adhesion was induced within minutes, was fibronectin-specific, and affected up to 100% of the treated cells. This biological response to PMA resulted from the activation of protein kinase C (PKC), since PKC inhibitors (staurosporine, sphingosine, CGP 41251, and calphostin C) prevented the phenomenon. Phenotypical analysis of integrin receptor expression (particularly FN receptors VLA-4 and VLA-5) at the membrane of untreated or PMA-treated cells revealed that PMA induced no significant modification of the level of expression of these receptors. However, inhibition studies carried out with anti-VLA monoclonal antibodies demonstrated that the FN-specific adhesion triggered by PKC involved the alpha 5 beta 1 FN-specific receptors (VLA-5). We showed that the binding of NB4 cells to fibronectin was RGD-dependent. PMA-induced adhesion was not correlated to phosphorylation of the VLA-5 receptor. These findings may partially explain the malignant behaviour of these cells: The loss of their capacity to adhere to stromal cells may arrest differentiation and explain the large number of leukemic cells in the circulation.
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Hogervorst F, Kuikman I, van Kessel AG, Sonnenberg A. Molecular cloning of the human alpha 6 integrin subunit. Alternative splicing of alpha 6 mRNA and chromosomal localization of the alpha 6 and beta 4 genes. Eur J Biochem 1991; 199:425-33. [PMID: 2070796 DOI: 10.1111/j.1432-1033.1991.tb16140.x] [Citation(s) in RCA: 145] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We have isolated cDNAs encoding the alpha 6 subunit from a lambda gt11 expression library from human keratinocytes by combined screening with a rabbit polyclonal anti-alpha 6 antibody and the polymerase chain reaction. The alpha 6 subunit encoded by this cDNA consists of 1050 amino acids with a 991-amino-acid extracellular, a 23-amino-acid transmembrane and a 36-amino-acid cytoplasmic domain. The extracellular domain contains three putative divalent cation-binding sites and nine potential N-linked glycosylation sites. From a cDNA library from normal human mammary gland cells two different cDNAs for alpha 6 were isolated, one of which is identical to the above cDNA. The two alpha 6 subunits, called alpha 6A and alpha 6B, encoded by the two cDNAs each have a unique cytoplasmic domain, that of alpha 6B being 18 amino acids longer than that of alpha 6A. Different carcinoma cell lines contain transcripts for both alpha 6 subunits. K562 leukemic cells have little alpha 6A or alpha 6B mRNAs. The overall level of expression varies in the carcinoma cell lines, but reflects alpha 6 cell surface expression. In A375 melanoma cells, however, cell surface expression of alpha 6 was low in spite of a high level of mRNA. This suggest that other mechanisms may be involved in regulating the expression of alpha 6 on the surface of these cells. The mRNA for both alpha 6 subunits is around 6 kb. The alpha 6 subunits are similar to other alpha subunits (26-31% identity with cleaved alpha subunits) of the integrin family but they are more similar to the alpha 3 subunit (40% identity). This high degree of similarity may be the basis for their functional resemblance since both alpha 3 and alpha 6 subunits, when associated with beta 1, function as laminin receptors and bind to the long arm of laminin. The genes for alpha 6 and beta 4, the alternative beta subunit with which alpha 6 combines on certain epithelial cells, were mapped to chromosome 2 and 17q11-qter, respectively.
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Affiliation(s)
- F Hogervorst
- Central Laboratory of the Netherlands Red Cross Blood Transfusion Service, Amsterdam
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van Kooyk Y, Weder P, Hogervorst F, Verhoeven AJ, van Seventer G, te Velde AA, Borst J, Keizer GD, Figdor CG. Activation of LFA-1 through a Ca2(+)-dependent epitope stimulates lymphocyte adhesion. J Cell Biol 1991; 112:345-54. [PMID: 1703161 PMCID: PMC2288821 DOI: 10.1083/jcb.112.2.345] [Citation(s) in RCA: 178] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The leukocyte function-associated molecule-1 (LFA-1) plays a key role in cell adhesion processes between cells of the immune system. We investigated the mechanism that may regulate LFA-1-ligand interactions, which result in cell-cell adhesion. To this end we employed an intriguing anti-LFA-1 alpha mAb (NKI-L16), capable of inducing rather than inhibiting cell adhesion. Aggregation induced by NKI-L16 or Fab fragments thereof is not the result of signals transmitted through LFA-1. The antibody was found to recognize a unique Ca2(+)-dependent activation epitope of LFA-1, which is essentially absent on resting lymphocytes, but becomes induced upon in vitro culture. Expression of this epitope correlates well with the capacity of cells to rapidly aggregate upon stimulation by PMA or through the TCR/CD3 complex, indicating that expression of the NKI-L16 epitope is essential for LFA-1 to mediate adhesion. However, expression of the NKI-L16 epitope in itself is not sufficient for cell binding since cloned T lymphocytes express the NKI-L16 epitope constitutively at high levels, but do not aggregate spontaneously. Based on these observations we propose the existence of three distinct forms of LFA-1: (a) an inactive form, which does not, or only partially exposes the NKI-L16 epitope, found on resting cells; (b) an intermediate, NKI-L16+ form, expressed by mature or previously activated cells; and (c) an active (NKI-L16+) form of LFA-1, capable of high affinity ligand binding, obtained after specific triggering of a lymphocyte through the TCR/CD3 complex, by PMA, or by binding of NKI-L16 antibodies.
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Affiliation(s)
- Y van Kooyk
- Division of Immunology, The Netherlands Cancer Institute, Amsterdam
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Hogervorst F, Kuikman I, von dem Borne AE, Sonnenberg A. Cloning and sequence analysis of beta-4 cDNA: an integrin subunit that contains a unique 118 kd cytoplasmic domain. EMBO J 1990; 9:765-70. [PMID: 2311578 PMCID: PMC551734 DOI: 10.1002/j.1460-2075.1990.tb08171.x] [Citation(s) in RCA: 171] [Impact Index Per Article: 5.0] [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: 11/11/2022] Open
Abstract
The alpha 6 beta 4 complex is a member of the integrin superfamily of adhesion receptors. A human keratinocyte lambda gt11 cDNA library was screened using a monoclonal antibody directed against the beta 4 subunit. Two cDNAs were selected and subsequently used to isolate a complete set of overlapping cDNA clones. The beta 4 subunit consists of 1778 amino acids with a 683 amino acid extracellular domain, a 23 amino acid transmembrane domain and an exceptionally long cytoplasmic domain of 1072 residues. The deduced amino-terminal sequence is in good agreement with the published amino-terminal sequence of purified beta 4. The extracellular domain contains five potential N-linked glycosylation sites and four cysteine-rich homologous repeat sequences. The extracellular part of the beta 4 subunit sequence shows 35% identify with other integrin beta subunits, but is the most different among this class of molecules. The transmembrane region is poorly conserved, whereas the cytoplasmic domain shows no substantial identity in any region to the cytoplasmic tails of the known beta sequences or to other protein sequences. The exceptionally long cytoplasmic domain suggests distinct interactions of the beta 4 subunit with cytoplasmic proteins.
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Affiliation(s)
- F Hogervorst
- Central Laboratory, The Netherlands Red Cross Blood Transfusion Service, Amsterdam
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Pals ST, Hogervorst F, Keizer GD, Thepen T, Horst E, Figdor CC. Identification of a widely distributed 90-kDa glycoprotein that is homologous to the Hermes-1 human lymphocyte homing receptor. J Immunol 1989; 143:851-7. [PMID: 2663988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Homing of recirculating lymphocytes from the blood into the lymphoid tissues is mediated by 90-kDa homing receptors on the lymphocyte cell surface, allowing selective binding to specialized endothelium lining high endothelial venules. This study describes two novel mAb, NKI-P1 and NKI-P2, directed against functional epitopes of a human lymphocyte homing receptor, gp90. Biochemical studies demonstrated that these antibodies recognize a 90-kDa glycoprotein which is similar to the Ag recognized by the mAb Hermes-1. This notion was confirmed by immunohistochemical studies showing identical reaction patterns. Furthermore, it was observed that NKI-P1 and NKI-P2 blocked adhesion of lymphocytes to high endothelial venules. Immunohistochemical, immunofluorescence, and immunoprecipitation studies revealed that gp90 is widely expressed on hemopoietic cells including lymphocytes, macrophages/dendritic cells, myeloid cells, and erythrocytes. The gp90 is also expressed on a number of nonhemopoietic cells such as endothelial cells, certain epithelial cells, and fibroblasts. In addition to its expression on normal cells, gp90 is present on a spectrum of tumor cell lines of lymphoid, monocytic, epithelial, glial, and melanocytic origin. In addition to the 90-kDa product, the antibodies immunoprecipitate several polypeptides in the range of 120 to 200 kDa. Interestingly, it was observed that certain mamma tumor cell-line cells lack the 90-kDa polypeptide indicating the heterogeneous expression of the molecules recognized by the antibodies. These results indicate that the 90-kDa glycoprotein homologues of the Hermes-1 human lymphocyte homing receptor are expressed on hemopoietic tissues as well as on a number of nonhemopoietic tissues and tumor cell lines. Although the function of these molecules in nonlymphoid cells is presently unknown, they might play a role in cell-cell or cell-matrix adhesion.
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Affiliation(s)
- S T Pals
- Department of Pathology, Free University, Amsterdam, The Netherlands
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Pals ST, Hogervorst F, Keizer GD, Thepen T, Horst E, Figdor CC. Identification of a widely distributed 90-kDa glycoprotein that is homologous to the Hermes-1 human lymphocyte homing receptor. The Journal of Immunology 1989. [DOI: 10.4049/jimmunol.143.3.851] [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] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
Homing of recirculating lymphocytes from the blood into the lymphoid tissues is mediated by 90-kDa homing receptors on the lymphocyte cell surface, allowing selective binding to specialized endothelium lining high endothelial venules. This study describes two novel mAb, NKI-P1 and NKI-P2, directed against functional epitopes of a human lymphocyte homing receptor, gp90. Biochemical studies demonstrated that these antibodies recognize a 90-kDa glycoprotein which is similar to the Ag recognized by the mAb Hermes-1. This notion was confirmed by immunohistochemical studies showing identical reaction patterns. Furthermore, it was observed that NKI-P1 and NKI-P2 blocked adhesion of lymphocytes to high endothelial venules. Immunohistochemical, immunofluorescence, and immunoprecipitation studies revealed that gp90 is widely expressed on hemopoietic cells including lymphocytes, macrophages/dendritic cells, myeloid cells, and erythrocytes. The gp90 is also expressed on a number of nonhemopoietic cells such as endothelial cells, certain epithelial cells, and fibroblasts. In addition to its expression on normal cells, gp90 is present on a spectrum of tumor cell lines of lymphoid, monocytic, epithelial, glial, and melanocytic origin. In addition to the 90-kDa product, the antibodies immunoprecipitate several polypeptides in the range of 120 to 200 kDa. Interestingly, it was observed that certain mamma tumor cell-line cells lack the 90-kDa polypeptide indicating the heterogeneous expression of the molecules recognized by the antibodies. These results indicate that the 90-kDa glycoprotein homologues of the Hermes-1 human lymphocyte homing receptor are expressed on hemopoietic tissues as well as on a number of nonhemopoietic tissues and tumor cell lines. Although the function of these molecules in nonlymphoid cells is presently unknown, they might play a role in cell-cell or cell-matrix adhesion.
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Affiliation(s)
- S T Pals
- Department of Pathology, Free University, Amsterdam, The Netherlands
| | - F Hogervorst
- Department of Pathology, Free University, Amsterdam, The Netherlands
| | - G D Keizer
- Department of Pathology, Free University, Amsterdam, The Netherlands
| | - T Thepen
- Department of Pathology, Free University, Amsterdam, The Netherlands
| | - E Horst
- Department of Pathology, Free University, Amsterdam, The Netherlands
| | - C C Figdor
- Department of Pathology, Free University, Amsterdam, The Netherlands
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Sonnenberg A, Hogervorst F, Osterop A, Veltman FE. Identification and characterization of a novel antigen complex on mouse mammary tumor cells using a monoclonal antibody against platelet glycoprotein Ic. J Biol Chem 1988; 263:14030-8. [PMID: 2459116] [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: 01/01/2023] Open
Abstract
The rat monoclonal antibody GoH3 identifies a complex of glycoproteins Ic and IIa on human and mouse platelets. The GoH3 epitope is located on glycoprotein Ic. A novel glycoprotein complex is identified by GoH3 on the surface membranes of mouse mammary epithelial tumor cells. This antigen complex is composed of glycoprotein Ic noncovalently associated with a monomor or a disulfide-linked multimer of a high molecular weight glycoprotein (Ic-binding protein (IcBP]. Glycoprotein Ic is synthesized as a large precursor with asparagine N-linked high mannose oligosaccharides. Processing of this precursor involves a proteolytic cleavage of the large polypeptides into two smaller disulfide-linked polypeptide chains, Ic alpha (heavy) and Ic beta (light), and conversion of the majority of the high mannose oligosaccharides into complex-type glycans. Likewise, glycoprotein IcBP is initially glycosylated with high mannose asparagine N-linked oligosaccharides which are processed to complex units in the mature form. Association of glycoprotein Ic with IcBP occurs within the cell soon after their synthesis. The kinetics of labeling show non-coordinate processing consistent with the idea that the concentration of glycoprotein Ic limits complex formation and the subsequent processing of glycoprotein IcBP.
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Affiliation(s)
- A Sonnenberg
- Division of Tumor Biology, Netherlands Cancer Institute (Antoni van Leeuwenhoekhuis), Amsterdam
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Sonnenberg A, Janssen H, Hogervorst F, Calafat J, Hilgers J. A complex of platelet glycoproteins Ic and IIa identified by a rat monoclonal antibody. J Biol Chem 1987; 262:10376-83. [PMID: 3301835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
A rat monoclonal antibody, GoH3, recognizes cell surface antigens on epithelial cells in a variety of tissues in both man and mouse. Furthermore, the antibody showed reactivity with endothelial cells and blood platelets. The molecule recognized by GoH3 on platelets was determined by immunoprecipitation, followed by analysis on one- and two-dimensional sodium dodecyl sulfate-polyacrylamide gels. GoH3 precipitated glycoproteins Ic and IIa from both human and mouse platelets. Glycoprotein Ic consists of disulfide-linked heavy and light chains which both appeared to be glycosylated. As determined by enzymatic digestion followed by gel analyses, both "complex" and "high mannose" type of N-linked oligosaccharides are present on the heavy and light chain of human glycoprotein Ic and on the heavy chain of mouse glycoprotein Ic. The light chain of mouse glycoprotein Ic only carries high mannose type of N-linked oligosaccharides. The N-linked glycans on human and mouse glycoprotein IIa are all of the complex type. The glycoproteins Ic and IIa co-sedimented in sucrose gradients and formed complexes upon treatment of intact platelets with the chemical cross-linking reagent dithiobis(succinimidyl propionate). Dissociation of the complex by chaotropic agents followed by immunoprecipitation establishes that the epitope recognized by GoH3 is located on the Ic molecule. These results provide evidence that the two glycoproteins, Ic and IIa, exist as a heterodimer complex in the platelet membrane.
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Sonnenberg A, Janssen H, Hogervorst F, Calafat J, Hilgers J. A complex of platelet glycoproteins Ic and IIa identified by a rat monoclonal antibody. J Biol Chem 1987. [DOI: 10.1016/s0021-9258(18)61123-8] [Citation(s) in RCA: 213] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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