Skip to main content
Erschienen in: Cancer Chemotherapy and Pharmacology 5/2010

01.10.2010 | Original Article

The Bcl-2 inhibitor ABT-263 enhances the response of multiple chemotherapeutic regimens in hematologic tumors in vivo

verfasst von: Scott Ackler, Michael J. Mitten, Kelly Foster, Anatol Oleksijew, Marion Refici, Stephen K. Tahir, Yu Xiao, Christin Tse, David J. Frost, Stephen W. Fesik, Saul H. Rosenberg, Steven W. Elmore, Alexander R. Shoemaker

Erschienen in: Cancer Chemotherapy and Pharmacology | Ausgabe 5/2010

Einloggen, um Zugang zu erhalten

Abstract

Purpose

This study was designed to test the ability of the Bcl-2 family inhibitor ABT-263 to potentiate commonly used chemotherapeutic agents and regimens in hematologic tumor models.

Methods

Models of B-cell lymphoma and multiple myeloma were tested in vitro and in vivo with ABT-263 in combination with standard chemotherapeutic regimens, including VAP, CHOP and R-CHOP, as well as single cytotoxic agents including etoposide, rituximab, bortezomib and cyclophosphamide. Alterations in Bcl-2 family member expression patterns were analyzed to define mechanisms of potentiation.

Results

ABT-263 was additive with etoposide, vincristine and VAP in vitro in the diffuse large B-cell lymphoma line (DLBCL) DoHH-2, while rituximab potentiated its activity in SuDHL-4. Bortezomib strongly synergized with ABT-263 in the mantle cell lymphoma line Granta 519. Treatment of DoHH-2 with etoposide was associated with an increase in Puma expression, while bortezomib upregulated Noxa expression in Granta 519. Combination of ABT-263 with cytotoxic agents demonstrated superior tumor growth inhibition and delay in multiple models versus cytotoxic therapy alone, along with significant improvements in tumor response rates.

Conclusions

Inhibition of the Bcl-2 family of proteins by ABT-263 enhances the cytotoxicity of multiple chemotherapeutics in hematologic tumors and represents a promising addition to the therapeutic arsenal for treatment of these diseases.
Anhänge
Nur mit Berechtigung zugänglich
Literatur
2.
Zurück zum Zitat Cvetkovic RS, Perry CM (2006) Rituximab: a review of its use in non-Hodgkin’s lymphoma and chronic lymphocytic leukaemia. Drugs 66:791–820CrossRefPubMed Cvetkovic RS, Perry CM (2006) Rituximab: a review of its use in non-Hodgkin’s lymphoma and chronic lymphocytic leukaemia. Drugs 66:791–820CrossRefPubMed
3.
Zurück zum Zitat Orlowski RZ, Kuhn DJ (2008) Proteasome inhibitors in cancer therapy: lessons from the first decade. Clin Cancer Res 14:1649–1657CrossRefPubMed Orlowski RZ, Kuhn DJ (2008) Proteasome inhibitors in cancer therapy: lessons from the first decade. Clin Cancer Res 14:1649–1657CrossRefPubMed
4.
Zurück zum Zitat Utecht KN, Kolesar J (2008) Bortezomib: a novel chemotherapeutic agent for hematologic malignancies. Am J Health Syst Pharm 65:1221–1231CrossRefPubMed Utecht KN, Kolesar J (2008) Bortezomib: a novel chemotherapeutic agent for hematologic malignancies. Am J Health Syst Pharm 65:1221–1231CrossRefPubMed
6.
Zurück zum Zitat Reed JC (1997) Bcl-2 family proteins: regulators of apoptosis and chemoresistance in hematologic malignancies. Semin Hematol 34:9–19PubMed Reed JC (1997) Bcl-2 family proteins: regulators of apoptosis and chemoresistance in hematologic malignancies. Semin Hematol 34:9–19PubMed
7.
Zurück zum Zitat Tsujimoto Y, Finger LR, Yunis J, Nowell PC, Croce CM (1984) Cloning of the chromosome breakpoint of neoplastic B cells with the t(14;18) chromosome translocation. Science 226:1097–1099CrossRefPubMed Tsujimoto Y, Finger LR, Yunis J, Nowell PC, Croce CM (1984) Cloning of the chromosome breakpoint of neoplastic B cells with the t(14;18) chromosome translocation. Science 226:1097–1099CrossRefPubMed
8.
Zurück zum Zitat Agarwal B, Naresh KN (2002) Bcl-2 family of proteins in indolent B-cell non-Hodgkin’s lymphoma: study of 116 cases. Am J Hematol 70:278–282CrossRefPubMed Agarwal B, Naresh KN (2002) Bcl-2 family of proteins in indolent B-cell non-Hodgkin’s lymphoma: study of 116 cases. Am J Hematol 70:278–282CrossRefPubMed
9.
Zurück zum Zitat Harada N, Hata H, Yoshida M et al (1998) Expression of Bcl-2 family of proteins in fresh myeloma cells. Leukemia 12:1817–1820CrossRefPubMed Harada N, Hata H, Yoshida M et al (1998) Expression of Bcl-2 family of proteins in fresh myeloma cells. Leukemia 12:1817–1820CrossRefPubMed
10.
Zurück zum Zitat Alizadeh AA, Eisen MB, Davis RE et al (2000) Distinct types of diffuse large B-cell lymphoma identified by gene expression profiling. Nature 403:503–511CrossRefPubMed Alizadeh AA, Eisen MB, Davis RE et al (2000) Distinct types of diffuse large B-cell lymphoma identified by gene expression profiling. Nature 403:503–511CrossRefPubMed
11.
Zurück zum Zitat Packham G, Stevenson FK (2005) Bodyguards and assassins: Bcl-2 family proteins and apoptosis control in chronic lymphocytic leukaemia. Immunology 114:441–449CrossRefPubMed Packham G, Stevenson FK (2005) Bodyguards and assassins: Bcl-2 family proteins and apoptosis control in chronic lymphocytic leukaemia. Immunology 114:441–449CrossRefPubMed
12.
Zurück zum Zitat Tu Y, Renner S, Xu F et al (1998) Bcl-X expression in multiple myeloma: possible indicator of chemoresistance. Cancer Res 58:256–262PubMed Tu Y, Renner S, Xu F et al (1998) Bcl-X expression in multiple myeloma: possible indicator of chemoresistance. Cancer Res 58:256–262PubMed
13.
Zurück zum Zitat Fukumi S, Horiguchi-Yamada J, Nakada S, Nagai M, Ohno T, Yamada H (2000) Differential responses of Bcl-2 family genes to etoposide in chronic myeloid leukemia K562 cells. Mol Cell Biochem 206:43–50CrossRefPubMed Fukumi S, Horiguchi-Yamada J, Nakada S, Nagai M, Ohno T, Yamada H (2000) Differential responses of Bcl-2 family genes to etoposide in chronic myeloid leukemia K562 cells. Mol Cell Biochem 206:43–50CrossRefPubMed
14.
Zurück zum Zitat Floros KV, Thomadaki H, Florou D, Talieri M, Scorilas A (2006) Alterations in mRNA expression of apoptosis-related genes BCL2, BAX, FAS, caspase-3, and the novel member BCL2L12 after treatment of human leukemic cell line HL60 with the antineoplastic agent etoposide. Ann N Y Acad Sci 1090:89–97CrossRefPubMed Floros KV, Thomadaki H, Florou D, Talieri M, Scorilas A (2006) Alterations in mRNA expression of apoptosis-related genes BCL2, BAX, FAS, caspase-3, and the novel member BCL2L12 after treatment of human leukemic cell line HL60 with the antineoplastic agent etoposide. Ann N Y Acad Sci 1090:89–97CrossRefPubMed
15.
Zurück zum Zitat Belhoussine R, Morjani H, Gillet R, Palissot V, Manfait M (1999) Two distinct modes of oncoprotein expression during apoptosis resistance in vincristine and daunorubicin multidrug-resistant HL60 cells. Adv Exp Med Biol 457:365–381PubMed Belhoussine R, Morjani H, Gillet R, Palissot V, Manfait M (1999) Two distinct modes of oncoprotein expression during apoptosis resistance in vincristine and daunorubicin multidrug-resistant HL60 cells. Adv Exp Med Biol 457:365–381PubMed
16.
Zurück zum Zitat Liu FT, Agrawal SG, Gribben JG et al (2008) Bortezomib blocks Bax degradation in malignant B cells during treatment with TRAIL. Blood 111:2797–2805CrossRefPubMed Liu FT, Agrawal SG, Gribben JG et al (2008) Bortezomib blocks Bax degradation in malignant B cells during treatment with TRAIL. Blood 111:2797–2805CrossRefPubMed
17.
Zurück zum Zitat Gomez-Bougie P, Wuilleme-Toumi S, Menoret E et al (2007) Noxa up-regulation and Mcl-1 cleavage are associated to apoptosis induction by bortezomib in multiple myeloma. Cancer Res 67:5418–5424CrossRefPubMed Gomez-Bougie P, Wuilleme-Toumi S, Menoret E et al (2007) Noxa up-regulation and Mcl-1 cleavage are associated to apoptosis induction by bortezomib in multiple myeloma. Cancer Res 67:5418–5424CrossRefPubMed
18.
Zurück zum Zitat Byrd JC, Kitada S, Flinn IW et al (2002) The mechanism of tumor cell clearance by rituximab in vivo in patients with B-cell chronic lymphocytic leukemia: evidence of caspase activation and apoptosis induction. Blood 99:1038–1043CrossRefPubMed Byrd JC, Kitada S, Flinn IW et al (2002) The mechanism of tumor cell clearance by rituximab in vivo in patients with B-cell chronic lymphocytic leukemia: evidence of caspase activation and apoptosis induction. Blood 99:1038–1043CrossRefPubMed
19.
Zurück zum Zitat Tse C, Shoemaker AR, Adickes J et al (2008) ABT-263: a potent and orally bioavailable Bcl-2 family inhibitor. Cancer Res 68:3421–3428CrossRefPubMed Tse C, Shoemaker AR, Adickes J et al (2008) ABT-263: a potent and orally bioavailable Bcl-2 family inhibitor. Cancer Res 68:3421–3428CrossRefPubMed
20.
Zurück zum Zitat Ackler S, Xiao Y, Mitten MJ et al (2008) ABT-263 and rapamycin act cooperatively to kill lymphoma cells in vitro and in vivo. Mol Cancer Ther 7:3265–3274CrossRefPubMed Ackler S, Xiao Y, Mitten MJ et al (2008) ABT-263 and rapamycin act cooperatively to kill lymphoma cells in vitro and in vivo. Mol Cancer Ther 7:3265–3274CrossRefPubMed
21.
Zurück zum Zitat Lock R, Carol H, Houghton PJ et al (2008) Initial testing (stage 1) of the BH3 mimetic ABT-263 by the pediatric preclinical testing program. Pediatr Blood Cancer 50:1181–1189CrossRefPubMed Lock R, Carol H, Houghton PJ et al (2008) Initial testing (stage 1) of the BH3 mimetic ABT-263 by the pediatric preclinical testing program. Pediatr Blood Cancer 50:1181–1189CrossRefPubMed
22.
Zurück zum Zitat Del Gaizo Moore V, Brown JR, Certo M, Love TM, Novina CD, Letai A (2007) Chronic lymphocytic leukemia requires BCL2 to sequester prodeath BIM, explaining sensitivity to BCL2 antagonist ABT-737. J Clin Invest 117:112–121CrossRefPubMed Del Gaizo Moore V, Brown JR, Certo M, Love TM, Novina CD, Letai A (2007) Chronic lymphocytic leukemia requires BCL2 to sequester prodeath BIM, explaining sensitivity to BCL2 antagonist ABT-737. J Clin Invest 117:112–121CrossRefPubMed
23.
Zurück zum Zitat Paoluzzi L, Gonen M, Bhagat G et al (2008) The BH3-only mimetic ABT-737 synergizes the antineoplastic activity of proteasome inhibitors in lymphoid malignancies. Blood 112:2906–2916CrossRefPubMed Paoluzzi L, Gonen M, Bhagat G et al (2008) The BH3-only mimetic ABT-737 synergizes the antineoplastic activity of proteasome inhibitors in lymphoid malignancies. Blood 112:2906–2916CrossRefPubMed
24.
Zurück zum Zitat Kang MH, Kang YH, Szymanska B et al (2007) Activity of vincristine, L-ASP, and dexamethasone against acute lymphoblastic leukemia is enhanced by the BH3-mimetic ABT-737 in vitro and in vivo. Blood 110:2057–2066CrossRefPubMed Kang MH, Kang YH, Szymanska B et al (2007) Activity of vincristine, L-ASP, and dexamethasone against acute lymphoblastic leukemia is enhanced by the BH3-mimetic ABT-737 in vitro and in vivo. Blood 110:2057–2066CrossRefPubMed
25.
Zurück zum Zitat Mohammad RM, Wang S, Aboukameel A et al (2005) Preclinical studies of a nonpeptidic small-molecule inhibitor of Bcl-2 and Bcl-xL [(-)-gossypol] against diffuse large cell lymphoma. Mol Cancer Ther 4:13–21PubMed Mohammad RM, Wang S, Aboukameel A et al (2005) Preclinical studies of a nonpeptidic small-molecule inhibitor of Bcl-2 and Bcl-xL [(-)-gossypol] against diffuse large cell lymphoma. Mol Cancer Ther 4:13–21PubMed
26.
Zurück zum Zitat Stel AJ, Ten Cate B, Jacobs S et al (2007) Fas receptor clustering and involvement of the death receptor pathway in rituximab-mediated apoptosis with concomitant sensitization of lymphoma B cells to fas-induced apoptosis. J Immunol 178:2287–2295PubMed Stel AJ, Ten Cate B, Jacobs S et al (2007) Fas receptor clustering and involvement of the death receptor pathway in rituximab-mediated apoptosis with concomitant sensitization of lymphoma B cells to fas-induced apoptosis. J Immunol 178:2287–2295PubMed
27.
Zurück zum Zitat Chou TC, Talalay P (1984) Quantitative analysis of dose-effect relationships: the combined effects of multiple drugs or enzyme inhibitors. Adv Enzyme Regul 22:27–55CrossRefPubMed Chou TC, Talalay P (1984) Quantitative analysis of dose-effect relationships: the combined effects of multiple drugs or enzyme inhibitors. Adv Enzyme Regul 22:27–55CrossRefPubMed
28.
Zurück zum Zitat Shoemaker AR, Oleksijew A, Bauch J et al (2006) A small-molecule inhibitor of Bcl-xL potentiates the activity of cytotoxic drugs in vitro and in vivo. Cancer Res 66:8731–8739CrossRefPubMed Shoemaker AR, Oleksijew A, Bauch J et al (2006) A small-molecule inhibitor of Bcl-xL potentiates the activity of cytotoxic drugs in vitro and in vivo. Cancer Res 66:8731–8739CrossRefPubMed
30.
Zurück zum Zitat Mohammad RM, Al-Katib A, Aboukameel A, Doerge DR, Sarkar F, Kucuk O (2003) Genistein sensitizes diffuse large cell lymphoma to CHOP (cyclophosphamide, doxorubicin, vincristine, prednisone) chemotherapy. Mol Cancer Ther 2:1361–1368PubMed Mohammad RM, Al-Katib A, Aboukameel A, Doerge DR, Sarkar F, Kucuk O (2003) Genistein sensitizes diffuse large cell lymphoma to CHOP (cyclophosphamide, doxorubicin, vincristine, prednisone) chemotherapy. Mol Cancer Ther 2:1361–1368PubMed
32.
Zurück zum Zitat Tahir SK, Yang X, Anderson MG et al (2007) Influence of Bcl-2 family members on the cellular response of small-cell lung cancer cell lines to ABT-737. Cancer Res 67:1176–1183CrossRefPubMed Tahir SK, Yang X, Anderson MG et al (2007) Influence of Bcl-2 family members on the cellular response of small-cell lung cancer cell lines to ABT-737. Cancer Res 67:1176–1183CrossRefPubMed
33.
Zurück zum Zitat Lin X, Morgan-Lappe S, Huang X et al (2007) ‘Seed’ analysis of off-target siRNAs reveals an essential role of Mcl-1 in resistance to the small-molecule Bcl-2/Bcl-xL inhibitor ABT-737. Oncogene 26:3972–3979CrossRefPubMed Lin X, Morgan-Lappe S, Huang X et al (2007) ‘Seed’ analysis of off-target siRNAs reveals an essential role of Mcl-1 in resistance to the small-molecule Bcl-2/Bcl-xL inhibitor ABT-737. Oncogene 26:3972–3979CrossRefPubMed
34.
Zurück zum Zitat Konopleva M, Contractor R, Tsao T et al (2006) Mechanisms of apoptosis sensitivity and resistance to the BH3 mimetic ABT-737 in acute myeloid leukemia. Cancer Cell 10:375–388CrossRefPubMed Konopleva M, Contractor R, Tsao T et al (2006) Mechanisms of apoptosis sensitivity and resistance to the BH3 mimetic ABT-737 in acute myeloid leukemia. Cancer Cell 10:375–388CrossRefPubMed
35.
Zurück zum Zitat van Delft MF, Wei AH, Mason KD et al (2006) The BH3 mimetic ABT-737 targets selective Bcl-2 proteins and efficiently induces apoptosis via Bak/Bax if Mcl-1 is neutralized. Cancer Cell 10:389–399CrossRefPubMed van Delft MF, Wei AH, Mason KD et al (2006) The BH3 mimetic ABT-737 targets selective Bcl-2 proteins and efficiently induces apoptosis via Bak/Bax if Mcl-1 is neutralized. Cancer Cell 10:389–399CrossRefPubMed
36.
Zurück zum Zitat Mandelin AM II, Pope RM (2007) Myeloid cell leukemia-1 as a therapeutic target. Expert Opin Ther Targets 11:363–373CrossRefPubMed Mandelin AM II, Pope RM (2007) Myeloid cell leukemia-1 as a therapeutic target. Expert Opin Ther Targets 11:363–373CrossRefPubMed
37.
Zurück zum Zitat Kutuk O, Arisan ED, Tezil T, Shoshan MC, Basaga H (2009) Cisplatin overcomes Bcl-2-mediated resistance to apoptosis via preferential engagement of Bak: critical role of Noxa-mediated lipid peroxidation. Carcinogenesis 30:1517–1527CrossRefPubMed Kutuk O, Arisan ED, Tezil T, Shoshan MC, Basaga H (2009) Cisplatin overcomes Bcl-2-mediated resistance to apoptosis via preferential engagement of Bak: critical role of Noxa-mediated lipid peroxidation. Carcinogenesis 30:1517–1527CrossRefPubMed
38.
Zurück zum Zitat Olejniczak SH, Hernandez-Ilizaliturri FJ, Clements JL, Czuczman MS (2008) Acquired resistance to rituximab is associated with chemotherapy resistance resulting from decreased Bax and Bak expression. Clin Cancer Res 14:1550–1560CrossRefPubMed Olejniczak SH, Hernandez-Ilizaliturri FJ, Clements JL, Czuczman MS (2008) Acquired resistance to rituximab is associated with chemotherapy resistance resulting from decreased Bax and Bak expression. Clin Cancer Res 14:1550–1560CrossRefPubMed
39.
Zurück zum Zitat Jazirehi AR, Vega MI, Bonavida B (2007) Development of rituximab-resistant lymphoma clones with altered cell signaling and cross-resistance to chemotherapy. Cancer Res 67:1270–1281CrossRefPubMed Jazirehi AR, Vega MI, Bonavida B (2007) Development of rituximab-resistant lymphoma clones with altered cell signaling and cross-resistance to chemotherapy. Cancer Res 67:1270–1281CrossRefPubMed
40.
Zurück zum Zitat Wobser M, Voigt H, Eggert AO et al (2007) Bcl-2 expression in rituximab refractory cutaneous B-cell lymphoma. Br J Cancer 96:1540–1543CrossRefPubMed Wobser M, Voigt H, Eggert AO et al (2007) Bcl-2 expression in rituximab refractory cutaneous B-cell lymphoma. Br J Cancer 96:1540–1543CrossRefPubMed
41.
Zurück zum Zitat Mohammad RM, Wall NR, Dutcher JA, Al-Katib AM (2000) The addition of bryostatin 1 to cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP) chemotherapy improves response in a CHOP-resistant human diffuse large cell lymphoma xenograft model. Clin Cancer Res 6:4950–4956PubMed Mohammad RM, Wall NR, Dutcher JA, Al-Katib AM (2000) The addition of bryostatin 1 to cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP) chemotherapy improves response in a CHOP-resistant human diffuse large cell lymphoma xenograft model. Clin Cancer Res 6:4950–4956PubMed
42.
Zurück zum Zitat Reed JC, Kitada S, Takayama S, Miyashita T (1994) Regulation of chemoresistance by the Bcl-2 oncoprotein in non-Hodgkin’s lymphoma and lymphocytic leukemia cell lines. Ann Oncol 5(Suppl 1):61–65PubMed Reed JC, Kitada S, Takayama S, Miyashita T (1994) Regulation of chemoresistance by the Bcl-2 oncoprotein in non-Hodgkin’s lymphoma and lymphocytic leukemia cell lines. Ann Oncol 5(Suppl 1):61–65PubMed
43.
Zurück zum Zitat Minn AJ, Rudin CM, Boise LH, Thompson CB (1995) Expression of Bcl-xL can confer a multidrug resistance phenotype. Blood 86:1903–1910PubMed Minn AJ, Rudin CM, Boise LH, Thompson CB (1995) Expression of Bcl-xL can confer a multidrug resistance phenotype. Blood 86:1903–1910PubMed
44.
Zurück zum Zitat Tu Y, Xu FH, Liu J et al (1996) Upregulated expression of BCL-2 in multiple myeloma cells induced by exposure to doxorubicin, etoposide, and hydrogen peroxide. Blood 88:1805–1812PubMed Tu Y, Xu FH, Liu J et al (1996) Upregulated expression of BCL-2 in multiple myeloma cells induced by exposure to doxorubicin, etoposide, and hydrogen peroxide. Blood 88:1805–1812PubMed
Metadaten
Titel
The Bcl-2 inhibitor ABT-263 enhances the response of multiple chemotherapeutic regimens in hematologic tumors in vivo
verfasst von
Scott Ackler
Michael J. Mitten
Kelly Foster
Anatol Oleksijew
Marion Refici
Stephen K. Tahir
Yu Xiao
Christin Tse
David J. Frost
Stephen W. Fesik
Saul H. Rosenberg
Steven W. Elmore
Alexander R. Shoemaker
Publikationsdatum
01.10.2010
Verlag
Springer-Verlag
Erschienen in
Cancer Chemotherapy and Pharmacology / Ausgabe 5/2010
Print ISSN: 0344-5704
Elektronische ISSN: 1432-0843
DOI
https://doi.org/10.1007/s00280-009-1232-1

Weitere Artikel der Ausgabe 5/2010

Cancer Chemotherapy and Pharmacology 5/2010 Zur Ausgabe

Mehr Lebenszeit mit Abemaciclib bei fortgeschrittenem Brustkrebs?

24.05.2024 Mammakarzinom Nachrichten

In der MONARCHE-3-Studie lebten Frauen mit fortgeschrittenem Hormonrezeptor-positivem, HER2-negativem Brustkrebs länger, wenn sie zusätzlich zu einem nicht steroidalen Aromatasehemmer mit Abemaciclib behandelt wurden; allerdings verfehlte der numerische Zugewinn die statistische Signifikanz.

ADT zur Radiatio nach Prostatektomie: Wenn, dann wohl länger

24.05.2024 Prostatakarzinom Nachrichten

Welchen Nutzen es trägt, wenn die Strahlentherapie nach radikaler Prostatektomie um eine Androgendeprivation ergänzt wird, hat die RADICALS-HD-Studie untersucht. Nun liegen die Ergebnisse vor. Sie sprechen für länger dauernden Hormonentzug.

Das sind die führenden Symptome junger Darmkrebspatienten

Darmkrebserkrankungen in jüngeren Jahren sind ein zunehmendes Problem, das häufig längere Zeit übersehen wird, gerade weil die Patienten noch nicht alt sind. Welche Anzeichen Ärzte stutzig machen sollten, hat eine Metaanalyse herausgearbeitet.

„Überwältigende“ Evidenz für Tripeltherapie beim metastasierten Prostata-Ca.

22.05.2024 Prostatakarzinom Nachrichten

Patienten mit metastasiertem hormonsensitivem Prostatakarzinom sollten nicht mehr mit einer alleinigen Androgendeprivationstherapie (ADT) behandelt werden, mahnt ein US-Team nach Sichtung der aktuellen Datenlage. Mit einer Tripeltherapie haben die Betroffenen offenbar die besten Überlebenschancen.

Update Onkologie

Bestellen Sie unseren Fach-Newsletter und bleiben Sie gut informiert.