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Heredia-Guerrero SC, Evers M, Keppler S, Schwarzfischer M, Fuhr V, Rauert-Wunderlich H, Krügl A, Nedeva T, Grieb T, Pickert J, Koch H, Steinbrunn T, Bayrhof OJ, Bargou RC, Rosenwald A, Stühmer T, Leich E. Functional Investigation of IGF1R Mutations in Multiple Myeloma. Cancers (Basel) 2024; 16:2139. [PMID: 38893258 PMCID: PMC11171363 DOI: 10.3390/cancers16112139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2024] [Revised: 05/22/2024] [Accepted: 05/22/2024] [Indexed: 06/21/2024] Open
Abstract
High expression of the receptor tyrosine kinase (RTK) insulin-like growth factor-1 receptor (IGF1R) and RTK mutations are associated with high-risk/worse prognosis in multiple myeloma (MM). Combining the pIGF1R/pINSR inhibitor linsitinib with the proteasome inhibitor (PI) bortezomib seemed promising in a clinical trial, but IGF1R expression was not associated with therapy response. Because the oncogenic impact of IGF1R mutations is so far unknown, we investigated the functional impact of IGF1R mutations on survival signaling, viability/proliferation and survival response to therapy. We transfected four human myeloma cell lines (HMCLs) with IGF1RWT, IGF1RD1146N and IGF1RN1129S (Sleeping Beauty), generated CRISPR-Cas9 IGF1R knockouts in the HMCLs U-266 (IGF1RWT) and L-363 (IGF1RD1146N) and tested the anti-MM activity of linsitinib alone and in combination with the second-generation PI carfilzomib in seven HMCLs. IGF1R knockout entailed reduced proliferation. Upon IGF1R overexpression, survival signaling was moderately increased in all HCMLs and slightly affected by IGF1RN1129S in one HMCL, whereby the viability remained unaffected. Expression of IGF1RD1146N reduced pIGF1R-Y1135, especially under serum reduction, but did not impact downstream signaling. Linsitinib and carfilzomib showed enhanced anti-myeloma activity in six out of seven HMCL irrespective of the IGF1R mutation status. In conclusion, IGF1R mutations can impact IGF1R activation and/or downstream signaling, and a combination of linsitinib with carfilzomib might be a suitable therapeutic approach for MM patients potentially responsive to IGF1R blockade.
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Affiliation(s)
| | - Marietheres Evers
- Institute of Pathology, University of Würzburg, 97080 Würzburg, Germany (M.E.); (H.R.-W.); (A.K.); (T.N.); (T.G.); (A.R.)
| | - Sarah Keppler
- Institute of Pathology, University of Würzburg, 97080 Würzburg, Germany (M.E.); (H.R.-W.); (A.K.); (T.N.); (T.G.); (A.R.)
| | - Marlene Schwarzfischer
- Institute of Pathology, University of Würzburg, 97080 Würzburg, Germany (M.E.); (H.R.-W.); (A.K.); (T.N.); (T.G.); (A.R.)
| | - Viktoria Fuhr
- Institute of Pathology, University of Würzburg, 97080 Würzburg, Germany (M.E.); (H.R.-W.); (A.K.); (T.N.); (T.G.); (A.R.)
| | - Hilka Rauert-Wunderlich
- Institute of Pathology, University of Würzburg, 97080 Würzburg, Germany (M.E.); (H.R.-W.); (A.K.); (T.N.); (T.G.); (A.R.)
| | - Anne Krügl
- Institute of Pathology, University of Würzburg, 97080 Würzburg, Germany (M.E.); (H.R.-W.); (A.K.); (T.N.); (T.G.); (A.R.)
| | - Theodora Nedeva
- Institute of Pathology, University of Würzburg, 97080 Würzburg, Germany (M.E.); (H.R.-W.); (A.K.); (T.N.); (T.G.); (A.R.)
| | - Tina Grieb
- Institute of Pathology, University of Würzburg, 97080 Würzburg, Germany (M.E.); (H.R.-W.); (A.K.); (T.N.); (T.G.); (A.R.)
| | - Julia Pickert
- Institute of Pathology, University of Würzburg, 97080 Würzburg, Germany (M.E.); (H.R.-W.); (A.K.); (T.N.); (T.G.); (A.R.)
| | - Hanna Koch
- Institute of Pathology, University of Würzburg, 97080 Würzburg, Germany (M.E.); (H.R.-W.); (A.K.); (T.N.); (T.G.); (A.R.)
| | - Torsten Steinbrunn
- Department of Internal Medicine II, University Hospital Würzburg, 97080 Würzburg, Germany;
- Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Otto-Jonas Bayrhof
- Comprehensive Cancer Center Mainfranken, University Hospital Würzburg, 97080 Würzburg, Germany (R.C.B.); (T.S.)
| | - Ralf Christian Bargou
- Comprehensive Cancer Center Mainfranken, University Hospital Würzburg, 97080 Würzburg, Germany (R.C.B.); (T.S.)
| | - Andreas Rosenwald
- Institute of Pathology, University of Würzburg, 97080 Würzburg, Germany (M.E.); (H.R.-W.); (A.K.); (T.N.); (T.G.); (A.R.)
| | - Thorsten Stühmer
- Comprehensive Cancer Center Mainfranken, University Hospital Würzburg, 97080 Würzburg, Germany (R.C.B.); (T.S.)
| | - Ellen Leich
- Institute of Pathology, University of Würzburg, 97080 Würzburg, Germany (M.E.); (H.R.-W.); (A.K.); (T.N.); (T.G.); (A.R.)
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Exon-4 Mutations in KRAS Affect MEK/ERK and PI3K/AKT Signaling in Human Multiple Myeloma Cell Lines. Cancers (Basel) 2020; 12:cancers12020455. [PMID: 32079091 PMCID: PMC7072554 DOI: 10.3390/cancers12020455] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 02/04/2020] [Accepted: 02/13/2020] [Indexed: 01/12/2023] Open
Abstract
Approximately 20% of multiple myeloma (MM) cases harbor a point mutation in KRAS. However, there is still no final consent on whether KRAS-mutations are associated with disease outcome. Specifically, no data exist on whether KRAS-mutations have an impact on survival of MM patients at diagnosis in the era of novel agents. Direct blockade of KRAS for therapeutic purposes is mostly impossible, but recently a mutation-specific covalent inhibitor targeting KRASp.G12C entered into clinical trials. However, other KRAS hotspot-mutations exist in MM patients, including the less common exon-4 mutations. For the current study, the coding regions of KRAS were deep-sequenced in 80 newly diagnosed MM patients, uniformely treated with three cycles of bortezomib plus dexamethasone and cyclophosphamide (VCD)-induction, followed by high-dose chemotherapy and autologous stem cell transplantation. Moreover, the functional impact of KRASp.G12A and the exon-4 mutations p.A146T and p.A146V on different survival pathways was investigated. Specifically, KRASWT, KRASp.G12A, KRASp.A146T, and KRASp.A146V were overexpressed in HEK293 cells and the KRASWT MM cell lines JJN3 and OPM2 using lentiviral transduction and the Sleeping Beauty vector system. Even though KRAS-mutations were not correlated with survival, all KRAS-mutants were found capable of potentially activating MEK/ERK- and sustaining PI3K/AKT-signaling in MM cells.
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Garrett SM, Hsu E, Thomas JM, Pilewski JM, Feghali-Bostwick C. Insulin-like growth factor (IGF)-II- mediated fibrosis in pathogenic lung conditions. PLoS One 2019; 14:e0225422. [PMID: 31765403 PMCID: PMC6876936 DOI: 10.1371/journal.pone.0225422] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 11/05/2019] [Indexed: 12/28/2022] Open
Abstract
Type 2 insulin-like growth factor (IGF-II) levels are increased in fibrosing lung diseases such as idiopathic pulmonary fibrosis (IPF) and scleroderma/systemic sclerosis-associated pulmonary fibrosis (SSc). Our goal was to investigate the contribution of IGF receptors to IGF-II-mediated fibrosis in these diseases and identify other potential mechanisms key to the fibrotic process. Cognate receptor gene and protein expression were analyzed with qRT-PCR and immunoblot in primary fibroblasts derived from lung tissues of normal donors (NL) and patients with IPF or SSc. Compared to NL, steady-state receptor gene expression was decreased in SSc but not in IPF. IGF-II stimulation differentially decreased receptor mRNA and protein levels in NL, IPF, and SSc fibroblasts. Neutralizing antibody, siRNA, and receptor inhibition targeting endogenous IGF-II and its primary receptors, type 1 IGF receptor (IGF1R), IGF2R, and insulin receptor (IR) resulted in loss of the IGF-II response. IGF-II tipped the TIMP:MMP balance, promoting a fibrotic environment both intracellularly and extracellularly. Differentiation of fibroblasts into myofibroblasts by IGF-II was blocked with a TGFβ1 receptor inhibitor. IGF-II also increased TGFβ2 and TGFβ3 expression, with subsequent activation of canonical SMAD2/3 signaling. Therefore, IGF-II promoted fibrosis through IGF1R, IR, and IGF1R/IR, differentiated fibroblasts into myofibroblasts, decreased protease production and extracellular matrix degradation, and stimulated expression of two TGFβ isoforms, suggesting that IGF-II exerts pro-fibrotic effects via multiple mechanisms.
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Affiliation(s)
- Sara M. Garrett
- Division of Rheumatology, Department of Medicine, Medical University of South Carolina (MUSC), Charleston, South Carolina, United States of America
| | - Eileen Hsu
- Mid Atlantic Permanente Medical Group, Mclean, Virginia, United States of America
| | - Justin M. Thomas
- Eisenhower Medical Center, Rancho Mirage, California, United States of America
| | - Joseph M. Pilewski
- Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Carol Feghali-Bostwick
- Division of Rheumatology, Department of Medicine, Medical University of South Carolina (MUSC), Charleston, South Carolina, United States of America
- * E-mail:
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