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Bromberger S, Zadorozhna Y, Ressler JM, Holzner S, Nawrocki A, Zila N, Springer A, Røssel Larsen M, Schossleitner K. Off-targets of BRAF inhibitors disrupt endothelial signaling and vascular barrier function. Life Sci Alliance 2024; 7:e202402671. [PMID: 38839106 PMCID: PMC11153892 DOI: 10.26508/lsa.202402671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 05/17/2024] [Accepted: 05/20/2024] [Indexed: 06/07/2024] Open
Abstract
Targeted therapies against mutant BRAF are effectively used in combination with MEK inhibitors (MEKi) to treat advanced melanoma. However, treatment success is affected by resistance and adverse events (AEs). Approved BRAF inhibitors (BRAFi) show high levels of target promiscuity, which can contribute to these effects. The blood vessel lining is in direct contact with high plasma concentrations of BRAFi, but effects of the inhibitors in this cell type are unknown. Hence, we aimed to characterize responses to approved BRAFi for melanoma in the vascular endothelium. We showed that clinically approved BRAFi induced a paradoxical activation of endothelial MAPK signaling. Moreover, phosphoproteomics revealed distinct sets of off-targets per inhibitor. Endothelial barrier function and junction integrity were impaired upon treatment with vemurafenib and the next-generation dimerization inhibitor PLX8394, but not with dabrafenib or encorafenib. Together, these findings provide insights into the surprisingly distinct side effects of BRAFi on endothelial signaling and functionality. Better understanding of off-target effects could help to identify molecular mechanisms behind AEs and guide the continued development of therapies for BRAF-mutant melanoma.
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Affiliation(s)
- Sophie Bromberger
- https://ror.org/05n3x4p02 Department of Dermatology, Medical University of Vienna, Vienna, Austria
| | - Yuliia Zadorozhna
- https://ror.org/05n3x4p02 Department of Dermatology, Medical University of Vienna, Vienna, Austria
| | - Julia Maria Ressler
- https://ror.org/05n3x4p02 Department of Dermatology, Medical University of Vienna, Vienna, Austria
| | - Silvio Holzner
- https://ror.org/05n3x4p02 Department of Dermatology, Medical University of Vienna, Vienna, Austria
| | - Arkadiusz Nawrocki
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - Nina Zila
- https://ror.org/05n3x4p02 Department of Dermatology, Medical University of Vienna, Vienna, Austria
- University of Applied Sciences FH Campus Wien, Division of Biomedical Science, Vienna, Austria
| | - Alexander Springer
- https://ror.org/05n3x4p02 Department of Pediatric Surgery, Medical University of Vienna, Vienna, Austria
| | - Martin Røssel Larsen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - Klaudia Schossleitner
- https://ror.org/05n3x4p02 Department of Dermatology, Medical University of Vienna, Vienna, Austria
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2
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Cavallo MR, Yo JC, Gallant KC, Cunanan CJ, Amirfallah A, Daniali M, Sanders AB, Aplin AE, Pribitkin EA, Hartsough EJ. Mcl-1 mediates intrinsic resistance to RAF inhibitors in mutant BRAF papillary thyroid carcinoma. Cell Death Discov 2024; 10:175. [PMID: 38622136 PMCID: PMC11018618 DOI: 10.1038/s41420-024-01945-0] [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: 04/03/2023] [Revised: 03/29/2024] [Accepted: 04/05/2024] [Indexed: 04/17/2024] Open
Abstract
Papillary thyroid carcinoma (PTC) is the most frequent form of thyroid cancer. PTC commonly presents with mutations of the serine/threonine kinase BRAF (BRAFV600E), which drive ERK1/2 pathway activation to support growth and suppress apoptosis. PTC patients often undergo surgical resection; however, since the average age of PTC patients is under 50, adverse effects associated with prolonged maintenance therapy following total thyroidectomy are a concern. The development of mutant-selective BRAF inhibitors (BRAFi), like vemurafenib, has been efficacious in patients with metastatic melanoma, but the response rate is low for mutant BRAF PTC patients. Here, we assay the therapeutic response of BRAFi in a panel of human PTC cell lines and freshly biopsied patient samples. We observed heterogeneous responses to BRAFi, and multi-omic comparisons between susceptible and resistant mutant BRAF PTC revealed overrepresented stress response pathways and the absence of compensatory RTK activation - features that may underpin innate resistance. Importantly, resistant cell lines and patient samples had increased hallmarks of failed apoptosis; a cellular state defined by sublethal caspase activation and DNA damage. Further analysis suggests that the failed apoptotic phenotypes may have features of "minority mitochondrial outer membrane permeabilization (MOMP)" - a stress-related response characterized by fragmented and porous mitochondria known to contribute to cancer aggressiveness. We found that cells presenting with minority MOMP-like phenotypes are dependent on the apoptotic regulator, Mcl-1, as treatment with the Mcl-1 inhibitor, AZD5991, potently induced cell death in resistant cells. Furthermore, PI3K/AKT inhibitors sensitized resistant cells to BRAFi; an effect that was at least in part associated with reduced Mcl-1 levels. Together, these data implicate minority MOMP as a mechanism associated with intrinsic drug resistance and underscore the benefits of targeting Mcl-1 in mutant BRAF PTC.
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Affiliation(s)
- Maria R Cavallo
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Jacob C Yo
- Graduate School of Biomedical Sciences and Professional Studies, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Kayla C Gallant
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Camille J Cunanan
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Amirali Amirfallah
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Marzieh Daniali
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Alyssa B Sanders
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, 19102, USA
| | - Andrew E Aplin
- Sidney Kimmel Cancer Center, Philadelphia, PA, 19107, USA
- Departments of Pharmacology, Physiology and Cancer Biology, Thomas Jefferson University, Philadelphia, PA, 19107, USA
| | - Edmund A Pribitkin
- Departments of Otolargynology-Head & Neck Surgery, Thomas Jefferson University, Philadelphia, PA, 19107, USA
| | - Edward J Hartsough
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, PA, 19102, USA.
- Sidney Kimmel Cancer Center, Philadelphia, PA, 19107, USA.
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3
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Chen W, Geng D, Chen J, Han X, Xie Q, Guo G, Chen X, Zhang W, Tang S, Zhong X. Roles and mechanisms of aberrant alternative splicing in melanoma - implications for targeted therapy and immunotherapy resistance. Cancer Cell Int 2024; 24:101. [PMID: 38462618 PMCID: PMC10926661 DOI: 10.1186/s12935-024-03280-x] [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: 10/29/2023] [Accepted: 02/22/2024] [Indexed: 03/12/2024] Open
Abstract
BACKGROUND Despite advances in therapeutic strategies, resistance to immunotherapy and the off-target effects of targeted therapy have significantly weakened the benefits for patients with melanoma. MAIN BODY Alternative splicing plays a crucial role in transcriptional reprogramming during melanoma development. In particular, aberrant alternative splicing is involved in the efficacy of immunotherapy, targeted therapy, and melanoma metastasis. Abnormal expression of splicing factors and variants may serve as biomarkers or therapeutic targets for the diagnosis and prognosis of melanoma. Therefore, comprehensively integrating their roles and related mechanisms is essential. This review provides the first detailed summary of the splicing process in melanoma and the changes occurring in this pathway. CONCLUSION The focus of this review is to provide strategies for developing novel diagnostic biomarkers and summarize their potential to alter resistance to targeted therapies and immunotherapy.
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Affiliation(s)
- Wanxian Chen
- Department of Plastic and Burns Surgery, The Second Affiliated Hospital of Shantou University Medical College, Shantou, 515000, P. R. China
- Plastic Surgery Research Institute, Ear Deformities Treatment Center and Cleft Lip and Palate Treatment Center, Shantou University Medical College, Shantou, China
| | - Deyi Geng
- Department of Plastic and Burns Surgery, The Second Affiliated Hospital of Shantou University Medical College, Shantou, 515000, P. R. China
- Plastic Surgery Research Institute, Ear Deformities Treatment Center and Cleft Lip and Palate Treatment Center, Shantou University Medical College, Shantou, China
| | - Jiasheng Chen
- Department of Plastic and Burns Surgery, The Second Affiliated Hospital of Shantou University Medical College, Shantou, 515000, P. R. China
- Plastic Surgery Research Institute, Ear Deformities Treatment Center and Cleft Lip and Palate Treatment Center, Shantou University Medical College, Shantou, China
| | - Xiaosha Han
- Department of Plastic and Burns Surgery, The Second Affiliated Hospital of Shantou University Medical College, Shantou, 515000, P. R. China
- Plastic Surgery Research Institute, Ear Deformities Treatment Center and Cleft Lip and Palate Treatment Center, Shantou University Medical College, Shantou, China
| | - Qihu Xie
- Department of Plastic and Burns Surgery, The Second Affiliated Hospital of Shantou University Medical College, Shantou, 515000, P. R. China
- Plastic Surgery Research Institute, Ear Deformities Treatment Center and Cleft Lip and Palate Treatment Center, Shantou University Medical College, Shantou, China
| | - Genghong Guo
- Department of Plastic and Burns Surgery, The Second Affiliated Hospital of Shantou University Medical College, Shantou, 515000, P. R. China
- Plastic Surgery Research Institute, Ear Deformities Treatment Center and Cleft Lip and Palate Treatment Center, Shantou University Medical College, Shantou, China
| | - Xuefen Chen
- Department of Plastic and Burns Surgery, The Second Affiliated Hospital of Shantou University Medical College, Shantou, 515000, P. R. China
- Plastic Surgery Research Institute, Ear Deformities Treatment Center and Cleft Lip and Palate Treatment Center, Shantou University Medical College, Shantou, China
| | - Wancong Zhang
- Department of Plastic and Burns Surgery, The Second Affiliated Hospital of Shantou University Medical College, Shantou, 515000, P. R. China
- Plastic Surgery Research Institute, Ear Deformities Treatment Center and Cleft Lip and Palate Treatment Center, Shantou University Medical College, Shantou, China
| | - Shijie Tang
- Department of Plastic and Burns Surgery, The Second Affiliated Hospital of Shantou University Medical College, Shantou, 515000, P. R. China
- Plastic Surgery Research Institute, Ear Deformities Treatment Center and Cleft Lip and Palate Treatment Center, Shantou University Medical College, Shantou, China
| | - Xiaoping Zhong
- Department of Plastic and Burns Surgery, The Second Affiliated Hospital of Shantou University Medical College, Shantou, 515000, P. R. China.
- Plastic Surgery Research Institute, Ear Deformities Treatment Center and Cleft Lip and Palate Treatment Center, Shantou University Medical College, Shantou, China.
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4
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Kozyra P, Pitucha M. Revisiting the Role of B-RAF Kinase as a Therapeutic Target in Melanoma. Curr Med Chem 2024; 31:2003-2020. [PMID: 37855341 DOI: 10.2174/0109298673258495231011065225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 07/19/2023] [Accepted: 08/17/2023] [Indexed: 10/20/2023]
Abstract
Malignant melanoma is the rarest but most aggressive and deadly skin cancer. Melanoma is the result of a malignant transformation of melanocytes, which leads to their uncontrolled proliferation. Mutations in the mitogen-activated protein kinase (MAPK) pathway, which are crucial for the control of cellular processes, such as apoptosis, division, growth, differentiation, and migration, are one of its most common causes. BRAF kinase, as one of the known targets of this pathway, has been known for many years as a prominent molecular target in melanoma therapy, and the following mini-review outlines the state-of-the-art knowledge regarding its structure, mutations and mechanisms.
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Affiliation(s)
- Paweł Kozyra
- Independent Radiopharmacy Unit, Faculty of Pharmacy, Medical University of Lublin, Lublin, PL, 20093, Poland
| | - Monika Pitucha
- Independent Radiopharmacy Unit, Faculty of Pharmacy, Medical University of Lublin, Lublin, PL-20093, Poland
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5
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Siljamäki E, Riihilä P, Suwal U, Nissinen L, Rappu P, Kallajoki M, Kähäri VM, Heino J. Inhibition of TGF-β signaling, invasion, and growth of cutaneous squamous cell carcinoma by PLX8394. Oncogene 2023; 42:3633-3647. [PMID: 37864034 PMCID: PMC10691969 DOI: 10.1038/s41388-023-02863-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 09/28/2023] [Accepted: 10/04/2023] [Indexed: 10/22/2023]
Abstract
Cutaneous squamous cell carcinoma (cSCC) is the most common metastatic skin cancer. The prognosis of patients with metastatic cSCC is poor emphasizing the need for new therapies. We have previously reported that the activation of Ras/MEK/ERK1/2 and transforming growth factor β (TGF-β)/Smad2 signaling in transformed keratinocytes and cSCC cells leads to increased accumulation of laminin-332 and accelerated invasion. Here, we show that the next-generation B-Raf inhibitor PLX8394 blocks TGF-β signaling in ras-transformed metastatic epidermal keratinocytes (RT3 cells) harboring wild-type B-Raf and hyperactive Ras. PLX8394 decreased phosphorylation of TGF-β receptor II and Smad2, as well as p38 activity, MMP-1 and MMP-13 synthesis, and laminin-332 accumulation. PLX8394 significantly inhibited the growth of human cSCC tumors and in vivo collagen degradation in xenograft model. In conclusion, our data indicate that PLX8394 inhibits several serine-threonine kinases in malignantly transformed human keratinocytes and cSCC cells and inhibits cSCC invasion and tumor growth in vitro and in vivo. We identify PLX8394 as a potential therapeutic compound for advanced human cSCC.
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Affiliation(s)
- Elina Siljamäki
- MediCity Research Laboratory, University of Turku, Tykistökatu 6A, FI-20520, Turku, Finland
- Department of Life Technologies and InFLAMES Research Flagship, University of Turku, FI-20014, Turku, Finland
| | - Pilvi Riihilä
- Department of Dermatology, University of Turku and Turku University Hospital, Hämeentie 11 TE6, FI-20520, Turku, Finland
- FICAN West Cancer Research Laboratory, University of Turku and Turku University Hospital, Kiinamyllynkatu 10, FI-20520, Turku, Finland
| | - Ujjwal Suwal
- MediCity Research Laboratory, University of Turku, Tykistökatu 6A, FI-20520, Turku, Finland
- Department of Life Technologies and InFLAMES Research Flagship, University of Turku, FI-20014, Turku, Finland
| | - Liisa Nissinen
- Department of Dermatology, University of Turku and Turku University Hospital, Hämeentie 11 TE6, FI-20520, Turku, Finland
- FICAN West Cancer Research Laboratory, University of Turku and Turku University Hospital, Kiinamyllynkatu 10, FI-20520, Turku, Finland
| | - Pekka Rappu
- MediCity Research Laboratory, University of Turku, Tykistökatu 6A, FI-20520, Turku, Finland
- Department of Life Technologies and InFLAMES Research Flagship, University of Turku, FI-20014, Turku, Finland
| | - Markku Kallajoki
- Department of Pathology, University of Turku and Turku University Hospital, Kiinamyllynkatu 10, FI-20520, Turku, Finland
| | - Veli-Matti Kähäri
- Department of Dermatology, University of Turku and Turku University Hospital, Hämeentie 11 TE6, FI-20520, Turku, Finland.
- FICAN West Cancer Research Laboratory, University of Turku and Turku University Hospital, Kiinamyllynkatu 10, FI-20520, Turku, Finland.
| | - Jyrki Heino
- MediCity Research Laboratory, University of Turku, Tykistökatu 6A, FI-20520, Turku, Finland.
- Department of Life Technologies and InFLAMES Research Flagship, University of Turku, FI-20014, Turku, Finland.
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6
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Elhariri A, Alhaj A, Ahn D, Sonbol MB, Bekaii-Saab T, Wu C, Rutenberg MS, Stauffer J, Starr J, Majeed U, Jones J, Borad M, Babiker H. Targeting KRAS in pancreatic adenocarcinoma: Progress in demystifying the holy grail. World J Clin Oncol 2023; 14:285-296. [PMID: 37700806 PMCID: PMC10494558 DOI: 10.5306/wjco.v14.i8.285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 07/05/2023] [Accepted: 07/27/2023] [Indexed: 08/22/2023] Open
Abstract
Pancreatic cancer (PC) remains one of the most challenging diseases, with a very poor 5-year overall survival of around 11.5%. Kirsten rat sarcoma virus (KRAS) mutation is seen in 90%-95% of PC patients and plays an important role in cancer cell proliferation, differentiation, metabolism, and survival, making it an essential mutation for targeted therapy. Despite extensive efforts in studying this oncogene, there has been little success in finding a drug to target this pathway, labelling it for decades as "undruggable". In this article we summarize some of the efforts made to target the KRAS pathway in PC, discuss the challenges, and shed light on promising clinical trials.
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Affiliation(s)
- Ahmed Elhariri
- Division of Hematology-Oncology, Department of Medicine, Mayo Clinic Florida, Mayo Clinic Cancer Center, Jacksonville, FL 32224, United States
| | - Ahmed Alhaj
- Division of Hematology-Oncology, Department of Medicine, Mayo Clinic Florida, Mayo Clinic Cancer Center, Jacksonville, FL 32224, United States
| | - Daniel Ahn
- Division of Hematology-Oncology, Department of Medicine, Mayo Clinic Arizona, Mayo Clinic Cancer Center, Phoenix, AZ 85054, United States
| | - Mohamad Bassam Sonbol
- Division of Hematology-Oncology, Department of Medicine, Mayo Clinic Arizona, Mayo Clinic Cancer Center, Phoenix, AZ 85054, United States
| | - Tanios Bekaii-Saab
- Division of Hematology-Oncology, Department of Medicine, Mayo Clinic Arizona, Mayo Clinic Cancer Center, Phoenix, AZ 85054, United States
| | - Christina Wu
- Division of Hematology-Oncology, Department of Medicine, Mayo Clinic Arizona, Mayo Clinic Cancer Center, Phoenix, AZ 85054, United States
| | - Michael Scott Rutenberg
- Department of Radiation-Oncology, Mayo Clinic Florida, Mayo Clinic Cancer Center, Jacksonville, FL 32224, United States
| | - John Stauffer
- Department of Surgical Oncology, Hepatopancreatobiliary Surgery, Mayo Clinic Florida, Jacksonville, FL 32224, United States
| | - Jason Starr
- Division of Hematology-Oncology, Department of Medicine, Mayo Clinic Florida, Mayo Clinic Cancer Center, Jacksonville, FL 32224, United States
| | - Umair Majeed
- Division of Hematology-Oncology, Department of Medicine, Mayo Clinic Florida, Mayo Clinic Cancer Center, Jacksonville, FL 32224, United States
| | - Jeremy Jones
- Division of Hematology-Oncology, Department of Medicine, Mayo Clinic Florida, Mayo Clinic Cancer Center, Jacksonville, FL 32224, United States
| | - Mitesh Borad
- Division of Hematology-Oncology, Department of Medicine, Mayo Clinic Arizona, Mayo Clinic Cancer Center, Phoenix, AZ 85054, United States
| | - Hani Babiker
- Division of Hematology-Oncology, Department of Medicine, Mayo Clinic Florida, Mayo Clinic Cancer Center, Jacksonville, FL 32224, United States
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7
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Singh A, Sonawane P, Kumar A, Singh H, Naumovich V, Pathak P, Grishina M, Khalilullah H, Jaremko M, Emwas AH, Verma A, Kumar P. Challenges and Opportunities in the Crusade of BRAF Inhibitors: From 2002 to 2022. ACS OMEGA 2023; 8:27819-27844. [PMID: 37576670 PMCID: PMC10413849 DOI: 10.1021/acsomega.3c00332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 02/27/2023] [Indexed: 08/15/2023]
Abstract
Serine/threonine-protein kinase B-Raf (BRAF; RAF = rapidly accelerated fibrosarcoma) plays an important role in the mitogen-activated protein kinase (MAPK) signaling cascade. Somatic mutations in the BRAF gene were first discovered in 2002 by Davies et al., which was a major breakthrough in cancer research. Subsequently, three different classes of BRAF mutants have been discovered. This class includes class I monomeric mutants (BRAFV600), class II BRAF homodimer mutants (non-V600), and class III BRAF heterodimers (non-V600). Cancers caused by these include melanoma, thyroid cancer, ovarian cancer, colorectal cancer, nonsmall cell lung cancer, and others. In this study, we have highlighted the major binding pockets in BRAF protein, their active and inactive conformations with inhibitors, and BRAF dimerization and its importance in paradoxical activation and BRAF mutation. We have discussed the first-, second-, and third-generation drugs approved by the Food and Drug Administration and drugs under clinical trials with all four different binding approaches with DFG-IN/OUT and αC-IN/OUT for BRAF protein. We have investigated particular aspects and difficulties with all three generations of inhibitors. Finally, this study has also covered recent developments in synthetic BRAF inhibitors (from their discovery in 2002 to 2022), their unique properties, and importance in inhibiting BRAF mutants.
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Affiliation(s)
- Ankit
Kumar Singh
- Department
of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Ghudda, Bathinda 151401, India
| | - Pankaj Sonawane
- Department
of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Ghudda, Bathinda 151401, India
| | - Adarsh Kumar
- Department
of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Ghudda, Bathinda 151401, India
| | - Harshwardhan Singh
- Department
of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Ghudda, Bathinda 151401, India
| | - Vladislav Naumovich
- Laboratory
of Computational Modeling of Drugs, Higher Medical and Biological
School, South Ural State University, Chelyabinsk 454008, Russia
| | - Prateek Pathak
- Laboratory
of Computational Modeling of Drugs, Higher Medical and Biological
School, South Ural State University, Chelyabinsk 454008, Russia
| | - Maria Grishina
- Laboratory
of Computational Modeling of Drugs, Higher Medical and Biological
School, South Ural State University, Chelyabinsk 454008, Russia
| | - Habibullah Khalilullah
- Department
of Pharmaceutical Chemistry and Pharmacognosy, Unaizah College of
Pharmacy, Qassim University, Unayzah 51911, Saudi Arabia
| | - Mariusz Jaremko
- Smart-Health
Initiative and Red Sea Research Center, Division of Biological and
Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Abdul-Hamid Emwas
- Core
Laboratories, King Abdullah University of
Science and Technology, Thuwal 23955-6900, Saudi
Arabia
| | - Amita Verma
- Bioorganic
and Medicinal Chemistry Research Laboratory, Department of Pharmaceutical
Sciences, Sam Higginbottom University of
Agriculture, Technology and Sciences, Prayagraj 211007, India
| | - Pradeep Kumar
- Department
of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Ghudda, Bathinda 151401, India
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8
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BRAF/MEK inhibition in NSCLC: mechanisms of resistance and how to overcome it. CLINICAL & TRANSLATIONAL ONCOLOGY : OFFICIAL PUBLICATION OF THE FEDERATION OF SPANISH ONCOLOGY SOCIETIES AND OF THE NATIONAL CANCER INSTITUTE OF MEXICO 2023; 25:10-20. [PMID: 35729451 DOI: 10.1007/s12094-022-02849-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2022] [Accepted: 04/28/2022] [Indexed: 01/07/2023]
Abstract
Targeted therapy for oncogenic genetic alterations has changed the treatment paradigm of advanced non-small cell lung cancer (NSCLC). Mutations in the BRAF gene are detected in approximately 4% of patients and result in hyper-activation of the MAPK pathway, leading to uncontrolled cellular proliferation. Inhibition of BRAF and its downstream effector MEK constitutes a therapeutic strategy for a subset of patients with NSCLC and is associated with clinical benefit. Unfortunately, the majority of patients will develop disease progression within 1 year. Preclinical and clinical evidence suggests that resistance mechanisms involve the restoration of MAPK signaling which becomes inhibition-independent due to upstream or downstream alterations, and the activation of bypass pathways, such as the PI3/AKT/mTOR pathway. Future research should be directed to deciphering the mechanisms of cancer cells' oncogenic dependence, understanding the tissue-specific mechanisms of BRAF-mutant tumors, and optimizing treatment strategies after progression on BRAF and MEK inhibition.
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9
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Zhao J, Luo Z. Discovery of Raf Family Is a Milestone in Deciphering the Ras-Mediated Intracellular Signaling Pathway. Int J Mol Sci 2022; 23:ijms23095158. [PMID: 35563547 PMCID: PMC9101324 DOI: 10.3390/ijms23095158] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 05/02/2022] [Accepted: 05/03/2022] [Indexed: 01/27/2023] Open
Abstract
The Ras-Raf-MEK-ERK signaling pathway, the first well-established MAPK pathway, plays essential roles in cell proliferation, survival, differentiation and development. It is activated in over 40% of human cancers owing to mutations of Ras, membrane receptor tyrosine kinases and other oncogenes. The Raf family consists of three isoforms, A-Raf, B-Raf and C-Raf. Since the first discovery of a truncated mutant of C-Raf as a transforming oncogene carried by a murine retrovirus, forty years of extensive studies have provided a wealth of information on the mechanisms underlying the activation, regulation and biological functions of the Raf family. However, the mechanisms by which activation of A-Raf and C-Raf is accomplished are still not completely understood. In contrast, B-Raf can be easily activated by binding of Ras-GTP, followed by cis-autophosphorylation of the activation loop, which accounts for the fact that this isoform is frequently mutated in many cancers, especially melanoma. The identification of oncogenic B-Raf mutations has led to accelerated drug development that targets Raf signaling in cancer. However, the effort has not proved as effective as anticipated, inasmuch as the mechanism of Raf activation involves multiple steps, factors and phosphorylation of different sites, as well as complex interactions between Raf isoforms. In this review, we will focus on the physiological complexity of the regulation of Raf kinases and their connection to the ERK phosphorylation cascade and then discuss the role of Raf in tumorigenesis and the clinical application of Raf inhibitors in the treatment of cancer.
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Affiliation(s)
- Jingtong Zhao
- Queen Mary School, Nanchang University, Nanchang 330031, China;
| | - Zhijun Luo
- Queen Mary School, Nanchang University, Nanchang 330031, China;
- Provincial Key Laboratory of Tumor Pathogens and Molecular Pathology, Nanchang University, Nanchang 330031, China
- NCU-QMUL Joint Research Institute of Precision Medical Science, Nanchang 330031, China
- Correspondence:
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10
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Discoidin Domain Receptor 2 orchestrates melanoma resistance combining phenotype switching and proliferation. Oncogene 2022; 41:2571-2586. [PMID: 35322197 DOI: 10.1038/s41388-022-02266-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 02/08/2022] [Accepted: 03/01/2022] [Indexed: 11/09/2022]
Abstract
Combined therapy with anti-BRAF plus anti-MEK is currently used as first-line treatment of patients with metastatic melanomas harboring the somatic BRAF V600E mutation. However, the main issue with targeted therapy is the acquisition of tumor cell resistance. In a majority of resistant melanoma cells, the resistant process consists in epithelial-to-mesenchymal transition (EMT). This process called phenotype switching makes melanoma cells more invasive. Its signature is characterized by MITF low, AXL high, and actin cytoskeleton reorganization through RhoA activation. In parallel of this phenotype switching phase, the resistant cells exhibit an anarchic cell proliferation due to hyper-activation of the MAP kinase pathway. We show that a majority of human melanoma overexpress discoidin domain receptor 2 (DDR2) after treatment. The same result was found in resistant cell lines presenting phenotype switching compared to the corresponding sensitive cell lines. We demonstrate that DDR2 inhibition induces a decrease in AXL expression and reduces stress fiber formation in resistant melanoma cell lines. In this phenotype switching context, we report that DDR2 control cell and tumor proliferation through the MAP kinase pathway in resistant cells in vitro and in vivo. Therefore, inhibition of DDR2 could be a new and promising strategy for countering this resistance mechanism.
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11
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Zhong J, Yan W, Wang C, Liu W, Lin X, Zou Z, Sun W, Chen Y. BRAF Inhibitor Resistance in Melanoma: Mechanisms and Alternative Therapeutic Strategies. Curr Treat Options Oncol 2022; 23:1503-1521. [PMID: 36181568 PMCID: PMC9596525 DOI: 10.1007/s11864-022-01006-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/27/2022] [Indexed: 01/30/2023]
Abstract
OPINION STATEMENT Melanoma is caused by a variety of somatic mutations, and among these mutations, BRAF mutation occurs most frequently and has routinely been evaluated as a critical diagnostic biomarker in clinical practice. The introduction of targeted agents for BRAF-mutant melanoma has significantly improved overall survival in a large proportion of patients. However, there is BRAF inhibitor resistance in most patients, and its mechanisms are complicated and need further clarification. Additionally, treatment approaches to overcome resistance have evolved rapidly, shifting from monotherapy to multimodality treatment, which has dramatically improved patient outcomes in clinical trials and practice. This review highlights the mechanisms of BRAF inhibitor resistance in melanoma and discusses the current state of its therapeutic approaches that can be further explored in clinical practice.
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Affiliation(s)
- Jingqin Zhong
- grid.452404.30000 0004 1808 0942Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, 270 Dongan Road, Xuhui, Shanghai, China
| | - Wangjun Yan
- grid.452404.30000 0004 1808 0942Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, 270 Dongan Road, Xuhui, Shanghai, China
| | - Chunmeng Wang
- grid.452404.30000 0004 1808 0942Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, 270 Dongan Road, Xuhui, Shanghai, China
| | - Wanlin Liu
- grid.452404.30000 0004 1808 0942Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, 270 Dongan Road, Xuhui, Shanghai, China
| | - Xinyi Lin
- grid.452404.30000 0004 1808 0942Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, 270 Dongan Road, Xuhui, Shanghai, China
| | - Zijian Zou
- grid.452404.30000 0004 1808 0942Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, 270 Dongan Road, Xuhui, Shanghai, China
| | - Wei Sun
- grid.452404.30000 0004 1808 0942Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, 270 Dongan Road, Xuhui, Shanghai, China
| | - Yong Chen
- grid.452404.30000 0004 1808 0942Department of Musculoskeletal Oncology, Fudan University Shanghai Cancer Center, 270 Dongan Road, Xuhui, Shanghai, China
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12
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Recent developments in mitogen activated protein kinase inhibitors as potential anticancer agents. Bioorg Chem 2021; 114:105161. [PMID: 34328852 DOI: 10.1016/j.bioorg.2021.105161] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 07/06/2021] [Accepted: 07/07/2021] [Indexed: 01/06/2023]
Abstract
The mitogen activated protein kinase (MAPK) belongs to group of kinase that links the extracellular stimuli to intracellular response. The MAPK signalling pathway (RAS-RAF-MEK-ERK) involved in different pathological conditions like cancer, caused due to genetic or any other factor such as physical or environmental. Many studies have been conducted on the pathological view of MAPK cascade and its associated element like RAS, RAF, MEK, ERK or its isoforms, and still the research is going on particularly with respect to its activation, regulation and inhibition. The MAPK signalling pathway has become the area of research to identify new target for the management of cancer. A number of heterocyclics are key to fight with the cancer associated with these enzymes thus give some hope in the management of cancer by inhibiting MAPK cascade. In the present article, we have focussed on MAPK signalling pathway and role of different heterocyclic scaffolds bearing nitrogen, sulphur and oxygen and about their potential to block MAPK signalling pathway. The heterocyclics are gaining importance due to high potency and selectivity with less off-target effects against different targets involved in the MAPK signalling pathway. We have tried to cover recent advancements in the MAPK signalling pathway inhibitors with an aim to get better understanding of the mechanism of action of the compounds. Several compounds in the preclinical and clinical studies have been thoroughly dealt with. In addition to the synthetic compounds, a significant number of natural products containing heterocyclic moieties as MAPK signalling pathway inhibitors have been put together. The structure activity relationship along with docking studies have been discussed to apprehend the mechanistic studies of various compounds that will ultimately help to design and develop more MAPK signalling pathway inhibitors.
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13
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Zhao J, Galvez C, Beckermann KE, Johnson DB, Sosman JA. Novel insights into the pathogenesis and treatment of NRAS mutant melanoma. EXPERT REVIEW OF PRECISION MEDICINE AND DRUG DEVELOPMENT 2021; 6:281-294. [PMID: 34485698 PMCID: PMC8415440 DOI: 10.1080/23808993.2021.1938545] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
INTRODUCTION NRAS was the first mutated oncogene identified in melanoma and is currently the second most common driver mutation in this malignancy. For patients with NRASmutant advanced stage melanoma refractory to immunotherapy or with contraindications to immune-based regimens, there are few therapeutic options including low-efficacy chemotherapy regimens and binimetinib monotherapy. Here, we review recent advances in preclinical studies of molecular targets for NRAS mutant melanoma as well as the failures and successes of early-phase clinical trials. While there are no targeted therapies for NRAS-driven melanoma, there is great promise in approaches combining MEK inhibition with inhibitors of the focal adhesion kinase (FAK), inhibitors of autophagy pathways, and pan-RAF inhibitors. AREAS COVERED This review surveys new developments in all aspects of disease pathogenesis and potential treatment - including those that have failed, stalled, or progressed through various phases of preclinical and clinical development. EXPERT OPINION There are no currently approved targeted therapies for BRAF wild-type melanoma patients harboring NRAS driver mutations though an array of agents are in early phase clinical trials. The diverse strategies taken exploit combined MAP kinase signaling blockade with inhibition of cell cycle mediators, inhibition of the autophagy pathway, and alteration of kinases involved in actin cytoskeleton signaling. Future advances of developmental therapeutics into late stage trials may yield new options beyond immunotherapy for patients with advanced stage disease and NRAS mutation status.
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Affiliation(s)
- Jeffrey Zhao
- Northwestern University Feinberg School of Medicine
| | - Carlos Galvez
- Northwestern Medicine, Division of Hematology and Oncology.,Robert H. Lurie Comprehensive Cancer Center
| | - Kathryn Eby Beckermann
- Vanderbilt University Medical Center, Department of Medicine, Division of Hematology and Oncology, 1301 Medical Center Drive, Nashville, 37232, USA
| | - Douglas B Johnson
- Vanderbilt University Medical Center, Department of Medicine, Division of Hematology and Oncology, 1301 Medical Center Drive, Nashville, 37232, USA
| | - Jeffrey A Sosman
- Northwestern Medicine, Division of Hematology and Oncology.,Robert H. Lurie Comprehensive Cancer Center
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14
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Tangella LP, Clark ME, Gray ES. Resistance mechanisms to targeted therapy in BRAF-mutant melanoma - A mini review. Biochim Biophys Acta Gen Subj 2020; 1865:129736. [PMID: 32956754 DOI: 10.1016/j.bbagen.2020.129736] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 08/28/2020] [Accepted: 09/14/2020] [Indexed: 02/07/2023]
Abstract
BACKGROUND The introduction of targeted therapies for the treatment of BRAF-mutant melanomas have improved survival rates in a significant proportion of patients. Nonetheless, the emergence of resistance to treatment remains inevitable in most patients. SCOPE OF REVIEW Here, we review known and emerging molecular mechanisms that underlay the development of resistance to MAPK inhibition in melanoma cells and the potential strategies to overcome these mechanisms. MAJOR CONCLUSIONS Multiple genetic and non-genetic mechanisms contribute to treatment failure, commonly leading to the reactivation of the MAPK pathway. A variety of resistance mechanisms are enabled by the underlying heterogeneity and plasticity of melanoma cells. Moreover, it has become apparent that resistance to targeted therapy is underpinned by early functional adaptations involving the rewiring of cell states and metabolic pathways. GENERAL SIGNIFICANCE The evidence presented suggest that the use of a combinatorial treatment approach would delay the emergence of resistance and improve patient outcomes.
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Affiliation(s)
- Lokeswari P Tangella
- School of Medical and Health Sciences, Edith Cowan University, Perth 6027, Western Australia, Australia
| | - Michael E Clark
- School of Medical and Health Sciences, Edith Cowan University, Perth 6027, Western Australia, Australia
| | - Elin S Gray
- School of Medical and Health Sciences, Edith Cowan University, Perth 6027, Western Australia, Australia.
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15
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Schreck KC, Grossman SA, Pratilas CA. BRAF Mutations and the Utility of RAF and MEK Inhibitors in Primary Brain Tumors. Cancers (Basel) 2019; 11:E1262. [PMID: 31466300 PMCID: PMC6769482 DOI: 10.3390/cancers11091262] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2019] [Revised: 08/22/2019] [Accepted: 08/24/2019] [Indexed: 12/19/2022] Open
Abstract
BRAF mutations have been identified as targetable, oncogenic mutations in many cancers. Given the paucity of treatments for primary brain tumors and the poor prognosis associated with high-grade gliomas, BRAF mutations in glioma are of considerable interest. In this review, we present the spectrum of BRAF mutations and fusion alterations present in each class of primary brain tumor based on publicly available databases and publications. We also summarize clinical experience with RAF and MEK inhibitors in patients with primary brain tumors and describe ongoing clinical trials of RAF inhibitors in glioma. Sensitivity to RAF and MEK inhibitors varies among BRAF mutations and between tumor types as only class I BRAF V600 mutations are sensitive to clinically available RAF inhibitors. While class II and III BRAF mutations are found in primary brain tumors, further research is necessary to determine their sensitivity to third-generation RAF inhibitors and/or MEK inhibitors. We recommend that the neuro-oncologist consider using these drugs primarily in the setting of a clinical trial for patients with BRAF-altered glioma in order to advance our knowledge of their efficacy in this patient population.
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Affiliation(s)
- Karisa C Schreck
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Baltimore, MD 21287, USA.
| | - Stuart A Grossman
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Baltimore, MD 21287, USA
| | - Christine A Pratilas
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Baltimore, MD 21287, USA
- Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
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16
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Man RJ, Zhang YL, Jiang AQ, Zhu HL. A patent review of RAF kinase inhibitors (2010–2018). Expert Opin Ther Pat 2019; 29:675-688. [DOI: 10.1080/13543776.2019.1651842] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Ruo-Jun Man
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, People’s Republic of China
- College of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning, People’s Republic of China
| | - Ya-Liang Zhang
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, People’s Republic of China
| | - Ai-Qin Jiang
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, People’s Republic of China
| | - Hai-Liang Zhu
- State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, People’s Republic of China
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17
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Yao Z, Gao Y, Su W, Yaeger R, Tao J, Na N, Zhang Y, Zhang C, Rymar A, Tao A, Timaul NM, Mcgriskin R, Outmezguine NA, Zhao H, Chang Q, Qeriqi B, Barbacid M, de Stanchina E, Hyman DM, Bollag G, Rosen N. RAF inhibitor PLX8394 selectively disrupts BRAF dimers and RAS-independent BRAF-mutant-driven signaling. Nat Med 2018; 25:284-291. [PMID: 30559419 PMCID: PMC6404779 DOI: 10.1038/s41591-018-0274-5] [Citation(s) in RCA: 120] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 10/09/2018] [Indexed: 12/03/2022]
Abstract
Activating BRAF mutants and fusions signal as RAS-independent constitutively active dimers with the exception of BRAF V600 mutant alleles which can function as active monomers1. Current RAF inhibitors are monomer selective, they potently inhibit BRAF V600 monomers but their inhibition of RAF dimers is limited by induction of negative cooperativity when bound to one site in the dimer1–3. Moreover, acquired resistance to these drugs is usually due to molecular lesions that cause V600 mutants to dimerize4–8. We show here that PLX8394, a new RAF inhibitor9, inhibits ERK signaling by specifically disrupting BRAF-containing dimers, including BRAF homodimers and BRAF-CRAF heterodimers, but not CRAF homodimers or ARAF-containing dimers. Differences in the amino acid residues in the N-terminal portion of the kinase domain of RAF isoforms are responsible for this differential vulnerability. As a BRAF-specific dimer breaker, PLX8394 selectively inhibits ERK signaling in tumors driven by dimeric BRAF mutants, including BRAF fusions and splice variants and as well BRAF V600 monomers, but spares RAF function in normal cells in which CRAF homodimers can drive signaling. Our work suggests that drugs with these properties will be safe and useful for treating tumors driven by activating BRAF mutants or fusions.
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Affiliation(s)
- Zhan Yao
- Program in Molecular Pharmacology, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Yijun Gao
- Program in Molecular Pharmacology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Wenjing Su
- Program in Molecular Pharmacology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Rona Yaeger
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Weill Cornell Medical College, New York, NY, USA
| | - Jessica Tao
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Na Na
- Program in Molecular Pharmacology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | | | | | | | - Anthony Tao
- Center for Neural Science, College of Arts and Sciences, New York University, New York, NY, USA
| | - Neilawattie M Timaul
- Program in Molecular Pharmacology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Rory Mcgriskin
- Program in Molecular Pharmacology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Nathaniel A Outmezguine
- Program in Molecular Pharmacology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - HuiYong Zhao
- Program in Molecular Pharmacology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Qing Chang
- Program in Molecular Pharmacology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Besnik Qeriqi
- Program in Molecular Pharmacology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Mariano Barbacid
- Molecular Oncology Programme, Centro Nacional de Investigaciones Oncológicas, Madrid, Spain
| | - Elisa de Stanchina
- Program in Molecular Pharmacology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - David M Hyman
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Weill Cornell Medical College, New York, NY, USA
| | | | - Neal Rosen
- Program in Molecular Pharmacology, Memorial Sloan Kettering Cancer Center, New York, NY, USA. .,Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA. .,Center for Mechanism-Based Therapeutics, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
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18
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Waters AM, Der CJ. KRAS: The Critical Driver and Therapeutic Target for Pancreatic Cancer. Cold Spring Harb Perspect Med 2018; 8:a031435. [PMID: 29229669 PMCID: PMC5995645 DOI: 10.1101/cshperspect.a031435] [Citation(s) in RCA: 494] [Impact Index Per Article: 82.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
RAS genes (HRAS, KRAS, and NRAS) comprise the most frequently mutated oncogene family in human cancer. With the highest RAS mutation frequencies seen with the top three causes of cancer deaths in the United States (lung, colorectal, and pancreatic cancer), the development of anti-RAS therapies is a major priority for cancer research. Despite more than three decades of intense effort, no effective RAS inhibitors have yet to reach the cancer patient. With bitter lessons learned from past failures and with new ideas and strategies, there is renewed hope that undruggable RAS may finally be conquered. With the KRAS isoform mutated in 84% of all RAS-mutant cancers, we focus on KRAS. With a near 100% KRAS mutation frequency, pancreatic ductal adenocarcinoma (PDAC) is considered the most RAS-addicted of all cancers. We review the role of KRAS as a driver and therapeutic target in PDAC.
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Affiliation(s)
- Andrew M Waters
- University of North Carolina at Chapel Hill, Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina 27599
| | - Channing J Der
- University of North Carolina at Chapel Hill, Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina 27599
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19
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Grasso M, Estrada MA, Berrios KN, Winkler JD, Marmorstein R. N-(7-Cyano-6-(4-fluoro-3-(2-(3-(trifluoromethyl)phenyl)acetamido)phenoxy)benzo[d]thiazol-2-yl)cyclopropanecarboxamide (TAK632) Promotes Inhibition of BRAF through the Induction of Inhibited Dimers. J Med Chem 2018; 61:5034-5046. [PMID: 29727562 DOI: 10.1021/acs.jmedchem.8b00499] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
BRAFV600E is the most common activating mutation in melanoma and patients treated with BRAFV600E inhibitors all develop resistance within one year. A significant resistance pathway is paradoxical activation (transactivation) involving BRAF dimers, whereby an inhibitor bound protein subunit allosterically activates the other subunit. We recently reported on dimeric BRAFV600E -selective vemurafenib inhibitors that stabilize an inactive αC-out/αC-out homodimeric conformation with improved inhibitor potency and selectivity in vitro. We set out to extend this strategy to target RAF homo- and heterodimers with the pan-RAF inhibitor TAK632 in dimeric configuration. Surprisingly, we find that monomeric TAK632 induces an active αC-in/αC-in BRAF dimer conformation, while dimeric TAK inhibitors cannot promote BRAF dimers and have significantly compromised potency in vitro. These studies uncover the intimate connection between BRAF dimerization and TAK632 mode of inhibition and highlight the importance of understanding the impact of BRAF inhibitors on kinase dimerization.
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Affiliation(s)
- Michael Grasso
- Department of Biochemistry and Biophysics and the Abramson Family Cancer Research Institute, Perelman School of Medicine , University of Pennsylvania , 421 Curie Boulevard , Philadelphia , Pennsylvania 19104 , United States.,Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104 , United States
| | - Michelle A Estrada
- Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104 , United States
| | - Kiara N Berrios
- Department of Biochemistry and Biophysics and the Abramson Family Cancer Research Institute, Perelman School of Medicine , University of Pennsylvania , 421 Curie Boulevard , Philadelphia , Pennsylvania 19104 , United States
| | - Jeffrey D Winkler
- Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104 , United States
| | - Ronen Marmorstein
- Department of Biochemistry and Biophysics and the Abramson Family Cancer Research Institute, Perelman School of Medicine , University of Pennsylvania , 421 Curie Boulevard , Philadelphia , Pennsylvania 19104 , United States.,Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104 , United States
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20
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Affiliation(s)
- Bogos Agianian
- Department of Biochemistry and Department of Medicine, Albert Einstein Cancer Center, Albert Einstein College of Medicine, Bronx, New York 10461, United States
| | - Evripidis Gavathiotis
- Department of Biochemistry and Department of Medicine, Albert Einstein Cancer Center, Albert Einstein College of Medicine, Bronx, New York 10461, United States
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21
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Zhao K, Zhou X, Ding M. Molecular insight into mutation-induced conformational change in metastasic bowel cancer BRAF kinase domain and its implications for selective inhibitor design. J Mol Graph Model 2017; 79:59-64. [PMID: 29145034 DOI: 10.1016/j.jmgm.2017.11.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Revised: 10/31/2017] [Accepted: 11/06/2017] [Indexed: 11/30/2022]
Abstract
Oncogenic BRAF V600E mutation confers constitutive activation for the kinase and is closely related to the pathogenesis of metastasic bowel cancer (MBC). Here, the V600E-induced conformational change in MBC BRAF kinase domain is characterized systematically at structural, energetic and dynamic levels. The mutation is observed to cause a conformational conversion of the kinase's activation loop from DFG-out to DFG-in, thus activating the kinase. Electrostatic force is primarily responsible for the conformational conversion and stabilization of DFG-in associated with the mutation. Molecular docking calculations are employed to analyze the binding mode difference of mutant-selective inhibitors between the DFG-out and DFG-in conformations of BRAF kinase. It is revealed that the mutation can reshape inhibitor selectivity profile by altering kinase loop conformation. Several compounds are determined to have a high or moderate selectivity for mutant over wild-type kinase. The selectivity is primarily originated from hydrogen bond interactions of inhibitor ligands with mutant rather than wild type due to the conformational difference in kinase domain.
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Affiliation(s)
- Kai Zhao
- Department of Gastroenterology, People's Hospital of Jintan, Changzhou 213200, China
| | - Xin Zhou
- Department of Gastroenterology, People's Hospital of Jintan, Changzhou 213200, China
| | - Ming Ding
- Department of Respiration, The Affiliated Hospital of Jiangsu University, Zhenjiang 212001, China.
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22
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Hartsough EJ, Kugel CH, Vido MJ, Berger AC, Purwin TJ, Goldberg A, Davies MA, Schiewer MJ, Knudsen KE, Bollag G, Aplin AE. Response and Resistance to Paradox-Breaking BRAF Inhibitor in Melanomas In Vivo and Ex Vivo. Mol Cancer Ther 2017; 17:84-95. [PMID: 29133617 DOI: 10.1158/1535-7163.mct-17-0705] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 09/08/2017] [Accepted: 10/19/2017] [Indexed: 12/21/2022]
Abstract
FDA-approved BRAF inhibitors produce high response rates and improve overall survival in patients with BRAF V600E/K-mutant melanoma, but are linked to pathologies associated with paradoxical ERK1/2 activation in wild-type BRAF cells. To overcome this limitation, a next-generation paradox-breaking RAF inhibitor (PLX8394) has been designed. Here, we show that by using a quantitative reporter assay, PLX8394 rapidly suppressed ERK1/2 reporter activity and growth of mutant BRAF melanoma xenografts. Ex vivo treatment of xenografts and use of a patient-derived explant system (PDeX) revealed that PLX8394 suppressed ERK1/2 signaling and elicited apoptosis more effectively than the FDA-approved BRAF inhibitor, vemurafenib. Furthermore, PLX8394 was efficacious against vemurafenib-resistant BRAF splice variant-expressing tumors and reduced splice variant homodimerization. Importantly, PLX8394 did not induce paradoxical activation of ERK1/2 in wild-type BRAF cell lines or PDeX. Continued in vivo dosing of xenografts with PLX8394 led to the development of acquired resistance via ERK1/2 reactivation through heterogeneous mechanisms; however, resistant cells were found to have differential sensitivity to ERK1/2 inhibitor. These findings highlight the efficacy of a paradox-breaking selective BRAF inhibitor and the use of PDeX system to test the efficacy of therapeutic agents. Mol Cancer Ther; 17(1); 84-95. ©2017 AACR.
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Affiliation(s)
- Edward J Hartsough
- Department of Cancer Biology, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Curtis H Kugel
- Department of Cancer Biology, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Michael J Vido
- Department of Cancer Biology, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Adam C Berger
- Department of Surgery, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Timothy J Purwin
- Department of Cancer Biology, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Allison Goldberg
- Department of Pathology, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Michael A Davies
- Department of Melanoma Medical Oncology, Division of Cancer Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Matthew J Schiewer
- Department of Cancer Biology, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Karen E Knudsen
- Department of Cancer Biology, Thomas Jefferson University, Philadelphia, Pennsylvania
| | | | - Andrew E Aplin
- Department of Cancer Biology, Thomas Jefferson University, Philadelphia, Pennsylvania. .,Sidney Kimmel Cancer Center at Thomas Jefferson University, Philadelphia, PA
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23
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Abstract
The discovery that a subset of human tumours is dependent on mutationally deregulated BRAF kinase intensified the development of RAF inhibitors to be used as potential therapeutics. The US Food and Drug Administration (FDA)-approved second-generation RAF inhibitors vemurafenib and dabrafenib have elicited remarkable responses and improved survival of patients with BRAF-V600E/K melanoma, but their effectiveness is limited by resistance. Beyond melanoma, current clinical RAF inhibitors show modest efficacy when used for colorectal and thyroid BRAF-V600E tumours or for tumours harbouring BRAF alterations other than the V600 mutation. Accumulated experimental and clinical evidence indicates that the complex biochemical mechanisms of RAF kinase signalling account both for the effectiveness of RAF inhibitors and for the various mechanisms of tumour resistance to them. Recently, a number of next-generation RAF inhibitors, with diverse structural and biochemical properties, have entered preclinical and clinical development. In this Review, we discuss the current understanding of RAF kinase regulation, mechanisms of inhibitor action and related clinical resistance to these drugs. The recent elucidation of critical structural and biochemical aspects of RAF inhibitor action, combined with the availability of a number of structurally diverse RAF inhibitors currently in preclinical and clinical development, will enable the design of more effective RAF inhibitors and RAF-inhibitor-based therapeutic strategies, tailored to different clinical contexts.
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Affiliation(s)
- Zoi Karoulia
- Department of Oncological Sciences and Department of Dermatology, The Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
| | - Evripidis Gavathiotis
- Department of Biochemistry, Department of Medicine, Albert Einstein Cancer Center, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Poulikos I Poulikakos
- Department of Oncological Sciences and Department of Dermatology, The Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
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24
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Young GJ, Bi WL, Wu WW, Johanns TM, Dunn GP, Dunn IF. Management of intracranial melanomas in the era of precision medicine. Oncotarget 2017; 8:89326-89347. [PMID: 29179523 PMCID: PMC5687693 DOI: 10.18632/oncotarget.19223] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 04/24/2017] [Indexed: 01/08/2023] Open
Abstract
Melanoma is the most lethal of skin cancers, in part because of its proclivity for rapid and distant metastasis. It is also potentially the most neurotropic cancer in terms of probability of CNS metastasis from the primary lesion. Despite surgical resection and radiotherapy, prognosis remains guarded for patients with brain metastases. Over the past five years, a new domain of personalized therapy has emerged for advanced melanoma patients with the introduction of BRAF and other MAP kinase pathway inhibitors, immunotherapy, and combinatory therapeutic strategies. By targeting critical cellular signaling pathways and unleashing the adaptive immune response against tumor antigens, a subset of melanoma patients have demonstrated remarkable responses to these treatments. Over time, acquired resistance to these modalities inexorably develops, providing new challenges to overcome. We review the rapidly evolving terrain for intracranial melanoma treatment, address likely and potential mechanisms of resistance, as well as evaluate promising future therapeutic approaches currently under clinical investigation.
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Affiliation(s)
- Grace J Young
- Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Wenya Linda Bi
- Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.,Department of Cancer Biology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | - Winona W Wu
- Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Tanner M Johanns
- Division of Medical Oncology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO, USA.,Center for Human Immunology and Immunotherapy Programs, Washington University School of Medicine, St. Louis, MO, USA
| | - Gavin P Dunn
- Center for Human Immunology and Immunotherapy Programs, Washington University School of Medicine, St. Louis, MO, USA.,Department of Neurological Surgery, Washington University School of Medicine, St. Louis, MO, USA
| | - Ian F Dunn
- Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
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Tutuka CSA, Andrews MC, Mariadason JM, Ioannidis P, Hudson C, Cebon J, Behren A. PLX8394, a new generation BRAF inhibitor, selectively inhibits BRAF in colonic adenocarcinoma cells and prevents paradoxical MAPK pathway activation. Mol Cancer 2017; 16:112. [PMID: 28659148 PMCID: PMC5490236 DOI: 10.1186/s12943-017-0684-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 06/21/2017] [Indexed: 01/07/2023] Open
Abstract
BRAF inhibitors (BRAFi) are standard of care for the treatment of BRAF V600 mutation-driven metastatic melanoma, but can lead to paradoxical activation of the mitogen-activated protein kinase (MAPK) signalling pathway. This can result in the promotion of precancerous lesions and secondary neoplasms, mainly (but not exclusively) associated with pre-existing mutations in RAS genes. We previously reported a patient with synchronous BRAF-mutated metastatic melanoma and BRAFwt/KRASG12D-metastatic colorectal cancer (CRC), whose CRC relapsed and progressed when treated with the BRAF inhibitor dabrafenib (GSK2118436). We used tissue from the resected CRC metastasis to derive a cell line, LM-COL-1, which directly and reliably mimicked the clinical scenario including paradoxical activation of the MAPK signalling pathway resulting in increased cell proliferation upon dabrafenib treatment. Novel BRAF inhibitors (PLX8394 and PLX7904), dubbed as “paradox breakers”, were developed to inhibit V600 mutated oncogenic BRAF without causing paradoxical MAPK pathway activation. In this study we used our LM-COL-1 model alongside multiple other CRC cell lines with varying mutational backgrounds to demonstrate and confirm that the paradox breaker PLX8394 retains on-target inhibition of mutated BRAF V600 without paradoxically promoting MAPK signalling.
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Affiliation(s)
- Candani S A Tutuka
- Olivia Newton-John Cancer Research Institute, 145 Studley Road, Heidelberg, VIC, 3084, Australia
| | - Miles C Andrews
- Olivia Newton-John Cancer Research Institute, 145 Studley Road, Heidelberg, VIC, 3084, Australia.,Austin Medical Oncology Unit, Austin Health, Heidelberg, VIC, Australia.,School of Cancer Medicine, La Trobe University, Bundoora, VIC, Australia
| | - John M Mariadason
- Olivia Newton-John Cancer Research Institute, 145 Studley Road, Heidelberg, VIC, 3084, Australia.,School of Cancer Medicine, La Trobe University, Bundoora, VIC, Australia
| | - Paul Ioannidis
- Olivia Newton-John Cancer Research Institute, 145 Studley Road, Heidelberg, VIC, 3084, Australia
| | - Christopher Hudson
- Olivia Newton-John Cancer Research Institute, 145 Studley Road, Heidelberg, VIC, 3084, Australia
| | - Jonathan Cebon
- Olivia Newton-John Cancer Research Institute, 145 Studley Road, Heidelberg, VIC, 3084, Australia.,Austin Medical Oncology Unit, Austin Health, Heidelberg, VIC, Australia.,School of Cancer Medicine, La Trobe University, Bundoora, VIC, Australia.,Department of Medicine, University of Melbourne, Parkville, VIC, Australia
| | - Andreas Behren
- Olivia Newton-John Cancer Research Institute, 145 Studley Road, Heidelberg, VIC, 3084, Australia. .,School of Cancer Medicine, La Trobe University, Bundoora, VIC, Australia.
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Hartsough EJ, Vido MJ. αC IN, αC OUT-that's what it's all about. Pigment Cell Melanoma Res 2017; 30:177-178. [PMID: 27801548 DOI: 10.1111/pcmr.12549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Revised: 10/19/2016] [Accepted: 10/21/2016] [Indexed: 11/29/2022]
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Exploring Molecular Mechanisms of Paradoxical Activation in the BRAF Kinase Dimers: Atomistic Simulations of Conformational Dynamics and Modeling of Allosteric Communication Networks and Signaling Pathways. PLoS One 2016; 11:e0166583. [PMID: 27861609 PMCID: PMC5115767 DOI: 10.1371/journal.pone.0166583] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 10/31/2016] [Indexed: 12/14/2022] Open
Abstract
The recent studies have revealed that most BRAF inhibitors can paradoxically induce kinase activation by promoting dimerization and enzyme transactivation. Despite rapidly growing number of structural and functional studies about the BRAF dimer complexes, the molecular basis of paradoxical activation phenomenon is poorly understood and remains largely hypothetical. In this work, we have explored the relationships between inhibitor binding, protein dynamics and allosteric signaling in the BRAF dimers using a network-centric approach. Using this theoretical framework, we have combined molecular dynamics simulations with coevolutionary analysis and modeling of the residue interaction networks to determine molecular determinants of paradoxical activation. We have investigated functional effects produced by paradox inducer inhibitors PLX4720, Dabrafenib, Vemurafenib and a paradox breaker inhibitor PLX7904. Functional dynamics and binding free energy analyses of the BRAF dimer complexes have suggested that negative cooperativity effect and dimer-promoting potential of the inhibitors could be important drivers of paradoxical activation. We have introduced a protein structure network model in which coevolutionary residue dependencies and dynamic maps of residue correlations are integrated in the construction and analysis of the residue interaction networks. The results have shown that coevolutionary residues in the BRAF structures could assemble into independent structural modules and form a global interaction network that may promote dimerization. We have also found that BRAF inhibitors could modulate centrality and communication propensities of global mediating centers in the residue interaction networks. By simulating allosteric communication pathways in the BRAF structures, we have determined that paradox inducer and breaker inhibitors may activate specific signaling routes that correlate with the extent of paradoxical activation. While paradox inducer inhibitors may facilitate a rapid and efficient communication via an optimal single pathway, the paradox breaker may induce a broader ensemble of suboptimal and less efficient communication routes. The central finding of our study is that paradox breaker PLX7904 could mimic structural, dynamic and network features of the inactive BRAF-WT monomer that may be required for evading paradoxical activation. The results of this study rationalize the existing structure-functional experiments by offering a network-centric rationale of the paradoxical activation phenomenon. We argue that BRAF inhibitors that amplify dynamic features of the inactive BRAF-WT monomer and intervene with the allosteric interaction networks may serve as effective paradox breakers in cellular environment.
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Tampellini M, La Salvia A, Scagliotti GV. Novel investigational therapies for treating biliary tract carcinoma. Expert Opin Investig Drugs 2016; 25:1423-1436. [PMID: 27771967 DOI: 10.1080/13543784.2016.1252330] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
INTRODUCTION Cholangiocarcinoma (CCA) is an epithelial cell malignancy arising from bile ducts and/or peribiliary glands. Even though it is considered as a rare neoplasm, its incidence is raising, particularly in developed countries. Prognosis is generally poor with few patients who present the inclusion criteria for surgery (the mainstay treatment for this tumour). Several genetic alterations potentially driving tumour progression have been described, representing a possible target for new compounds. Areas covered: A clinical trial search in Clinicaltrials.gov encompassing a literature search in PubMed and ASCO/ESMO Websites was undertaken in March 2016. Expert opinion: Notwithstanding a large number of drug tested, results are still disappointing. The main reasons could be the low number of patients enrolled in trials, and the lack of a patient selection based on the biological profile of the tumours. Potential active drugs could have been discharged simply because beneficial in a particular subgroup of patients and not in un unselected population. The future direction of the research should consider biomarker evaluation in order to describe the genetic alteration/s that drive tumour progression and aggressiveness and the mechanisms of drug resistance. Finally, it will be of great interest to consider the results of immunotherapy whenever available.
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Affiliation(s)
- M Tampellini
- a Department of Oncology, AOU San Luigi di Orbassano , University of Turin , Torino , Italy
| | - A La Salvia
- a Department of Oncology, AOU San Luigi di Orbassano , University of Turin , Torino , Italy
| | - G V Scagliotti
- a Department of Oncology, AOU San Luigi di Orbassano , University of Turin , Torino , Italy
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29
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Digklia A, Michielin O. The cutting edge of metastatic melanoma therapy. Melanoma Manag 2016; 3:217-229. [PMID: 30190891 DOI: 10.2217/mmt-2016-0026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 06/16/2016] [Indexed: 11/21/2022] Open
Abstract
The past decade has witnessed impressive new developments for the treatment of melanoma. The discovery of key oncogenic driver mutations, upon which tumor establishment and progression are dependent, changed the prognosis of patients with stage IV disease. Extensive preclinical and clinical studies have shown high response rates and survival benefits over conventional chemotherapies provided by target-specific inhibitors of BRAF- or NRAS-activating mutations. Recent genomic analyses of melanoma have also given new potentially targetable driver mutations. In addition, the quickened pace of development of immune checkpoint inhibitors for the treatment of melanoma offers the unique opportunity to provide a long-term clinical benefit. In this emerging era, predictive biomarkers for the selection of patients are required to help us develop an optimal therapeutic strategy.
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Affiliation(s)
- Antonia Digklia
- Department of Oncology, Centre Hospitalier Universitaire Vaudois, Bugnon 46, 1011 Lausanne, Switzerland
| | - Olivier Michielin
- Department of Oncology, Centre Hospitalier Universitaire Vaudois, Bugnon 46, 1011 Lausanne, Switzerland
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30
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Bronte E, Bronte G, Novo G, Bronte F, Bavetta MG, Lo Re G, Brancatelli G, Bazan V, Natoli C, Novo S, Russo A. What links BRAF to the heart function? New insights from the cardiotoxicity of BRAF inhibitors in cancer treatment. Oncotarget 2016; 6:35589-601. [PMID: 26431495 PMCID: PMC4742127 DOI: 10.18632/oncotarget.5853] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 08/22/2015] [Indexed: 12/14/2022] Open
Abstract
The RAS-related signalling cascade has a fundamental role in cell. It activates differentiation and survival. It is particularly important one of its molecules, B-RAF. B-RAF has been a central point for research, especially in melanoma. Indeed, it lacked effective therapeutic weapons since the early years of its study. Molecules targeting B-RAF have been developed. Nowadays, two classes of molecules are approved by FDA. Multi-target molecules, such as Sorafenib and Regorafenib, and selective molecules, such as Vemurafenib and Dabrafenib. Many other molecules are still under investigation. Most of them are studied in phase 1 trials. Clinical studies correlate B-RAF inhibitors and QT prolongation. Though this cardiovascular side effect is not common using these drugs, it must be noticed early and recognize its signals. Indeed, Oncologists and Cardiologists should work in cooperation to prevent lethal events, such as fatal arrhythmias or sudden cardiac death. These events could originate from an uncontrolled QT prolongation.
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Affiliation(s)
- Enrico Bronte
- Department of Surgical, Oncological and Oral Sciences, Section of Medical Oncology, University of Palermo, Palermo, Italy
| | - Giuseppe Bronte
- Department of Surgical, Oncological and Oral Sciences, Section of Medical Oncology, University of Palermo, Palermo, Italy
| | - Giuseppina Novo
- Department of Internal Medicine and Cardiovascular Disease, University of Palermo, Palermo, Italy
| | - Fabrizio Bronte
- DiBiMIS, Section of Gastroenterology, University of Palermo, Palermo, Italy
| | | | - Giuseppe Lo Re
- Department of Radiology, University of Palermo, Palermo, Italy
| | | | - Viviana Bazan
- Department of Surgical, Oncological and Oral Sciences, Section of Medical Oncology, University of Palermo, Palermo, Italy
| | - Clara Natoli
- Department of Medical, Oral and Biotechnological Sciences, University "G. D'Annunzio", Chieti, Italy
| | - Salvatore Novo
- Department of Internal Medicine and Cardiovascular Disease, University of Palermo, Palermo, Italy
| | - Antonio Russo
- Department of Surgical, Oncological and Oral Sciences, Section of Medical Oncology, University of Palermo, Palermo, Italy
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Markowitz J, Mal TK, Yuan C, Courtney NB, Patel M, Stiff AR, Blachly J, Walker C, Eisfeld A, de la Chapelle A, Carson WE. Structural characterization of NRAS isoform 5. Protein Sci 2016; 25:1069-74. [PMID: 26947772 PMCID: PMC4838646 DOI: 10.1002/pro.2916] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Revised: 02/17/2016] [Accepted: 02/26/2016] [Indexed: 11/11/2022]
Abstract
It was recently discovered that the NRAS isoform 5 (20 amino acids) is expressed in melanoma and results in a more aggressive cell phenotype. This novel isoform is responsible for increased phosphorylation of downstream targets such as AKT, MEK, and ERK as well as increased cellular proliferation. This structure report describes the NMR solution structure of NRAS isoform 5 to be used as a starting point to understand its biophysical interactions. The isoform is highly flexible in aqueous solution, but forms a helix-turn-coil structure in the presence of trifluoroethanol as determined by NMR and CD spectroscopy.
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Affiliation(s)
- Joseph Markowitz
- Moffitt Cancer Center Department of Cutaneous OncologyThe Ohio State UniversityColumbusOhio
- The Ohio State University Comprehensive Cancer Center, The Ohio State UniversityColumbusOhio
| | - Tapas K. Mal
- The Ohio State University Campus Chemical Instrument Center‐NMR, The Ohio State UniversityColumbusOhio
| | - Chunhua Yuan
- The Ohio State University Campus Chemical Instrument Center‐NMR, The Ohio State UniversityColumbusOhio
| | - Nicholas B. Courtney
- The Ohio State University Comprehensive Cancer Center, The Ohio State UniversityColumbusOhio
| | - Mitra Patel
- The Ohio State University Comprehensive Cancer Center, The Ohio State UniversityColumbusOhio
| | - Andrew R. Stiff
- The Ohio State University Comprehensive Cancer Center, The Ohio State UniversityColumbusOhio
| | - James Blachly
- The Ohio State University Comprehensive Cancer Center, The Ohio State UniversityColumbusOhio
| | - Christopher Walker
- The Ohio State University Comprehensive Cancer Center, The Ohio State UniversityColumbusOhio
| | - Ann‐Kathrin Eisfeld
- The Ohio State University Comprehensive Cancer Center, The Ohio State UniversityColumbusOhio
| | - Albert de la Chapelle
- The Ohio State University Comprehensive Cancer Center, The Ohio State UniversityColumbusOhio
| | - William E. Carson
- The Ohio State University Comprehensive Cancer Center, The Ohio State UniversityColumbusOhio
- The Ohio State University Wexner Medical Center Department of SurgeryThe Ohio State UniversityColumbusOhio
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Abstract
The past several years can be considered a renaissance era in the treatment of metastatic melanoma. Following a 30-year stretch in which oncologists barely put a dent in a very grim overall survival (OS) rate for these patients, things have rapidly changed course with the recent approval of three new melanoma drugs by the FDA. Both oncogene-targeted therapy and immune checkpoint blockade approaches have shown remarkable efficacy in a subset of melanoma patients and have clearly been game-changers in terms of clinical impact. However, most patients still succumb to their disease, and thus, there remains an urgent need to improve upon current therapies. Fortunately, innovations in molecular medicine have led to many silent gains that have greatly increased our understanding of the nature of cancer biology as well as the complex interactions between tumors and the immune system. They have also allowed for the first time a detailed understanding of an individual patient's cancer at the genomic and proteomic level. This information is now starting to be employed at all stages of cancer treatment, including diagnosis, choice of drug therapy, treatment monitoring, and analysis of resistance mechanisms upon recurrence. This new era of personalized medicine will foreseeably lead to paradigm shifts in immunotherapeutic treatment approaches such as individualized cancer vaccines and adoptive transfer of genetically modified T cells. Advances in xenograft technology will also allow for the testing of drug combinations using in vivo models, a truly necessary development as the number of new drugs needing to be tested is predicted to skyrocket in the coming years. This chapter will provide an overview of recent technological developments in cancer research, and how they are expected to impact future diagnosis, monitoring, and development of novel treatments for metastatic melanoma.
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Affiliation(s)
| | | | | | - Patrick Hwu
- University of Texas MD Anderson Cancer Center, Houston, TX, USA.
| | - Gregory Lizée
- University of Texas MD Anderson Cancer Center, Houston, TX, USA
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Abstract
The three RAS genes comprise the most frequently mutated oncogene family in cancer. With significant and compelling evidence that continued function of mutant RAS is required for tumor maintenance, it is widely accepted that effective anti-RAS therapy will have a significant impact on cancer growth and patient survival. However, despite more than three decades of intense research and pharmaceutical industry efforts, a clinically effective anti-RAS drug has yet to be developed. With the recent renewed interest in targeting RAS, exciting and promising progress has been made. In this review, we discuss the prospects and challenges of drugging oncogenic RAS. In particular we focus on new inhibitors of RAS effector signaling and the ERK mitogen-activated protein kinase cascade.
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Dienstmann R, Lassen U, Cebon J, Desai J, Brown MP, Evers S, Su F, Zhang W, Boisserie F, Lestini B, Schostack K, Meresse V, Tabernero J. First-in-Man Dose-Escalation Study of the Selective BRAF Inhibitor RG7256 in Patients with BRAF V600-Mutated Advanced Solid Tumors. Target Oncol 2015; 11:149-56. [PMID: 26310975 DOI: 10.1007/s11523-015-0381-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
BACKGROUND BRAF mutations are a validated target for cancer therapy. A second-generation BRAF inhibitor with an improved preclinical safety profile (RG7256) was evaluated in a first-in-man study in order to determine the safety, efficacy, pharmacokinetics and pharmacodynamics in patients with BRAF V600-mutated advanced solid tumors. PATIENTS AND METHODS Patients received RG7256 orally over 8 dose levels from 200 mg once a day (QD) to 2400 mg twice a day (BID) (50-, 100- and 150-mg tablets) using a classic 3 + 3 dose escalation design. RESULTS In total, 45 patients were enrolled; most (87 %) had advanced melanoma (94 % BRAF V600E). RG7256 was rapidly absorbed, with limited accumulation and dose-proportional increase in exposure up to 1950 mg BID. The maximal tolerated dose (MTD) was not reached. The most common drug-related adverse events (AEs) were dyspepsia (20 %), dry skin (18 %), rash (18 %), fatigue (16 %) and nausea (13 %), mainly grade 1. Three patients (7 %) developed cutaneous squamous cell carcinoma. Photosensitivity, arthralgia and increased liver enzyme levels were each observed in only one patient each. Of 44 evaluable patients, 14 (32 %) had a partial response (melanoma and thyroid cancer). At high dose levels (>1200 mg BID), 10 of 16 (63 %) patients had a partial response. A decrease in maximum standardized uptake value (SUVmax) on FDG-PET of ≥25 % was observed in 19 of 37 patients. On-treatment reductions in pERK were documented in eight of ten paired tumor samples. CONCLUSIONS RG7256 has a favorable safety profile compared to other BRAF inhibitors while maintaining clinical activity, and MTD was not reached. The excessive pill burden needed to provide the desired exposure, and thus concerns about patient compliance, limited further development of this agent. Study Identifier: ClinicalTrials.gov (NCT01143753).
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Affiliation(s)
- Rodrigo Dienstmann
- Vall d'Hebron University Hospital, Medical Oncology, Barcelona, Spain.
- , P. Vall d'Hebron 119-129, 08035, Barcelona, Spain.
| | - Ulrik Lassen
- Department of Oncology, Rigshospitalet, Copenhagen, Denmark
| | | | | | - Michael P Brown
- Cancer Clinical Trials Unit, Royal Adelaide Hospital, Centre for Cancer Biology, SA Pathology and University of South Australia, Adelaide, Australia
| | - Stefan Evers
- Pharma Research & Early Development, Roche Innovation Center Zurich, Schlieren, Switzerland
| | - Fei Su
- Pharma Research & Early Development, Roche Innovation Center New York, New York, NY, USA
- Oncology Correlative Science Lead, Novartis Pharmaceutical Corporation, East Hanover, NJ, USA
| | - Weijiang Zhang
- Pharma Research & Early Development, Roche Innovation Center New York, New York, NY, USA
| | - Frederic Boisserie
- Pharma Research & Early Development, Roche Innovation Center New York, New York, NY, USA
| | - Brian Lestini
- Pharma Research & Early Development, Roche Innovation Center New York, New York, NY, USA
- Oncology Global Clinical Research, Bristol-Myers Squibb, New York, NY, USA
| | - Kathleen Schostack
- Pharma Research & Early Development, Roche Innovation Center New York, New York, NY, USA
- Global Development, Oncology, Bayer HealthCare Pharmaceuticals, Inc, Whippany, NJ, USA
| | - Valerie Meresse
- Pharma Research & Early Development, Roche Innovation Center Basel, Basel, Switzerland
| | - Josep Tabernero
- Vall d'Hebron University Hospital, Medical Oncology, Barcelona, Spain.
- , P. Vall d'Hebron 119-129, 08035, Barcelona, Spain.
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Capparelli C, Rosenbaum S, Berger AC, Aplin AE. Fibroblast-derived neuregulin 1 promotes compensatory ErbB3 receptor signaling in mutant BRAF melanoma. J Biol Chem 2015; 290:24267-77. [PMID: 26269601 DOI: 10.1074/jbc.m115.657270] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Indexed: 01/07/2023] Open
Abstract
Rapidly accelerated fibrosarcoma (RAF) inhibitors are first-line treatments for patients harboring V600E/K mutant BRAF melanoma. Although RAF inhibitors produce high response rates, the degree of tumor regression is heterogeneous. Compensatory/adaptive responses to targeted inhibitors are frequently initiated by the activation of growth factor receptor tyrosine kinases, including ErbB3, and factors from the tumor microenvironment may play an important role. We have shown previously that mutant v-raf murine sarcoma viral oncogene homolog B1 (BRAF) melanoma cells have enhanced activation of ErbB3 following RAF inhibition. However, the source of neuregulin 1 (NRG1), the ligand for ErbB3, is unknown. In this study, we demonstrate that NRG1 is highly expressed by dermal fibroblasts and cancer-associated fibroblasts (CAFs) isolated from mutant BRAF melanomas. Conditioned medium from fibroblasts and CAFs enhanced ErbB3 pathway activation and limited RAF inhibitor cytotoxicity in V600 mutant BRAF-harboring melanomas. Targeting the ErbB3/ErbB2 pathway partially reversed the protective effects of fibroblast/CAF-derived NRG1 on cell growth properties of RAF inhibitor-treated melanoma cells. These findings support the idea that NRG1, acting in a paracrine manner, promotes resistance to RAF inhibitors and emphasize that targeting the ErbB3/ErbB2 pathway will likely improve the efficacy of RAF inhibitors for mutant BRAF melanoma patients.
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Affiliation(s)
| | - Sheera Rosenbaum
- From the Department of Cancer Biology, Sidney Kimmel Cancer Center, and
| | - Adam C Berger
- Department of Surgery, Division of General Surgery, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
| | - Andrew E Aplin
- From the Department of Cancer Biology, Sidney Kimmel Cancer Center, and
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Uehling DE, Harris PA. Recent progress on MAP kinase pathway inhibitors. Bioorg Med Chem Lett 2015; 25:4047-56. [PMID: 26298497 DOI: 10.1016/j.bmcl.2015.07.093] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 07/11/2015] [Accepted: 07/28/2015] [Indexed: 10/23/2022]
Abstract
The RAS-RAF-MEK-ERK, or ERK signaling pathway propagates signals through an intracellular signal transduction cascade. Since approximately one third of human cancers are impacted by mutations in the ERK signaling pathway, intensive efforts to develop drugs targeting members of this cascade are ongoing. While efforts to develop drugs aimed at inhibiting RAS are still at an early stage, substantial progress in discovering clinical drugs targeting RAF, MEK, and ERK have been made. This review will highlight the recent progress in this area.
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Affiliation(s)
- David E Uehling
- Department of Drug Discovery, Ontario Institute for Cancer Research, MaRS Centre, 661 University Avenue, Suite 510, Toronto, Ontario M5G 0A3, Canada.
| | - Philip A Harris
- Pattern Recognition Receptor DPU, GlaxoSmithKline, 1250 S. Collegeville Road, Collegeville, PA 19426-0989, United States
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37
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Overcoming resistance to BRAF inhibition in BRAF-mutated metastatic melanoma. Oncotarget 2015; 5:10206-21. [PMID: 25344914 PMCID: PMC4279367 DOI: 10.18632/oncotarget.2602] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Accepted: 10/18/2014] [Indexed: 12/29/2022] Open
Abstract
Almost 50% of metastatic melanoma patients harbor a BRAF(V600) mutation and the introduction of BRAF inhibitors has improved their treatment options. BRAF inhibitors vemurafenib and dabrafenib achieved improved overall survival over chemotherapy and have been approved for the treatment of BRAF-mutated metastatic melanoma. However, most patients develop mechanisms of acquired resistance and about 15% of them do not achieve tumor regression at all, due to intrinsic resistance to therapy. Moreover, early adaptive responses limit the initial efficacy of BRAF inhibition, leading mostly to incomplete responses that may favor the selection of a sub-population of resistant clones and the acquisition of alterations that cause tumor regrowth and progressive disease. The purpose of this paper is to review the mechanisms of resistance to therapy with BRAF inhibitors and to discuss the strategies to overcome them based on pre-clinical and clinical evidences.
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38
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BRAF inhibitors: the current and the future. Curr Opin Pharmacol 2015; 23:68-73. [PMID: 26072431 DOI: 10.1016/j.coph.2015.05.015] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 05/22/2015] [Accepted: 05/26/2015] [Indexed: 01/07/2023]
Abstract
The introduction of BRAF inhibitors (BRAFi), vemurafenib and dabrafenib, revolutionized BRAFV600-mutated metastatic melanoma treatment with improved response rate and overall survival compared to standard chemotherapy. However, the mechanism related cutaneous toxicity remains a concern. In addition, intrinsic and acquired resistance remain the key challenges in BRAFi therapy. Extensive efforts to elucidate the mechanisms have led to an improved understanding of disease biology and resulted in exploration of multiple new therapeutic options. While the future looks bright with multiple new therapeutic strategies in exploration and possible new generations of BRAFi, there are questions remaining to be answered to enable more efficient use of BRAFi in cancer therapy.
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Samatar AA, Poulikakos PI. Targeting RAS-ERK signalling in cancer: promises and challenges. Nat Rev Drug Discov 2015; 13:928-42. [PMID: 25435214 DOI: 10.1038/nrd4281] [Citation(s) in RCA: 794] [Impact Index Per Article: 88.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The RAS-RAF-MEK-ERK signalling pathway is hyperactivated in a high percentage of tumours, most frequently owing to activating mutations of the KRAS, NRAS and BRAF genes. Recently, the use of compounds targeting components of ERK signalling, such as RAF or MEK inhibitors, has led to substantial improvement in clinical outcome in metastatic melanoma and has shown promising clinical activity in additional tumour types. However, response rates are highly variable and the efficacy of these drugs is primarily limited by the development of resistance. Both intrinsic and acquired resistance to RAF and MEK inhibitors are frequently associated with the persistence of ERK signalling in the presence of the drug, implying the need for more innovative approaches to target the pathway.
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Affiliation(s)
- Ahmed A Samatar
- TheraMet Biosciences, 6 Jacob Drive, Princeton Junction, New Jersey 08550, USA
| | - Poulikos I Poulikakos
- Department of Oncological Sciences and Department of Dermatology, The Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, 1470 Madison Avenue, New York, New York 10029, USA
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40
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Swaika A, Crozier JA, Joseph RW. Vemurafenib: an evidence-based review of its clinical utility in the treatment of metastatic melanoma. DRUG DESIGN DEVELOPMENT AND THERAPY 2014; 8:775-87. [PMID: 24966667 PMCID: PMC4064951 DOI: 10.2147/dddt.s31143] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The discovery of BRAF mutations in the majority of patients with metastatic melanoma combined with the identification of highly selective BRAF inhibitors have revolutionized the treatment of patients with metastatic melanoma. The first highly specific BRAF inhibitor, vemurafenib, began clinical testing in 2008 and moved towards a rapid approval in 2011. Vemurafenib induced responses in ~50% of patients with metastatic BRAF-mutant melanoma and demonstrated improved overall survival in a randomized Phase III trial. Furthermore, vemurafenib is well-tolerated with a low toxicity profile and rapid onset of action. Finally, vemurafenib is active even in patients with widely metastatic disease. Despite the success of vemurafenib in treating patients with BRAF-mutant metastatic melanoma, most, if not all, patients ultimately develop resistance resulting in disease progression at a median time of ~6 months. Multiple mechanisms of resistance have been described and rationale strategies are underway to combat resistance. This review highlights the development, clinical utility, resistance mechanisms, and future use of vemurafenib both in melanoma and other malignancies. We consulted PubMed, Scopus, MEDLINE, ASCO annual symposium abstracts, and http://clinicaltrials.gov/ for the purpose of this review.
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Affiliation(s)
- Abhisek Swaika
- Department of Hematology and Oncology, Mayo Clinic, Jacksonville, FL, USA
| | - Jennifer A Crozier
- Department of Hematology and Oncology, Mayo Clinic, Jacksonville, FL, USA
| | - Richard W Joseph
- Department of Hematology and Oncology, Mayo Clinic, Jacksonville, FL, USA
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