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Bora-Singhal N, Saha B, Mohankumar D, Padmanabhan J, Coppola D, Chellappan S. A Novel PHD2/VHL-mediated Regulation of YAP1 Contributes to VEGF Expression and Angiogenesis. Cancer Res Commun 2022; 2:624-638. [PMID: 35937460 PMCID: PMC9351435 DOI: 10.1158/2767-9764.crc-21-0084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 02/10/2022] [Accepted: 06/21/2022] [Indexed: 06/15/2023]
Abstract
The transcriptional co-activator YAP1 is the major oncogenic component of the Hippo signaling pathway and contributes to the genesis and progression of various tumors, including non-small cell lung cancer (NSCLC). YAP1 levels are regulated by the canonical Hippo kinases, MST1/2 and LATS1/2, which modulate its cytoplasmic retention and proteasomal degradation. While non-canonical regulation of YAP1 has been reported, its role in hypoxic response is not fully elucidated. The studies presented here show that YAP1 levels and function are modulated by VHL and PHD2. YAP1 could regulate multiple genes involved in angiogenesis through E2F1; it also associates with HIF1α in cancer cells under hypoxic conditions, inducing the VEGF-A promoter. Under normoxic conditions, PHD2 associates with and hydroxylates specific proline residues on YAP1, facilitating its interaction with VHL and promoting ubiquitination and subsequent proteasomal degradation. Exposure to hypoxia dissociates YAP1 from PHD2 and VHL, elevating YAP1 levels and enhancing its association with HIF1α. YAP1-HIF1α interaction was higher in NSCLC and RCC samples, indicating a role for this interaction in the genesis of these cancers. Our results thus reveal a novel mode of regulation of YAP1 by PHD2 and VHL in normoxic cells, suggesting that YAP1-mediated induction of VEGF and other genes contributes to hypoxic response in tumors.
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Affiliation(s)
| | - Biswarup Saha
- Department of Tumor Biology, Moffitt Cancer Center, Tampa, Florida
| | | | - Jaya Padmanabhan
- Department of Tumor Biology, Moffitt Cancer Center, Tampa, Florida
| | - Domenico Coppola
- Department of Anatomic pathology, Moffitt Cancer Center, Tampa, Florida
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Kumar PM, Arunthathi S, Jeevan Prasanth S, Aswin T, Anish Antony A, Daniel D, Mohankumar D, Nikhil Babu P. Investigation on a desiccant based solar water recuperator for generating water from atmospheric air. Materials Today: Proceedings 2021; 45:7881-7884. [PMID: 0 DOI: 10.1016/j.matpr.2020.12.506] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Bora-Singhal N, Mohankumar D, Saha B, Colin CM, Lee JY, Martin MW, Zheng X, Coppola D, Chellappan S. Novel HDAC11 inhibitors suppress lung adenocarcinoma stem cell self-renewal and overcome drug resistance by suppressing Sox2. Sci Rep 2020; 10:4722. [PMID: 32170113 PMCID: PMC7069992 DOI: 10.1038/s41598-020-61295-6] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 02/20/2020] [Indexed: 01/06/2023] Open
Abstract
Non-small cell lung cancer (NSCLC) is known to have poor patient outcomes due to development of resistance to chemotherapy agents and the EGFR inhibitors, which results in recurrence of highly aggressive lung tumors. Even with recent success in immunotherapy using the checkpoint inhibitors, additional investigations are essential to identify novel therapeutic strategies for efficacious treatment for NSCLC. Our finding that high levels of histone deacetylase 11 (HDAC11) in human lung tumor tissues correlate with poor patient outcome and that depletion or inhibition of HDAC11 not only significantly reduces self-renewal of cancer stem cells (CSCs) from NSCLC but also decreases Sox2 expression that is essential for maintenance of CSCs, indicates that HDAC11 is a potential target to combat NSCLC. We find that HDAC11 suppresses Sox2 expression through the mediation of Gli1, the Hedgehog pathway transcription factor. In addition, we have used highly selective HDAC11 inhibitors that not only target stemness and adherence independent growth of lung cancer cells but these inhibitors could also efficiently ablate the growth of drug-insensitive stem-like cells as well as therapy resistant lung cancer cells. These inhibitors were found to be efficacious even in presence of cancer associated fibroblasts which have been shown to contribute in therapy resistance. Our study presents a novel role of HDAC11 in lung adenocarcinoma progression and the potential use of highly selective inhibitors of HDAC11 in combating lung cancers.
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Affiliation(s)
- Namrata Bora-Singhal
- Department of Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, 12902 Magnolia Drive, Tampa, FL, 33612, USA
| | - Durairaj Mohankumar
- Department of Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, 12902 Magnolia Drive, Tampa, FL, 33612, USA
| | - Biswarup Saha
- Department of Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, 12902 Magnolia Drive, Tampa, FL, 33612, USA
| | - Christelle M Colin
- Department of Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, 12902 Magnolia Drive, Tampa, FL, 33612, USA
| | - Jennifer Y Lee
- FORMA Therapeutics, 500 Arsenal St, Suite 100, Watertown, MA, 02472, USA
| | - Matthew W Martin
- FORMA Therapeutics, 500 Arsenal St, Suite 100, Watertown, MA, 02472, USA
| | - Xiaozhang Zheng
- FORMA Therapeutics, 500 Arsenal St, Suite 100, Watertown, MA, 02472, USA
| | - Domenico Coppola
- Department of Anatomic Pathology, H. Lee Moffitt Cancer Center and Research Institute, 12902 Magnolia Drive, Tampa, FL, 33612, USA
| | - Srikumar Chellappan
- Department of Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, 12902 Magnolia Drive, Tampa, FL, 33612, USA.
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Wilson D, Cohen J, Mohankumar D. The question of public support for assisted suicide or euthanasia in Canada. BMJ Support Palliat Care 2011. [DOI: 10.1136/bmjspcare-2011-000053.139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Singhi SC, Mohankumar D, Singhi PD, Sapru S, Ganguly NK. Evaluation of polymerase chain reaction (PCR) for diagnosing Haemophilus influenzae b meningitis. Ann Trop Paediatr 2002; 22:347-53. [PMID: 12530285 DOI: 10.1179/027249302125002010] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
A polymerase chain reaction (PCR) for detecting Hib in cerebrospinal fluid (CSF) was evaluated and compared with culture and a latex agglutination test (LAT) in a hospital-based prospective surveillance. We studied 107 children aged from 1 month to 12 years with a clinical and CSF profile suggestive of acute bacterial meningitis. CSF culture was performed on blood-chocolate agar by standard technique, LAT by a commercially available kit (Wellcogen) and PCR using total DNA extracted from CSF samples. Of 107 children, 79% had received one or more doses of injectable antibiotics. Hib was detected by culture in 14 cases, by LAT in 23 and by PCR in 37. All CSF samples that reveal Hib by culture or LAT had a PCR positive for Hib (sensitivity 100%). PCR also detected 14 additional cases of Hib meningitis which were not detected by culture or LAT. We conclude that PCR is a sensitive and specific diagnostic tool that may be valuable in a population with high pre-hospital antibiotic usage.
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Affiliation(s)
- Sunit C Singhi
- Department of Pediatrics, Postgraduate Institute of Medical Education and Research, Chandigarh-160012, India.
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