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Browne IM, Okines AFC. Resistance to Targeted Inhibitors of the PI3K/AKT/mTOR Pathway in Advanced Oestrogen-Receptor-Positive Breast Cancer. Cancers (Basel) 2024; 16:2259. [PMID: 38927964 PMCID: PMC11201395 DOI: 10.3390/cancers16122259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2024] [Revised: 06/11/2024] [Accepted: 06/13/2024] [Indexed: 06/28/2024] Open
Abstract
The PI3K/AKT/mTOR signalling pathway is one of the most frequently activated pathways in breast cancer and also plays a central role in the regulation of several physiologic functions. There are major efforts ongoing to exploit precision medicine by developing inhibitors that target the three kinases (PI3K, AKT, and mTOR). Although multiple compounds have been developed, at present, there are just three inhibitors approved to target this pathway in patients with advanced ER-positive, HER2-negative breast cancer: everolimus (mTOR inhibitor), alpelisib (PIK3CA inhibitor), and capivasertib (AKT inhibitor). Like most targeted cancer drugs, resistance poses a major problem in the clinical setting and is a factor that has frequently limited the overall efficacy of these agents. Drug resistance can be categorised into intrinsic or acquired resistance depending on the timeframe it has developed within. Whereas intrinsic resistance exists prior to a specific treatment, acquired resistance is induced by a therapy. The majority of patients with ER-positive, HER2-negative advanced breast cancer will likely be offered an inhibitor of the PI3K/AKT/mTOR pathway at some point in their cancer journey, with the options available depending on the approval criteria in place and the cancer's mutation status. Within this large cohort of patients, it is likely that most will develop resistance at some point, which makes this an area of interest and an unmet need at present. Herein, we review the common mechanisms of resistance to agents that target the PI3K/AKT/mTOR signalling pathway, elaborate on current management approaches, and discuss ongoing clinical trials attempting to mitigate this significant issue. We highlight the need for additional studies into AKT1 inhibitor resistance in particular.
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2
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Domma AJ, Henderson LA, Goodrum FD, Moorman NJ, Kamil JP. Human cytomegalovirus attenuates AKT activity by destabilizing insulin receptor substrate proteins. J Virol 2023; 97:e0056323. [PMID: 37754763 PMCID: PMC10617551 DOI: 10.1128/jvi.00563-23] [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: 04/15/2023] [Accepted: 08/09/2023] [Indexed: 09/28/2023] Open
Abstract
IMPORTANCE Human cytomegalovirus (HCMV) requires inactivation of AKT to efficiently replicate, yet how AKT is shut off during HCMV infection has remained unclear. We show that UL38, an HCMV protein that activates mTORC1, is necessary and sufficient to destabilize insulin receptor substrate 1 (IRS1), a model insulin receptor substrate (IRS) protein. Degradation of IRS proteins in settings of excessive mTORC1 activity is an important mechanism for insulin resistance. When IRS proteins are destabilized, PI3K cannot be recruited to growth factor receptor complexes, and hence, AKT membrane recruitment, a rate limiting step in its activation, fails to occur. Despite its penchant for remodeling host cell signaling pathways, our results reveal that HCMV relies upon a cell-intrinsic negative regulatory feedback loop to inactivate AKT. Given that pharmacological inhibition of PI3K/AKT potently induces HCMV reactivation from latency, our findings also imply that the expression of UL38 activity must be tightly regulated within latently infected cells to avoid spontaneous reactivation.
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Affiliation(s)
- Anthony J. Domma
- Department of Microbiology and Immunology, Louisiana State University Health Sciences Center Shreveport, Shreveport, Louisiana, USA
| | - Lauren A. Henderson
- Department of Microbiology and Immunology, Louisiana State University Health Sciences Center Shreveport, Shreveport, Louisiana, USA
| | - Felicia D. Goodrum
- Department of Immunobiology, University of Arizona, Tucson, Arizona, USA
- Bio5 Institute, University of Arizona, Tucson, Arizona, USA
| | - Nathaniel J. Moorman
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Jeremy P. Kamil
- Department of Microbiology and Immunology, Louisiana State University Health Sciences Center Shreveport, Shreveport, Louisiana, USA
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3
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Smith AE, Chan S, Wang Z, McCloskey A, Reilly Q, Wang JZ, Patel HV, Koshizuka K, Soifer HS, Kessler L, Dayoub A, Villaflor V, Adkins DR, Bruce JY, Ho AL, Perez CA, Hanna GJ, Gascó Hernández A, Saunders A, Dale S, Gutkind JS, Burrows F, Malik S. Tipifarnib Potentiates the Antitumor Effects of PI3Kα Inhibition in PIK3CA- and HRAS-Dysregulated HNSCC via Convergent Inhibition of mTOR Activity. Cancer Res 2023; 83:3252-3263. [PMID: 37339176 PMCID: PMC10543974 DOI: 10.1158/0008-5472.can-23-0282] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 05/23/2023] [Accepted: 06/16/2023] [Indexed: 06/22/2023]
Abstract
Outcomes for patients with recurrent/metastatic (R/M) head and neck squamous cell carcinoma (HNSCC) are poor, with median overall survival (OS) ranging from 6 to 18 months. For those who progress on standard-of-care (chemo)immunotherapy, treatment options are limited, necessitating the development of rational therapeutic strategies. Toward this end, we targeted the key HNSCC drivers PI3K-mTOR and HRAS via the combination of tipifarnib, a farnesyltransferase (FTase) inhibitor, and alpelisib, a PI3Kα inhibitor, in multiple molecularly defined subsets of HNSCC. Tipifarnib synergized with alpelisib at the level of mTOR in PI3Kα- or HRAS-dependent HNSCCs, leading to marked cytotoxicity in vitro and tumor regression in vivo. On the basis of these findings, the KURRENT-HN trial was launched to evaluate the effectiveness of this combination in PIK3CA-mutant/amplified and/or HRAS-overexpressing R/M HNSCC. Preliminary evidence supports the clinical activity of this molecular biomarker-driven combination therapy. Combined alpelisib and tipifarnib has potential to benefit >45% of patients with R/M HNSCC. By blocking feedback reactivation of mTORC1, tipifarnib may prevent adaptive resistance to additional targeted therapies, enhancing their clinical utility. SIGNIFICANCE The mechanistically designed, biomarker-matched strategy of combining alpelisib and tipifarnib is efficacious in PIK3CA- and HRAS-dysregulated head and neck squamous carcinoma and could improve outcomes for many patients with recurrent, metastatic disease. See related commentary by Lee et al., p. 3162.
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Affiliation(s)
| | | | - Zhiyong Wang
- Moores Cancer Center, University of California San Diego, La Jolla, California
| | | | | | | | | | - Keiichi Koshizuka
- Moores Cancer Center, University of California San Diego, La Jolla, California
| | | | | | | | | | | | | | - Alan L. Ho
- Memorial Sloan Kettering Cancer Center, New York, New York
| | - Cesar A. Perez
- Sarah Cannon Research Institute at Florida Cancer Specialists, Orlando, Florida
| | | | | | | | | | - J. Silvio Gutkind
- Moores Cancer Center, University of California San Diego, La Jolla, California
- Department of Pharmacology, University of California San Diego, La Jolla, California
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4
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Zhou X, Zhu H, Luo C, Xiao H, Zou X, Zou J, Zhang G. Targeting integrin α5β1 in urological tumors: opportunities and challenges. Front Oncol 2023; 13:1165073. [PMID: 37483505 PMCID: PMC10358839 DOI: 10.3389/fonc.2023.1165073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 06/16/2023] [Indexed: 07/25/2023] Open
Abstract
Urological tumors, such as prostate cancer, renal cell carcinoma, and bladder cancer, have shown a significant rise in prevalence in recent years and account for a significant proportion of malignant tumors. It has been established that metastasis to distant organs caused by urological tumors is the main cause of death, although the mechanisms underlying metastasis have not been fully elucidated. The fibronectin receptor integrin α5β1 reportedly plays an important role in distant metastasis and is closely related to tumor development. It is widely thought to be an important cancer mediator by interacting with different ligands, mediating tumor adhesion, invasion, and migration, and leading to immune escape. In this paper, we expound on the relationship and regulatory mechanisms of integrin α5β1 in these three cancers. In addition, the clinical applications of integrin α5β1 in these cancers, especially against treatment resistance, are discussed. Last but not least, the possibility of integrin α5β1 as a potential target for treatment is examined, with new ideas for future research being proposed.
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Affiliation(s)
- Xuming Zhou
- The First Clinical College, Gannan Medical University, Ganzhou, China
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Hezhen Zhu
- The First Clinical College, Gannan Medical University, Ganzhou, China
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Cong Luo
- The First Clinical College, Gannan Medical University, Ganzhou, China
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, China
| | - Huan Xiao
- The First Clinical College, Gannan Medical University, Ganzhou, China
| | - Xiaofeng Zou
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, China
- Institute of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, China
- Jiangxi Engineering Technology Research Center of Calculi Prevention, Ganzhou, China
| | - Junrong Zou
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, China
- Institute of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, China
- Jiangxi Engineering Technology Research Center of Calculi Prevention, Ganzhou, China
| | - Guoxi Zhang
- Department of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, China
- Institute of Urology, The First Affiliated Hospital of Gannan Medical University, Ganzhou, China
- Jiangxi Engineering Technology Research Center of Calculi Prevention, Ganzhou, China
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5
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Patanè GT, Putaggio S, Tellone E, Barreca D, Ficarra S, Maffei C, Calderaro A, Laganà G. Catechins and Proanthocyanidins Involvement in Metabolic Syndrome. Int J Mol Sci 2023; 24:ijms24119228. [PMID: 37298181 DOI: 10.3390/ijms24119228] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Revised: 05/19/2023] [Accepted: 05/22/2023] [Indexed: 06/12/2023] Open
Abstract
Recent studies on natural antioxidant compounds have highlighted their potentiality against various pathological conditions. The present review aims to selectively evaluate the benefits of catechins and their polymeric structure on metabolic syndrome, a common disorder characterized by a cluster of three main risk factors: obesity, hypertension, and hyperglycemia. Patients with metabolic syndrome suffer chronic low inflammation state and oxidative stress both conditions effectively countered by flavanols and their polymers. The mechanism behind the activity of these molecules has been highlighted and correlated with the characteristic features present on their basic flavonoidic skelethon, as well as the efficient doses needed to perform their activity in both in vitro and in vivo studies. The amount of evidence provided in this review offers a starting point for flavanol dietary supplementation as a potential strategy to counteract several metabolic targets associated with metabolic syndrome and suggests a key role of albumin as flavanol-delivery system to the different target of action inside the organism.
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Affiliation(s)
- Giuseppe Tancredi Patanè
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Stefano Putaggio
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Ester Tellone
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Davide Barreca
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Silvana Ficarra
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Carlo Maffei
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Antonella Calderaro
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Giuseppina Laganà
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina, Italy
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Sanz‐Castillo B, Hurtado B, Vara‐Ciruelos D, El Bakkali A, Hermida D, Salvador‐Barbero B, Martínez‐Alonso D, González‐Martínez J, Santiveri C, Campos‐Olivas R, Ximénez‐Embún P, Muñoz J, Álvarez‐Fernández M, Malumbres M. The MASTL/PP2A cell cycle kinase-phosphatase module restrains PI3K-Akt activity in an mTORC1-dependent manner. EMBO J 2023; 42:e110833. [PMID: 36354735 PMCID: PMC9841333 DOI: 10.15252/embj.2022110833] [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: 02/01/2022] [Revised: 10/24/2022] [Accepted: 10/24/2022] [Indexed: 11/11/2022] Open
Abstract
The AKT-mTOR pathway is a central regulator of cell growth and metabolism. Upon sustained mTOR activity, AKT activity is attenuated by a feedback loop that restrains upstream signaling. However, how cells control the signals that limit AKT activity is not fully understood. Here, we show that MASTL/Greatwall, a cell cycle kinase that supports mitosis by phosphorylating the PP2A/B55 inhibitors ENSA/ARPP19, inhibits PI3K-AKT activity by sustaining mTORC1- and S6K1-dependent phosphorylation of IRS1 and GRB10. Genetic depletion of MASTL results in an inefficient feedback loop and AKT hyperactivity. These defects are rescued by the expression of phosphomimetic ENSA/ARPP19 or inhibition of PP2A/B55 phosphatases. MASTL is directly phosphorylated by mTORC1, thereby limiting the PP2A/B55-dependent dephosphorylation of IRS1 and GRB10 downstream of mTORC1. Downregulation of MASTL results in increased glucose uptake in vitro and increased glucose tolerance in adult mice, suggesting the relevance of the MASTL-PP2A/B55 kinase-phosphatase module in controlling AKT and maintaining metabolic homeostasis.
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Affiliation(s)
- Belén Sanz‐Castillo
- Cell Division and Cancer GroupSpanish National Cancer Research Centre (CNIO)MadridSpain
| | - Begoña Hurtado
- Cell Division and Cancer GroupSpanish National Cancer Research Centre (CNIO)MadridSpain
| | - Diana Vara‐Ciruelos
- Cell Division and Cancer GroupSpanish National Cancer Research Centre (CNIO)MadridSpain
| | - Aicha El Bakkali
- Cell Division and Cancer GroupSpanish National Cancer Research Centre (CNIO)MadridSpain
| | - Dario Hermida
- Cell Division and Cancer GroupSpanish National Cancer Research Centre (CNIO)MadridSpain
| | | | - Diego Martínez‐Alonso
- Cell Division and Cancer GroupSpanish National Cancer Research Centre (CNIO)MadridSpain
| | | | - Clara Santiveri
- Spectroscopy and Nuclear Magnetic Resonance UnitSpanish National Cancer Research Centre (CNIO)MadridSpain
| | - Ramón Campos‐Olivas
- Spectroscopy and Nuclear Magnetic Resonance UnitSpanish National Cancer Research Centre (CNIO)MadridSpain
| | | | - Javier Muñoz
- Proteomics UnitSpanish National Cancer Research Centre (CNIO)MadridSpain
| | - Mónica Álvarez‐Fernández
- Cell Division and Cancer GroupSpanish National Cancer Research Centre (CNIO)MadridSpain
- Instituto de Investigación Sanitaria del Principado de Asturias (ISPA)Instituto Universitario de Oncología del Principado de Asturias (IUOPA)OviedoSpain
| | - Marcos Malumbres
- Cell Division and Cancer GroupSpanish National Cancer Research Centre (CNIO)MadridSpain
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7
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Nutrigenomic Effects of White Rice and Brown Rice on the Pathogenesis of Metabolic Disorders in a Fruit Fly Model. Molecules 2023; 28:molecules28020532. [PMID: 36677591 PMCID: PMC9865196 DOI: 10.3390/molecules28020532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 12/24/2022] [Accepted: 12/30/2022] [Indexed: 01/06/2023] Open
Abstract
Consumption of white rice (WR) has been shown to predispose individuals to metabolic disorders. However, brown rice (BR), which is relatively richer in bioactive compounds, possesses anti-glycaemic and antioxidant effects. In this study, fifteen cultivars of paddy rice that are predominantly consumed in North West Nigeria were analysed for their nutritional composition, bioactive contents and effects on metabolic outcomes in a fruit fly model. Gene expression analyses were conducted on the whole fly, targeting dPEPCK, dIRS, and dACC. The protein, carbohydrate, and fibre contents and bioactives of all BR cultivars were significantly different (p < 0.05) from the WR cultivars. Moreover, it was demonstrated that the glucose and trehalose levels were significantly higher (p < 0.05), while glycogen was significantly lower (p < 0.05) in the WR groups compared to the BR groups. Similarly, the expression of dACC and dPEPCK was upregulated, while that of dIRS was downregulated in the WR groups compared to the BR groups. Sex differences (p < 0.05) were observed in the WR groups in relation to the nutrigenomic effects. Our findings confirm metabolic perturbations in fruit flies following consumption of WR via distortion of insulin signalling and activation of glycogenolysis and gluconeogenesis. BR prevented these metabolic changes possibly due to its richer nutritional composition.
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8
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Dotzert MS, McDonald MW, Olver TD, Sammut MJ, Melling CWJ. The influence of exercise training versus intensive insulin therapy on insulin resistance development in type 1 diabetes. J Diabetes Complications 2023; 37:108365. [PMID: 36463707 DOI: 10.1016/j.jdiacomp.2022.108365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 10/26/2022] [Accepted: 11/25/2022] [Indexed: 11/29/2022]
Abstract
The etiology of insulin resistance (IR) in Type 1 Diabetes (T1D) is unclear; however, intramyocellular lipids (IMCL) are likely contributors. While exercise lessens IR and IMCL content; T1D patients elevate glycemia to offset exercise-induced hypoglycemic risk. The preferred treatment for T1D patients is tight glucose management through intensive insulin therapy (IIT); however, IIT is accompanied with a sedentary lifestyle. The purpose of this study was to examine IR development and IMCL in combined exercise (DARE; aerobic/resistance) and IIT-treated T1D animals. 76 rats were divided into control sedentary (C), diabetic sedentary (CD), diabetes sedentary intensive insulin therapy (DIT) and DARE groups. Following streptozotocin (STZ), glycemia was maintained at either 9-15 mM (CD, DARE) or 5-9 mM (DIT) using insulin. DARE alternated between running and weighted climbing for 12 weeks. Results demonstrate that DARE exhibited reduced onset of IR compared with C, DIT and CD, indicated by increased glucose infusion rate (hyperinsulinemic-euglycemic-clamp). A shift in lipid metabolism was evident whereby diacylglycerol was elevated in DIT compared to DARE, while triacylglycerol was elevated in DARE. These findings indicate enhanced IMCL metabolism and the sequestration of fat as neutral triacylglycerol leads to reduced IR in DARE. In contrast, IIT and sedentary behavior leads to diacylglycerol accumulation and IR.
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Affiliation(s)
- Michelle S Dotzert
- Exercise Biochemistry Laboratory, School of Kinesiology, Western University, London, ON, Canada
| | - Matthew W McDonald
- Exercise Biochemistry Laboratory, School of Kinesiology, Western University, London, ON, Canada
| | - T Dylan Olver
- Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, Canada
| | - Mitchell J Sammut
- Exercise Biochemistry Laboratory, School of Kinesiology, Western University, London, ON, Canada
| | - C W James Melling
- Exercise Biochemistry Laboratory, School of Kinesiology, Western University, London, ON, Canada; Department of Physiology and Pharmacology, Schulich School of Medicine, Western University, London, ON, Canada.
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9
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Rajdev L, Lee JW, Libutti SK, Benson AB, Fisher GA, Kunz PL, Hendifar AE, Catalano P, O'Dwyer PJ. A phase II study of sapanisertib (TAK-228) a mTORC1/2 inhibitor in rapalog-resistant advanced pancreatic neuroendocrine tumors (PNET): ECOG-ACRIN EA2161. Invest New Drugs 2022; 40:1306-1314. [PMID: 36264382 PMCID: PMC9795724 DOI: 10.1007/s10637-022-01311-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 10/04/2022] [Indexed: 12/31/2022]
Abstract
This was a two-stage phase II trial of a mTORC1/2 inhibitor (mTORC: mammalian target of rapamycin complex) Sapanisertib (TAK228) in patients with rapalog-resistant pancreatic neuroendocrine tumors (PNETs) (NCT02893930). Approved rapalogs such as everolimus inhibit mTORC1 and have limited clinical activity, possibly due to compensatory feedback loops. Sapanisertib addresses the potential for incomplete inhibition of the mTOR pathway through targeting of both mTORC1 and mTORC2, and thus to reverse resistance to earlier rapamycin analogues. In stage 1, patients received sapanisertib 3 mg by mouth once daily on a continuous dosing schedule in 28-day cycle. This trial adopted a two-stage design with the primary objective of evaluating objective tumor response. The first stage would recruit 13 patients in order to accrue 12 eligible and treated patients. If among the 12 eligible patients at least 1 patient had an objective response to therapy, the study would move to the second stage of accrual where 25 eligible and treated patients would be enrolled. This study activated on February 1, 2017, the required pre-determined number of patients (n = 13) had entered by November 5, 2018 for the first stage response evaluation. The accrual of this trial was formally terminated on December 27, 2019 as no response had been observed after the first stage accrual. Treatment-related grade 3 adverse events were reported in eight (61%) patients with hyperglycemia being the most frequent, in three patients (23%). Other toxicities noted in the trial included fatigue, rash diarrhea, nausea, and vomiting. The median PFS was 5.19 months (95% CI [3.84, 9.30]) and the median OS was 20.44 months (95% CI [5.65, 22.54]). Due to the lack of responses in Stage 1 of the study, the study did not proceed to stage 2. Thus the potential to reverse resistance was not evident.
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Affiliation(s)
- Lakshmi Rajdev
- Zucker School of Medicine at Hofstra, Hempstead, NY, USA.
| | - Ju-Whei Lee
- Dana Farber Cancer Institute - ECOG-ACRIN Biostatistics Center, Boston, MA, USA
| | | | | | | | | | | | - Paul Catalano
- Dana Farber Cancer Institute - ECOG-ACRIN Biostatistics Center, Boston, MA, USA
| | - Peter J O'Dwyer
- University of Pennsylvania/Abramson Cancer Center, Philadelphia, PA, USA
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10
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Jones FK, Phillips A, Jones AR, Pisconti A. The INSR/AKT/mTOR pathway regulates the pace of myogenesis in a syndecan-3-dependent manner. Matrix Biol 2022; 113:61-82. [PMID: 36152781 DOI: 10.1016/j.matbio.2022.09.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 09/08/2022] [Accepted: 09/19/2022] [Indexed: 11/25/2022]
Abstract
Muscle stem cells (MuSCs) are indispensable for muscle regeneration. A multitude of extracellular stimuli direct MuSC fate decisions from quiescent progenitors to differentiated myocytes. The activity of these signals is modulated by coreceptors such as syndecan-3 (SDC3). We investigated the global landscape of SDC3-mediated regulation of myogenesis using a phosphoproteomics approach which revealed, with the precision level of individual phosphosites, the large-scale extent of SDC3-mediated regulation of signal transduction in MuSCs. We then focused on INSR/AKT/mTOR as a key pathway regulated by SDC3 during myogenesis and mechanistically dissected SDC3-mediated inhibition of insulin receptor signaling in MuSCs. SDC3 interacts with INSR ultimately limiting signal transduction via AKT/mTOR. Both knockdown of INSR and inhibition of AKT rescue Sdc3-/- MuSC differentiation to wild type levels. Since SDC3 is rapidly downregulated at the onset of differentiation, our study suggests that SDC3 acts a timekeeper to restrain proliferating MuSC response and prevent premature differentiation.
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Affiliation(s)
- Fiona K Jones
- Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY, USA
| | - Alexander Phillips
- School of Electrical Engineering, Electronics and Computer Science, University of Liverpool, Liverpool, UK
| | - Andrew R Jones
- Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, UK
| | - Addolorata Pisconti
- Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY, USA.
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11
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Zhang C, Wang H. Accurate treatment of small cell lung cancer: Current progress, new challenges and expectations. Biochim Biophys Acta Rev Cancer 2022; 1877:188798. [PMID: 36096336 DOI: 10.1016/j.bbcan.2022.188798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 08/19/2022] [Accepted: 09/05/2022] [Indexed: 11/28/2022]
Abstract
Small cell lung cancer (SCLC) is a deadly disease with poor prognosis. Fast growing speed, inclination to metastasis, enrichment in cancer stem cells altogether constitute its aggressive nature. In stark contrast to non-small cell lung cancer (NSCLC) that strides vigorously on the road to precision oncology, SCLC has been on the embryonic path to achieve effective personalized treatments. The survival of patients with SCLC have not been improved greatly, which could be possibly due to our inadequate understanding of genetic alterations of SCLC. Recently, encouraging effects have been observed in patients with SCLC undergoing immunotherapy. However, exciting results have only been observed in a small fraction of patients with SCLC, warranting biomarkers predictive of responses as well as novel therapeutic strategies. In addition, SCLC has previously been viewed to be homogeneous. However, perspectives have been changed thanks to the advances in sequencing techniques and platforms, which unfolds the complex heterogeneity of SCLC both genetically and non-genetically, rendering the treatment of SCLC a further step forward into the precision era. To outline the road of SCLC towards precision oncology, we summarize the progresses and achievements made in precision treatment in SCLC in genomic, transcriptomic, epigenetic, proteomic and metabolic dimensions. Moreover, we conclude relevant therapeutic vulnerabilities in SCLC. Clinically tested drugs and clinical trials have also been demonstrated. Ultimately, we look into the opportunities and challenges ahead to advance the individualized treatment in pursuit of improved survival for patients with SCLC.
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Affiliation(s)
- Chenyue Zhang
- Department of Integrated Therapy, Fudan University Shanghai Cancer Center, Shanghai Medical College, Shanghai, China
| | - Haiyong Wang
- Department of Internal Medicine-Oncology, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China.
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12
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Abstract
The protein kinase Akt broadly impacts many cellular processes, including mRNA translation, metabolism, apoptosis, and stress responses. Inhibition of phosphatidylinositol 3-kinase (PI3K), a lipid kinase pivotal to Akt activation, triggers various herpesviruses to reactivate from latency. Hence, decreased Akt activity may promote lytic replication. Here, we show that Akt accumulates in an inactive form during human cytomegalovirus (HCMV) infection of permissive fibroblasts, as indicated by hypophosphorylation of sites that activate Akt, decreased phosphorylation of PRAS40, and pronounced nuclear localization of FoxO3a, a substrate that remains cytoplasmic when Akt is active. HCMV strongly activates mTORC1 during lytic infection, suggesting a potential mechanism for Akt inactivation, since mTORC1 negatively regulates PI3K. However, we were surprised to observe that constitutive Akt activity, provided by expression of Akt fused to a myristoylation signal (myr-Akt), caused a 1-log decrease in viral replication, accompanied by defects in viral DNA synthesis and late gene expression. These results indicated that Akt inactivation is required for efficient viral replication, prompting us to address which Akt substrates underpin this requirement. Interestingly, we found that short interfering RNA knockdown of FoxO3a, but not FoxO1, phenocopied the defects caused by myr-Akt, corroborating a role for FoxO3a. Accordingly, a chimeric FoxO3a-estrogen receptor fusion protein, in which nuclear localization is regulated by 4-hydroxytamoxifen instead of Akt, reversed the replication defects caused by myr-Akt. Collectively, our results reveal a role for FoxO transcription factors in HCMV lytic replication and argue that this single class of Akt substrates underpins the requirement for Akt inactivation during productive infection.
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13
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Buel GR, Dang H, Asara JM, Blenis J, Mutvei AP. Prolonged deprivation of arginine or leucine induces PI3K/Akt-dependent reactivation of mTORC1. J Biol Chem 2022; 298:102030. [PMID: 35577075 PMCID: PMC9194872 DOI: 10.1016/j.jbc.2022.102030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 05/05/2022] [Accepted: 05/08/2022] [Indexed: 01/08/2023] Open
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14
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Cullin neddylation inhibitor attenuates hyperglycemia by enhancing hepatic insulin signaling through insulin receptor substrate stabilization. Proc Natl Acad Sci U S A 2022; 119:2111737119. [PMID: 35115401 PMCID: PMC8832973 DOI: 10.1073/pnas.2111737119] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/27/2021] [Indexed: 12/15/2022] Open
Abstract
Hepatic insulin resistance is a hallmark feature of nonalcoholic fatty liver disease and type-2 diabetes and significantly contributes to systemic insulin resistance. Abnormal activation of nutrient and stress-sensing kinases leads to serine/threonine phosphorylation of insulin receptor substrate (IRS) and subsequent IRS proteasome degradation, which is a key underlying cause of hepatic insulin resistance. Recently, members of the cullin-RING E3 ligases (CRLs) have emerged as mediators of IRS protein turnover, but the pathophysiological roles and therapeutic implications of this cellular signaling regulation is largely unknown. CRLs are activated upon cullin neddylation, a process of covalent conjugation of a ubiquitin-like protein called Nedd8 to a cullin scaffold. Here, we report that pharmacological inhibition of cullin neddylation by MLN4924 (Pevonedistat) rapidly decreases hepatic glucose production and attenuates hyperglycemia in mice. Mechanistically, neddylation inhibition delays CRL-mediated IRS protein turnover to prolong insulin action in hepatocytes. In vitro knockdown of either cullin 1 or cullin 3, but not other cullin members, attenuates insulin-induced IRS protein degradation and enhances cellular insulin signaling activation. In contrast, in vivo knockdown of liver cullin 3, but not cullin 1, stabilizes hepatic IRS and decreases blood glucose, which recapitulates the effect of MLN4924 treatment. In summary, these findings suggest that pharmacological inhibition of cullin neddylation represents a therapeutic approach for improving hepatic insulin signaling and lowering blood glucose.
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15
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Truong D, Cherradi-Lamhamedi SE, Ludwig JA. Targeting the IGF/PI3K/mTOR Pathway and AXL/YAP1/TAZ pathways in Primary Bone Cancer. J Bone Oncol 2022; 33:100419. [PMID: 35251924 PMCID: PMC8892134 DOI: 10.1016/j.jbo.2022.100419] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 02/21/2022] [Accepted: 02/22/2022] [Indexed: 12/14/2022] Open
Abstract
Primary bone cancers (PBC) belong to the family of mesenchymal tumors classified based on their cellular origin, extracellular matrix, genetic regulation, and epigenetic modification. The three major PBC types, Ewing sarcoma, osteosarcoma, and chondrosarcoma, are frequently aggressive tumors, highly metastatic, and typically occur in children and young adults. Despite their distinct origins and pathogenesis, these sarcoma subtypes rely upon common signaling pathways to promote tumor progression, metastasis, and survival. The IGF/PI3K/mTOR and AXL/YAP/TAZ pathways, in particular, have gained significant attention recently given their ties to oncogenesis, cell fate and differentiation, metastasis, and drug resistance. Naturally, these pathways – and their protein constituents – have caught the eye of the pharmaceutical industry, and a wide array of small molecule inhibitors and antibody drug-conjugates have emerged. Here, we review how the IGF/PI3K/mTOR and AXL/YAP/TAZ pathways promote PBC and highlight the drug candidates under clinical trial investigation.
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16
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Gallo M, Adinolfi V, Barucca V, Prinzi N, Renzelli V, Barrea L, Di Giacinto P, Ruggeri RM, Sesti F, Arvat E, Baldelli R, Arvat E, Colao A, Isidori A, Lenzi A, Baldell R, Albertelli M, Attala D, Bianchi A, Di Sarno A, Feola T, Mazziotti G, Nervo A, Pozza C, Puliani G, Razzore P, Ramponi S, Ricciardi S, Rizza L, Rota F, Sbardella E, Zatelli MC. Expected and paradoxical effects of obesity on cancer treatment response. Rev Endocr Metab Disord 2021; 22:681-702. [PMID: 33025385 DOI: 10.1007/s11154-020-09597-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/25/2020] [Indexed: 12/12/2022]
Abstract
Obesity, whose prevalence is pandemic and continuing to increase, is a major preventable and modifiable risk factor for diabetes and cardiovascular diseases, as well as for cancer. Furthermore, epidemiological studies have shown that obesity is a negative independent prognostic factor for several oncological outcomes, including overall and cancer-specific survival, for several site-specific cancers as well as for all cancers combined. Yet, a recently growing body of evidence suggests that sometimes overweight and obesity may associate with better outcomes, and that immunotherapy may show improved response among obese patients compared with patients with a normal weight. The so-called 'obesity paradox' has been reported in several advanced cancer as well as in other diseases, albeit the mechanisms behind this unexpected relationship are still not clear. Aim of this review is to explore the expected as well as the paradoxical relationship between obesity and cancer prognosis, with a particular emphasis on the effects of cancer therapies in obese people.
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Affiliation(s)
- Marco Gallo
- Oncological Endocrinology Unit, Department of Medical Sciences, University of Turin, AOU Città della Salute e della Scienza di Torino, Via Genova, 3, 10126, Turin, Italy.
| | - Valerio Adinolfi
- Endocrinology and Diabetology Unit, ASL Verbano Cusio Ossola, Domodossola, Italy
| | - Viola Barucca
- Oncology Unit, Department of Oncology and Medical Specialities, AO San Camillo-Forlanini, Rome, Italy
| | - Natalie Prinzi
- ENETS Center of Excellence, Department of Medical Oncology, Fondazione IRCCS Istituto Nazionale Tumori Milano, Milan, Italy
| | - Valerio Renzelli
- Department of Experimental Medicine, AO S. Andrea, Sapienza University of Rome, Rome, Italy
| | - Luigi Barrea
- Endocrinology Unit, Department of Clinical Medicine and Surgery, Federico II University Medical School of Naples, Naples, Italy
| | - Paola Di Giacinto
- Endocrinology Unit, Department of Oncology and Medical Specialities, AO San Camillo-Forlanini, Rome, Italy
| | - Rosaria Maddalena Ruggeri
- Endocrine Unit, Department of Clinical and Experimental Medicine, University of Messina, AOU Policlinico G. Martino, Messina, Italy
| | - Franz Sesti
- Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy
| | - Emanuela Arvat
- Oncological Endocrinology Unit, Department of Medical Sciences, University of Turin, AOU Città della Salute e della Scienza di Torino, Via Genova, 3, 10126, Turin, Italy
| | - Roberto Baldelli
- Endocrinology Unit, Department of Oncology and Medical Specialities, AO San Camillo-Forlanini, Rome, Italy
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17
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Rubina KA, Semina EV, Kalinina NI, Sysoeva VY, Balatskiy AV, Tkachuk VA. Revisiting the multiple roles of T-cadherin in health and disease. Eur J Cell Biol 2021; 100:151183. [PMID: 34798557 DOI: 10.1016/j.ejcb.2021.151183] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 11/08/2021] [Accepted: 11/08/2021] [Indexed: 01/02/2023] Open
Abstract
As a non-canonical member of cadherin superfamily, T-cadherin was initially described as a molecule involved in homophilic recognition in the nervous and vascular systems. The ensuing decades clearly demonstrated that T-cadherin is a remarkably multifunctional molecule. It was validated as a bona fide receptor for both: LDL exerting adverse atherogenic action and adiponectin mediating many protective metabolic and cardiovascular effects. Motivated by the latest progress and accumulated data unmasking important roles of T-cadherin in blood vessel function and tissue regeneration, here we revisit the original function of T-cadherin as a guidance receptor for the growing axons and blood vessels, consider the recent data on T-cadherin-induced exosomes' biogenesis and their role in myocardial regeneration and revascularization. The review expands upon T-cadherin contribution to mesenchymal stem/stromal cell compartment in adipose tissue. We also dwell upon T-cadherin polymorphisms (SNP) and their possible therapeutic applications. Furthermore, we scrutinize the molecular hub of insulin and adiponectin receptors (AdipoR1 and AdipoR2) conveying signals to their downstream targets in quest for defining a putative place of T-cadherin in this molecular circuitry.
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Affiliation(s)
- K A Rubina
- Faculty of Medicine, Lomonosov Moscow State University, 119192 Moscow, Russia.
| | - E V Semina
- Institute of Experimental Cardiology, National Cardiology Research Center of the Ministry of Health of the Russian Federation, 121552 Moscow, Russia
| | - N I Kalinina
- Faculty of Medicine, Lomonosov Moscow State University, 119192 Moscow, Russia
| | - V Yu Sysoeva
- Faculty of Medicine, Lomonosov Moscow State University, 119192 Moscow, Russia
| | - A V Balatskiy
- Faculty of Medicine, Lomonosov Moscow State University, 119192 Moscow, Russia
| | - V A Tkachuk
- Faculty of Medicine, Lomonosov Moscow State University, 119192 Moscow, Russia; Institute of Experimental Cardiology, National Cardiology Research Center of the Ministry of Health of the Russian Federation, 121552 Moscow, Russia
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18
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Zhou B, Zhang Y, Li S, Wu L, Fejes-Toth G, Naray-Fejes-Toth A, Soukas AA. Serum- and glucocorticoid-induced kinase drives hepatic insulin resistance by directly inhibiting AMP-activated protein kinase. Cell Rep 2021; 37:109785. [PMID: 34610303 PMCID: PMC8576737 DOI: 10.1016/j.celrep.2021.109785] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 08/05/2021] [Accepted: 09/10/2021] [Indexed: 12/01/2022] Open
Abstract
A hallmark of type 2 diabetes (T2D) is hepatic resistance to insulin's glucose-lowering effects. The serum- and glucocorticoid-regulated family of protein kinases (SGK) is activated downstream of mechanistic target of rapamycin complex 2 (mTORC2) in response to insulin in parallel to AKT. Surprisingly, despite an identical substrate recognition motif to AKT, which drives insulin sensitivity, pathological accumulation of SGK1 drives insulin resistance. Liver-specific Sgk1-knockout (Sgk1Lko) mice display improved glucose tolerance and insulin sensitivity and are protected from hepatic steatosis when fed a high-fat diet. Sgk1 promotes insulin resistance by inactivating AMP-activated protein kinase (AMPK) via phosphorylation on inhibitory site AMPKαSer485/491. We demonstrate that SGK1 is dominant among SGK family kinases in regulation of insulin sensitivity, as Sgk1, Sgk2, and Sgk3 triple-knockout mice have similar increases in hepatic insulin sensitivity. In aggregate, these data suggest that targeting hepatic SGK1 may have therapeutic potential in T2D.
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Affiliation(s)
- Ben Zhou
- Department of Medicine, Diabetes Unit and Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Medicine, Harvard Medical School, Boston, MA 02114, USA; Broad Institute of Harvard and MIT, Cambridge, MA 02142, USA; CAS Key Laboratory of Nutrition, Metabolism and Food Safety, Shanghai Institute of Nutrition and Health, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, 200031, China.
| | - Yuyao Zhang
- Department of Medicine, Diabetes Unit and Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Medicine, Harvard Medical School, Boston, MA 02114, USA; Broad Institute of Harvard and MIT, Cambridge, MA 02142, USA
| | - Sainan Li
- Department of Medicine, Diabetes Unit and Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Medicine, Harvard Medical School, Boston, MA 02114, USA; Broad Institute of Harvard and MIT, Cambridge, MA 02142, USA
| | - Lianfeng Wu
- Institute of Basic Medical Sciences, Westlake Institute for Advanced Study, School of Life Sciences, Westlake University, Hangzhou, 310024, China
| | - Geza Fejes-Toth
- Department of Molecular and Systems Biology, Geisel School of Medicine at Dartmouth, Hanover, NH, 03755, USA
| | - Aniko Naray-Fejes-Toth
- Department of Molecular and Systems Biology, Geisel School of Medicine at Dartmouth, Hanover, NH, 03755, USA
| | - Alexander A Soukas
- Department of Medicine, Diabetes Unit and Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Medicine, Harvard Medical School, Boston, MA 02114, USA; Broad Institute of Harvard and MIT, Cambridge, MA 02142, USA.
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19
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O'Reilly CL, Uranga S, Fluckey JD. Culprits or consequences: Understanding the metabolic dysregulation of muscle in diabetes. World J Biol Chem 2021; 12:70-86. [PMID: 34630911 PMCID: PMC8473417 DOI: 10.4331/wjbc.v12.i5.70] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 06/21/2021] [Accepted: 08/03/2021] [Indexed: 02/06/2023] Open
Abstract
The prevalence of type 2 diabetes (T2D) continues to rise despite the amount of research dedicated to finding the culprits of this debilitating disease. Skeletal muscle is arguably the most important contributor to glucose disposal making it a clear target in insulin resistance and T2D research. Within skeletal muscle there is a clear link to metabolic dysregulation during the progression of T2D but the determination of culprits vs consequences of the disease has been elusive. Emerging evidence in skeletal muscle implicates influential cross talk between a key anabolic regulatory protein, the mammalian target of rapamycin (mTOR) and its associated complexes (mTORC1 and mTORC2), and the well-described canonical signaling for insulin-stimulated glucose uptake. This new understanding of cellular signaling crosstalk has blurred the lines of what is a culprit and what is a consequence with regard to insulin resistance. Here, we briefly review the most recent understanding of insulin signaling in skeletal muscle, and how anabolic responses favoring anabolism directly impact cellular glucose disposal. This review highlights key cross-over interactions between protein and glucose regulatory pathways and the implications this may have for the design of new therapeutic targets for the control of glucoregulatory function in skeletal muscle.
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Affiliation(s)
| | - Selina Uranga
- Health and Kinesiology, Texas A&M University, TX 77843, United States
| | - James D Fluckey
- Health and Kinesiology, Texas A&M University, TX 77843, United States
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20
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Mansour HM, Fawzy HM, El-Khatib AS, Khattab MM. Inhibition of mitochondrial pyruvate carrier 1 by lapatinib ditosylate mitigates Alzheimer's-like disease in D-galactose/ovariectomized rats. Neurochem Int 2021; 150:105178. [PMID: 34481907 DOI: 10.1016/j.neuint.2021.105178] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 08/19/2021] [Accepted: 09/01/2021] [Indexed: 11/26/2022]
Abstract
Mitochondrial, autophagic impairment, excitotoxicity, and also neuroinflammation are implicated in Alzheimer's disease (AD) pathophysiology. We postulated that inhibiting the mitochondrial pyruvate carrier-1 (MPC-1), which inhibits the activation of the mammalian target of rapamycin (mTOR), may ameliorate the neurodegeneration of hippocampal neurons in the rat AD model. To assess this, we used lapatinib ditosylate (LAP), an anti-cancer drug that inhibits MPC-1 through suppression of estrogen-related receptor-alpha (ERR-α), in D-galactose/ovariectomized rats. AD characteristics were developed in ovariectomized (OVX) rats following an 8-week injection of D-galactose (D-gal) (150 mg/kg, i.p.). The human epidermal growth factor receptor-2 (HER-2) inhibitor, LAP (100 mg/kg, p.o.) was daily administered for 3 weeks. LAP protected against D-gal/OVX-induced changes in cortical and hippocampal neurons along with improvement in learning and memory, as affirmed using Morris water maze (MWM) and novel object recognition (NOR) tests. Furthermore, LAP suppressed the hippocampal expression of Aβ1-42, p-tau, HER-2, p-mTOR, GluR-II, TNF-α, P38-MAPK, NOX-1, ERR-α, and MPC-1. Also, LAP treatment leads to activation of the pro-survival PI3K/Akt pathway. As an epilogue, targeting MPC-1 in the D-gal-induced AD in OVX rats resulted in the enhancement of autophagy, and suppression of neuroinflammation and excitotoxicity. Our work proves that alterations in metabolic signaling as a result of inhibiting MPC-1 were anti-inflammatory and neuroprotective in the AD model, revealing that HER-2, MPC-1, and ERR-α may be promising therapeutic targets for AD.
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Affiliation(s)
- Heba M Mansour
- Department of Pharmacology, Egyptian Drug Authority, EDA, formerly NODCAR, Giza, Egypt.
| | - Hala M Fawzy
- Department of Pharmacology, Egyptian Drug Authority, EDA, formerly NODCAR, Giza, Egypt
| | - Aiman S El-Khatib
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Mahmoud M Khattab
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Cairo University, Cairo, Egypt
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21
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Ding Y, Li G, Zhou Z, Deng T. Molecular mechanisms underlying hepatitis C virus infection-related diabetes. Metabolism 2021; 121:154802. [PMID: 34090869 DOI: 10.1016/j.metabol.2021.154802] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 05/27/2021] [Accepted: 05/31/2021] [Indexed: 12/16/2022]
Abstract
Diabetes is a noncommunicable widespread disease that poses the risk of severe complications in patients, with certain complications being life-threatening. Hepatitis C is an infectious disease that mainly causes liver damage, which is also a profound threat to human health. Hepatitis C virus (HCV) infection has many extrahepatic manifestations, including diabetes. Multiple mechanisms facilitate the strong association between HCV and diabetes. HCV infection can affect the insulin signaling pathway in liver and pancreatic tissue and change the profiles of circulating microRNAs, which may further influence the occurrence and development of diabetes. This review describes how HCV infection causes diabetes and discusses the current research progress with respect to HCV infection-related diabetes.
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Affiliation(s)
- Yujin Ding
- National Clinical Research Center for Metabolic Diseases, and Department of Metabolism and Endocrinology, The Second Xiangya Hospital of Central South University, 139 Middle Renmin Road, Changsha, 410011, Hunan, China; Key Laboratory of Diabetes Immunology, Ministry of Education, and Metabolic Syndrome Research Center, The Second Xiangya Hospital of Central South University, 139 Middle Renmin Road, Changsha, 410011, Hunan, China
| | - Guangdi Li
- Hunan Provincial Key Laboratory of Clinical Epidemiology, Xiangya School of Public Health, Central South University, Changsha 410011, Hunan, China
| | - Zhiguang Zhou
- National Clinical Research Center for Metabolic Diseases, and Department of Metabolism and Endocrinology, The Second Xiangya Hospital of Central South University, 139 Middle Renmin Road, Changsha, 410011, Hunan, China; Key Laboratory of Diabetes Immunology, Ministry of Education, and Metabolic Syndrome Research Center, The Second Xiangya Hospital of Central South University, 139 Middle Renmin Road, Changsha, 410011, Hunan, China
| | - Tuo Deng
- National Clinical Research Center for Metabolic Diseases, and Department of Metabolism and Endocrinology, The Second Xiangya Hospital of Central South University, 139 Middle Renmin Road, Changsha, 410011, Hunan, China; Key Laboratory of Diabetes Immunology, Ministry of Education, and Metabolic Syndrome Research Center, The Second Xiangya Hospital of Central South University, 139 Middle Renmin Road, Changsha, 410011, Hunan, China; Clinical Immunology Center, The Second Xiangya Hospital of Central South University, Changsha 410011, Hunan, China.
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22
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de la Calle Arregui C, Plata-Gómez AB, Deleyto-Seldas N, García F, Ortega-Molina A, Abril-Garrido J, Rodriguez E, Nemazanyy I, Tribouillard L, de Martino A, Caleiras E, Campos-Olivas R, Mulero F, Laplante M, Muñoz J, Pende M, Sabio G, Sabatini DM, Efeyan A. Limited survival and impaired hepatic fasting metabolism in mice with constitutive Rag GTPase signaling. Nat Commun 2021; 12:3660. [PMID: 34135321 PMCID: PMC8209044 DOI: 10.1038/s41467-021-23857-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 05/17/2021] [Indexed: 12/16/2022] Open
Abstract
The mechanistic target of rapamycin complex 1 (mTORC1) integrates cellular nutrient signaling and hormonal cues to control metabolism. We have previously shown that constitutive nutrient signaling to mTORC1 by means of genetic activation of RagA (expression of GTP-locked RagA, or RagAGTP) in mice resulted in a fatal energetic crisis at birth. Herein, we rescue neonatal lethality in RagAGTP mice and find morphometric and metabolic alterations that span glucose, lipid, ketone, bile acid and amino acid homeostasis in adults, and a median lifespan of nine months. Proteomic and metabolomic analyses of livers from RagAGTP mice reveal a failed metabolic adaptation to fasting due to a global impairment in PPARα transcriptional program. These metabolic defects are partially recapitulated by restricting activation of RagA to hepatocytes, and revert by pharmacological inhibition of mTORC1. Constitutive hepatic nutrient signaling does not cause hepatocellular damage and carcinomas, unlike genetic activation of growth factor signaling upstream of mTORC1. In summary, RagA signaling dictates dynamic responses to feeding-fasting cycles to tune metabolism so as to match the nutritional state.
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Affiliation(s)
- Celia de la Calle Arregui
- Metabolism and Cell Signaling Laboratory, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Ana Belén Plata-Gómez
- Metabolism and Cell Signaling Laboratory, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Nerea Deleyto-Seldas
- Metabolism and Cell Signaling Laboratory, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Fernando García
- Proteomics Unit, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Ana Ortega-Molina
- Metabolism and Cell Signaling Laboratory, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Julio Abril-Garrido
- Metabolism and Cell Signaling Laboratory, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Elena Rodriguez
- Myocardial Pathophysiology, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
| | - Ivan Nemazanyy
- Platform for Metabolic Analyses, Structure Fédérative de Recherche Necker, INSERM US24/CNRS UMS 3633, Paris, France
| | - Laura Tribouillard
- Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec (CRIUCPQ), Faculté de Médecine, Université Laval, Québec, QC, Canada
- Centre de recherche sur le cancer de l'Université Laval, Université Laval, Québec, QC, Canada
| | - Alba de Martino
- Histopathology Unit. Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Eduardo Caleiras
- Histopathology Unit. Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Ramón Campos-Olivas
- Spectroscopy and NMR Unit, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Francisca Mulero
- Molecular Imaging Unit, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Mathieu Laplante
- Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec (CRIUCPQ), Faculté de Médecine, Université Laval, Québec, QC, Canada
- Centre de recherche sur le cancer de l'Université Laval, Université Laval, Québec, QC, Canada
| | - Javier Muñoz
- Proteomics Unit, Spanish National Cancer Research Centre (CNIO), Madrid, Spain
| | - Mario Pende
- Institut Necker Enfants Malades, INSERM U1151, Université de Paris, Paris, France
| | - Guadalupe Sabio
- Myocardial Pathophysiology, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
| | - David M Sabatini
- Whitehead Institute for Biomedical Research, Nine Cambridge Center, Cambridge, MA, USA
- Department of Biology, Massachusetts Institute of Technology (MIT), Cambridge, MA, USA
- David H. Koch Institute for Integrative Cancer Research at MIT, Cambridge, MA, USA
- Broad Institute, Seven Cambridge Center, Cambridge, MA, USA
- Howard Hughes Medical Institute, MIT, Cambridge, MA, USA
| | - Alejo Efeyan
- Metabolism and Cell Signaling Laboratory, Spanish National Cancer Research Centre (CNIO), Madrid, Spain.
- Whitehead Institute for Biomedical Research, Nine Cambridge Center, Cambridge, MA, USA.
- Department of Biology, Massachusetts Institute of Technology (MIT), Cambridge, MA, USA.
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23
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Kuramoto K, Kim YJ, Hong JH, He C. The autophagy protein Becn1 improves insulin sensitivity by promoting adiponectin secretion via exocyst binding. Cell Rep 2021; 35:109184. [PMID: 34038729 PMCID: PMC8177967 DOI: 10.1016/j.celrep.2021.109184] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 03/16/2021] [Accepted: 05/05/2021] [Indexed: 12/14/2022] Open
Abstract
Autophagy dysregulation is implicated in metabolic diseases, including type 2 diabetes. However, the mechanism by which the autophagy machinery regulates metabolism is largely unknown. Autophagy is generally considered a degradation process via lysosomes. Here, we unveil a metabolically important non-cell-autonomous, non-degradative mechanism regulated by the essential autophagy protein Becn1 in adipose tissue. Upon high-fat diet challenge, autophagy-hyperactive Becn1F121A mice show systemically improved insulin sensitivity and enhanced activation of AMP-activated protein kinase (AMPK), a central regulator of energy homeostasis, via a non-cell-autonomous mechanism mediated by adiponectin, an adipose-derived metabolic hormone. Adipose-specific Becn1F121A expression is sufficient to activate AMPK in non-adipose tissues and improve systemic insulin sensitivity by increasing adiponectin secretion. Further, Becn1 enhances adiponectin secretion by interacting with components of the exocyst complex via the coiled-coil domain. Together, our study demonstrates that Becn1 improves insulin sensitivity by facilitating adiponectin secretion through binding the exocyst in adipose tissue.
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Affiliation(s)
- Kenta Kuramoto
- Department of Cell and Developmental Biology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Yoon-Jin Kim
- Department of Cell and Developmental Biology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Jung Hwa Hong
- Department of Cell and Developmental Biology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Congcong He
- Department of Cell and Developmental Biology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.
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Littlejohn EL, DeSana AJ, Williams HC, Chapman RT, Joseph B, Juras JA, Saatman KE. IGF1-Stimulated Posttraumatic Hippocampal Remodeling Is Not Dependent on mTOR. Front Cell Dev Biol 2021; 9:663456. [PMID: 34095131 PMCID: PMC8174097 DOI: 10.3389/fcell.2021.663456] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 04/26/2021] [Indexed: 01/29/2023] Open
Abstract
Adult hippocampal neurogenesis is stimulated acutely following traumatic brain injury (TBI). However, many hippocampal neurons born after injury develop abnormally and the number that survive long-term is debated. In experimental TBI, insulin-like growth factor-1 (IGF1) promotes hippocampal neuronal differentiation, improves immature neuron dendritic arbor morphology, increases long-term survival of neurons born after TBI, and improves cognitive function. One potential downstream mediator of the neurogenic effects of IGF1 is mammalian target of rapamycin (mTOR), which regulates proliferation as well as axonal and dendritic growth in the CNS. Excessive mTOR activation is posited to contribute to aberrant plasticity related to posttraumatic epilepsy, spurring preclinical studies of mTOR inhibitors as therapeutics for TBI. The degree to which pro-neurogenic effects of IGF1 depend upon upregulation of mTOR activity is currently unknown. Using immunostaining for phosphorylated ribosomal protein S6, a commonly used surrogate for mTOR activation, we show that controlled cortical impact TBI triggers mTOR activation in the dentate gyrus in a time-, region-, and injury severity-dependent manner. Posttraumatic mTOR activation in the granule cell layer (GCL) and dentate hilus was amplified in mice with conditional overexpression of IGF1. In contrast, delayed astrocytic activation of mTOR signaling within the dentate gyrus molecular layer, closely associated with proliferation, was not affected by IGF1 overexpression. To determine whether mTOR activation is necessary for IGF1-mediated stimulation of posttraumatic hippocampal neurogenesis, wildtype and IGF1 transgenic mice received the mTOR inhibitor rapamycin daily beginning at 3 days after TBI, following pulse labeling with bromodeoxyuridine. Compared to wildtype mice, IGF1 overexpressing mice exhibited increased posttraumatic neurogenesis, with a higher density of posttrauma-born GCL neurons at 10 days after injury. Inhibition of mTOR did not abrogate IGF1-stimulated enhancement of posttraumatic neurogenesis. Rather, rapamycin treatment in IGF1 transgenic mice, but not in WT mice, increased numbers of cells labeled with BrdU at 3 days after injury that survived to 10 days, and enhanced the proportion of posttrauma-born cells that differentiated into neurons. Because beneficial effects of IGF1 on hippocampal neurogenesis were maintained or even enhanced with delayed inhibition of mTOR, combination therapy approaches may hold promise for TBI.
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Affiliation(s)
| | | | | | | | | | | | - Kathryn E. Saatman
- Department of Physiology, Spinal Cord and Brain Injury Research Center, University of Kentucky, Lexington, KY, United States
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Wright SCE, Vasilevski N, Serra V, Rodon J, Eichhorn PJA. Mechanisms of Resistance to PI3K Inhibitors in Cancer: Adaptive Responses, Drug Tolerance and Cellular Plasticity. Cancers (Basel) 2021; 13:cancers13071538. [PMID: 33810522 PMCID: PMC8037590 DOI: 10.3390/cancers13071538] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 03/11/2021] [Accepted: 03/15/2021] [Indexed: 12/24/2022] Open
Abstract
The phosphatidylinositol-3-kinase (PI3K) pathway plays a central role in the regulation of several signalling cascades which regulate biological processes such as cellular growth, survival, proliferation, motility and angiogenesis. The hyperactivation of this pathway is linked to tumour progression and is one of the most common events in human cancers. Additionally, aberrant activation of the PI3K pathway has been demonstrated to limit the effectiveness of a number of anti-tumour agents paving the way for the development and implementation of PI3K inhibitors in the clinic. However, the overall effectiveness of these compounds has been greatly limited by inadequate target engagement due to reactivation of the pathway by compensatory mechanisms. Herein, we review the common adaptive responses that lead to reactivation of the PI3K pathway, therapy resistance and potential strategies to overcome these mechanisms of resistance. Furthermore, we highlight the potential role in changes in cellular plasticity and PI3K inhibitor resistance.
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Affiliation(s)
- Sarah Christine Elisabeth Wright
- Faculty of Health Sciences, Curtin Medical School, Curtin University, Bentley 6102, Australia;
- Curtin Health Innovation Research Institute and Faculty of Health Sciences, Curtin University, Bentley 6102, Australia
- Correspondence: (S.C.E.W.); (N.V.)
| | - Natali Vasilevski
- Faculty of Health Sciences, Curtin Medical School, Curtin University, Bentley 6102, Australia;
- Curtin Health Innovation Research Institute and Faculty of Health Sciences, Curtin University, Bentley 6102, Australia
- Correspondence: (S.C.E.W.); (N.V.)
| | - Violeta Serra
- Vall d’Hebron Institute of Oncology (VHIO), Vall d’Hebron University Hospital, 08035 Barcelona, Spain;
| | - Jordi Rodon
- MD Anderson Cancer Center, Investigational Cancer Therapeutics Department, Houston, TX 77030, USA;
| | - Pieter Johan Adam Eichhorn
- Faculty of Health Sciences, Curtin Medical School, Curtin University, Bentley 6102, Australia;
- Curtin Health Innovation Research Institute and Faculty of Health Sciences, Curtin University, Bentley 6102, Australia
- Cancer Science Institute of Singapore, National University of Singapore, Singapore 117599, Singapore
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore
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26
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Ren Y, Sivaganesan S, Clark NA, Zhang L, Biesiada J, Niu W, Plas DR, Medvedovic M. Predicting mechanism of action of cellular perturbations with pathway activity signatures. Bioinformatics 2021; 36:4781-4788. [PMID: 32653926 DOI: 10.1093/bioinformatics/btaa590] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 06/15/2020] [Accepted: 07/03/2020] [Indexed: 12/16/2022] Open
Abstract
MOTIVATION Misregulation of signaling pathway activity is etiologic for many human diseases, and modulating activity of signaling pathways is often the preferred therapeutic strategy. Understanding the mechanism of action (MOA) of bioactive chemicals in terms of targeted signaling pathways is the essential first step in evaluating their therapeutic potential. Changes in signaling pathway activity are often not reflected in changes in expression of pathway genes which makes MOA inferences from transcriptional signatures (TSeses) a difficult problem. RESULTS We developed a new computational method for implicating pathway targets of bioactive chemicals and other cellular perturbations by integrated analysis of pathway network topology, the Library of Integrated Network-based Cellular Signature TSes of genetic perturbations of pathway genes and the TS of the perturbation. Our methodology accurately predicts signaling pathways targeted by the perturbation when current pathway analysis approaches utilizing only the TS of the perturbation fail. AVAILABILITY AND IMPLEMENTATION Open source R package paslincs is available at https://github.com/uc-bd2k/paslincs. SUPPLEMENTARY INFORMATION Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- Yan Ren
- Division of Biostatistics and Bioinformatics, Department of Environmental Health, University of Cincinnati, Cincinnati, OH 45267-0056, USA
| | - Siva Sivaganesan
- Department of Mathematical Sciences, University of Cincinnati, Cincinnati, OH 45221-0025, USA
| | - Nicholas A Clark
- Division of Biostatistics and Bioinformatics, Department of Environmental Health, University of Cincinnati, Cincinnati, OH 45267-0056, USA
| | - Lixia Zhang
- Division of Biostatistics and Bioinformatics, Department of Environmental Health, University of Cincinnati, Cincinnati, OH 45267-0056, USA
| | - Jacek Biesiada
- Division of Biostatistics and Bioinformatics, Department of Environmental Health, University of Cincinnati, Cincinnati, OH 45267-0056, USA
| | - Wen Niu
- Division of Biostatistics and Bioinformatics, Department of Environmental Health, University of Cincinnati, Cincinnati, OH 45267-0056, USA
| | - David R Plas
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA
| | - Mario Medvedovic
- Division of Biostatistics and Bioinformatics, Department of Environmental Health, University of Cincinnati, Cincinnati, OH 45267-0056, USA
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Di Pietrantonio N, Palmerini C, Pipino C, Baldassarre MPA, Bologna G, Mohn A, Giannini C, Lanuti P, Chiarelli F, Pandolfi A, Di Pietro N. Plasma from obese children increases monocyte-endothelial adhesion and affects intracellular insulin signaling in cultured endothelial cells: Potential role of mTORC1-S6K1. Biochim Biophys Acta Mol Basis Dis 2021; 1867:166076. [PMID: 33422633 DOI: 10.1016/j.bbadis.2021.166076] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 12/27/2020] [Accepted: 01/04/2021] [Indexed: 12/16/2022]
Abstract
Childhood obesity is characterized by the loss of vascular insulin sensitivity along with altered oxidant-antioxidant state and chronic inflammation, which play a key role in the onset of endothelial dysfunction. We previously demonstrated a reduced insulin-stimulated Nitric Oxide (NO) bioavailability in Human Umbilical Vein Endothelial cells (HUVECs) cultured with plasma from obese pre-pubertal children (OB) compared to those cultured with plasma of normal-weight children (CTRL). However, mechanisms underlying endothelial dysfunction in childhood obesity remains poorly understood. Hence, the present study aimed to better investigate these mechanisms, also considering a potential involvement of mammalian Target Of Rapamycin Complex1 (mTORC1)-ribosomal protein S6 Kinase beta1 (S6K1) pathway. OB-children (N = 32, age: 9.2 ± 1.7; BMI z-score: 2.72 ± 0.31) had higher fasting insulin levels and increased HOMA-IR than CTRL-children (N = 32, age: 8.8 ± 1.2; BMI z-score: 0.33 ± 0.75). In vitro, HUVECs exposed to OB-plasma exhibited significant increase in Reactive Oxygen Species (ROS) levels, higher vascular and intercellular adhesion molecules exposure, together with increased monocytes-endothelial interaction. This was associated with unbalanced pro- and anti-atherogenic endothelial insulin stimulated signaling pathways, as measured by increased Mitogen Activated Protein Kinase (MAPK) and decreased Insulin Receptor Substrate-1 (IRS-1)/protein kinase B (Akt)/ endothelial NO Synthase (eNOS) phosphorylation levels, together with augmented S6K1 activation. Interestingly, inhibition of mTORC1-S6K1 pathway using rapamycin significantly restored the IRS-1/Akt/eNOS activation, suggesting a feedback regulation of IRS-1/Akt signal through S6K1. Overall, our in vitro data shed light on new mechanisms underlying the onset of endothelial dysfunction in childhood obesity.
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Affiliation(s)
- Nadia Di Pietrantonio
- Department of Medical, Oral and Biotechnological Sciences, Italy; Center for Advanced Studies and Technology - CAST (ex CeSI-MeT), University G. d'Annunzio of Chieti-Pescara, Italy
| | - Carola Palmerini
- Department of Medical, Oral and Biotechnological Sciences, Italy; Center for Advanced Studies and Technology - CAST (ex CeSI-MeT), University G. d'Annunzio of Chieti-Pescara, Italy
| | - Caterina Pipino
- Department of Medical, Oral and Biotechnological Sciences, Italy; Center for Advanced Studies and Technology - CAST (ex CeSI-MeT), University G. d'Annunzio of Chieti-Pescara, Italy
| | - Maria Pompea Antonia Baldassarre
- Department of Medicine and Aging Sciences, Italy; Center for Advanced Studies and Technology - CAST (ex CeSI-MeT), University G. d'Annunzio of Chieti-Pescara, Italy
| | - Giuseppina Bologna
- Department of Medicine and Aging Sciences, Italy; Center for Advanced Studies and Technology - CAST (ex CeSI-MeT), University G. d'Annunzio of Chieti-Pescara, Italy
| | - Angelika Mohn
- Pediatrics Division, Hospital SS. Annunziata, Chieti, Italy
| | - Cosimo Giannini
- Department of Medicine and Aging Sciences, Italy; Pediatrics Division, Hospital SS. Annunziata, Chieti, Italy
| | - Paola Lanuti
- Department of Medicine and Aging Sciences, Italy; Center for Advanced Studies and Technology - CAST (ex CeSI-MeT), University G. d'Annunzio of Chieti-Pescara, Italy
| | - Francesco Chiarelli
- Department of Medicine and Aging Sciences, Italy; Pediatrics Division, Hospital SS. Annunziata, Chieti, Italy
| | - Assunta Pandolfi
- Department of Medical, Oral and Biotechnological Sciences, Italy; Center for Advanced Studies and Technology - CAST (ex CeSI-MeT), University G. d'Annunzio of Chieti-Pescara, Italy
| | - Natalia Di Pietro
- Department of Medical, Oral and Biotechnological Sciences, Italy; Center for Advanced Studies and Technology - CAST (ex CeSI-MeT), University G. d'Annunzio of Chieti-Pescara, Italy.
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28
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Unraveling the multifaceted nature of the nuclear function of mTOR. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2020; 1868:118907. [PMID: 33189783 DOI: 10.1016/j.bbamcr.2020.118907] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 11/02/2020] [Accepted: 11/08/2020] [Indexed: 01/25/2023]
Abstract
Positioned at the axis between the cell and its environment, mTOR directs a wide range of cellular activity in response to nutrients, growth factors, and stress. Our understanding of the role of mTOR is evolving beyond the spatial confines of the cytosol, and its role in the nucleus becoming ever more apparent. In this review, we will address various studies that explore the role of nuclear mTOR (nmTOR) in specific cellular programs and how these pathways influence one another. To understand the emerging roles of nuclear mTOR, we discuss data and propose plausible mechanisms to offer novel ideas, hypotheses, and future research directions.
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Perez RE, Calhoun S, Shim D, Levenson VV, Duan L, Maki CG. Prolyl endopeptidase inhibitor Y-29794 blocks the IRS1-AKT-mTORC1 pathway and inhibits survival and in vivo tumor growth of triple-negative breast cancer. Cancer Biol Ther 2020; 21:1033-1040. [PMID: 33044914 PMCID: PMC7678932 DOI: 10.1080/15384047.2020.1824989] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 08/25/2020] [Accepted: 09/10/2020] [Indexed: 10/23/2022] Open
Abstract
Prolyl endopeptidase (PREP), also known as prolyl oligopeptidase (POP), is an enzyme that cleaves short peptides (<30 amino acids in length) on the C-terminal side of proline. PREP is highly expressed in multiple carcinomas and is a potential target for cancer therapy. A potent inhibitor of PREP, Y-29794, causes long-lasting inhibition of PREP in mouse tissues. However, there are no reports on Y-29794 effects on cancer cell and tumor proliferation. Using cell line models of aggressive triple-negative breast cancer (TNBC), we show here that Y-29794 inhibited proliferation and induced death in multiple TNBC cell lines. Cell death induced by Y-29794 coincided with inhibition of the IRS1-AKT-mTORC1 survival signaling pathway, although stable depletion of PREP alone was not sufficient to reduce IRS1-AKT-mTORC1 signaling or induce death. These results suggest that Y-29794 elicits its cancer cell killing effect by targeting other mechanisms in addition to PREP. Importantly, Y-29794 inhibited tumor growth when tested in xenograft models of TNBC in mice. Induction of cell death in culture and inhibition of xenograft tumor growth support the potential utility of Y-29794 or its derivatives as a treatment option for TNBC tumors.
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Affiliation(s)
- Ricardo E Perez
- Department of Cell and Molecular Medicine, Rush University Medical Center, Chicago, IL, USA
| | - Sarah Calhoun
- Department of Cell and Molecular Medicine, Rush University Medical Center, Chicago, IL, USA
| | - Daeun Shim
- Department of Cell and Molecular Medicine, Rush University Medical Center, Chicago, IL, USA
| | - Victor V. Levenson
- Department of Cell and Molecular Medicine, Rush University Medical Center, Chicago, IL, USA
| | - Lei Duan
- Department of Cell and Molecular Medicine, Rush University Medical Center, Chicago, IL, USA
| | - Carl G. Maki
- Department of Cell and Molecular Medicine, Rush University Medical Center, Chicago, IL, USA
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30
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Chen Y, Huang L, Dong Y, Tao C, Zhang R, Shao H, Shen H. Effect of AKT1 (p. E17K) Hotspot Mutation on Malignant Tumorigenesis and Prognosis. Front Cell Dev Biol 2020; 8:573599. [PMID: 33123537 PMCID: PMC7573235 DOI: 10.3389/fcell.2020.573599] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 09/03/2020] [Indexed: 12/12/2022] Open
Abstract
The substitution of the seventeenth amino acid glutamate by lysine in the homologous structural domain of the Akt1 gene pleckstrin is a somatic cellular mutation found in breast, colorectal, and ovarian cancers, named p. Glu17Lys or E17K. In recent years, a growing number of studies have suggested that this mutation may play a unique role in the development of tumors. In this review article, we describe how AKT1(E17K) mutations stimulate downstream signals that cause cells to emerge transformed; we explore the differential regulation and function of E17K in different physiological and pathological settings; and we also describe the phenomenon that E17K impedes tumor growth by interfering with growth-promoting and chemotherapy-resistant AKT1lowQCC generation, an intriguing finding that mutants may prolong tumor patient survival by activating feedback mechanisms and disrupting transcription. This review is intended to provide a better understanding of the role of AKT1(E17K) in cancer and to inform the development of AKT1(E17K)-based antitumor strategies.
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Affiliation(s)
- Ying Chen
- Guangdong Province Key Laboratory for Biotechnology Drug Candidates, School of Life Sciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, China
| | - Lan Huang
- Guangdong Province Key Laboratory for Biotechnology Drug Candidates, School of Life Sciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, China
| | - Yongjian Dong
- Guangdong Province Key Laboratory for Biotechnology Drug Candidates, School of Life Sciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, China
| | - Changli Tao
- Guangdong Province Key Laboratory for Biotechnology Drug Candidates, School of Life Sciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, China
| | - Rongxin Zhang
- Guangdong Province Key Laboratory for Biotechnology Drug Candidates, School of Life Sciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, China
| | - Hongwei Shao
- Guangdong Province Key Laboratory for Biotechnology Drug Candidates, School of Life Sciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, China
| | - Han Shen
- Guangdong Province Key Laboratory for Biotechnology Drug Candidates, School of Life Sciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, China
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31
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Chen Y, Zhou X. Research progress of mTOR inhibitors. Eur J Med Chem 2020; 208:112820. [PMID: 32966896 DOI: 10.1016/j.ejmech.2020.112820] [Citation(s) in RCA: 106] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 08/16/2020] [Accepted: 09/03/2020] [Indexed: 12/25/2022]
Abstract
Mammalian target of rapamycin (mTOR) is a highly conserved Serine/Threonine (Ser/Thr) protein kinase, which belongs to phosphatidylinositol-3-kinase-related kinase (PIKK) protein family. mTOR exists as two types of protein complex: mTORC1 and mTORC2, which act as central controller regulating processes of cell metabolism, growth, proliferation, survival and autophagy. The mTOR inhibitors block mTOR signaling pathway, producing anti-inflammatory, anti-proliferative, autophagy and apoptosis induction effects, thus mTOR inhibitors are mainly used in cancer therapy. At present, mTOR inhibitors are divided into four categories: Antibiotic allosteric mTOR inhibitors (first generation), ATP-competitive mTOR inhibitors (second generation), mTOR/PI3K dual inhibitors (second generation) and other new mTOR inhibitors (third generation). In this article, these four categories of mTOR inhibitors and their structures, properties and some clinical researches will be introduced. Among them, we focus on the structure of mTOR inhibitors and try to analyze the structure-activity relationship. mTOR inhibitors are classified according to their chemical structure and their contents are introduced systematically. Moreover, some natural products that have direct or indirect mTOR inhibitory activities are introduced together. In this article, we analyzed the target, binding mode and structure-activity relationship of each generation of mTOR inhibitors and proposed two hypothetic scaffolds (the inverted-Y-shape scaffold and the C-shape scaffold) for the second generation of mTOR inhibitors. These findings may provide some help or reference for drug designing, drug modification or the future development of mTOR inhibitor.
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Affiliation(s)
- Yifan Chen
- School of Pharmaceutical Sciences, Jilin University, Changchun, 130021, China
| | - Xiaoping Zhou
- School of Pharmaceutical Sciences, Jilin University, Changchun, 130021, China.
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32
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Castets P, Ham DJ, Rüegg MA. The TOR Pathway at the Neuromuscular Junction: More Than a Metabolic Player? Front Mol Neurosci 2020; 13:162. [PMID: 32982690 PMCID: PMC7485269 DOI: 10.3389/fnmol.2020.00162] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Accepted: 08/05/2020] [Indexed: 12/18/2022] Open
Abstract
The neuromuscular junction (NMJ) is the chemical synapse connecting motor neurons and skeletal muscle fibers. NMJs allow all voluntary movements, and ensure vital functions like breathing. Changes in the structure and function of NMJs are hallmarks of numerous pathological conditions that affect muscle function including sarcopenia, the age-related loss of muscle mass and function. However, the molecular mechanisms leading to the morphological and functional perturbations in the pre- and post-synaptic compartments of the NMJ remain poorly understood. Here, we discuss the role of the metabolic pathway associated to the kinase TOR (Target of Rapamycin) in the development, maintenance and alterations of the NMJ. This is of particular interest as the TOR pathway has been implicated in aging, but its role at the NMJ is still ill-defined. We highlight the respective functions of the two TOR-associated complexes, TORC1 and TORC2, and discuss the role of localized protein synthesis and autophagy regulation in motor neuron terminals and sub-synaptic regions of muscle fibers and their possible effects on NMJ maintenance.
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Affiliation(s)
- Perrine Castets
- Department of Cell Physiology and Metabolism, Faculty of Medicine, University of Geneva, Geneva, Switzerland
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33
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Ancu O, Mickute M, Guess ND, Hurren NM, Burd NA, Mackenzie RW. Does high dietary protein intake contribute to the increased risk of developing prediabetes and type 2 diabetes? Appl Physiol Nutr Metab 2020; 46:1-9. [PMID: 32755490 DOI: 10.1139/apnm-2020-0396] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Insulin resistance is a complex metabolic disorder implicated in the development of many chronic diseases. While it is generally accepted that body mass loss should be the primary approach for the management of insulin resistance-related disorders in overweight and obese individuals, there is no consensus among researchers regarding optimal protein intake during dietary restriction. Recently, it has been suggested that increased plasma branched-chain amino acids concentrations are associated with the development of insulin resistance and type 2 diabetes. The exact mechanism by which excessive amino acid availability may contribute to insulin resistance has not been fully investigated. However, it has been hypothesised that mammalian target of rapamycin (mTOR) complex 1 hyperactivation in the presence of amino acid overload contributes to reduced insulin-stimulated glucose uptake because of insulin receptor substrate (IRS) degradation and reduced Akt-AS160 activity. In addition, the long-term effects of high-protein diets on insulin sensitivity during both weight-stable and weight-loss conditions require more research. This review focusses on the effects of high-protein diets on insulin sensitivity and discusses the potential mechanisms by which dietary amino acids can affect insulin signalling. Novelty: Excess amino acids may over-activate mTOR, resulting in desensitisation of IRS-1 and reduced insulin-mediated glucose uptake.
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Affiliation(s)
- Oana Ancu
- Department of Life Sciences, University of Roehampton, London SW15 4DJ, UK
| | - Monika Mickute
- Diabetes Research Centre, University of Leicester and the NIHR Leicester Biomedical Research Centre, Leicester, LE17RH, UK
| | - Nicola D Guess
- Department of Nutritional Sciences, King's College London, London, WC2R2LS, UK
| | - Nicholas M Hurren
- Department of Life Sciences, University of Roehampton, London SW15 4DJ, UK
| | - Nicholas A Burd
- Division of Nutritional Sciences, University of Illinois, Urbana, IL 61820, USA
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34
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Lantier L, Williams AS, Williams IM, Guerin A, Bracy DP, Goelzer M, Foretz M, Viollet B, Hughey CC, Wasserman DH. Reciprocity Between Skeletal Muscle AMPK Deletion and Insulin Action in Diet-Induced Obese Mice. Diabetes 2020; 69:1636-1649. [PMID: 32439824 PMCID: PMC7372072 DOI: 10.2337/db19-1074] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 05/19/2020] [Indexed: 11/13/2022]
Abstract
Insulin resistance due to overnutrition places a burden on energy-producing pathways in skeletal muscle (SkM). Nevertheless, energy state is not compromised. The hypothesis that the energy sensor AMPK is necessary to offset the metabolic burden of overnutrition was tested using chow-fed and high-fat (HF)-fed SkM-specific AMPKα1α2 knockout (mdKO) mice and AMPKα1α2lox/lox littermates (wild-type [WT]). Lean mdKO and WT mice were phenotypically similar. HF-fed mice were equally obese and maintained lean mass regardless of genotype. Results did not support the hypothesis that AMPK is protective during overnutrition. Paradoxically, mdKO mice were more insulin sensitive. Insulin-stimulated SkM glucose uptake was approximately twofold greater in mdKO mice in vivo. Furthermore, insulin signaling, SkM GLUT4 translocation, hexokinase activity, and glycolysis were increased. AMPK and insulin signaling intersect at mammalian target of rapamycin (mTOR), a critical node for cell proliferation and survival. Basal mTOR activation was reduced by 50% in HF-fed mdKO mice, but was normalized by insulin stimulation. Mitochondrial function was impaired in mdKO mice, but energy charge was preserved by AMP deamination. Results show a surprising reciprocity between SkM AMPK signaling and insulin action that manifests with diet-induced obesity, as insulin action is preserved to protect fundamental energetic processes in the muscle.
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Affiliation(s)
- Louise Lantier
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN
- Vanderbilt Mouse Metabolic Phenotyping Center, Nashville, TN
| | - Ashley S Williams
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN
| | - Ian M Williams
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN
| | - Amanda Guerin
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN
| | - Deanna P Bracy
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN
| | - Mickael Goelzer
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN
| | - Marc Foretz
- Université de Paris, Institut Cochin, CNRS, INSERM, Paris, France
| | - Benoit Viollet
- Université de Paris, Institut Cochin, CNRS, INSERM, Paris, France
| | - Curtis C Hughey
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN
| | - David H Wasserman
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN
- Vanderbilt Mouse Metabolic Phenotyping Center, Nashville, TN
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35
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Li W, Zhao L, Wang J. Searching for the Mechanisms of Mammalian Cellular Aging Through Underlying Gene Regulatory Networks. Front Genet 2020; 11:593. [PMID: 32714367 PMCID: PMC7340167 DOI: 10.3389/fgene.2020.00593] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Accepted: 05/15/2020] [Indexed: 01/16/2023] Open
Abstract
Aging attracts the attention throughout the history of humankind. However, it is still challenging to understand how the internal driving forces, for example, the fundamental building blocks of life, such as genes and proteins, as well as the environments work together to determine longevity in mammals. In this study, we built a gene regulatory network for mammalian cellular aging based on the experimental literature and quantify its underlying driving force for the dynamics as potential and flux landscape. We found three steady-state attractors: a fast-aging state attractor, slow-aging state attractor, and intermediate state attractor. The system can switch from one state attractor to another driven by the intrinsic or external forces through the genetics and the environment. We identified the dominant path from the slow-aging state directly to the fast-aging state. We also identified the dominant path from slow-aging to fast-aging through an intermediate state. We quantified the evolving landscape for revealing the dynamic characteristics of aging through certain regulation changes in time. We also predicted the key genes and regulations for fast-aging and slow-aging through the analysis of the stability for landscape basins. We also found the oscillation dynamics between fast-aging and slow-aging and showed that more energy is required to sustain such oscillations. We found that the flux is the dynamic cause and the entropy production rate the thermodynamic origin of the phase transitions or the bifurcations between the three-state phase and oscillation phase. The landscape quantification provides a global and physical approach to explore the underlying mechanisms of cellular aging in mammals.
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Affiliation(s)
- Wenbo Li
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
| | - Lei Zhao
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
| | - Jin Wang
- Department of Chemistry and Physics, State University of New York at Stony Brook, Stony Brook, NY, United States
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Amin HM, Morani AC, Daw NC, Lamhamedi-Cherradi SE, Subbiah V, Menegaz BA, Vishwamitra D, Eskandari G, George B, Benjamin RS, Patel S, Song J, Lazar AJ, Wang WL, Kurzrock R, Pappo A, Anderson PM, Schwartz GK, Araujo D, Cuglievan B, Ratan R, McCall D, Mohiuddin S, Livingston JA, Molina ER, Naing A, Ludwig JA. IGF-1R/mTOR Targeted Therapy for Ewing Sarcoma: A Meta-Analysis of Five IGF-1R-Related Trials Matched to Proteomic and Radiologic Predictive Biomarkers. Cancers (Basel) 2020; 12:cancers12071768. [PMID: 32630797 PMCID: PMC7408058 DOI: 10.3390/cancers12071768] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 06/26/2020] [Accepted: 06/29/2020] [Indexed: 12/29/2022] Open
Abstract
Background : Ten to fourteen percent of Ewing sarcoma (ES) study participants treated nationwide with IGF-1 receptor (IGF-1R)-targeted antibodies achieved tumor regression. Despite this success, low response rates and short response durations (approximately 7-weeks) have slowed the development of this therapy. Methods: We performed a meta-analysis of five phase-1b/2 ES-oriented trials that evaluated the anticancer activity of IGF-1R antibodies +/− mTOR inhibitors (mTORi). Our meta-analysis provided a head-to-head comparison of the clinical benefits of IGF-1R antibodies vs. the IGF-1R/mTOR-targeted combination. Available pretreatment clinical samples were semi-quantitatively scored using immunohistochemistry to detect proteins in the IGF-1R/PI3K/AKT/mTOR pathway linked to clinical response. Early PET/CT imaging, obtained within the first 2 weeks (median 10 days), were examined to determine if reduced FDG avidity was predictive of progression-free survival (PFS). Results: Among 56 ES patients treated at MD Anderson Cancer Center (MDACC) with IGF-1R antibodies, our analysis revealed a significant ~two-fold improvement in PFS that favored a combination of IGF-1R/mTORi therapy (1.6 vs. 3.3-months, p = 0.042). Low pIGF-1R in the pretreatment specimens was associated with treatment response. Reduced total-lesion glycolysis more accurately predicted the IGF-1R response than other previously reported radiological biomarkers. Conclusion: Synergistic drug combinations, and newly identified proteomic or radiological biomarkers of IGF-1R response, may be incorporated into future IGF-1R-related trials to improve the response rate in ES patients.
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Affiliation(s)
- Hesham M. Amin
- Department of Hematopathology, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (H.M.A.); (D.V.); (G.E.); (B.G.)
| | - Ajaykumar C. Morani
- Department of Nuclear Medicine, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA;
| | - Najat C. Daw
- Department of Pediatrics, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (N.C.D.); (B.C.); (D.M.); (S.M.)
| | - Salah-Eddine Lamhamedi-Cherradi
- Department of Sarcoma Medical Oncology, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (S.-E.L.-C.); (R.S.B.); (S.P.); (D.A.); (R.R.); (J.A.L.)
| | - Vivek Subbiah
- Department of Investigational Cancer Therapeutics, 7Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (V.S.); (A.N.)
| | - Brian A. Menegaz
- Baylor College of Medicine, Department of Surgery, Breast Surgical Oncology, Houston, TX 77030, USA; (B.A.M.); (E.R.M.)
| | - Deeksha Vishwamitra
- Department of Hematopathology, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (H.M.A.); (D.V.); (G.E.); (B.G.)
| | - Ghazaleh Eskandari
- Department of Hematopathology, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (H.M.A.); (D.V.); (G.E.); (B.G.)
| | - Bhawana George
- Department of Hematopathology, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (H.M.A.); (D.V.); (G.E.); (B.G.)
| | - Robert S. Benjamin
- Department of Sarcoma Medical Oncology, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (S.-E.L.-C.); (R.S.B.); (S.P.); (D.A.); (R.R.); (J.A.L.)
| | - Shreyaskumar Patel
- Department of Sarcoma Medical Oncology, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (S.-E.L.-C.); (R.S.B.); (S.P.); (D.A.); (R.R.); (J.A.L.)
| | - Juhee Song
- Department of Biostatistics, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA;
| | - Alexander J. Lazar
- Department of Pathology, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (A.J.L.); (W.-L.W.)
| | - Wei-Lien Wang
- Department of Pathology, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (A.J.L.); (W.-L.W.)
| | - Razelle Kurzrock
- Center for Personalized Cancer Therapy, University of California San Diego (UCSD) Moores Cancer Center, San Diego, CA 92037, USA;
| | - Alberto Pappo
- Department of Pathology, St. Jude’s Cancer Research Hospital, Memphis, TN 38105, USA;
| | | | - Gary K. Schwartz
- Division of Hematology & Oncology, Columbia University Medical Center, New York, NY 10032, USA;
| | - Dejka Araujo
- Department of Sarcoma Medical Oncology, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (S.-E.L.-C.); (R.S.B.); (S.P.); (D.A.); (R.R.); (J.A.L.)
| | - Branko Cuglievan
- Department of Pediatrics, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (N.C.D.); (B.C.); (D.M.); (S.M.)
| | - Ravin Ratan
- Department of Sarcoma Medical Oncology, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (S.-E.L.-C.); (R.S.B.); (S.P.); (D.A.); (R.R.); (J.A.L.)
| | - David McCall
- Department of Pediatrics, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (N.C.D.); (B.C.); (D.M.); (S.M.)
| | - Sana Mohiuddin
- Department of Pediatrics, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (N.C.D.); (B.C.); (D.M.); (S.M.)
| | - John A. Livingston
- Department of Sarcoma Medical Oncology, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (S.-E.L.-C.); (R.S.B.); (S.P.); (D.A.); (R.R.); (J.A.L.)
| | - Eric R. Molina
- Baylor College of Medicine, Department of Surgery, Breast Surgical Oncology, Houston, TX 77030, USA; (B.A.M.); (E.R.M.)
| | - Aung Naing
- Department of Investigational Cancer Therapeutics, 7Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (V.S.); (A.N.)
| | - Joseph A. Ludwig
- Department of Sarcoma Medical Oncology, the University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; (S.-E.L.-C.); (R.S.B.); (S.P.); (D.A.); (R.R.); (J.A.L.)
- Correspondence: ; Tel.: +1-(713)-792-3626
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Sharma S, Mathre S, Ramya V, Shinde D, Raghu P. Phosphatidylinositol 5 Phosphate 4-Kinase Regulates Plasma-Membrane PIP 3 Turnover and Insulin Signaling. Cell Rep 2020; 27:1979-1990.e7. [PMID: 31091438 PMCID: PMC6591132 DOI: 10.1016/j.celrep.2019.04.084] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 02/06/2019] [Accepted: 04/17/2019] [Indexed: 01/25/2023] Open
Abstract
Phosphatidylinositol 3,4,5-trisphosphate (PIP3) generation at the plasma membrane is a key event during activation of receptor tyrosine kinases such as the insulin receptor required for normal growth and metabolism. We report that in Drosophila, phosphatidylinositol 5 phosphate 4-kinase (PIP4K) is required to limit PIP3 levels during insulin receptor activation. Depletion of PIP4K increases the levels of PIP3 produced in response to insulin stimulation. We find that PIP4K function at the plasma membrane enhances class I phosphoinositide 3-kinase (PI3K) activity, although the catalytic ability of PIP4K to produce phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] at the plasma membrane is dispensable for this regulation. Animals lacking PIP4K show enhanced insulin signaling-dependent phenotypes and are resistant to the metabolic consequences of a high-sugar diet, highlighting the importance of PIP4K in normal metabolism and development. Thus, PIP4Ks are key regulators of receptor tyrosine kinase signaling with implications for growth factor-dependent processes including tumor growth, T cell activation, and metabolism.
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Affiliation(s)
- Sanjeev Sharma
- National Centre for Biological Sciences, TIFR-GKVK Campus, Bellary Road, Bangalore 560065, India
| | - Swarna Mathre
- National Centre for Biological Sciences, TIFR-GKVK Campus, Bellary Road, Bangalore 560065, India; Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
| | - Visvanathan Ramya
- National Centre for Biological Sciences, TIFR-GKVK Campus, Bellary Road, Bangalore 560065, India
| | - Dhananjay Shinde
- National Centre for Biological Sciences, TIFR-GKVK Campus, Bellary Road, Bangalore 560065, India
| | - Padinjat Raghu
- National Centre for Biological Sciences, TIFR-GKVK Campus, Bellary Road, Bangalore 560065, India.
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Irm M, Taj S, Jin M, Timothée Andriamialinirina HJ, Cheng X, Zhou Q. Influence of dietary replacement of fish meal with fish soluble meal on growth and TOR signaling pathway in juvenile black sea bream (Acanthopagrus schlegelii). FISH & SHELLFISH IMMUNOLOGY 2020; 101:269-276. [PMID: 32244030 DOI: 10.1016/j.fsi.2020.03.053] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 03/14/2020] [Accepted: 03/25/2020] [Indexed: 06/11/2023]
Abstract
An 8-week feeding trial was conducted to evaluate the effect of replacement of fish meal (FM) with fish soluble meal (FSM) on growth performance, feed utilization and expression of genes involved in TOR signaling pathway for juvenile black sea bream (Acanthopagrus schlegelii). Six isonitrogenous (41%) and isolipidic diets were prepared to contain graded levels of FSM which replaced 0% (control diet), 10%, 20%, 30%, 40% and 60% protein from FM. Triplicate groups of 20 fish with initial weight 0.51 ± 0.01 g were fed with experimental diets twice daily to apparent satiation. The results showed significant differences in growth performance and feed utilization among all treatments, final body weight (FBW), percent weight gain (PWG), specific growth rate (SGR) and protein efficiency ratio (PER) significantly increased with dietary replacement levels of FM with FSM increasing from 0% to 40% (P < 0.05), PWG, SGR and PER were significantly reduced when replacement of FM with FSM further increased from 40% to 60%. Based on PWG against replacement levels of FM with FSM, A two-slope broken-line model analysis indicated that the optimal replacement of FM with FSM is to be 42.59%. Moreover, the lowest feed conversion ratio (FCR) was observed in fish fed the 40% FSM replacement diet. Muscle amino acid profile in muscle revealed that total essential amino acids, arginine and threonine were significantly influenced by replacement levels of FSM, while there was no significant difference in NEAA among all treatments. The hematological indices were not affected by the replacement levels of FM with FSM. The relative expression levels of irs-1, pi3k, akt, igf-1, s6k1 and tor were up-regulated when replacement levels of FM with FSM increased from 0% to 40%, and higher values were observed in fish fed with 40% FSM replacement diet compared to those fed the other diets. However, relative expression of 4e-bp2 was down-regulated when replacement levels of FM with FSM increased from 0% to 40% (P < 0.05). In summary, the results of present study indicated that FSM could be a viable alternative protein source for black sea bream, dietary FSM supplementation could improve growth and up-regulate the relative expression of irs-1, pi3k, akt, igf-1, s6k1 genes related to TOR signaling pathway in liver of juvenile black sea bream.
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Affiliation(s)
- Misbah Irm
- Laboratory of Fish and Shellfish Nutrition, School of Marine Sciences, Ningbo University, Ningbo, 315211, China
| | - Sehrish Taj
- Laboratory of Fish and Shellfish Nutrition, School of Marine Sciences, Ningbo University, Ningbo, 315211, China
| | - Min Jin
- Laboratory of Fish and Shellfish Nutrition, School of Marine Sciences, Ningbo University, Ningbo, 315211, China.
| | | | - Xin Cheng
- Laboratory of Fish and Shellfish Nutrition, School of Marine Sciences, Ningbo University, Ningbo, 315211, China
| | - Qicun Zhou
- Laboratory of Fish and Shellfish Nutrition, School of Marine Sciences, Ningbo University, Ningbo, 315211, China.
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Khokhar M, Roy D, Modi A, Agarwal R, Yadav D, Purohit P, Sharma P. Perspectives on the role of PTEN in diabetic nephropathy: an update. Crit Rev Clin Lab Sci 2020; 57:470-483. [PMID: 32306805 DOI: 10.1080/10408363.2020.1746735] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Phosphatase and tensin homolog (PTEN) is a potent tumor suppressor gene that antagonizes the proto-oncogenic phosphatidylinositol 3 kinase (PI3K)/protein kinase B (Akt) signaling pathway and governs basic cellular metabolic processes. Recently, its role in cell growth, metabolism, architecture, and motility as an intramolecular and regulatory mediator has gained widespread research interest as it applies to non-tumorous diseases, such as insulin resistance (IR) and diabetic nephropathy (DN). DN is characterized by renal tubulointerstitial fibrosis (TIF) and epithelial-mesenchymal transition (EMT), and PTEN plays a significant role in the regulation of both. Epigenetics and microRNAs (miRNAs) are novel players in post-transcriptional regulation and research evidence demonstrates that they reduce the expression of PTEN by acting as key regulators of autophagy and TIF through activation of the Akt/mammalian target of rapamycin (mTOR) signaling pathway. These regulatory processes might play an important role in solving the complexities of DN pathogenesis and IR, as well as the therapeutic management of DN with the help of PTEN K27-linked polyubiquitination. Currently, there are no comprehensive reviews citing the role PTEN plays in the development of DN and its regulation via miRNA and epigenetic modifications. The present review explores these facets of PTEN in the pathogenesis of IR and DN.
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Affiliation(s)
- Manoj Khokhar
- Department of Biochemistry, All India Institute of Medical Sciences, Jodhpur, India
| | - Dipayan Roy
- Department of Biochemistry, All India Institute of Medical Sciences, Jodhpur, India
| | - Anupama Modi
- Department of Biochemistry, All India Institute of Medical Sciences, Jodhpur, India
| | - Riddhi Agarwal
- Department of Biochemistry, All India Institute of Medical Sciences, Jodhpur, India
| | - Dharmveer Yadav
- Department of Biochemistry, All India Institute of Medical Sciences, Jodhpur, India
| | - Purvi Purohit
- Department of Biochemistry, All India Institute of Medical Sciences, Jodhpur, India
| | - Praveen Sharma
- Department of Biochemistry, All India Institute of Medical Sciences, Jodhpur, India
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40
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Siddiqui JA, Pothuraju R, Jain M, Batra SK, Nasser MW. Advances in cancer cachexia: Intersection between affected organs, mediators, and pharmacological interventions. Biochim Biophys Acta Rev Cancer 2020; 1873:188359. [PMID: 32222610 DOI: 10.1016/j.bbcan.2020.188359] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 03/10/2020] [Accepted: 03/23/2020] [Indexed: 02/06/2023]
Abstract
Advanced cancer patients exhibit cachexia, a condition characterized by a significant reduction in the body weight predominantly from loss of skeletal muscle and adipose tissue. Cachexia is one of the major causes of morbidity and mortality in cancer patients. Decreased food intake and multi-organ energy imbalance in cancer patients worsen the cachexia syndrome. Cachectic cancer patients have a low tolerance for chemo- and radiation therapies and also have a reduced quality of life. The presence of tumors and the current treatment options for cancer further exacerbate the cachexia condition, which remains an unmet medical need. The onset of cachexia involves crosstalk between different organs leading to muscle wasting. Recent advancements in understanding the molecular mechanisms of skeletal muscle atrophy/hypertrophy and adipose tissue wasting/browning provide a platform for the development of new targeted therapies. Therefore, a better understanding of this multifactorial disorder will help to improve the quality of life of cachectic patients. In this review, we summarize the metabolic mediators of cachexia, their molecular functions, affected organs especially with respect to muscle atrophy and adipose browning and then discuss advanced therapeutic approaches to cancer cachexia.
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Affiliation(s)
- Jawed A Siddiqui
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Ramesh Pothuraju
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Maneesh Jain
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA; Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA
| | - Surinder K Batra
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA; Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE, USA; Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA.
| | - Mohd W Nasser
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA; Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE, USA.
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Edick AM, Auclair O, Burgos SA. Role of Grb10 in mTORC1-dependent regulation of insulin signaling and action in human skeletal muscle cells. Am J Physiol Endocrinol Metab 2020; 318:E173-E183. [PMID: 31794259 DOI: 10.1152/ajpendo.00025.2019] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Growth factor receptor-bound protein 10 (Grb10) is an adaptor protein that binds to the insulin receptor, upon which insulin signaling and action are thought to be inhibited. Grb10 is also a substrate for the mechanistic target of rapamycin complex 1 (mTORC1) that mediates its feedback inhibition on phosphatidylinositide 3-kinase (PI3K)/Akt signaling. To characterize the function of Grb10 and its regulation by mTORC1 in human muscle, primary skeletal muscle cells were isolated from healthy lean young men and then induced to differentiate into myotubes. Knockdown of Grb10 enhanced insulin-induced PI3K/Akt signaling and glucose uptake in myotubes, reinforcing the notion underlying its function as a negative regulator of insulin action in human muscle. The increased insulin responsiveness in Grb10-silenced myotubes was associated with a higher abundance of the insulin receptor. Furthermore, insulin and amino acids independently and additively stimulated phosphorylation of Grb10 at Ser476. However, acute inhibition of mTORC1 with rapamycin blocked Grb10 Ser476 phosphorylation and repressed a negative-feedback loop on PI3K/Akt signaling that increased myotube responsiveness to insulin. Chronic rapamycin treatment reduced Grb10 protein abundance in conjunction with increased insulin receptor protein levels. Based on these findings, we propose that mTORC1 controls PI3K/Akt signaling through modulation of insulin receptor abundance by Grb10. These findings have potential implications for obesity-linked insulin resistance, as well as clinical use of mTORC1 inhibitors.
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Affiliation(s)
- Ashlin M Edick
- Department of Animal Science, McGill University, Sainte-Anne-de-Bellevue, Quebec, Canada
| | - Olivia Auclair
- Department of Animal Science, McGill University, Sainte-Anne-de-Bellevue, Quebec, Canada
| | - Sergio A Burgos
- Department of Animal Science, McGill University, Sainte-Anne-de-Bellevue, Quebec, Canada
- Department of Medicine, McGill University, Montreal, Quebec, Canada
- Metabolic Disorders and Complications Program, Research Institute of McGill University Health Centre, Montreal, Quebec, Canada
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Okino R, Usui A, Yoneyama Y, Takahashi SI, Hakuno F. Myoblasts With Higher IRS-1 Levels Are Eliminated From the Normal Cell Layer During Differentiation. Front Endocrinol (Lausanne) 2020; 11:96. [PMID: 32180762 PMCID: PMC7059307 DOI: 10.3389/fendo.2020.00096] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 02/14/2020] [Indexed: 12/14/2022] Open
Abstract
Insulin receptor substrate (IRS)-1 is a major substrate of insulin-like growth factor (IGF)-I receptors. It is well-known that IGF-I and II play essential roles in myogenesis progression. Herein, we report an unexpected phenomenon that IRS-1-overexpressing L6 myoblasts are eliminated from normal cell layers at the beginning of differentiation. Initially, the IRS protein level and apoptosis were examined during myogenic differentiation in L6 myoblasts. We found that the IRS-1 protein level decreased, whereas active caspase 3 increased around 1 day after induction of differentiation. The addition of a pan-caspase inhibitor, Z-VAD-FMK, inhibited differentiation-induced suppression of the IRS-1 protein level. Apoptosis was not enhanced in L6 myoblasts stably expressing high levels of IRS-1 (L6-IRS-1). However, when L6-IRS-1 was cultured with control cells (L6-mock), we observed that L6-IRS-1 was eliminated from the cell layer. We have recently reported that, in L6-IRS-1, internalization of the IGF-I receptor was delayed and IGF signal activation was sustained for a longer period than in L6-mock. When cells stably expressing IRS-1 3YA mutant, which could not maintain the IGF signals, were cultured with normal cells, elimination from the cell layer was not detected. These data suggested that the high level of IRS-1 in myoblasts induces elimination from the cell layer due to abnormal sustainment of IGF-I receptor activation.
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Affiliation(s)
- Ryosuke Okino
- Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Ami Usui
- Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Yosuke Yoneyama
- Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Shin-Ichiro Takahashi
- Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Fumihiko Hakuno
- Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, The University of Tokyo, Tokyo, Japan
- Laboratory of Cell Regulation, Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, The University of Tokyo, Tokyo, Japan
- *Correspondence: Fumihiko Hakuno
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Basit F, de Vries IJM. Dendritic Cells Require PINK1-Mediated Phosphorylation of BCKDE1α to Promote Fatty Acid Oxidation for Immune Function. Front Immunol 2019; 10:2386. [PMID: 31681280 PMCID: PMC6803436 DOI: 10.3389/fimmu.2019.02386] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 09/23/2019] [Indexed: 01/16/2023] Open
Abstract
Dendritic cell (DCs) activation by Toll-like receptor (TLR) agonist induces robust metabolic rewiring toward glycolysis. Recent findings in the field identified mechanistic details governing these metabolic adaptations. However, it is unknown whether a switch to glycolysis from oxidative phosphorylation (OXPHOS) is a general characteristic of DCs upon pathogen encounter. Here we show that engagement of different TLR triggers differential metabolic adaptations in DCs. We demonstrate that LPS-mediated TLR4 stimulation induces glycolysis in DCs. Conversely, activation of TLR7/8 with protamine-RNA complex, pRNA, leads to an increase in OXPHOS. Mechanistically, we found that pRNA stimulation phosphorylates BCKDE1α in a PINK1-dependent manner. pRNA stimulation increased branched-chain amino acid levels and increased fatty acid oxidation. Increased FAO and OXPHOS are required for DC activation. PINK1 deficient DCs switch to glycolysis to maintain ATP levels and viability. Moreover, pharmacological induction of PINK1 kinase activity primed immunosuppressive DC for immunostimulatory function. Our findings provide novel insight into differential metabolic adaptations and reveal the important role of branched-chain amino acid in regulating immune response in DC.
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Affiliation(s)
- Farhan Basit
- Department of Tumor Immunology, Radboud University Medical Center, Radboud Institute for Molecular Life Sciences, Nijmegen, Netherlands
| | - I Jolanda M de Vries
- Department of Tumor Immunology, Radboud University Medical Center, Radboud Institute for Molecular Life Sciences, Nijmegen, Netherlands.,Department of Medical Oncology, Radboud University Medical Center, Nijmegen, Netherlands
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Zhou JJ, Chun L, Liu JF. A Comprehensive Understanding of Dietary Effects on C. elegans Physiology. Curr Med Sci 2019; 39:679-684. [PMID: 31612382 DOI: 10.1007/s11596-019-2091-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 03/14/2019] [Indexed: 02/07/2023]
Abstract
Diet has been shown to play an important role in human physiology. It is a predominant exogenous factor regulating the composition of gut microbiota, and dietary intervention holds promise for treatment of diseases such as obesity, type 2 diabetes, and malnutrition. Furthermore, it was reported that diet has significant effects on physiological processes of C. elegans, including reproduction, fat storage, and aging. To reveal novel signaling pathways responsive to different diets, C. elegans and its bacterial diet were used as an interspecies model system to mimic the interaction between host and gut microbiota. Most signaling pathways identified in C. elegans are highly conserved across different species, including humans. A better understanding of these pathways can, therefore, help to develop interventions for human diseases. In this article, we summarize recent achievements on molecular mechanisms underlying the response of C. elegans to different diets and discuss their relevance to human health.
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Affiliation(s)
- Jie-Jun Zhou
- Collaborative Innovation Center for Brain Science, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Lei Chun
- Collaborative Innovation Center for Brain Science, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China.
| | - Jian-Feng Liu
- Collaborative Innovation Center for Brain Science, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China.
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Chiarini F, Evangelisti C, Lattanzi G, McCubrey JA, Martelli AM. Advances in understanding the mechanisms of evasive and innate resistance to mTOR inhibition in cancer cells. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2019; 1866:1322-1337. [PMID: 30928610 DOI: 10.1016/j.bbamcr.2019.03.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 03/22/2019] [Accepted: 03/26/2019] [Indexed: 12/12/2022]
Abstract
The development of drug-resistance by neoplastic cells is recognized as a major cause of targeted therapy failure and disease progression. The mechanistic (previously mammalian) target of rapamycin (mTOR) is a highly conserved Ser/Thr kinase that acts as the catalytic subunit of two structurally and functionally distinct large multiprotein complexes, referred to as mTOR complex 1 (mTORC1) and mTORC2. Both mTORC1 and mTORC2 play key roles in a variety of healthy cell types/tissues by regulating physiological anabolic and catabolic processes in response to external cues. However, a body of evidence identified aberrant activation of mTOR signaling as a common event in many human tumors. Therefore, mTOR is an attractive target for therapeutic targeting in cancer and this fact has driven the development of numerous mTOR inhibitors, several of which have progressed to clinical trials. Nevertheless, mTOR inhibitors have met with a very limited success as anticancer therapeutics. Among other reasons, this failure was initially ascribed to the activation of several compensatory signaling pathways that dampen the efficacy of mTOR inhibitors. The discovery of these regulatory feedback mechanisms greatly contributed to a better understanding of cancer cell resistance to mTOR targeting agents. However, over the last few years, other mechanisms of resistance have emerged, including epigenetic alterations, compensatory metabolism rewiring and the occurrence of mTOR mutations. In this article, we provide the reader with an updated overview of the mechanisms that could explain resistance of cancer cells to the various classes of mTOR inhibitors.
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Affiliation(s)
- Francesca Chiarini
- CNR Institute of Molecular Genetics, 40136 Bologna, BO, Italy; IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, BO, Italy
| | - Camilla Evangelisti
- CNR Institute of Molecular Genetics, 40136 Bologna, BO, Italy; IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, BO, Italy
| | - Giovanna Lattanzi
- CNR Institute of Molecular Genetics, 40136 Bologna, BO, Italy; IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, BO, Italy
| | - James A McCubrey
- Department of Microbiology & Immunology, Brody School of Medicine, East Carolina University, Greenville, NC 27834, USA.
| | - Alberto M Martelli
- Department of Biomedical and Neuromotor Sciences, University of Bologna, 40126 Bologna, BO, Italy.
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Bresnick AR, Backer JM. PI3Kβ-A Versatile Transducer for GPCR, RTK, and Small GTPase Signaling. Endocrinology 2019; 160:536-555. [PMID: 30601996 PMCID: PMC6375709 DOI: 10.1210/en.2018-00843] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 12/20/2018] [Indexed: 12/17/2022]
Abstract
The phosphoinositide 3-kinase (PI3K) family includes eight distinct catalytic subunits and seven regulatory subunits. Only two PI3Ks are directly regulated downstream from G protein-coupled receptors (GPCRs): the class I enzymes PI3Kβ and PI3Kγ. Both enzymes produce phosphatidylinositol 3,4,5-trisposphate in vivo and are regulated by both heterotrimeric G proteins and small GTPases from the Ras or Rho families. However, PI3Kβ is also regulated by direct interactions with receptor tyrosine kinases (RTKs) and their tyrosine phosphorylated substrates, and similar to the class II and III PI3Ks, it binds activated Rab5. The unusually complex regulation of PI3Kβ by small and trimeric G proteins and RTKs leads to a rich landscape of signaling responses at the cellular and organismic levels. This review focuses first on the regulation of PI3Kβ activity in vitro and in cells, and then summarizes the biology of PI3Kβ signaling in distinct tissues and in human disease.
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Affiliation(s)
- Anne R Bresnick
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York
| | - Jonathan M Backer
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York
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Dungan CM, Gordon BS, Williamson DL. Acute treadmill exercise discriminately improves the skeletal muscle insulin-stimulated growth signaling responses in mice lacking REDD1. Physiol Rep 2019; 7:e14011. [PMID: 30806987 PMCID: PMC6383112 DOI: 10.14814/phy2.14011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 02/01/2019] [Indexed: 12/12/2022] Open
Abstract
A loss of the regulated in development and DNA damage 1 (REDD1) hyperactivates mechanistic Target of Rapamycin Complex 1 (mTORC1) reducing insulin-stimulated insulin signaling, which could provide insight into mechanisms of insulin resistance. Although aerobic exercise acutely inhibits mTORC1 signaling, improvements in insulin-stimulated signaling are exhibited. The goal of this study was to determine if a single bout of treadmill exercise was sufficient to improve insulin signaling in mice lacking REDD1. REDD1 wildtype (WT) and REDD1 knockout (KO) mice were acutely exercised on a treadmill (30 min, 20 m/min, 5% grade). A within animal noninsulin-to-insulin-stimulated percent change in skeletal muscle insulin-stimulated kinases (IRS-1, ERK1/2, Akt), growth signaling activation (4E-BP1, S6K1), and markers of growth repression (REDD1, AMPK, FOXO1/3A) was examined, following no exercise control or an acute bout of exercise. Unlike REDD1 KO mice, REDD1 WT mice exhibited an increase (P < 0.05) in REDD1 following treadmill exercise. However, both REDD1 WT and KO mice exhibited an increase (P < 0.05) AMPK phosphorylation, and a subsequent reduction (P < 0.05) in mTORC1 signaling after the exercise bout versus nonexercising WT or KO mice. Exercise increased (P < 0.05) the noninsulin-to-insulin-stimulated percent change phosphorylation of mTORC1, ERK1/2, IRS-1, and Akt on S473 in REDD1 KO mice when compared to nonexercised KO mice. However, there was no change in the noninsulin-to-insulin-stimulated percent change activation of Akt on T308 and FOXO1/3A in the KO when compared to WT or KO mouse muscle after exercise. Our data show that a bout of treadmill exercise discriminately improves insulin-stimulated signaling in the absence of REDD1.
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Affiliation(s)
- Cory M. Dungan
- Department of Rehabilitation SciencesCollege of Health SciencesUniversity of KentuckyLexingtonKentucky
| | - Bradley S. Gordon
- Department of Nutrition, Food, and Exercise SciencesCollege of Human SciencesFlorida State UniversityTallahasseeFlorida
| | - David L. Williamson
- Kinesiology ProgramSchool of Behavioral Sciences and EducationPenn State HarrisburgMiddletownPennsylvania
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Igawa H, Kikuchi A, Misu H, Ishii K, Kaneko S, Takamura T. p62-mediated autophagy affects nutrition-dependent insulin receptor substrate 1 dynamics in 3T3-L1 preadipocytes. J Diabetes Investig 2019; 10:32-42. [PMID: 29786968 PMCID: PMC6319485 DOI: 10.1111/jdi.12866] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 05/11/2018] [Accepted: 05/16/2018] [Indexed: 01/22/2023] Open
Abstract
AIMS/INTRODUCTION Previous studies have shown that an organism's nutritional status changes the protein levels of insulin receptor substrate 1 (IRS-1) in a tissue-specific manner. Although the mechanisms underlying the regulation of IRS-1 in the nutrient-rich conditions associated with diabetes and insulin resistance have been well studied, those under nutrient-poor conditions remain unknown. The aim of the present study was to investigate how IRS-1 protein levels change depending on the nutritional status of 3T3-L1 preadipocytes. MATERIALS AND METHODS 3T3-L1 preadipocytes were treated with glucose-, amino acid- and serum-free medium for starvation. IRS-1 protein levels were detected by western blot. Autophagy activity was observed by western blot and fluorescence microscopy. The effect of autophagy and p62, an adaptor for selective autophagy, on IRS-1 protein levels under starvation conditions was examined by western blot and immunocytochemistry. RESULTS We showed that the levels of IRS-1, but not those of insulin receptor and protein kinase B, decreased when starvation activated autophagy. The inhibition of autophagy by chloroquine or autophagy-related 7 (Atg7) ribonucleic acid interference counteracted the starvation-induced decrease of IRS-1. Additionally, Atg7 knockdown increased insulin-stimulated phosphorylation of protein kinase B under starvation conditions. Furthermore, p62 colocalized with IRS-1 under starvation conditions, and p62 knockdown counteracted the starvation-induced degradation of IRS-1. CONCLUSIONS Autophagy through p62 plays an important role in regulating IRS-1 protein levels in response to nutritional deficiency. The present findings suggest that autophagy might function as energy depletion-sensing machinery that finely tunes insulin signal transduction.
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Affiliation(s)
- Hirobumi Igawa
- Department of Endocrinology and MetabolismKanazawa University Graduate School of Medical SciencesKanazawaIshikawaJapan
- Department of System BiologyKanazawa University Graduate School of Medical SciencesKanazawaIshikawaJapan
| | - Akihiro Kikuchi
- Department of Endocrinology and MetabolismKanazawa University Graduate School of Medical SciencesKanazawaIshikawaJapan
| | - Hirofumi Misu
- Department of Endocrinology and MetabolismKanazawa University Graduate School of Medical SciencesKanazawaIshikawaJapan
- PRESTOJapan Science and Technology AgencyKawaguchiSaitamaJapan
| | - Kiyo‐aki Ishii
- Department of Endocrinology and MetabolismKanazawa University Graduate School of Medical SciencesKanazawaIshikawaJapan
- Department of System BiologyKanazawa University Graduate School of Medical SciencesKanazawaIshikawaJapan
| | - Shuichi Kaneko
- Department of System BiologyKanazawa University Graduate School of Medical SciencesKanazawaIshikawaJapan
| | - Toshinari Takamura
- Department of Endocrinology and MetabolismKanazawa University Graduate School of Medical SciencesKanazawaIshikawaJapan
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Mirzoev TM, Tyganov SA, Petrova IO, Shenkman BS. Acute recovery from disuse atrophy: the role of stretch-activated ion channels in the activation of anabolic signaling in skeletal muscle. Am J Physiol Endocrinol Metab 2019; 316:E86-E95. [PMID: 30457911 DOI: 10.1152/ajpendo.00261.2018] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The aim of the study was to 1) measure time-course alternations in the rate of protein synthesis (PS) and phosphorylation status of the key anabolic markers, and 2) find out the role of stretch-activated ion channels (SACs) in the activation of anabolic signaling in the rat soleus during an acute reloading following disuse atrophy. Wistar rats were subjected to 14-day hindlimb suspension (HS) followed by 6, 12, and 24 h of reloading. To examine the role of SAC in the reloading-induced activation of anabolic signaling, the rats were treated with gadolinium (Gd3+), a SAC blocker. The content of signaling proteins was determined by Western blot. c-Myc mRNA expression was assessed by RT-PCR. After 24-h reloading, the PS rate was elevated by 44% versus control. After 6-h reloading, the p-70-kDa ribosomal protein S6 kinase (p70S6k) and translation initiation factor 4E-binding protein 1 (4E-BP1) did not differ from control; however, 12-h reloading resulted in an upregulation of both p70s6k and 4E-BP1 phosphorylation versus control. The phosphorylation of AKT (Ser473) and glycogen synthase kinase-3β (Ser9) was reduced after HS and then completely restored by 12-h reloading. c-Myc was significantly upregulated during the entire reloading. Gd3+ treatment during reloading (12 h) prevented a full phosphorylation of p70S6k, rpS6, 4E-BP1, as well as PS activation. The results of the study suggest that 1) enhanced PS during the acute recovery from HS may be associated with the activation of ribosome biogenesis as well as mammalian target of rapamycin complex 1 (mTORC1)-dependent signaling pathways, and 2) functional SACs are necessary for complete activation of mTORC1 signaling in rat soleus during acute recovery from HS.
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Affiliation(s)
- Timur M Mirzoev
- Myology Laboratory, Institute of Biomedical Problems, Russian Academy of Sciences , Moscow , Russia
| | - Sergey A Tyganov
- Myology Laboratory, Institute of Biomedical Problems, Russian Academy of Sciences , Moscow , Russia
| | - Irina O Petrova
- Myology Laboratory, Institute of Biomedical Problems, Russian Academy of Sciences , Moscow , Russia
| | - Boris S Shenkman
- Myology Laboratory, Institute of Biomedical Problems, Russian Academy of Sciences , Moscow , Russia
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Kelly SC, Patel NN, Eccardt AM, Fisher JS. Glucose-dependent trans-plasma membrane electron transport and p70 S6k phosphorylation in skeletal muscle cells. Redox Biol 2018; 27:101075. [PMID: 30578122 PMCID: PMC6859557 DOI: 10.1016/j.redox.2018.101075] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 12/07/2018] [Accepted: 12/10/2018] [Indexed: 11/05/2022] Open
Abstract
The reduction of extracellular oxidants by intracellular electrons is known as trans-plasma membrane electron transport (tPMET). The goal of this study was to characterize a role of tPMET in the sensing of glucose as a physiological signal. tPMET from C2C12 myotubes was monitored using a cell-impermeable extracellular electron acceptor, water-soluble tetrazolium salt-1 (WST-1). Superoxide dismutase in the incubation medium or exposure to an NADPH oxidase (NOX) isoform 1/4 inhibitor suppressed WST-1 reduction by 70%, suggesting a role of NOXs in tPMET. There was a positive correlation between medium glucose concentration and WST-1 reduction, suggesting that tPMET is a glucose-sensing process. WST-1 reduction was also decreased by an inhibitor of the pentose phosphate pathway, dehydroepiandrosterone. In contrast, glycolytic inhibitors, 3PO and sodium fluoride, did not affect WST-1 reduction. Thus, it appears that glucose uptake and processing in the pentose phosphate pathway drives NOX-dependent tPMET. Western blot analysis demonstrated that p70S6k phosphorylation is glucose-dependent, while the phosphorylation of AKT and MAPK did not differ in the presence or absence of glucose. Further, phosphorylation of p70S6k was dependent upon NOX enzymes. Finally, glucose was required for full stimulation of p70S6k by insulin, again in a fashion prevented by NOX inhibition. Taken together, the data suggest that muscle cells have a novel glucose-sensing mechanism dependent on NADPH production and NOX activity, culminating in increased p70S6k phosphorylation.
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Affiliation(s)
- Shannon C Kelly
- Department of Biology, Saint Louis University, St. Louis, MO, United States
| | - Neej N Patel
- Department of Biology, Saint Louis University, St. Louis, MO, United States
| | - Amanda M Eccardt
- Department of Biology, Saint Louis University, St. Louis, MO, United States
| | - Jonathan S Fisher
- Department of Biology, Saint Louis University, St. Louis, MO, United States.
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