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Desmarini D, Liu G, Jessen H, Bowring B, Connolly A, Crossett B, Djordjevic JT. Arg1 from Cryptococcus neoformans lacks PI3 kinase activity and conveys virulence roles via its IP 3-4 kinase activity. mBio 2024:e0060824. [PMID: 38742909 DOI: 10.1128/mbio.00608-24] [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: 02/26/2024] [Accepted: 04/18/2024] [Indexed: 05/16/2024] Open
Abstract
Inositol tris/tetrakis phosphate kinases (IP3-4K) in the human fungal priority pathogens, Cryptococcus neoformans (CnArg1) and Candida albicans (CaIpk2), convey numerous virulence functions, yet it is not known whether the IP3-4K catalytic activity or a scaffolding role is responsible. We therefore generated a C. neoformans strain with a non-functional kinase, referred to as the dead-kinase (dk) CnArg1 strain (dkArg1). We verified that, although dkARG1 cDNA cloned from this strain produced a protein with the expected molecular weight, dkArg1 was catalytically inactive with no IP3-4K activity. Using recombinant CnArg1 and CaIpk2, we confirmed that, unlike the IP3-4K homologs in humans and Saccharomyces cerevisiae, CnArg1 and CaIpk2 do not phosphorylate the lipid-based substrate, phosphatidylinositol 4,5-bisphosphate, and therefore do not function as class I PI3Ks. Inositol polyphosphate profiling using capillary electrophoresis-electrospray ionization-mass spectrometry revealed that IP3 conversion is blocked in the dkArg1 and ARG1 deletion (Cnarg1Δ) strains and that 1-IP7 and a recently discovered isomer (4/6-IP7) are made by wild-type C. neoformans. Importantly, the dkArg1 and Cnarg1Δ strains had similar virulence defects, including suppressed growth at 37°C, melanization, capsule production, and phosphate starvation response, and were avirulent in an insect model, confirming that virulence is dependent on IP3-4K catalytic activity. Our data also implicate the dkArg1 scaffold in transcriptional regulation of arginine metabolism but via a different mechanism to S. cerevisiae since CnArg1 is dispensable for growth on different nitrogen sources. IP3-4K catalytic activity therefore plays a dominant role in fungal virulence, and IPK pathway function has diverged in fungal pathogens.IMPORTANCEThe World Health Organization has emphasized the urgent need for global action in tackling the high morbidity and mortality rates stemming from invasive fungal infections, which are exacerbated by the limited variety and compromised effectiveness of available drug classes. Fungal IP3-4K is a promising target for new therapy, as it is critical for promoting virulence of the human fungal priority pathogens, Cryptococcus neoformans and Candida albicans, and impacts numerous functions, including cell wall integrity. This contrasts to current therapies, which only target a single function. IP3-4K enzymes exert their effect through their inositol polyphosphate products or via the protein scaffold. Here, we confirm that the IP3-4K catalytic activity of CnArg1 promotes all virulence traits in C. neoformans that are attenuated by ARG1 deletion, reinforcing our ongoing efforts to find inositol polyphosphate effector proteins and to create inhibitors targeting the IP3-4K catalytic site, as a new antifungal drug class.
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Affiliation(s)
- Desmarini Desmarini
- Centre for Infectious Diseases and Microbiology, The Westmead Institute for Medical Research, Sydney, Australia
- Faculty of Medicine and Health, Sydney Institute for Infectious Diseases, University of Sydney, Sydney, Australia
| | - Guizhen Liu
- Institute of Organic Chemistry, University of Freiburg, Freiburg im Breisgau, Germany
- Centre for Integrative Biological Signaling Studies, University of Freiburg, Freiburg im Breisgau, Germany
| | - Henning Jessen
- Institute of Organic Chemistry, University of Freiburg, Freiburg im Breisgau, Germany
- Centre for Integrative Biological Signaling Studies, University of Freiburg, Freiburg im Breisgau, Germany
| | - Bethany Bowring
- Centre for Infectious Diseases and Microbiology, The Westmead Institute for Medical Research, Sydney, Australia
- Faculty of Medicine and Health, Sydney Institute for Infectious Diseases, University of Sydney, Sydney, Australia
| | - Angela Connolly
- Sydney Mass Spectrometry, University of Sydney, Sydney, Australia
| | - Ben Crossett
- Sydney Mass Spectrometry, University of Sydney, Sydney, Australia
| | - Julianne Teresa Djordjevic
- Centre for Infectious Diseases and Microbiology, The Westmead Institute for Medical Research, Sydney, Australia
- Faculty of Medicine and Health, Sydney Institute for Infectious Diseases, University of Sydney, Sydney, Australia
- Westmead Hospital, Western Sydney Local Health District, Sydney, Australia
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2
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Kahkesh S, Khoshnazar SM, Gholinezhad Y, Esmailzadeh S, Hosseini SA, Alimohammadi M, Mafi A. The potential role of circular RNAs -regulated PI3K signaling in non-small cell lung cancer: Molecular insights and clinical perspective. Pathol Res Pract 2024; 257:155316. [PMID: 38692125 DOI: 10.1016/j.prp.2024.155316] [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: 02/29/2024] [Revised: 04/11/2024] [Accepted: 04/16/2024] [Indexed: 05/03/2024]
Abstract
Non-small cell lung cancer (NSCLC), accounting for more than 80% of all cases, is the predominant form of lung cancer and the leading cause of cancer-related deaths worldwide. Significant progress has been made in diagnostic techniques, surgical interventions, chemotherapy protocols, and targeted therapies at the molecular level, leading to enhanced treatment outcomes in patients with NSCLC. Extensive evidence supports the use of circular RNAs (circRNAs), a specific category of naturally occurring non-coding small RNAs (ncRNAs), for the diagnosis, monitoring of treatment efficacy, and assessment of survival in NSCLC. CircRNAs have been identified to play significant roles in various aspects of cancer formation, either as tumor suppressors or tumor promoters, contributing to cancer development through several signaling pathways, including the phosphoinositide 3-kinases (PI3Ks) pathway. This pathway is well-established because of its regulatory role in essential cellular processes. CircRNAs regulate the PI3K/AKT pathway by targeting diverse cellular elements. This review aims to provide insight into the involvement of several circRNAs linked to the PI3K/AKT pathway in NSCLC.
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Affiliation(s)
- Samaneh Kahkesh
- Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
| | - Seyedeh Mahdieh Khoshnazar
- Gastroenterology and Hepatology Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Sciences, Kerman, Iran
| | - Yasaman Gholinezhad
- Department of Pharmacology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Shakiba Esmailzadeh
- School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Seyed Ali Hosseini
- Student Research Committee, Department of Immunology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mina Alimohammadi
- Department of Immunology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Alireza Mafi
- Nutrition and Food Security Research Center, Isfahan University of Medical Sciences, Isfahan, Iran; Department of Clinical Biochemistry, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran.
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Khorasani ABS, Hafezi N, Sanaei MJ, Jafari-Raddani F, Pourbagheri-Sigaroodi A, Bashash D. The PI3K/AKT/mTOR signaling pathway in breast cancer: Review of clinical trials and latest advances. Cell Biochem Funct 2024; 42:e3998. [PMID: 38561964 DOI: 10.1002/cbf.3998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 03/11/2024] [Accepted: 03/21/2024] [Indexed: 04/04/2024]
Abstract
Breast cancer (BC) is the most commonly diagnosed cancer and the leading cause of cancer mortality in women. As the phosphatidylinositol 3-kinase (PI3K) signaling pathway is involved in a wide range of physiological functions of cells including growth, proliferation, motility, and angiogenesis, any alteration in this axis could induce oncogenic features; therefore, numerous preclinical and clinical studies assessed agents able to inhibit the components of this pathway in BC patients. To the best of our knowledge, this is the first study that analyzed all the registered clinical trials investigating safety and efficacy of the PI3K/AKT/mTOR axis inhibitors in BC. Of note, we found that the trends of PI3K inhibitors in recent years were superior as compared with the inhibitors of either AKT or mTOR. However, most of the trials entering phase III and IV used mTOR inhibitors (majorly Everolimus) followed by PI3K inhibitors (majorly Alpelisib) leading to the FDA approval of these drugs in the BC context. Despite favorable efficacies, our analysis shows that the majority of trials are utilizing PI3K pathway inhibitors in combination with hormone therapy and chemotherapy; implying monotherapy cannot yield huge clinical benefits, at least partly, due to the activation of compensatory mechanisms. To emphasize the beneficial effects of these inhibitors in combined-modal strategies, we also reviewed recent studies which investigated the conjugation of nanocarriers with PI3K inhibitors to reduce harmful toxicities, increase the local concentration, and improve their efficacies in the context of BC therapy.
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Affiliation(s)
| | - Nasim Hafezi
- Cellular and Molecular Biology Research Center, Babol University of Medical Sciences, Babol, Iran
| | - Mohammad-Javad Sanaei
- Department of Hematology and Blood Banking, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Farideh Jafari-Raddani
- Department of Hematology and Blood Banking, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Atieh Pourbagheri-Sigaroodi
- Department of Hematology and Blood Banking, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Davood Bashash
- Department of Hematology and Blood Banking, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Yao M, Mao X, Zhang Z, Cui F, Shao S, Mao B. Communication molecules (ncRNAs) mediate tumor-associated macrophage polarization and tumor progression. Front Cell Dev Biol 2024; 12:1289538. [PMID: 38523627 PMCID: PMC10957787 DOI: 10.3389/fcell.2024.1289538] [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: 09/06/2023] [Accepted: 02/15/2024] [Indexed: 03/26/2024] Open
Abstract
Non-coding RNAs play important roles in tumor cells and macrophages and participate in their communication as messengers. Non-coding RNAs have an impact in tumor cell proliferation, migration, and apoptosis, and they also regulate the differentiation and regulation of immune cells. In macrophages, they stimulate the polarization of macrophages into M1 or M2 by regulating proteins related to signaling pathways; in tumor cells, non-coding RNAs can enter macrophages through exosomes and affect the latter polarization. The polarization of macrophages further regulates the biological functions of cancer cells. The direction of macrophage polarization determines tumor progression, angiogenesis and drug resistance. This often creates a feedback loop. Non-coding RNAs act as bridges between tumor cells and macrophages to regulate the balance of the tumor microenvironment. We reviewed the signaling pathways related to macrophage polarization and the regulatory mechanisms of non-coding RNA in tumor-associated macrophages M1 and M2, and discussed the potential applications and prospects of exosome engineering.
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Affiliation(s)
- Min Yao
- The Affiliated Yixing Hospital of Jiangsu University, WuXi, China
- School of Medicine, Jiangsu University, Zhenjiang, China
| | - Xuhua Mao
- The Affiliated Yixing Hospital of Jiangsu University, WuXi, China
| | - Zherui Zhang
- School of Medicine, Jiangsu University, Zhenjiang, China
| | - Feilun Cui
- The Affiliated Taizhou Second People`s Hospital of Yangzhou University, Taizhou, Jiangsu, China
| | - Shihe Shao
- The Affiliated Yixing Hospital of Jiangsu University, WuXi, China
- School of Medicine, Jiangsu University, Zhenjiang, China
| | - Boneng Mao
- The Affiliated Yixing Hospital of Jiangsu University, WuXi, China
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Akkus E, Tuncalı T, Akın HY, Aydın Y, Beşışık SK, Gürkan E, Ratip S, Salihoğlu A, Sargın D, Ünal A, Turcan A, Sevindik ÖG, Demir M, Beksac M. Germline genetic variants in Turkish familial multiple myeloma/monoclonal gammopathy of undetermined significance cases. Br J Haematol 2024; 204:931-938. [PMID: 38115798 DOI: 10.1111/bjh.19271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 11/27/2023] [Accepted: 12/09/2023] [Indexed: 12/21/2023]
Abstract
Multiple myeloma (MM) is a haematological malignancy primarily affecting the elderly, with a striking male predilection and ethnic disparities in incidence. Familial predisposition to MM has long been recognized, but the genetic underpinnings remain elusive. This study aimed to investigate germline variants in Turkish families with recurrent MM cases. A total of 37 MM-affected families, comprising 77 individuals, were included. Targeted next-generation sequencing analysis yielded no previously reported rare variants. Whole exome sequencing analysis in 11 families identified rare disease-causing variants in various genes, some previously linked to familial MM and others not previously associated. Notably, genes involved in ubiquitination, V(D)J recombination and the PI3K/AKT/mTOR pathway were among those identified. Furthermore, a specific variant in BNIP1 (rs28199) was found in 13 patients across nine families, indicating its potential significance in MM pathogenesis. While this study sheds light on genetic variations in familial MM in Turkey, its limitations include sample size and the absence of in vivo investigations. In conclusion, familial MM likely involves a polygenic inheritance pattern with rare, disease-causing variants in various genes, emphasizing the need for international collaborative efforts to unravel the intricate genetic basis of MM and develop targeted therapies.
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Affiliation(s)
- Erman Akkus
- Department of Internal Medicine, Ankara University Faculty of Medicine, Ankara, Turkey
| | - Timur Tuncalı
- Department of Medical Genetics, Ankara University Faculty of Medicine, Ankara, Turkey
| | - Hasan Yalım Akın
- Department of Hematology, Ankara University Faculty of Medicine, Ankara, Turkey
| | - Yıldız Aydın
- Department of Hematology, Florence Nightingale Hospitals, Istanbul, Turkey
| | - Sevgi Kalayoğlu Beşışık
- Department of Internal Medicine, Division of Hematology, Istanbul University Medical Faculty, Istanbul, Turkey
| | - Emel Gürkan
- Department of Hematology, Cukurova University Faculty of Medicine, Adana, Turkey
| | - Siret Ratip
- Department of Hematology, Acibadem Healthcare Group, Istanbul, Turkey
| | - Ayşe Salihoğlu
- Department of Hematology, Istanbul University Cerrahpasa Faculty of Medicine, Istanbul, Turkey
| | - Deniz Sargın
- Department of Hematology, Medipol University Faculty of Medicine, İstanbul, Turkey
| | - Ali Ünal
- Department of Hematology, Erciyes University Faculty of Medicine, Kayseri, Turkey
| | | | - Ömür Gökmen Sevindik
- Department of Hematology, Medipol University Faculty of Medicine, İstanbul, Turkey
| | - Muzaffer Demir
- Department of Hematology, Trakya University Faculty of Medicine, Edirne, Turkey
| | - Meral Beksac
- Department of Hematology, Ankara University Faculty of Medicine, Ankara, Turkey
- Department of Hematology, Ankara Liv Hospital, Istinye University, Ankara, Turkey
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Yu Y, Gu D, Cai L, Yang H, Sheng R. Development of small-molecule inhibitors that target PI3Kβ. Drug Discov Today 2024; 29:103854. [PMID: 38070704 DOI: 10.1016/j.drudis.2023.103854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 11/30/2023] [Accepted: 12/05/2023] [Indexed: 12/18/2023]
Abstract
Phosphatidylinositol-3 kinase (PI3K) β, a subtype of class I PI3Ks, has an essential role in PTEN-deficient tumors and links to thrombosis, male fertility, and Fragile X syndrome. PI3Kβ-specific targeting therapy could be an efficacious treatment for diseases highly dependent on PI3Kβ, while mitigating the severe toxicity of pan-PI3K inhibitors. Achieving selectivity can be accomplished through three primary strategies, namely, binding to the induced lipophilic pocket, targeting the unique amino acid residue of PI3Kβ, or using atropisomerism to lock conformation. In this review, we focus on advances in the development of these β-isoform-selective PI3K inhibitors, providing potential guidance for the further development of novel clinical candidates.
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Affiliation(s)
- Yanzhen Yu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, PR China
| | - Dongyan Gu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, PR China
| | - Lvtao Cai
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, PR China; Jinhua Institute of Zhejiang University, Jinhua, Zhejiang 321000, PR China
| | - Haodong Yang
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, PR China; Jinhua Institute of Zhejiang University, Jinhua, Zhejiang 321000, PR China
| | - Rong Sheng
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, PR China; Jinhua Institute of Zhejiang University, Jinhua, Zhejiang 321000, PR China.
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Masliukov PM. Changes of Signaling Pathways in Hypothalamic Neurons with Aging. Curr Issues Mol Biol 2023; 45:8289-8308. [PMID: 37886966 PMCID: PMC10605528 DOI: 10.3390/cimb45100523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 10/01/2023] [Accepted: 10/10/2023] [Indexed: 10/28/2023] Open
Abstract
The hypothalamus is an important regulator of autonomic and endocrine functions also involved in aging regulation. The aging process in the hypothalamus is accompanied by disturbed intracellular signaling including insulin/insulin-like growth factor-1 (IGF-1)/growth hormone (GH), phosphatidylinositol-4,5-bisphosphate 3-kinase (PI3K)/protein kinase B (AKT)/the mammalian target of rapamycin (mTOR), mitogen activated protein kinase (MAPK), janus kinase (JAK)/signal transducer and activator of transcription (STAT), AMP-activated protein kinase (AMPK), nuclear factor kappa-light-chain-enhancer of activated B cells (NF-ĸB), and nitric oxide (NO). In the current review, I have summarized the current understanding of the changes in the above-mentioned pathways in aging with a focus on hypothalamic alterations.
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Affiliation(s)
- Petr M Masliukov
- Department Normal Physiology, Yaroslavl State Medical University, ul. Revoliucionnaya 5, 150000 Yaroslavl, Russia
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Kargbo RB. New Horizons in Cancer Treatment: A Closer Look at Novel PI3Kα Inhibitors. ACS Med Chem Lett 2023; 14:1138-1140. [PMID: 37736174 PMCID: PMC10510510 DOI: 10.1021/acsmedchemlett.3c00307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Indexed: 09/23/2023] Open
Abstract
Phosphoinositide 3-kinase (PI3K), a lipid messenger in cellular biology, regulates numerous cellular responses, including cell survival and migration. Abnormal activation of PI3K has been identified in many human tumors, implicating it as a pivotal point in cancer research. PI3K inhibitors have shown promise in controlling tumor progression and chemotherapy resistance. However, challenges like cutaneous adverse effects require further research. The PI3K signaling pathway's role in cellular processes, such as aging and Alzheimer's disease progression, also signifies its importance in drug development for aging-related diseases. Future research promises innovative therapeutic strategies targeting PI3K in managing cancer, aging, and neurodegenerative diseases. This Patent Highlight showcases compounds and compositions that may enlarge the PI3K inhibitory therapeutic window-effectively inhibiting the target in cancer cells while reducing toxicity in patients.
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Ghahari N, Telittchenko R, Loucif H, Isnard S, Routy JP, Olagnier D, van Grevenynghe J. Harnessing Autophagy to Overcome Antigen-Specific T-Cell Dysfunction: Implication for People Living with HIV-1. Int J Mol Sci 2023; 24:11018. [PMID: 37446195 DOI: 10.3390/ijms241311018] [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: 06/09/2023] [Revised: 06/29/2023] [Accepted: 07/01/2023] [Indexed: 07/15/2023] Open
Abstract
Like other chronic viral infections, HIV-1 persistence inhibits the development of antigen-specific memory T-cells, resulting in the exhaustion of the immune response and chronic inflammation. Autophagy is a major lysosome-dependent mechanism of intracellular large-target degradation such as lipid and protein aggregates, damaged organelles, and intracellular pathogens. Although it is known that autophagy may target HIV-1 for elimination, knowledge of its function as a metabolic contributor in such viral infection is only in its infancy. Recent data show that elite controllers (EC), who are HIV-1-infected subjects with natural and long-term antigen (Ag)-specific T-cell protection against the virus, are characterized by distinct metabolic autophagy-dependent features in their T-cells compared to other people living with HIV-1 (PLWH). Despite durable viral control with antiretroviral therapy (ART), HIV-1-specific immune dysfunction does not normalize in non-controller PLWH. Therefore, the hypothesis of inducing autophagy to strengthen their Ag-specific T-cell immunity against HIV-1 starts to be an enticing concept. The aim of this review is to critically analyze promises and potential limitations of pharmacological and dietary interventions to activate autophagy in an attempt to rescue Ag-specific T-cell protection among PLWH.
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Affiliation(s)
- Nazanin Ghahari
- Institut National de la Recherche Scientifique (INRS), Centre Armand-Frappier Santé Biotechnologie, 531 Boulevard des Prairies, Laval, QC H7V 1M7, Canada
| | - Roman Telittchenko
- Institut National de la Recherche Scientifique (INRS), Centre Armand-Frappier Santé Biotechnologie, 531 Boulevard des Prairies, Laval, QC H7V 1M7, Canada
| | - Hamza Loucif
- EVAH Corp., 500 Boulevard Cartier Ouest, Laval, QC H7V 5B7, Canada
| | - Stephane Isnard
- Chronic Viral Illness Service and Division of Hematology, McGill University Health Centre, Glen Site, Montreal, QC H4A 3J1, Canada
| | - Jean-Pierre Routy
- Chronic Viral Illness Service and Division of Hematology, McGill University Health Centre, Glen Site, Montreal, QC H4A 3J1, Canada
| | - David Olagnier
- Department of Biomedicine, Research Center for Innate Immunology, Aarhus University, 8000 Aarhus, Denmark
| | - Julien van Grevenynghe
- Institut National de la Recherche Scientifique (INRS), Centre Armand-Frappier Santé Biotechnologie, 531 Boulevard des Prairies, Laval, QC H7V 1M7, Canada
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