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Abstract
INTRODUCTION Autophagy is a cellular stress response that plays key roles in physiological processes, such as adaptation to starvation, degradation of aberrant proteins or organelles, anti-microbial defense, protein secretion, and innate and adaptive immunity. Dysfunctional autophagy is recognized as a contributing factor in many chronic inflammatory diseases, including inflammatory bowel disease (IBD). Genetic studies have identified multiple IBD-associated risk loci that include genes required for autophagy, and several lines of evidence demonstrate that autophagy is impaired in IBD patients. How dysfunctional autophagy contributes to IBD onset is currently under investigation by researchers. KEY MESSAGES Dysfunctional autophagy has been identified to play a role in IBD pathogenesis by altering processes that include (1) intracellular bacterial killing, (2) anti-microbial peptide secretion by Paneth cells, (3) pro-inflammatory cytokine production by macrophages, (4) antigen presentation by dendritic cells, (5) goblet cell function, and (6) the endoplasmic reticulum stress response in enterocytes. The overall effect of dysregulation of these processes varies by cell type, stimulus, as well as cellular context. Manipulation of the autophagic pathway may provide a new avenue in the search for effective therapies for IBD. CONCLUSION Autophagy plays multiple roles in IBD pathogenesis. A better understanding of the role of autophagy in IBD patients may provide better subclassification of IBD phenotypes and novel approaches to disease management.
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Affiliation(s)
- Faris El-Khider
- Department of Gastroenterology & Hepatology, Digestive Disease Institute, Cleveland Clinic,Department of Pathobiology, Lerner Research Institute, Cleveland Clinic
| | - Christine McDonald
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic,Corresponding author: Christine McDonald, Department of Pathobiology, Lerner Research Institute, NC22, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, Ohio, 44195, USA, Phone: (216) 445-7058,
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152
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Maiuri MC, De Stefano D. Pathophysiologic Role of Autophagy in Human Airways. AUTOPHAGY NETWORKS IN INFLAMMATION 2016. [PMCID: PMC7123327 DOI: 10.1007/978-3-319-30079-5_16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Lung diseases are among the most common and widespread disorders worldwide. They refer to many different pathological conditions affecting the pulmonary system in acute or chronic forms, such as asthma, chronic obstructive pulmonary disease, infections, cystic fibrosis, lung cancer and many other breath complications. Environmental, epigenetic and genetic co-factors are responsible for these pathologies that can lead to respiratory failure, and, even, ultimately death. Increasing evidences have highlighted the implication of the autophagic pathways in the pathogenesis of lung diseases and, in some cases, the deregulated molecular mechanisms underlying autophagy may be considered as potential new therapeutic targets. This chapter summarizes recent advances in understanding the pathophysiological functions of autophagy and its possible roles in the causation and/or prevention of human lung diseases.
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153
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Kiriyama Y, Nochi H. D-Amino Acids in the Nervous and Endocrine Systems. SCIENTIFICA 2016; 2016:6494621. [PMID: 28053803 PMCID: PMC5178360 DOI: 10.1155/2016/6494621] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 11/14/2016] [Indexed: 05/12/2023]
Abstract
Amino acids are important components for peptides and proteins and act as signal transmitters. Only L-amino acids have been considered necessary in mammals, including humans. However, diverse D-amino acids, such as D-serine, D-aspartate, D-alanine, and D-cysteine, are found in mammals. Physiological roles of these D-amino acids not only in the nervous system but also in the endocrine system are being gradually revealed. N-Methyl-D-aspartate (NMDA) receptors are associated with learning and memory. D-Serine, D-aspartate, and D-alanine can all bind to NMDA receptors. H2S generated from D-cysteine reduces disulfide bonds in receptors and potentiates their activity. Aberrant receptor activity is related to diseases of the central nervous system (CNS), such as Alzheimer's disease, amyotrophic lateral sclerosis, and schizophrenia. Furthermore, D-amino acids are detected in parts of the endocrine system, such as the pineal gland, hypothalamus, pituitary gland, pancreas, adrenal gland, and testis. D-Aspartate is being investigated for the regulation of hormone release from various endocrine organs. Here we focused on recent findings regarding the synthesis and physiological functions of D-amino acids in the nervous and endocrine systems.
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Affiliation(s)
- Yoshimitsu Kiriyama
- Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University, Shido 1314-1, Sanuki, Kagawa 769-2193, Japan
| | - Hiromi Nochi
- Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University, Shido 1314-1, Sanuki, Kagawa 769-2193, Japan
- *Hiromi Nochi:
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154
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Sica V, Maiuri MC, Kroemer G, Galluzzi L. Detection of Apoptotic Versus Autophagic Cell Death by Flow Cytometry. Methods Mol Biol 2016; 1419:1-16. [PMID: 27108427 DOI: 10.1007/978-1-4939-3581-9_1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Different modes of regulated cell death (RCD) can be initiated by distinct molecular machineries and their morphological manifestations can be difficult to discriminate. Moreover, cells responding to stress often activate an adaptive response centered around autophagy, and whether such a response is cytoprotective or cytotoxic cannot be predicted based on morphological parameters only. Molecular definitions are therefore important to understand various RCD subroutines from a mechanistic perspective. In vitro, various forms of RCD including apoptosis and autophagic cell death can be easily discriminated from each other with assays that involve chemical or pharmacological interventions targeting key components of either pathway. Here, we detail a straightforward method to discriminate apoptosis from autophagic cell death by flow cytometry, based on the broad-spectrum caspase inhibitor Z-VAD-fmk and the genetic inhibition of ATG5.
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Affiliation(s)
- Valentina Sica
- Gustave Roussy Cancer Campus, Villejuif, France
- Equipe 11 labellisée par la Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers, 15, rue de l'Ecole de Médecine, 75006, Paris, France
- INSERM, U1138, Paris, France
- Faculté de Medicine, Université Paris Saclay/Paris XI, Le Kremlin-Bicêtre, France
- Université Paris Descartes/Paris V, Sorbonne Paris Cité, Paris, France
| | - M Chiara Maiuri
- Gustave Roussy Cancer Campus, Villejuif, France
- Equipe 11 labellisée par la Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers, 15, rue de l'Ecole de Médecine, 75006, Paris, France
- INSERM, U1138, Paris, France
- Université Paris Descartes/Paris V, Sorbonne Paris Cité, Paris, France
- Université Pierre et Marie Curie/Paris VI, Paris, France
| | - Guido Kroemer
- Equipe 11 labellisée par la Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers, 15, rue de l'Ecole de Médecine, 75006, Paris, France.
- INSERM, U1138, Paris, France.
- Université Paris Descartes/Paris V, Sorbonne Paris Cité, Paris, France.
- Université Pierre et Marie Curie/Paris VI, Paris, France.
- Pôle de Biologie, Hôpital Européen Georges Pompidou AP-HP, Paris, France.
- Metabolomics and Cell Biology Platforms, Gustave Roussy Cancer Campus, Villejuif, France.
- Department of Women's and Children's Health, Karolinska University Hospital, Stockholm, Sweden.
| | - Lorenzo Galluzzi
- Gustave Roussy Cancer Campus, Villejuif, France.
- Equipe 11 labellisée par la Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers, 15, rue de l'Ecole de Médecine, 75006, Paris, France.
- INSERM, U1138, Paris, France.
- Université Paris Descartes/Paris V, Sorbonne Paris Cité, Paris, France.
- Université Pierre et Marie Curie/Paris VI, Paris, France.
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156
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Autophagy Mediates Tumor Suppression via Cellular Senescence. Trends Cell Biol 2015; 26:1-3. [PMID: 26612212 DOI: 10.1016/j.tcb.2015.11.001] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 11/06/2015] [Indexed: 01/10/2023]
Abstract
Autophagy not only constitutes a robust barrier against malignant transformation at the cell-intrinsic level, but also contributes to the organismal control of potentially oncogenic cells. Recent data provide molecular insights into the mechanisms whereby oncogene hyperactivation induces autophagy to establish a permanent proliferative arrest commonly known as cellular senescence.
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