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Kovács AL, Lőw P, Juhász G. The legacy of János Kovács: a lifelong devotion to advancing autophagy research. Autophagy 2022; 18:2017-2019. [PMID: 35737695 DOI: 10.1080/15548627.2022.2091263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Affiliation(s)
- Attila L Kovács
- Department of Anatomy, Cell and Developmental Biology, Eötvös Loránd University, Budapest, Hungary
| | - Péter Lőw
- Department of Anatomy, Cell and Developmental Biology, Eötvös Loránd University, Budapest, Hungary
| | - Gábor Juhász
- Department of Anatomy, Cell and Developmental Biology, Eötvös Loránd University, Budapest, Hungary.,Institute of Genetics, Biological Research Centre, Szeged, Hungary
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2
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Low P. Recent advances in autophagy research. Biol Futur 2022; 73:133-136. [DOI: 10.1007/s42977-022-00125-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Accepted: 06/08/2022] [Indexed: 10/17/2022]
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3
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Petruccelli E, Lark A, Mrkvicka JA, Kitamoto T. Significance of DopEcR, a G-protein coupled dopamine/ecdysteroid receptor, in physiological and behavioral response to stressors. J Neurogenet 2020; 34:55-68. [PMID: 31955616 PMCID: PMC7717672 DOI: 10.1080/01677063.2019.1710144] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Accepted: 12/25/2019] [Indexed: 12/18/2022]
Abstract
Organisms respond to various environmental stressors by modulating physiology and behavior to maintain homeostasis. Steroids and catecholamines are involved in the highly conserved signaling pathways crucial for mounting molecular and cellular events that ensure immediate or long-term survival under stress conditions. The insect dopamine/ecdysteroid receptor (DopEcR) is a dual G-protein coupled receptor for the catecholamine dopamine and the steroid hormone ecdysone. DopEcR acts in a ligand-dependent manner, mediating dopaminergic signaling and unconventional "nongenomic" ecdysteroid actions through various intracellular signaling pathways. This unique feature of DopEcR raises the interesting possibility that DopEcR may serve as an integrative hub for complex molecular cascades activated under stress conditions. Here, we review previously published studies of Drosophila DopEcR in the context of stress response and also present newly discovered DopEcR loss-of-function phenotypes under different stress conditions. These findings provide corroborating evidence that DopEcR plays vital roles in responses to various stressors, including heat, starvation, alcohol, courtship rejection, and repeated neuronal stimulation in Drosophila. We further discuss what is known about DopEcR in other insects and DopEcR orthologs in mammals, implicating their roles in stress responses. Overall, this review highlights the importance of dual GPCRs for catecholamines and steroids in modulating physiology and behavior under stress conditions. Further multidisciplinary studies of Drosophila DopEcR will contribute to our basic understanding of the functional roles and underlying mechanisms of this class of GPCRs.
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Affiliation(s)
- Emily Petruccelli
- Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsville, IL, USA
| | - Arianna Lark
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA, USA
| | - James A Mrkvicka
- Interdisciplinary Graduate Program in Genetics, University of Iowa, Iowa City, IA, USA
| | - Toshihiro Kitamoto
- Interdisciplinary Graduate Program in Genetics, University of Iowa, Iowa City, IA, USA
- Department of Anesthesia, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
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Ge L, Gu H, Huang B, Song Q, Stanley D, Liu F, Yang GQ, Wu JC. An adenylyl cyclase like-9 gene (NlAC9) influences growth and fecundity in the brown planthopper, Nilaparvata lugens (Stål) (Hemiptera: Delphacidae). PLoS One 2017; 12:e0189214. [PMID: 29236776 PMCID: PMC5728565 DOI: 10.1371/journal.pone.0189214] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 11/21/2017] [Indexed: 02/03/2023] Open
Abstract
The cAMP/PKA intracellular signaling pathway is launched by adenylyl cyclase (AC) conversion of adenosine triphosphate (ATP) to 3', 5'-cyclic AMP (cAMP) and cAMP-dependent activation of PKA. Although this pathway is very well known in insect physiology, there is little to no information on it in some very small pest insects, such as the brown planthopper (BPH), Nilaparvata lugens Stål. BPH is a destructive pest responsible for tremendous crop losses in rice cropping systems. We are investigating the potentials of novel pest management technologies from RNA interference perspective. Based on analysis of transcriptomic data, the BPH AC like-9 gene (NlAC9) was up-regulated in post-mating females, which led us to pose the hypothesis that NlAC9 is a target gene that would lead to reduced BPH fitness and populations. Targeting NlAC9 led to substantially decreased soluble ovarian protein content, yeast-like symbiont abundance, and vitellogenin gene expression, accompanied with stunted ovarian development and body size. Eggs laid were decreased and oviposition period shortened. Taken together, our findings indicated that NlAC9 exerted pronounced effects on female fecundity, growth and longevity, which strongly supports our hypothesis.
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Affiliation(s)
- LinQuan Ge
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou P.R. China
| | - HaoTian Gu
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou P.R. China
| | - Bo Huang
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou P.R. China
| | - Qisheng Song
- Division of Plant Sciences, University of Missouri, Columbia, MO, United States of America
| | - David Stanley
- USDA/Agricultural Research Service, Biological Control of Insects Research Laboratory, Columbia, Missouri, United States of America
| | - Fang Liu
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou P.R. China
| | - Guo-Qing Yang
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou P.R. China
| | - Jin-Cai Wu
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou P.R. China
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Vafopoulou X, Steel CGH. Mitochondria and the insect steroid hormone receptor (EcR): A complex relationship. Gen Comp Endocrinol 2016; 237:68-77. [PMID: 27497706 DOI: 10.1016/j.ygcen.2016.08.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 07/28/2016] [Accepted: 08/02/2016] [Indexed: 11/23/2022]
Abstract
The actions of the insect steroid molting hormones, ecdysteroids, on the genome of target cells has been well studied, but little is known of their extranuclear actions. We previously showed in Rhodnius prolixus that much of the ecdysteroid receptor (EcR) resides in the cytoplasm of various cell types and undergoes shuttling between nucleus and cytoplasm with circadian periodicity, possibly using microtubules as tracks for translocation to the nucleus. Here we report that cytoplasmic EcR appears to be also involved in extranuclear actions of ecdysteroids by association with the mitochondria. Western blots of subcellular fractions of brain lysates revealed that EcR is localized in the mitochondrial fraction, indicating an intimate association of EcR with mitochondria. Confocal laser microscopy and immunohistochemistry using anti-EcR revealed abundant co-localization of EcR with mitochondria in brain neurons and their axons, especially intense in the subplasmalemmal region, raising the possibility of EcR involvement in mitochondrial functions in subplasmalemmal microdomains. When mitochondria are dispersed by disruption of microtubules with colchicine, EcR remains associated with mitochondria showing strong receptor association with mitochondria. Treatment in vitro with ecdysteroids of brains of developmentally arrested R. prolixus (containing neither ecdysteroids nor EcR) induces EcR and abundant co-localization with mitochondria in neurons, concurrently with a sharp increase of the mitochondrial protein COX 1, suggesting involvement of EcR in mitochondrial function. These findings align EcR with various vertebrate steroid receptors, where actions of steroid receptors on mitochondria are widely known and suggest that steroid receptors across distant phyla share similar functional attributes.
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Affiliation(s)
| | - Colin G H Steel
- Biology Department, York University, Toronto, Ontario, Canada
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Banreti A, Hudry B, Sass M, Saurin AJ, Graba Y. Hox proteins mediate developmental and environmental control of autophagy. Dev Cell 2014; 28:56-69. [PMID: 24389064 DOI: 10.1016/j.devcel.2013.11.024] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2013] [Revised: 09/06/2013] [Accepted: 11/27/2013] [Indexed: 11/16/2022]
Abstract
Hox genes encode evolutionarily conserved transcription factors, providing positional information used for differential morphogenesis along the anteroposterior axis. Here, we show that Drosophila Hox proteins are potent repressors of the autophagic process. In inhibiting autophagy, Hox proteins display no apparent paralog specificity and do not provide positional information. Instead, they impose temporality on developmental autophagy and act as effectors of environmental signals in starvation-induced autophagy. Further characterization establishes that temporality is controlled by Pontin, a facultative component of the Brahma chromatin remodeling complex, and that Hox proteins impact on autophagy by repressing the expression of core components of the autophagy machinery. Finally, the potential of central and posterior mouse Hox proteins to inhibit autophagy in Drosophila and in vertebrate COS-7 cells indicates that regulation of autophagy is an evolutionary conserved feature of Hox proteins.
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Affiliation(s)
- Agnes Banreti
- CNRS, Aix Marseille Université, IBDML, UMR 7288, Campus de Luminy, Marseille, cedex 09, 13288, France; Department of Anatomy, Cell and Developmental Biology, Eötvös Loránd University, Budapest, 1117, Hungary.
| | - Bruno Hudry
- CNRS, Aix Marseille Université, IBDML, UMR 7288, Campus de Luminy, Marseille, cedex 09, 13288, France
| | - Miklos Sass
- Department of Anatomy, Cell and Developmental Biology, Eötvös Loránd University, Budapest, 1117, Hungary
| | - Andrew J Saurin
- CNRS, Aix Marseille Université, IBDML, UMR 7288, Campus de Luminy, Marseille, cedex 09, 13288, France
| | - Yacine Graba
- CNRS, Aix Marseille Université, IBDML, UMR 7288, Campus de Luminy, Marseille, cedex 09, 13288, France.
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Elmogy M, Terashima J, Iga M, Iwami M, Sakurai S. A rapid increase in cAMP in response to 20-hydroxyecdysone in the anterior silk glands of the silkworm, Bombyx mori. Zoolog Sci 2007; 23:715-9. [PMID: 16971790 DOI: 10.2108/zsj.23.715] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In the anterior silk glands (ASGs) of the silkworm, Bombyx mori, intracellular cAMP increases transiently to a very high level shortly after the hemolymph ecdysteroid peak in the prepupal period. In cultured ASGs obtained on the day of gut-purge, cAMP levels were increased by 20-hydroxyecdysone (20E), and this increase was enhanced by an inhibitor of phosphodiesterase, but was not affected by alpha-amanitin, indicating the 20E action may not be mediated via gene expression. The increase in cAMP occurred within 30 seconds of exposure to a physiological concentration of 20E (1 microM), and also by ponasterone A. Our findings indicate a nongenomic action of ecdysteroids in insects, which may be an additional mechanism by which this steroid hormone induces acute responses in tissues and cells.
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Affiliation(s)
- Mohamed Elmogy
- Division of Life Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Japan
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Elmogy M, Iwami M, Sakurai S. Presence of membrane ecdysone receptor in the anterior silk gland of the silkworm Bombyx mori. ACTA ACUST UNITED AC 2004; 271:3171-9. [PMID: 15265036 DOI: 10.1111/j.1432-1033.2004.04249.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nongenomic action of an insect steroid hormone, 20-hydroxyecdysone (20E), has been implicated in several 20E-dependent events including the programmed cell death of Bombyx anterior silk glands (ASGs), but no information is available for the mode of the action. We provide evidence for a putative membrane receptor located in the plasma membrane of the ASGs. Membrane fractions prepared from the ASGs exhibit high binding activity to [3H]ponasterone A (PonA). The membrane fractions did not contain conventional ecdysone receptor as revealed by Western blot analysis using antibody raised against Bombyx ecdysone receptor A (EcR-A). The binding activity was not solubilized with 1 m NaCl or 0.05% (w/v) MEGA-8, indicating that the binding sites were localized in the membrane. Differential solubilization and temperature-induced phase separation in Triton X-114 showed that the binding sites might be integrated membrane proteins. These results indicated that the binding sites are located in plasma membrane proteins, which we putatively referred to as membrane ecdysone receptor (mEcR). The mEcR exhibited saturable binding for [3H]PonA (Kd = 17.3 nm, Bmax = 0.82 pmol.mg(-1) protein). Association and dissociation kinetics revealed that [3H]PonA associated with and dissociated from mEcR within minutes. The combined results support the existence of a plasmalemmal ecdysteroid receptor, which may act in concert with the conventional EcR in various 20E-dependent developmental events.
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Affiliation(s)
- Mohamed Elmogy
- Division of Life Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakumamachi, Japan
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20-Hydroxyecdysone induced phosphorylation of fat body proteins in Mamestra brassicae. ACTA ACUST UNITED AC 1988. [DOI: 10.1016/0020-1790(88)90015-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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