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Grinberg M, Nemtsova Y, Ageyeva M, Brilkina A, Vodeneev V. Effect of low-dose ionizing radiation on spatiotemporal parameters of functional responses induced by electrical signals in tobacco plants. Photosynth Res 2023; 157:119-132. [PMID: 37210467 DOI: 10.1007/s11120-023-01027-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Accepted: 05/10/2023] [Indexed: 05/22/2023]
Abstract
Plants growing under an increased radiation background may be exposed to additional stressors. Plant acclimatization is formed with the participation of stress signals that cause systemic responses-a change in the activity of physiological processes. In this work, we studied the mechanisms of the effect of ionizing radiation (IR) on the systemic functional responses induced by electrical signals. Chronic β-irradiation (31.3 μGy/h) have a positive effect on the morphometric parameters and photosynthetic activity of tobacco plants (Nicotiana tabacum L.) at rest. An additional stressor causes an electrical signal, which, when propagated, causes a temporary change in chlorophyll fluorescence parameters, reflecting a decrease in photosynthesis activity. Irradiation did not significantly affect the electrical signals. At the same time, more pronounced photosynthesis responses are observed in irradiated plants: both the amplitude and the leaf area covered by the reaction increase. The formation of such responses is associated with changes in pH and stomatal conductance, the role of which was analyzed under IR. Using tobacco plants expressing the fluorescent pH-sensitive protein Pt-GFP, it was shown that IR enhances signal-induced cytoplasmic acidification. It was noted that irradiation also disrupts the correlation between the amplitudes of the electrical signal, pH shifts, changes in chlorophyll fluorescence parameters. Also stronger inhibition of stomatal conductance by the signal was shown in irradiated plants. It was concluded that the effect of IR on the systemic response induced by the electrical signal is mainly due to its effect on the stage of signal transformation into the response.
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Affiliation(s)
- Marina Grinberg
- Lobachevsky State University of Nizhny Novgorod, Gagarin St. 23, Nizhny Novgorod, 603950, Russia
| | - Yuliya Nemtsova
- Lobachevsky State University of Nizhny Novgorod, Gagarin St. 23, Nizhny Novgorod, 603950, Russia
| | - Maria Ageyeva
- Lobachevsky State University of Nizhny Novgorod, Gagarin St. 23, Nizhny Novgorod, 603950, Russia
| | - Anna Brilkina
- Lobachevsky State University of Nizhny Novgorod, Gagarin St. 23, Nizhny Novgorod, 603950, Russia
| | - Vladimir Vodeneev
- Lobachevsky State University of Nizhny Novgorod, Gagarin St. 23, Nizhny Novgorod, 603950, Russia.
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2
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Sleat DE, Banach-Petrosky W, Larrimore KE, Nemtsova Y, Wiseman JA, Najafi A, Johnson D, Poole TA, Takahashi K, Cooper JD, Lobel P. A mouse mutant deficient in both neuronal ceroid lipofuscinosis-associated proteins CLN3 and TPP1. J Inherit Metab Dis 2023. [PMID: 37078466 DOI: 10.1002/jimd.12619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 04/11/2023] [Accepted: 04/17/2023] [Indexed: 04/21/2023]
Abstract
Late-infantile neuronal ceroid lipofuscinosis (LINCL) and juvenile neuronal ceroid lipofuscinosis (JNCL) are inherited neurodegenerative diseases caused by mutations in the genes encoding lysosomal proteins tripeptidyl peptidase 1 (TPP1) and CLN3 protein, respectively. TPP1 is well-understood and, aided by animal models that accurately recapitulate the human disease, enzyme replacement therapy has been approved and other promising therapies are emerging. In contrast, there are no effective treatments for JNCL, partly because the function of the CLN3 protein remains unknown but also because animal models have attenuated disease and lack robust survival phenotypes. Mouse models for LINCL and JNCL, with mutations in Tpp1 and Cln3 respectively, have been thoroughly characterized but the phenotype of a double Cln3/Tpp1 mutant remains unknown. We created this double mutant and find that its phenotype is essentially indistinguishable from the single Tpp1-/- mutant in terms of survival and brain pathology. Analysis of brain proteomic changes in the single Tpp1-/- and double Cln3-/- ;Tpp1-/- mutants indicates largely overlapping sets of altered proteins and reinforces earlier studies that highlight GPNMB, LYZ2 and SERPINA3 as promising biomarker candidates in LINCL while several lysosomal proteins including SMPD1 and NPC1 appear to be altered in the Cln3-/- animals. An unexpected finding was that Tpp1 heterozygosity significantly decreased lifespan of the Cln3-/- mouse. The truncated survival of this mouse model makes it potentially useful in developing therapies for JNCL using survival as an endpoint. In addition, this model may also provide insights into CLN3 protein function and its potential functional interactions with TPP1. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- David E Sleat
- Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, NJ, United States of America
- Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School, Rutgers Biomedical Health Sciences, Rutgers University, Piscataway, NJ, United States of America
| | - Whitney Banach-Petrosky
- Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, NJ, United States of America
| | - Katherine E Larrimore
- Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, NJ, United States of America
| | - Yuliya Nemtsova
- Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, NJ, United States of America
| | - Jennifer A Wiseman
- Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, NJ, United States of America
| | - Allison Najafi
- The Lundquist Institute (formerly Los Angeles Biomedical Research Institute), Harbor-UCLA Medical Center, and David Geffen School of Medicine, University of California, Los Angeles, Torrance, CA, United States of America
| | | | | | | | - Jonathan D Cooper
- The Lundquist Institute (formerly Los Angeles Biomedical Research Institute), Harbor-UCLA Medical Center, and David Geffen School of Medicine, University of California, Los Angeles, Torrance, CA, United States of America
- Departments of Pediatrics
- Genetics
- Neurology, Division of Genetics and Genomic Medicine, Washington University in St Louis, School of Medicine, St Louis, MO, United States of America
| | - Peter Lobel
- Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, NJ, United States of America
- Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School, Rutgers Biomedical Health Sciences, Rutgers University, Piscataway, NJ, United States of America
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3
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Nemtsova Y, Steinert BL, Wharton KA. Compartment specific mitochondrial dysfunction in Drosophila knock-in model of ALS reversed by altered gene expression of OXPHOS subunits and pro-fission factor Drp1. Mol Cell Neurosci 2023; 125:103834. [PMID: 36868541 DOI: 10.1016/j.mcn.2023.103834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 02/20/2023] [Accepted: 02/23/2023] [Indexed: 03/05/2023] Open
Abstract
Amyotrophic Lateral Sclerosis (ALS) is a fatal multisystem neurodegenerative disease, characterized by a loss in motor function. ALS is genetically diverse, with mutations in genes ranging from those regulating RNA metabolism, like TAR DNA-binding protein (TDP-43) and Fused in sarcoma (FUS), to those that act to maintain cellular redox homeostasis, like superoxide dismutase 1 (SOD1). Although varied in genetic origin, pathogenic and clinical commonalities are clearly evident between cases of ALS. Defects in mitochondria is one such common pathology, thought to occur prior to, rather than as a consequence of symptom onset, making these organelles a promising therapeutic target for ALS, as well as other neurodegenerative diseases. Depending on the homeostatic needs of neurons throughout life, mitochondria are normally shuttled to different subcellular compartments to regulate metabolite and energy production, lipid metabolism, and buffer calcium. While originally considered a motor neuron disease due to the dramatic loss in motor function accompanied by motor neuron cell death in ALS patients, many studies have now implicated non-motor neurons and glial cells alike. Defects in non-motor neuron cell types often preceed motor neuron death suggesting their dysfunction may initiate and/or facilitate the decline in motor neuron health. Here, we investigate mitochondria in a Drosophila Sod1 knock-in model of ALS. In depth, in vivo, examination reveals mitochondrial dysfunction evident prior to onset of motor neuron degeneration. Genetically encoded redox biosensors identify a general disruption in the electron transport chain (ETC). Compartment specific abnormalities in mitochondrial morphology is observed in diseased sensory neurons, accompanied by no apparent defects in the axonal transport machinery, but instead an increase in mitophagy in synaptic regions. The decrease in networked mitochondria at the synapse is reversed upon downregulation of the pro-fission factor Drp1. Furthermore, altered expression of specific OXPHOS subunits reverses ALS-associated defects in mitochondrial morphology and function.
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Affiliation(s)
- Y Nemtsova
- Molecular Biology, Cell Biology, and Biochemistry Department, Brown University, Providence, RI 02912, United States.
| | - B L Steinert
- Molecular Biology, Cell Biology, and Biochemistry Department, Brown University, Providence, RI 02912, United States.
| | - K A Wharton
- Molecular Biology, Cell Biology, and Biochemistry Department, Brown University, Providence, RI 02912, United States; Robert J. and Nancy D. Carney Institute for Brain Science, Brown University, Providence, RI 02912, United States.
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Collier AM, Nemtsova Y, Kuber N, Banach-Petrosky W, Modak A, Sleat DE, Nanda V, Lobel P. Lysosomal protein thermal stability does not correlate with cellular half-life: global observations and a case study of tripeptidyl-peptidase 1. Biochem J 2020; 477:727-745. [PMID: 31957806 PMCID: PMC8442665 DOI: 10.1042/bcj20190874] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 01/15/2020] [Accepted: 01/20/2020] [Indexed: 12/16/2022]
Abstract
Late-infantile neuronal ceroid lipofuscinosis (LINCL) is a neurodegenerative lysosomal storage disorder caused by mutations in the gene encoding the protease tripeptidyl-peptidase 1 (TPP1). Progression of LINCL can be slowed or halted by enzyme replacement therapy, where recombinant human TPP1 is administered to patients. In this study, we utilized protein engineering techniques to increase the stability of recombinant TPP1 with the rationale that this may lengthen its lysosomal half-life, potentially increasing the potency of the therapeutic protein. Utilizing multiple structure-based methods that have been shown to increase the stability of other proteins, we have generated and evaluated over 70 TPP1 variants. The most effective mutation, R465G, increased the melting temperature of TPP1 from 55.6°C to 64.4°C and increased its enzymatic half-life at 60°C from 5.4 min to 21.9 min. However, the intracellular half-life of R465G and all other variants tested in cultured LINCL patient-derived lymphoblasts was similar to that of WT TPP1. These results provide structure/function insights into TPP1 and indicate that improving in vitro thermal stability alone is insufficient to generate TPP1 variants with improved physiological stability. This conclusion is supported by a proteome-wide analysis that indicates that lysosomal proteins have higher melting temperatures but also higher turnover rates than proteins of other organelles. These results have implications for similar efforts where protein engineering approaches, which are frequently evaluated in vitro, may be considered for improving the physiological properties of proteins, particularly those that function in the lysosomal environment.
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Affiliation(s)
- Aaron M. Collier
- Center for Advanced Biotechnology and Medicine, Rutgers
University, Piscataway, NJ 08854
| | - Yuliya Nemtsova
- Center for Advanced Biotechnology and Medicine, Rutgers
University, Piscataway, NJ 08854
| | - Narendra Kuber
- Center for Advanced Biotechnology and Medicine, Rutgers
University, Piscataway, NJ 08854
| | | | - Anurag Modak
- Center for Advanced Biotechnology and Medicine, Rutgers
University, Piscataway, NJ 08854
| | - David E. Sleat
- Center for Advanced Biotechnology and Medicine, Rutgers
University, Piscataway, NJ 08854
- Department of Biochemistry and Molecular Biology, Rutgers
University, Piscataway, NJ 08854
| | - Vikas Nanda
- Center for Advanced Biotechnology and Medicine, Rutgers
University, Piscataway, NJ 08854
- Department of Biochemistry and Molecular Biology, Rutgers
University, Piscataway, NJ 08854
| | - Peter Lobel
- Center for Advanced Biotechnology and Medicine, Rutgers
University, Piscataway, NJ 08854
- Department of Biochemistry and Molecular Biology, Rutgers
University, Piscataway, NJ 08854
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5
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Audesse AJ, Dhakal S, Hassell LA, Gardell Z, Nemtsova Y, Webb AE. FOXO3 directly regulates an autophagy network to functionally regulate proteostasis in adult neural stem cells. PLoS Genet 2019; 15:e1008097. [PMID: 30973875 PMCID: PMC6478346 DOI: 10.1371/journal.pgen.1008097] [Citation(s) in RCA: 96] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 04/23/2019] [Accepted: 03/18/2019] [Indexed: 12/20/2022] Open
Abstract
Maintenance of a healthy proteome is essential for cellular homeostasis and loss of proteostasis is associated with tissue dysfunction and neurodegenerative disease. The mechanisms that support proteostasis in healthy cells and how they become defective during aging or in disease states are not fully understood. Here, we investigate the transcriptional programs that are essential for neural stem and progenitor cell (NSPC) function and uncover a program of autophagy genes under the control of the transcription factor FOXO3. Using genomic approaches, we observe that FOXO3 directly binds a network of target genes in adult NSPCs that are involved in autophagy, and find that FOXO3 functionally regulates induction of autophagy in these cells. Interestingly, in the absence of FOXO activity, aggregates accumulate in NSPCs, and this effect is reversed by TOR (target of rapamycin) inhibition. Surprisingly, enhancing FOXO3 causes nucleation of protein aggregates, but does not increase their degradation. The work presented here identifies a genomic network under the direct control of a key transcriptional regulator of aging that is critical for maintaining a healthy mammalian stem cell pool to support lifelong neurogenesis.
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Affiliation(s)
- Amanda J. Audesse
- Neuroscience Graduate Program, Brown University, Providence, Rhode Island, United States of America
| | - Shleshma Dhakal
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, Rhode Island, United States of America
| | - Lexi-Amber Hassell
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, Rhode Island, United States of America
| | - Zachary Gardell
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, Rhode Island, United States of America
| | - Yuliya Nemtsova
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, Rhode Island, United States of America
| | - Ashley E. Webb
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, Rhode Island, United States of America
- Center on the Biology of Aging, Brown University, Providence, Rhode Island, United States of America
- Carney Institute for Brain Science, Brown University, Providence, Rhode Island, United States of America
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6
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Meng Y, Wiseman JA, Nemtsova Y, Moore DF, Guevarra J, Reuhl K, Banks WA, Daneman R, Sleat DE, Lobel P. A Basic ApoE-Based Peptide Mediator to Deliver Proteins across the Blood-Brain Barrier: Long-Term Efficacy, Toxicity, and Mechanism. Mol Ther 2017; 25:1531-1543. [PMID: 28456380 DOI: 10.1016/j.ymthe.2017.03.037] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 03/28/2017] [Accepted: 03/29/2017] [Indexed: 11/26/2022] Open
Abstract
We have investigated delivery of protein therapeutics from the bloodstream into the brain using a mouse model of late-infantile neuronal ceroid lipofuscinosis (LINCL), a lysosomal disease due to deficiencies in tripeptidyl peptidase 1 (TPP1). Supraphysiological levels of TPP1 are delivered to the mouse brain by acute intravenous injection when co-administered with K16ApoE, a peptide that in trans mediates passage across the blood-brain barrier (BBB). Chronic treatment of LINCL mice with TPP1 and K16ApoE extended the lifespan from 126 to >294 days, diminished pathology, and slowed locomotor dysfunction. K16ApoE enhanced uptake of a fixable biotin tracer by brain endothelial cells in a dose-dependent manner, suggesting that its mechanism involves stimulation of endocytosis. Pharmacokinetic experiments indicated that K16ApoE functions without disrupting the BBB, with minimal effects on overall clearance or uptake by the liver and kidney. K16ApoE has a narrow therapeutic index, with toxicity manifested as lethargy and/or death in mice. To address this, we evaluated variant peptides but found that efficacy and toxicity are associated, suggesting that desired and adverse effects are mechanistically related. Toxicity currently precludes direct clinical application of peptide-mediated delivery in its present form but it remains a useful approach to proof-of-principle studies for biologic therapies to the brain in animal models.
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Affiliation(s)
- Yu Meng
- Center for Advanced Biotechnology and Medicine, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA; Wenzhou-Kean University, Wenzhou, Zhejiang 32050, China
| | - Jennifer A Wiseman
- Center for Advanced Biotechnology and Medicine, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
| | - Yuliya Nemtsova
- Center for Advanced Biotechnology and Medicine, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
| | - Dirk F Moore
- Department of Biostatistics, School of Public Health, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
| | - Jenieve Guevarra
- Department of Pharmacology, Physiology, and Neuroscience, Rutgers New Jersey Medical School, Newark, NJ 07103, USA
| | - Kenneth Reuhl
- Department of Pharmacology and Toxicology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
| | - William A Banks
- Geriatrics Research Education and Clinical Center, Department of Medicine, Veterans Affairs Puget Sound Health Care System, Seattle, WA 98108, USA; Division of Gerontology and Geriatric Medicine, University of Washington School of Medicine, Seattle, WA 98108, USA
| | - Richard Daneman
- Departments of Pharmacology and Neuroscience, University of California, San Diego, CA 92093, USA
| | - David E Sleat
- Center for Advanced Biotechnology and Medicine, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA; Department of Biochemistry and Molecular Biology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA.
| | - Peter Lobel
- Center for Advanced Biotechnology and Medicine, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA; Department of Biochemistry and Molecular Biology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA.
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7
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Wiseman JA, Meng Y, Nemtsova Y, Matteson PG, Millonig JH, Moore DF, Sleat DE, Lobel P. Chronic Enzyme Replacement to the Brain of a Late Infantile Neuronal Ceroid Lipofuscinosis Mouse Has Differential Effects on Phenotypes of Disease. Mol Ther Methods Clin Dev 2017; 4:204-212. [PMID: 28345005 PMCID: PMC5363315 DOI: 10.1016/j.omtm.2017.01.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 01/23/2017] [Indexed: 12/12/2022]
Abstract
Late infantile neuronal ceroid lipofuscinosis (LINCL) is a fatal inherited neurodegenerative disease caused by loss of lysosomal protease tripeptidyl peptidase 1 (TPP1). We have investigated the effects of chronic intrathecal (IT) administration using enzyme replacement therapy (ERT) to the brain of an LINCL mouse model, in which locomotor function declines dramatically prior to early death. Median lifespan was significantly extended from 126 days to >259 days when chronic IT treatment was initiated before the onset of disease. While treated animals lived longer and showed little sign of locomotor dysfunction as measured by stride length, some or all (depending on regimen) still died prematurely. One explanation is that cerebrospinal fluid (CSF)-mediated delivery may not deliver TPP1 to all brain regions. Morphological studies support this, showing delivery of TPP1 to ventral, but not deeper and dorsal regions. When IT treatment is initiated in severely affected LINCL mice, lifespan was extended modestly in most but dramatically extended in approximately one-third of the cohort. Treatment improved locomotor function in these severely compromised animals after it had declined to the point at which animals normally die. This indicates that some pathology in LINCL is reversible and does not simply reflect neuronal death.
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Affiliation(s)
- Jennifer A Wiseman
- Center for Advanced Biotechnology and Medicine, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
| | - Yu Meng
- Center for Advanced Biotechnology and Medicine, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
| | - Yuliya Nemtsova
- Center for Advanced Biotechnology and Medicine, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
| | - Paul G Matteson
- Center for Advanced Biotechnology and Medicine, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
| | - James H Millonig
- Center for Advanced Biotechnology and Medicine, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA; Department of Neuroscience & Cell Biology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
| | - Dirk F Moore
- School of Public Health, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
| | - David E Sleat
- Center for Advanced Biotechnology and Medicine, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA; Department of Biochemistry and Molecular Biology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
| | - Peter Lobel
- Center for Advanced Biotechnology and Medicine, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA; Department of Biochemistry and Molecular Biology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
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