1
|
Karunungan K, Garza RH, Grodzki AC, Holt M, Lein PJ, Chandrasekaran V. Gamma secretase activity modulates BMP-7-induced dendritic growth in primary rat sympathetic neurons. Auton Neurosci 2023; 247:103085. [PMID: 37031474 DOI: 10.1016/j.autneu.2023.103085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 03/28/2023] [Accepted: 03/29/2023] [Indexed: 04/08/2023]
Abstract
Autonomic dysfunction has been observed in Alzheimer's disease (AD); however, the effects of genes involved in AD on the peripheral nervous system are not well understood. Previous studies have shown that presenilin-1 (PSEN1), the catalytic subunit of the gamma secretase (γ-secretase) complex, mutations in which are associated with familial AD function, regulates dendritic growth in hippocampal neurons. In this study, we examined whether the γ-secretase pathway also influences dendritic growth in primary sympathetic neurons. Using immunoblotting and immunocytochemistry, molecules of the γ-secretase complex, PSEN1, PSEN2, PEN2, nicastrin and APH1a, were detected in sympathetic neurons dissociated from embryonic (E20/21) rat sympathetic ganglia. Addition of bone morphogenetic protein-7 (BMP-7), which induces dendrites in these neurons, did not alter expression or localization of γ-secretase complex proteins. BMP-7-induced dendritic growth was inhibited by siRNA knockdown of PSEN1 and by three γ-secretase inhibitors, γ-secretase inhibitor IX (DAPT), LY-411575 and BMS-299897. These effects were specific to dendrites and concentration-dependent and did not alter early downstream pathways of BMP signaling. In summary, our results indicate that γ-secretase activity enhances BMP-7 induced dendritic growth in sympathetic neurons. These findings provide insight into the normal cellular role of the γ-secretase complex in sympathetic neurons.
Collapse
|
2
|
Sainero-Alcolado L, Mushtaq M, Liaño-Pons J, Rodriguez-Garcia A, Yuan Y, Liu T, Ruiz-Pérez MV, Schlisio S, Bedoya-Reina O, Arsenian-Henriksson M. Expression and activation of nuclear hormone receptors result in neuronal differentiation and favorable prognosis in neuroblastoma. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2022; 41:226. [PMID: 35850708 PMCID: PMC9295514 DOI: 10.1186/s13046-022-02399-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 05/19/2022] [Indexed: 01/20/2023]
Abstract
BACKGROUND Neuroblastoma (NB), a childhood tumor derived from the sympathetic nervous system, presents with heterogeneous clinical behavior. While some tumors regress spontaneously without medical intervention, others are resistant to therapy, associated with an aggressive phenotype. MYCN-amplification, frequently occurring in high-risk NB, is correlated with an undifferentiated phenotype and poor prognosis. Differentiation induction has been proposed as a therapeutic approach for high-risk NB. We have previously shown that MYCN maintains an undifferentiated state via regulation of the miR-17 ~ 92 microRNA cluster, repressing the nuclear hormone receptors (NHRs) estrogen receptor alpha (ERα) and the glucocorticoid receptor (GR). METHODS Cell viability was determined by WST-1. Expression of differentiation markers was analyzed by Western blot, RT-qPCR, and immunofluorescence analysis. Metabolic phenotypes were studied using Agilent Extracellular Flux Analyzer, and accumulation of lipid droplets by Nile Red staining. Expression of angiogenesis, proliferation, and neuronal differentiation markers, and tumor sections were assessed by immunohistochemistry. Gene expression from NB patient as well as adrenal gland cohorts were analyzed using GraphPad Prism software (v.8) and GSEA (v4.0.3), while pseudo-time progression on post-natal adrenal gland cells from single-nuclei transcriptome data was computed using scVelo. RESULTS Here, we show that simultaneous activation of GR and ERα potentiated induction of neuronal differentiation, reduced NB cell viability in vitro, and decreased tumor burden in vivo. This was accompanied by a metabolic reprogramming manifested by changes in the glycolytic and mitochondrial functions and in lipid droplet accumulation. Activation of the retinoic acid receptor alpha (RARα) with all-trans retinoic acid (ATRA) further enhanced the differentiated phenotype as well as the metabolic switch. Single-cell nuclei transcriptome analysis of human adrenal glands indicated a sequential expression of ERα, GR, and RARα during development from progenitor to differentiated chromaffin cells. Further, in silico analysis revealed that patients with higher combined expression of GR, ERα, and RARα mRNA levels had elevated expression of neuronal differentiation markers and a favorable outcome. CONCLUSION Together, our findings suggest that combination therapy involving activation of several NHRs could be a promising pharmacological approach for differentiation treatment of NB patients.
Collapse
Affiliation(s)
- Lourdes Sainero-Alcolado
- grid.4714.60000 0004 1937 0626Department of Microbiology, Tumor and Cell Biology (MTC), Karolinska Institutet, SE-171 65 Stockholm, Sweden
| | - Muhammad Mushtaq
- grid.4714.60000 0004 1937 0626Department of Microbiology, Tumor and Cell Biology (MTC), Karolinska Institutet, SE-171 65 Stockholm, Sweden ,grid.440526.10000 0004 0609 3164Present address: Department of Biotechnology, Faculty of Life Sciences and Informatics, Balochistan University of Information Technology, Engineering and Management Sciences, Quetta, 87300 Pakistan
| | - Judit Liaño-Pons
- grid.4714.60000 0004 1937 0626Department of Microbiology, Tumor and Cell Biology (MTC), Karolinska Institutet, SE-171 65 Stockholm, Sweden
| | - Aida Rodriguez-Garcia
- grid.4714.60000 0004 1937 0626Department of Microbiology, Tumor and Cell Biology (MTC), Karolinska Institutet, SE-171 65 Stockholm, Sweden
| | - Ye Yuan
- grid.4714.60000 0004 1937 0626Department of Microbiology, Tumor and Cell Biology (MTC), Karolinska Institutet, SE-171 65 Stockholm, Sweden
| | - Tong Liu
- grid.4714.60000 0004 1937 0626Department of Microbiology, Tumor and Cell Biology (MTC), Karolinska Institutet, SE-171 65 Stockholm, Sweden ,grid.4714.60000 0004 1937 0626Present address: Department of Medicine, Center for Molecular Medicine (CMM), Karolinska Institutet, SE-171 64 Stockholm, Sweden
| | - María Victoria Ruiz-Pérez
- grid.4714.60000 0004 1937 0626Department of Microbiology, Tumor and Cell Biology (MTC), Karolinska Institutet, SE-171 65 Stockholm, Sweden
| | - Susanne Schlisio
- grid.4714.60000 0004 1937 0626Department of Microbiology, Tumor and Cell Biology (MTC), Karolinska Institutet, SE-171 65 Stockholm, Sweden
| | - Oscar Bedoya-Reina
- grid.4714.60000 0004 1937 0626Department of Microbiology, Tumor and Cell Biology (MTC), Karolinska Institutet, SE-171 65 Stockholm, Sweden
| | - Marie Arsenian-Henriksson
- grid.4714.60000 0004 1937 0626Department of Microbiology, Tumor and Cell Biology (MTC), Karolinska Institutet, SE-171 65 Stockholm, Sweden
| |
Collapse
|
3
|
Sumei S, Xiangyun K, Fenrong C, Xueguang S, Sijun H, Bin B, Xiaolei S, Yongjiu T, Kaichun W, Qingchuan Z, Yongzhan N, Bin X. Hypermethylation of DHRS3 as a Novel Tumor Suppressor Involved in Tumor Growth and Prognosis in Gastric Cancer. Front Cell Dev Biol 2021; 9:624871. [PMID: 33553182 PMCID: PMC7859350 DOI: 10.3389/fcell.2021.624871] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Accepted: 01/04/2021] [Indexed: 12/22/2022] Open
Abstract
Background/Aims The role of DHRS3 in human cancer remains unclear. Our study explored the role of DHRS3 in gastric cancer (GC) and its clinicopathological significance and associated mechanisms. Materials Bisulfite-assisted genomic sequencing PCR and a Mass-Array system were used to evaluate and quantify the methylation levels of the promoter. The expression levels and biological function of DHRS3 was examined by both in vitro and in vivo assays. A two-way hierarchical cluster analysis was used to classify the methylation profiles, and the correlation between the methylation status of the DHRS3 promoter and the clinicopathological characteristics of GC were then assessed. Results The DHRS3 promoter was hypermethylated in GC samples, while the mRNA and protein levels of DHRS3 were significantly downregulated. Ectopic expression of DHRS3 in GC cells inhibited cell proliferation and migration in vitro, decreased tumor growth in vivo. DHRS3 methylation was correlated with histological type and poor differentiation of tumors. GC patients with high degrees of CpG 9.10 methylation had shorter survival times than those with lower methylation. Conclusion DHRS3 was hypermethylated and downregulated in GC patients. Reduced expression of DHRS3 is implicated in gastric carcinogenesis, which suggests DHRS3 is a tumor suppressor.
Collapse
Affiliation(s)
- Sha Sumei
- The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.,State Key Laboratory of Cancer Biology, Xijing Hospital of Digestive Diseases of the Air Force Medical University, Xi'an, China
| | - Kong Xiangyun
- State Key Laboratory of Cancer Biology, Xijing Hospital of Digestive Diseases of the Air Force Medical University, Xi'an, China.,Xi'an No.1 Hospital, Xi'an, China
| | - Chen Fenrong
- The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Sun Xueguang
- Division of Human Genetics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States
| | - Hu Sijun
- State Key Laboratory of Cancer Biology, Xijing Hospital of Digestive Diseases of the Air Force Medical University, Xi'an, China
| | - Bai Bin
- State Key Laboratory of Cancer Biology, Xijing Hospital of Digestive Diseases of the Air Force Medical University, Xi'an, China
| | - Shi Xiaolei
- State Key Laboratory of Cancer Biology, Xijing Hospital of Digestive Diseases of the Air Force Medical University, Xi'an, China.,Dongfang Hospital of Xiamen University, Fuzhou, China
| | - Tu Yongjiu
- The General Surgery Department of Chenggong Hospital of Xiamen University (Central Hospital of the 73th Chinese People's Liberation Army), Xiamen, China
| | - Wu Kaichun
- State Key Laboratory of Cancer Biology, Xijing Hospital of Digestive Diseases of the Air Force Medical University, Xi'an, China
| | - Zhao Qingchuan
- State Key Laboratory of Cancer Biology, Xijing Hospital of Digestive Diseases of the Air Force Medical University, Xi'an, China
| | - Nie Yongzhan
- State Key Laboratory of Cancer Biology, Xijing Hospital of Digestive Diseases of the Air Force Medical University, Xi'an, China
| | - Xu Bin
- State Key Laboratory of Cancer Biology, Xijing Hospital of Digestive Diseases of the Air Force Medical University, Xi'an, China.,The General Surgery Department of Chenggong Hospital of Xiamen University (Central Hospital of the 73th Chinese People's Liberation Army), Xiamen, China
| |
Collapse
|
4
|
Chandrasekaran V, Lea C, Sosa JC, Higgins D, Lein PJ. Reactive oxygen species are involved in BMP-induced dendritic growth in cultured rat sympathetic neurons. Mol Cell Neurosci 2015; 67:116-25. [PMID: 26079955 PMCID: PMC4550485 DOI: 10.1016/j.mcn.2015.06.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2014] [Revised: 05/26/2015] [Accepted: 06/12/2015] [Indexed: 12/28/2022] Open
Abstract
Previous studies have shown that bone morphogenetic proteins (BMPs) promote dendritic growth in sympathetic neurons; however, the downstream signaling molecules that mediate the dendrite promoting activity of BMPs are not well characterized. Here we test the hypothesis that reactive oxygen species (ROS)-mediated signaling links BMP receptor activation to dendritic growth. In cultured rat sympathetic neurons, exposure to any of the three mechanistically distinct antioxidants, diphenylene iodinium (DPI), nordihydroguaiaretic acid (NGA) or desferroxamine (DFO), blocked de novo BMP-induced dendritic growth. Addition of DPI to cultures previously induced with BMP to extend dendrites caused dendritic retraction while DFO and NGA prevented further growth of dendrites. The inhibition of the dendrite promoting activity of BMPs by antioxidants was concentration-dependent and occurred without altering axonal growth or neuronal cell survival. Antioxidant treatment did not block BMP activation of SMAD 1,5 as determined by nuclear localization of these SMADs. While BMP treatment did not cause a detectable increase in intracellular ROS in cultured sympathetic neurons as assessed using fluorescent indicator dyes, BMP treatment increased the oxygen consumption rate in cultured sympathetic neurons as determined using the Seahorse XF24 Analyzer, suggesting increased mitochondrial activity. In addition, BMPs upregulated expression of NADPH oxidase 2 (NOX2) and either pharmacological inhibition or siRNA knockdown of NOX2 significantly decreased BMP-7 induced dendritic growth. Collectively, these data support the hypothesis that ROS are involved in the downstream signaling events that mediate BMP7-induced dendritic growth in sympathetic neurons, and suggest that ROS-mediated signaling positively modulates dendritic complexity in peripheral neurons.
Collapse
Affiliation(s)
| | - Charlotte Lea
- Department of Biology, Saint Mary's College of California, Moraga, CA, USA
| | - Jose Carlo Sosa
- Department of Biology, Saint Mary's College of California, Moraga, CA, USA
| | - Dennis Higgins
- Department of Pharmacology and Toxicology, University of Buffalo, Buffalo, NY, USA
| | - Pamela J Lein
- Department of Molecular Biosciences, University of California, Davis, CA, USA
| |
Collapse
|
5
|
Wang C, Kane MA, Napoli JL. Multiple retinol and retinal dehydrogenases catalyze all-trans-retinoic acid biosynthesis in astrocytes. J Biol Chem 2010; 286:6542-53. [PMID: 21138835 DOI: 10.1074/jbc.m110.198382] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
All-trans-retinoic acid (atRA) stimulates neurogenesis, dendritic growth of hippocampal neurons, and higher cognitive functions, such as spatial learning and memory formation. Although astrocyte-derived atRA has been considered a key factor in neurogenesis, little direct evidence identifies hippocampus cell types and the enzymes that biosynthesize atRA. Here we show that primary rat astrocytes, but not neurons, biosynthesize atRA using multiple retinol dehydrogenases (Rdh) of the short chain dehydrogenase/reductase gene family and retinaldehyde dehydrogenases (Raldh). Astrocytes secrete atRA into their medium; neurons sequester atRA. The first step, conversion of retinol into retinal, is rate-limiting. Neurons and astrocytes both synthesize retinyl esters and reduce retinal into retinol. siRNA knockdown indicates that Rdh10, Rdh2 (mRdh1), and Raldh1, -2, and -3 contribute to atRA production. Knockdown of the Rdh Dhrs9 increased atRA synthesis ∼40% by increasing Raldh1 expression. Immunocytochemistry revealed cytosolic and nuclear expression of Raldh1 and cytosol and perinuclear expression of Raldh2. atRA autoregulated its concentrations by inducing retinyl ester synthesis via lecithin:retinol acyltransferase and stimulating its catabolism via inducing Cyp26B1. These data show that adult hippocampus astrocytes rely on multiple Rdh and Raldh to provide a paracrine source of atRA to neurons, and atRA regulates its own biosynthesis in astrocytes by directing flux of retinol. Observation of cross-talk between Dhrs9 and Raldh1 provides a novel mechanism of regulating atRA biosynthesis.
Collapse
Affiliation(s)
- Chao Wang
- Department of Nutritional Science and Toxicology, University of California, Berkeley, California 94720, USA
| | | | | |
Collapse
|
6
|
Mawson AR. On the association between low resting heart rate and chronic aggression: retinoid toxicity hypothesis. Prog Neuropsychopharmacol Biol Psychiatry 2009; 33:205-13. [PMID: 19063930 DOI: 10.1016/j.pnpbp.2008.10.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2008] [Revised: 10/03/2008] [Accepted: 10/24/2008] [Indexed: 11/19/2022]
Abstract
Low resting heart rate is a strong and consistent predictor of conduct disorder and chronic aggression. Explanations such as fearlessness and low arousal-induced stimulus-seeking have been offered, assuming a causal association between the phenomena, but the origin of low heart rate and its significance for understanding aggression and violence remain obscure. Retinoids (vitamin A and its congeners) play important roles in embryogenesis and neural development. Several lines of evidence also suggest a causal role of retinoids in aggression as well as cognitive and mood disorders. The hypothesis is proposed that retinoid overexpression in utero induces, via a noradrenergic-to-cholinergic switch, alterations in cardiac functioning and hemodynamics resulting in low resting heart rate, brain structural and functional changes, minor physical anomalies, and persistent aggression. Retinoid toxicity occurring early in pregnancy could represent a final common pathway by which various prenatal challenges result in conduct disorder and chronic aggression (e.g., maternal cigarette smoking, alcohol consumption, drug use, exposure to environmental chemicals, stress, trauma or infection). Implications of the model for understanding related aspects of chronic aggression are discussed, as well as strategies for prevention and treatment.
Collapse
Affiliation(s)
- Anthony R Mawson
- Department of Pediatrics, Division of Genetics and Epidemiology, University of Mississippi Medical Center, 2500 North State Street, Jackson, Mississippi 39216, USA.
| |
Collapse
|
7
|
Chen N, Napoli JL. All-trans-retinoic acid stimulates translation and induces spine formation in hippocampal neurons through a membrane-associated RARalpha. FASEB J 2007; 22:236-45. [PMID: 17712061 DOI: 10.1096/fj.07-8739com] [Citation(s) in RCA: 137] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Differentiation and patterning in the developing nervous system require the vitamin A metabolite all-trans-retinoic acid (atRA). Recent data suggest that higher cognitive functions, such as creation of hippocampal memory, also require atRA and its receptors, RAR, through affecting synaptic plasticity. Here we show that within 30 min atRA increased dendritic growth approximately 2-fold, and PSD-95 and synaptophysin puncta intensity approximately 3-fold, in cultured mouse hippocampal neurons, suggesting increased synapse formation. atRA (10 nM) increased ERK1/2 phosphorylation within 10 min. In synaptoneurosomes, atRA rapidly increased phosphorylation of ERK1/2, its target 4E-BP, and p70S6K, and its substrate, ribosome protein S6, indicating activation of MAPK and mammalian target of rapamycin (mTOR). Immunofluorescence revealed intense dendritic expression of RARalpha in the mouse hippocampus and localization of RARalpha on the surfaces of primary cultures of hippocampal neurons, with bright puncta along soma and neurites. Surface biotinylation confirmed the locus of RARalpha expression. Knockdown of RARalpha by shRNA impaired atRA-induced spine formation and abolished dendritic growth. Prolonged atRA stimulation reduced surface/total RARalpha by 43%, suggesting internalization, whereas brain-derived nerve growth factor or bicuculline increased the ratio by approximately 1.8-fold. atRA increased translation in the somatodendritic compartment, similar to brain-derived nerve growth factor. atRA specifically increased dendritic translation and surface expression of the alpha-amino-3-hydroxyl-5-methyl-4-isoxazole propionate receptor (AMPAR) subunit 1 (GluR1), without affecting GluR2. These data provide mechanistic insight into atRA function in the hippocampus and identify a unique membrane-associated RARalpha that mediates rapid induction of neuronal translation by atRA.
Collapse
Affiliation(s)
- Na Chen
- Nutritional Science and Toxicology, University of California, Berkeley, California 94720, USA
| | | |
Collapse
|
8
|
Chen HL, Panchision DM. Concise Review: Bone Morphogenetic Protein Pleiotropism in Neural Stem Cells and Their Derivatives-Alternative Pathways, Convergent Signals. Stem Cells 2006; 25:63-8. [PMID: 16973830 DOI: 10.1634/stemcells.2006-0339] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Bone morphogenetic proteins (BMPs) are a class of morphogens that are critical regulators of the central nervous system (CNS), peripheral nervous system, and craniofacial development. Modulation of BMP signaling also appears to be an important component of the postnatal stem cell niche. However, describing a comprehensive model of BMP actions is complicated by their paradoxical effects in precursor cells, which include dorsal specification, promoting proliferation or mitotic arrest, cell survival or death, and neuronal or glial fate. In addition, in postmitotic neurons BMPs can promote dendritic growth, act as axonal chemorepellants, and stabilize synapses. Although many of these responses depend on interactions with other incoming signals, some reflect the recruitment of distinct BMP signal transduction pathways. In this review, we classify the diverse effects of BMPs on neural cells, focus on the known mechanisms that specify distinct responses, and discuss the remaining challenges in identifying the cellular basis of BMP pleiotropism. Addressing these issues may have importance for stem cell mobilization, differentiation, and cell integration/survival in reparative therapies.
Collapse
Affiliation(s)
- Hui-Ling Chen
- Center for Neuroscience Research, Children's National Medical Center, Washington, DC 20010, USA
| | | |
Collapse
|
9
|
Clagett-Dame M, McNeill EM, Muley PD. Role of all-trans retinoic acid in neurite outgrowth and axonal elongation. ACTA ACUST UNITED AC 2006; 66:739-56. [PMID: 16688769 DOI: 10.1002/neu.20241] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The vitamin A metabolite, all-trans retinoic acid (atRA) plays essential roles in nervous system development, including neuronal patterning, survival, and neurite outgrowth. Our understanding of how the vitamin A acid functions in neurite outgrowth comes largely from cultured embryonic neurons and model neuronal cell systems including human neuroblastoma cells. Specifically, atRA has been shown to increase neurite outgrowth from embryonic DRG, sympathetic, spinal cord, and olfactory receptor neurons, as well as dissociated cerebra and retina explants. A role for atRA in axonal elongation is also supported by a limited number of studies in vivo, in which a deficiency in retinoid signaling produced either by dietary or genetic means has been shown to alter neurite outgrowth from the spinal cord and hindbrain regions. Human neuroblastoma cells also show enhanced numbers of neurites and longer processes in response to atRA. The mechanism whereby retinoids regulate neurite outgrowth includes, but is not limited to, the regulation of the transcription of neurotrophin receptors. More recent evidence supports a role for atRA in regulating components of other signaling pathways or candidate neurite-regulating factors. Some of these effects, such as that on neuron navigator 2 (NAV2), may be direct, whereas others may be secondary to other atRA-induced changes in the cell. This review focuses on what is currently known about neurite initiation and growth, with emphasis on the manner in which atRA may influence these events.
Collapse
Affiliation(s)
- Margaret Clagett-Dame
- Department of Biochemistry, University of Wisconsin-Madison, 433 Babcock Drive, Madison, Wisconsin 53706, USA.
| | | | | |
Collapse
|
10
|
Mey J. New therapeutic target for CNS injury? The role of retinoic acid signaling after nerve lesions. ACTA ACUST UNITED AC 2006; 66:757-79. [PMID: 16688771 DOI: 10.1002/neu.20238] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Experiments with sciatic nerve lesions and spinal cord contusion injury demonstrate that the retinoic acid (RA) signaling cascade is activated by these traumatic events. In both cases the RA-synthesizing enzyme is RALDH-2. In the PNS, lesions cause RA-induced gene transcription, intracellular translocation of retinoid receptors, and increased transcription of CRBP-I, CRABP-II, and retinoid receptors. The activation of RARbeta appears to be responsible for neurotrophic and neuritogenic effects of RA on dorsal root ganglia and embryonic spinal cord. While the physiological role of RA in the injured nervous system is still under investigation three domains of functions are suggested: (1) neuroprotection and support of axonal growth, (2) modulation of the inflammatory reaction by microglia/macrophages, and (3) regulation of glial differentiation. Few studies have been performed to support nerve regeneration with RA signals in vivo, but a large number of experiments with neuronal and glial cell cultures and spinal cord explants point to beneficial effects of RA, so that future therapeutic approaches will likely focus on the activation of RA signaling.
Collapse
Affiliation(s)
- Jörg Mey
- Institut für Biologie II, RWTH Aachen, Germany.
| |
Collapse
|
11
|
Abstract
The precise coordination of the many events in nervous system development is absolutely critical for the correct establishment of functional circuits. The postganglionic sympathetic neuron has been an amenable model for studying peripheral nervous system formation. Factors that control several developmental events, including multiple stages of axon extension, neuron survival and death, dendritogenesis, synaptogenesis, and establishment of functional diversity, have been identified in this neuron type. This knowledge allows us to integrate the various intricate processes involved in the formation of a functional sympathetic nervous system and thereby create a paradigm for understanding neuronal development in general.
Collapse
Affiliation(s)
- Natalia O Glebova
- Department of Neuroscience, Howard Hughes Medical Institute, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
| | | |
Collapse
|
12
|
Mey J, McCaffery P. Retinoic acid signaling in the nervous system of adult vertebrates. Neuroscientist 2005; 10:409-21. [PMID: 15359008 DOI: 10.1177/1073858404263520] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The majority of the functions of vitamin A are carried out by its metabolite, retinoic acid (RA), a potent transcriptional activator acting through members of the nuclear receptor family of transcription factors. In the CNS, RA was first recognized to be essential for the control of patterning and differentiation in the developing embryo. It has recently come to light, however, that many of the same functions that RA directs in the embryo are involved in the regulation of plasticity and regeneration in the adult brain. The same intricate metabolic control system of synthetic and catabolic enzymes, combined with cytoplasmic binding proteins, is used in both embryo and adult to create regions of high and low RA to modulate gene transcription. This review summarizes some of the discoveries in the new field of retinoid neurobiology including its functions in neural plasticity and LTP in the hippocampus; its possible role in motor disorders such as Parkinson's disease, motoneuron disease, and Huntington's disease; its role in regeneration after sciatic nerve and spinal cord injury; and its possible involvement in psychiatric diseases such as depression.
Collapse
Affiliation(s)
- Jörg Mey
- Institut für Biologie II, Aachen, Germany.
| | | |
Collapse
|
13
|
Antony P, Freysz L, Horrocks LA, Farooqui AA. Ca2+-independent phospholipases A2 and production of arachidonic acid in nuclei of LA-N-1 cell cultures: a specific receptor activation mediated with retinoic acid. BRAIN RESEARCH. MOLECULAR BRAIN RESEARCH 2003; 115:187-95. [PMID: 12877989 DOI: 10.1016/s0169-328x(03)00207-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The LA-N-1 cell nucleus contains Ca2+-independent phospholipase A2 (PLA2) activity hydrolyzing plasmenylethanolamine (PlsEtn) and 1,2-diacyl-sn-glycero-3-phosphoethanolamine (PtdEtn). These enzymes hydrolyze glycerophospholipids to produce arachidonic acid and lysoglycerophospholipids. The treatment of LA-N-1 cell cultures with all-trans retinoic acid (atRA) results in time- and dose-dependent stimulation of PlsEtn-PLA2 and PtdEtn-PLA2 activities in the nuclear fraction. PLA2 activities in the non-nuclear fraction (microsomes) are not affected by atRA, whilst the pan retinoic acid receptor (RAR) antagonist, BMS493, blocks the PLA2 activities in the nuclear fraction. This indicates that the stimulation of PLA2 activities is a receptor-mediated process. Treatment of LA-N-1 cell cultures with cycloheximide has no effect on basal PLA2 activities. However, atRA-mediated stimulation of PLA2 activities in LA-N-1 cell nuclei is partially inhibited by cycloheximide indicating that this decrease in PLA2 activity is due to a general decreased protein synthesis. Our results also support earlier studies in which atRA induces morphologic differentiation through the stimulation of PLA2-generated second messengers such as arachidonic acid and eicosanoids.
Collapse
Affiliation(s)
- Pierre Antony
- Laboratoire de Neurobiologie Moléculaire des Interactions Cellulaires, Institut de Chimie Biologique, Faculté de Médecine, 11 rue Humann, Strasbourg, France
| | | | | | | |
Collapse
|
14
|
Deb-Rinker P, O'Reilly RL, Torrey EF, Singh SM. Molecular characterization of a 2.7-kb, 12q13-specific, retroviral-related sequence isolated by RDA from monozygotic twin pairs discordant for schizophrenia. Genome 2002; 45:381-90. [PMID: 11962635 DOI: 10.1139/g01-152] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
This report deals with the molecular characterization of a representational difference analysis (RDA)-derived sequence (SZRV-2, GenBank accession No. AF135486; Genome Database accession Nos. 7692183 and 7501402) from three monozygotic twin pairs discordant for schizophrenia (MZD). The results suggest that it is a primate-specific, heavily methylated, and placentally expressed (-7-kb mRNA) endogenous retroviral-related (ERV) sequence of the human genome. We have mapped this sequence to 12q13 using two SZRV-2 positive BAC clones (4K11 (Genome Survey Sequence Database No. 1752076; GenBank accession No. AZ301773) and 501H16) by fluorescence in situ hybridization. End sequencing of the 4K11 BAC clone has allowed identification of nearby genes from the human genome database at NCBI that may be of interest in schizophrenia research. These include viral-related sequences (potential hot spots for insertions), developmental, channel, and signal transduction genes, as well as genes affecting expression of certain receptors in neurons. Furthermore, when used as a probe on Southern blots, SZRV-2 detected no difference between schizophrenia patients from southwestern Ontario and their matched controls. However, it identified aberrant methylation in one of the eight patients and none of the 21 unaffected controls. Although additional experiments will be required to establish the significance, if any, of SZRV-2 methylation in the complex etiology of schizophrenia, molecular results included offer a novel insight into the role of retroviral-related sequences in the origin, organization, and regulation of the human genome.
Collapse
Affiliation(s)
- Paromita Deb-Rinker
- Department of Zoology and Division of Medical Genetics, The University of Western Ontario, London, Canada
| | | | | | | |
Collapse
|
15
|
Maden M. Role and distribution of retinoic acid during CNS development. INTERNATIONAL REVIEW OF CYTOLOGY 2002; 209:1-77. [PMID: 11580199 DOI: 10.1016/s0074-7696(01)09010-6] [Citation(s) in RCA: 124] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Retinoic acid (RA), the biologically active derivative of vitamin A, induces a variety of embryonal carcinoma and neuroblastoma cell lines to differentiate into neurons. The molecular events underlying this process are reviewed with a view to determining whether these data can lead to a better understanding of the normal process of neuronal differentiation during development. Several transcription factors, intracellular signaling molecules, cytoplasmic proteins, and extracellular molecules are shown to be necessary and sufficient for RA-induced differentiation. The evidence that RA is an endogenous component of the developing central nervous system (CNS) is then reviewed, data which include high-pressure liquid chromotography (HPLC) measurements, reporter systems and the distribution of the enzymes that synthesize RA. The latter is particularly relevant to whether RA signals in a paracrine fashion on adjacent tissues or whether it acts in an autocrine manner on cells that synthesize it. It seems that a paracrine system may operate to begin early patterning events within the developing CNS from adjacent somites and later within the CNS itself to induce subsets of neurons. The distribution of retinoid-binding proteins, retinoid receptors, and RA-synthesizing enzymes is described as well as the effects of knockouts of these genes. Finally, the effects of a deficiency and an excess of RA on the developing CNS are described from the point of view of patterning the CNS, where it seems that the hindbrain is the most susceptible part of the CNS to altered levels of RA or RA receptors and also from the point of view of neuronal differentiation where, as in the case of embryonal carcinoma (EC) cells, RA promotes neuronal differentiation. The crucial roles played by certain genes, particularly the Hox genes in RA-induced patterning processes, are also emphasized.
Collapse
Affiliation(s)
- M Maden
- MRC Centre for Developmental Neurobiology, King's College London, United Kingdom
| |
Collapse
|
16
|
Dattatreyamurty B, Roux E, Horbinski C, Kaplan PL, Robak LA, Beck HN, Lein P, Higgins D, Chandrasekaran V. Cerebrospinal fluid contains biologically active bone morphogenetic protein-7. Exp Neurol 2001; 172:273-81. [PMID: 11716552 DOI: 10.1006/exnr.2001.7728] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Bone morphogenetic proteins (BMPs) regulate the development and function of many types of neurons. However, little is known of the actual concentrations of BMPs in the various parts of the brain. In this study, we considered the possibility that BMPs might be present in cerebrospinal fluid (CSF). Western blot analysis of normal adult bovine CSF revealed the presence of dimeric and monomeric forms of BMP-7, and the concentration of this molecule was found to be approximately 12 ng/ml in a radioimmunoassay. Since BMP-7 is known to induce dendritic growth in rat sympathetic neurons, this was used as a bioassay to examine the biological activity of the BMP-7 present in CSF. Addition of normal bovine CSF to cultures of sympathetic neurons produced a dose-dependent increase in dendritic growth and the magnitude of this response approximated that obtained with maximally effective concentrations of exogenous BMP-7. Moreover, CSF-induced dendritic growth was inhibited by follistatin, a protein that can sequester BMPs, and by either of two monoclonal antibodies that react with BMP-7. These results show that, unlike most other neurotrophic factors, BMP-7 is a constituent of normal CSF and is present at concentrations sufficient to elicit a near maximal biological response.
Collapse
|