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Bakalar D, Sweat S, Drossel G, Jiang SZ, Samal BS, Stroth N, Xu W, Zhang L, Zhang H, Eiden LE. Relationships between constitutive and acute gene regulation, and physiological and behavioral responses, mediated by the neuropeptide PACAP. Psychoneuroendocrinology 2022; 135:105447. [PMID: 34741979 PMCID: PMC8900973 DOI: 10.1016/j.psyneuen.2021.105447] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 09/10/2021] [Accepted: 10/08/2021] [Indexed: 01/03/2023]
Abstract
Since the advent of gene knock-out technology in 1987, insight into the role(s) of neuropeptides in centrally- and peripherally-mediated physiological regulation has been gleaned by examining altered physiological functioning in mammals, predominantly mice, after genetic editing to produce animals deficient in neuropeptides or their cognate G-protein coupled receptors (GPCRs). These results have complemented experiments involving infusion of neuropeptide agonists or antagonists systemically or into specific brain regions. Effects of gene loss are often interpreted as indicating that the peptide and its receptor(s) are required for the physiological or behavioral responses elicited in wild-type mice at the time of experimental examination. These interpretations presume that peptide/peptide receptor gene deletion affects only the expression of the peptide/receptor itself, and therefore impacts physiological events only at the time at which the experiment is conducted. A way to support 'real-time' interpretations of neuropeptide gene knock-out is to demonstrate that the wild-type transcriptome, except for the deliberately deleted gene(s), in tissues of interest, is preserved in the knock-out mouse. Here, we show that there is a cohort of genes (constitutively PACAP-Regulated Genes, or cPRGs) whose basal expression is affected by constitutive knock-out of the Adcyap1 gene in C57Bl6/N mice, and additional genes whose expression in response to physiological challenge, in adults, is altered or impaired in the absence of PACAP expression (acutely PACAP-Regulated Genes, or aPRGs). Distinguishing constitutive and acute transcriptomic effects of neuropeptide deficiency on physiological function and behavior in mice reveals alternative mechanisms of action, and changing functions of neuropeptides, throughout the lifespan.
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Affiliation(s)
- Dana Bakalar
- Section on Molecular Neuroscience, National Institute of Mental Heath - Intramural Research Program, Bethesda, MD. NIH, USA
| | - Sean Sweat
- Section on Molecular Neuroscience, National Institute of Mental Heath - Intramural Research Program, Bethesda, MD. NIH, USA
| | - Gunner Drossel
- Section on Molecular Neuroscience, National Institute of Mental Heath - Intramural Research Program, Bethesda, MD. NIH, USA
| | - Sunny Z. Jiang
- Section on Molecular Neuroscience, National Institute of Mental Heath - Intramural Research Program, Bethesda, MD. NIH, USA
| | - Babru S. Samal
- Section on Molecular Neuroscience, National Institute of Mental Heath - Intramural Research Program, Bethesda, MD. NIH, USA
| | - Nikolas Stroth
- Section on Molecular Neuroscience, National Institute of Mental Heath - Intramural Research Program, Bethesda, MD. NIH, USA
| | - Wenqin Xu
- Section on Molecular Neuroscience, National Institute of Mental Heath - Intramural Research Program, Bethesda, MD. NIH, USA
| | - Limei Zhang
- Section on Molecular Neuroscience, National Institute of Mental Heath - Intramural Research Program, Bethesda, MD. NIH, USA,Department of Physiology, Autonomous National University of Mexico (UNAM) Medical School, Mexico City, Mexico
| | - Haiying Zhang
- Section on Molecular Neuroscience, National Institute of Mental Heath - Intramural Research Program, Bethesda, MD. NIH, USA
| | - Lee E. Eiden
- Section on Molecular Neuroscience, National Institute of Mental Heath - Intramural Research Program, Bethesda, MD. NIH, USA,Correspondence Lee E. Eiden, Ph.D., Section on Molecular Neuroscience, National Institute of Mental Heath – Intramural Research Program, Bethesda, MD. NIH, USA, Phone: +13014964110,
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Wang P, Li XL, Cao ZH. STC1 ameliorates cognitive impairment and neuroinflammation of Alzheimer's disease mice via inhibition of ERK1/2 pathway. Immunobiology 2021; 226:152092. [PMID: 34004549 DOI: 10.1016/j.imbio.2021.152092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 03/29/2021] [Accepted: 03/30/2021] [Indexed: 02/04/2023]
Abstract
OBJECTIVE To investigate the regulatory role of STC1 (Stanniocalcin-1) mediated ERK1/2 pathway in cognitive impairment and neuroinflammation of Alzheimer's disease (AD). METHODS WT mice and STC1 Tg mice (transgenic overexpression of STC1) were used to establish AD models to perform behavioral test by Morris water maze. Hippocampal cell apoptosis was quantified by TUNEL staining, the levels of inflammatory cytokines in serum and hippocampal tissues determined by ELISA, as well as oxidative stress-related factors detected by corresponding testing kits, and protein expression of STC1 and ERK1/2 pathway measured by Western blotting. RESULTS Compared with WT Sham group, WT AD mice had prolonged escape latency, decreased crossing platform times, increased hippocampal cell apoptosis with up-regulated inflammatory cytokines and oxidative stress-related factors, as well as increased STC1 and ERK1/2 pathway-related molecules. By contrast, STC1 Tg AD mice showed shortened escape latency, increased crossing platform times than WT AD mice, and they also exhibited the decreased apoptosis index and inflammatory cytokines, alleviated oxidative stress-injury, down-regulated protein expression of ERK1/2 pathway, and up-regulated the protein expression of STC1 and UCP2. CONCLUSION STC1 overexpression could alleviate oxidative stress-induced injury, reduce neuroinflammation, improve cognitive function to play a neuro-protective role by inhibiting ERK1/2 signaling pathway.
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Affiliation(s)
- Pu Wang
- Department of Neurology, Xiangyang No. 1 People's Hospital, Hubei University of Medicine, Xiangyang, Hubei, China
| | - Xiao-Long Li
- Department of Neurology, Xiangyang No. 1 People's Hospital, Hubei University of Medicine, Xiangyang, Hubei, China
| | - Zhi-Hua Cao
- Department of Neurology, Xiangyang No. 1 People's Hospital, Hubei University of Medicine, Xiangyang, Hubei, China.
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Zhao F, Yang G, Feng M, Cao Z, Liu Y, Qiu J, You L, Zheng L, Zhang T, Zhao Y. Expression, function and clinical application of stanniocalcin-1 in cancer. J Cell Mol Med 2020; 24:7686-7696. [PMID: 32468698 PMCID: PMC7348177 DOI: 10.1111/jcmm.15348] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 10/10/2019] [Accepted: 10/19/2019] [Indexed: 12/13/2022] Open
Abstract
The glycoprotein stanniocalcin-1 functions as a regulatory endocrine hormone that maintains the balance of calcium and phosphorus in bony fish and as a paracrine/autocrine factor involved in many physiological/pathological processes in humans, including carcinogenesis. In this review, we provide an overview of (a) the possible mechanisms through which STC1 affects the malignant properties of cancer, (b) transcriptional and post-transcriptional regulation pathways of STC1 and (c) the potential clinical relevance of STC1 as a cancer biomarker and even a therapeutic target in the future. Exploring the role of STC1 in cancer development may provide a better understanding of the tumorigenesis process in humans and may facilitate finding an effective therapeutic method against cancer.
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Affiliation(s)
- Fangyu Zhao
- Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Gang Yang
- Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Mengyu Feng
- Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Zhe Cao
- Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yueze Liu
- Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Jiangdong Qiu
- Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Lei You
- Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Lianfang Zheng
- Department of Nuclear Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Taiping Zhang
- Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.,Clinical Immunology Center, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yupei Zhao
- Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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Bonfante S, Della Giustina A, Danielski LG, Denicol T, Joaquim L, Biehl E, Scopel G, de Carli RJ, Hubner M, Cardoso T, Tuon T, Generoso J, Barichello T, Terra S, Petronilho F. Stanniocalcin-1 ameliorates cerebral ischemia by decrease oxidative stress and blood brain barrier permeability. Microvasc Res 2019; 128:103956. [PMID: 31733304 DOI: 10.1016/j.mvr.2019.103956] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 11/11/2019] [Accepted: 11/12/2019] [Indexed: 02/07/2023]
Abstract
Blood brain barrier (BBB) permeability and oxidative stress have been reported to be important mechanisms for brain damage following ischemic stroke and stanniocalcin-1 (STC-1), a neuroprotective protein, has anti-inflammatory and anti-oxidative stress properties. Herein, we report the effect of STC-1 on BBB permeability and brain oxidative stress after stroke in an animal model. Male Wistar received an intracerebroventricularly injection of human recombinant STC-1 (100 ng/kg) or saline and were subjected to sham procedure or global cerebral ischemia/reperfusion (I/R) model. Six and 24 h after I/R, neurological evaluation was performed; at 24 h brain water content was evaluated in the total brain, and BBB permeability, nitrite/nitrate (N/N) concentration, lipid peroxidation, protein carbonyls formation, superoxide dismutase (SOD) and catalase (CAT) activity were determined in the hippocampus, cortex, prefrontal cortex, striatum and cerebellum. Rats exhibited neurological deficit at 6 and 24 h after I/R and STC-1 reduction at 24 h. After I/R there were an increase of brain water content, BBB permeability in the hippocampus, cortex and pre-frontal cortex and N/N in the hippocampus, and STC-1 decreased this level only in the hippocampus. STC-1 decreased lipid peroxidation in the hippocampus, cortex and prefrontal cortex and protein oxidative damage in the hippocampus and cortex. SOD activity decreased in the hippocampus, cortex and prefrontal cortex after I/R and STC-1 reestablished these levels in the hippocampus and cortex. CAT activity decreased only in the hippocampus and cortex and STC-1 increased the CAT activity in the hippocampus. Our data provide the first experimental demonstration that STC-1 reduced brain dysfunction associated with cerebral I/R in rats, by decreasing BBB permeability and oxidative stress parameters.
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Affiliation(s)
- Sandra Bonfante
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Amanda Della Giustina
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Lucineia Gainski Danielski
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Tais Denicol
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Larissa Joaquim
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Erica Biehl
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Gabriel Scopel
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Raquel Jaconi de Carli
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Marcos Hubner
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Taise Cardoso
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, SC, Brazil
| | - Talita Tuon
- Graduate Program in Rehabilitation Sciences, Federal University of Santa Catarina, Ararangua, SC, Brazil
| | - Jaqueline Generoso
- Laboratory of Experimental Pathophysiology, Graduate Program in Health Sciences, University of Southern Santa Catarina, Criciúma, SC, Brazil
| | - Tatiana Barichello
- Laboratory of Experimental Pathophysiology, Graduate Program in Health Sciences, University of Southern Santa Catarina, Criciúma, SC, Brazil; Center of Excellence on Mood Disorders, Department of Psychiatry and Behavioral Sciences, McGovern Medical School, The University of Texas Health Science Center at Houston (UTHealth), Houston, TX, USA; Translational Psychiatry Program, Department of Psychiatry and Behavioral Sciences, McGovern Medical School, The University of Texas Health Science Center at Houston (UTHealth), Houston, TX, USA
| | - Silvia Terra
- Postgraduate Program: Biochemistry, Universidade Federal do Rio Grande do Sul (UFRGS), Brazil
| | - Fabricia Petronilho
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, SC, Brazil.
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Differential Pharmacophore Definition of the cAMP Binding Sites of Neuritogenic cAMP Sensor-Rapgef2, Protein Kinase A, and Exchange Protein Activated by cAMP in Neuroendocrine Cells Using an Adenine-Based Scaffold. ACS Chem Neurosci 2017; 8:1500-1509. [PMID: 28290664 DOI: 10.1021/acschemneuro.6b00462] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
We recently reported that the adenylate cyclase (AC) inhibitor SQ22,536 (9-tetrahydrofuranyl-adenine) also has inhibitory activity against the neuroendocrine-specific neuritogenic cAMP sensor-Rapgef2 (NCS-Rapgef2), a guanine nucleotide exchanger and activator for the small effector GTPase Rap1. Cell-based assays that distinguish signaling through the three intracellular cAMP sensors NCS-Rapgef2, exchange protein activated by cAMP (Epac), and protein kinase A (PKA), as well as AC, were used. These, collectively, assess the activities of adenine (6-amino-purine) derivatives modified at several positions to enhance selectivity for NCS-Rapgef2 by decreasing affinity for adenylate cyclase (AC), without increasing affinity for PKA or Epac. Testing of each adenine derivative in whole-cell assays incorporates features of cell permeability, target selectivity, and intrinsic potency into a single EC50 or IC50, making robust extrapolation to compound activity in vivo more likely. N6-MBC-cAMP is a selective PKA activator (EC50 = 265 μM) with low efficacy at NCS-Rapgef2. 8-CPT-2'-O-Me-cAMP and ESI-09 are confirmed as Epac-selective, for stimulation and inhibition, respectively, versus both PKA and NCS-Rapgef2. The compound N6-Phe-cAMP is a full agonist of NCS-Rapgef2 (EC50 = 256 μM). It has little or no activity against Epac or PKA. The compound N6-phenyl-9-tetrahydrofuranyladenine is a novel and potent NCS-Rapgef2 inhibitor without activity at PKA, Epac, or ACs, as assayed in the neuroendocrine NS-1 cell line. This line has been engineered to allow high-content screening for activation and inhibition of AC, PKA, Epac, and NCS-Rapgef2 and the cellular activities initiated by these signaling pathway protein components.
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Aghajanova L, Altmäe S, Kasvandik S, Salumets A, Stavreus-Evers A, Giudice LC. Stanniocalcin-1 expression in normal human endometrium and dysregulation in endometriosis. Fertil Steril 2016; 106:681-691.e1. [PMID: 27322879 PMCID: PMC5010972 DOI: 10.1016/j.fertnstert.2016.05.023] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 05/19/2016] [Accepted: 05/25/2016] [Indexed: 01/29/2023]
Abstract
OBJECTIVE To determine expression of stanniocalcin-1 (STC1) in human endometrium with and without endometriosis and its regulation by steroid hormones. DESIGN Laboratory study. SETTING University. PATIENT(S) Nineteen women with endometriosis and 33 control women. INTERVENTION(S) Endometrial biopsy and fluid sampling. MAIN OUTCOME MEASURE(S) Analysis of early secretory (ESE) and midsecretory (MSE) endometrial secretomes from fertile women with the use of nano-liquid chromatography-dual mass spectrometry; real-time quantitative polymerase chain reaction, and immunohistochemistry for STC1 and its receptor calcium-sensing receptor (CASR) mRNA and proteins in endometrium with and without endometriosis; evaluation of STC1 and CASR mRNA expression in endometrial stromal fibroblasts (eSF) from women with and without endometriosis decidualized with the use of E2P or 8-bromo-cyclic adenosine monophosphate (cAMP). RESULT(S) STC1 protein was strongly up-regulated in MSE versus ESE in endometrial fluid of fertile women. STC1 mRNA significantly increased in MSE from women with, but not from those without, endometriosis, compared with proliferative endometrium or ESE, with no significant difference throughout the menstrual cycle between groups. STC1 mRNA in eSF from control women increased >230-fold on decidualization with the use of cAMP versus 45-fold from women with endometriosis, which was not seen on decidualization with E2/P. CASR mRNA did not exhibit significant differences in any condition and was not expressed in isolated eSF. STC1 protein immunoexpression in eSF was significantly lower in women with endometriosis compared with control women. CONCLUSION(S) STC1 protein is significantly up-regulated in MSE endometrial fluid and is dysregulated in eutopic endometrial tissue from women with endometriosis. It is likely regulated by cAMP and may be involved in the pathogenesis of decidualization defects.
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Affiliation(s)
- Lusine Aghajanova
- Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California San Francisco, San Francisco, California.
| | - Signe Altmäe
- Competence Center on Health Technologies, Tartu, Estonia; Department of Pediatrics, School of Medicine, University of Granada, Granada, Spain
| | - Sergo Kasvandik
- Competence Center on Health Technologies, Tartu, Estonia; Proteomics Core Facility, Institute of Technology, University of Tartu, Tartu, Estonia; Tartu University Women's Clinic, Tartu, Estonia
| | - Andres Salumets
- Competence Center on Health Technologies, Tartu, Estonia; Tartu University Women's Clinic, Tartu, Estonia
| | | | - Linda C Giudice
- Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California San Francisco, San Francisco, California
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Jiang SZ, Eiden LE. PACAPergic Synaptic Signaling and Circuitry Mediating Mammalian Responses to Psychogenic and Systemic Stressors. CURRENT TOPICS IN NEUROTOXICITY 2016. [DOI: 10.1007/978-3-319-35135-3_41] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Al-Qudah M, Alkahtani R, Akbarali H, Murthy K, Grider J. Stimulation of synthesis and release of brain-derived neurotropic factor from intestinal smooth muscle cells by substance P and pituitary adenylate cyclase-activating peptide. Neurogastroenterol Motil 2015; 27:1162-74. [PMID: 26088546 PMCID: PMC4520799 DOI: 10.1111/nmo.12604] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Accepted: 04/29/2015] [Indexed: 12/17/2022]
Abstract
BACKGROUND Brain-derived neurotrophic factor (BDNF) is a neurotrophin present in the intestine where it participates in survival and growth of enteric neurons, augmentation of enteric circuits, and stimulation of intestinal peristalsis and propulsion. Previous studies largely focused on the role of neural and mucosal BDNF. The expression and release of BDNF from intestinal smooth muscle and the interaction with enteric neuropeptides has not been studied in gut. METHODS The expression and secretion of BDNF from smooth muscle cultured from the rabbit intestinal longitudinal muscle layer in response to substance P (SP) and pituitary adenylate cyclase-activating peptide (PACAP) was measured by western blot and enzyme-linked immunosorbent assay. BDNF mRNA was measured by reverse-transcription polymerase chain reaction. KEY RESULTS The expression of BNDF protein and mRNA was greater in smooth muscle cells (SMCs) from the longitudinal muscle than from circular muscle layer. PACAP and SP increased the expression of BDNF protein and mRNA in cultured longitudinal SMCs. PACAP and SP also stimulated the secretion of BDNF from cultured longitudinal SMCs. Chelation of intracellular calcium with BAPTA (1,2-bis-(o-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid) prevented SP-induced increase in BDNF mRNA and protein expression and SP-induced secretion of BDNF. CONCLUSIONS & INFERENCES Neuropeptides known to be present in enteric neurons innervating the longitudinal layer increase the expression of BDNF mRNA and protein in SMCs and stimulate the release of BDNF. Considering the ability of BDNF to enhance smooth muscle contraction, this autocrine loop may partially explain the characteristic hypercontractility of longitudinal muscle in inflammatory bowel disease.
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Affiliation(s)
- M. Al-Qudah
- Department of Physiology and Biophysics, VCU Program in Enteric Neuromuscular Sciences (VPENS), School of Medicine, Virginia Commonwealth University, Richmond Virginia
| | - R. Alkahtani
- Department of Physiology and Biophysics, VCU Program in Enteric Neuromuscular Sciences (VPENS), School of Medicine, Virginia Commonwealth University, Richmond Virginia
| | - H.I. Akbarali
- Department of Pharmacology and Toxicology, VCU Program in Enteric Neuromuscular Sciences (VPENS), School of Medicine, Virginia Commonwealth University, Richmond Virginia
| | - K.S. Murthy
- Department of Physiology and Biophysics, VCU Program in Enteric Neuromuscular Sciences (VPENS), School of Medicine, Virginia Commonwealth University, Richmond Virginia
| | - J.R. Grider
- Department of Physiology and Biophysics, VCU Program in Enteric Neuromuscular Sciences (VPENS), School of Medicine, Virginia Commonwealth University, Richmond Virginia
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Perinatal Positive and Negative Influences on the Early Neurobehavioral Reflex and Motor Development. PERINATAL PROGRAMMING OF NEURODEVELOPMENT 2015; 10:149-67. [DOI: 10.1007/978-1-4939-1372-5_8] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Huang H, Wang H, Figueiredo-Pereira ME. Regulating the ubiquitin/proteasome pathway via cAMP-signaling: neuroprotective potential. Cell Biochem Biophys 2014; 67:55-66. [PMID: 23686612 DOI: 10.1007/s12013-013-9628-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The cAMP-signaling pathway has been under intensive investigation for decades. It is a wonder that such a small simple molecule like cAMP can modulate a vast number of diverse processes in different types of cells. The ubiquitous involvement of cAMP-signaling in a variety of cellular events requires tight spatial and temporal control of its generation, propagation, compartmentalization, and elimination. Among the various steps of the cAMP-signaling pathway, G-protein-coupled receptors, adenylate cyclases, phosphodiesterases, the two major cAMP targets, i.e., protein kinase A and exchange protein activated by cAMP, as well as the A-kinase anchoring proteins, are potential targets for drug development. Herein we review the recent progress on the regulation and manipulation of different steps of the cAMP-signaling pathway. We end by focusing on the emerging role of cAMP-signaling in modulating protein degradation via the ubiquitin/proteasome pathway. New discoveries on the regulation of the ubiquitin/proteasome pathway by cAMP-signaling support the development of new therapeutic approaches to prevent proteotoxicity in chronic neurodegenerative disorders and other human disease conditions associated with impaired protein turnover by the ubiquitin/proteasome pathway and the accumulation of ubiquitin-protein aggregates.
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Affiliation(s)
- He Huang
- Department of Biological Sciences, Hunter College and Graduate Center, City University of New York, 695 Park Avenue, New York, NY 10065, USA
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Emery AC, Eiden MV, Mustafa T, Eiden LE. Rapgef2 connects GPCR-mediated cAMP signals to ERK activation in neuronal and endocrine cells. Sci Signal 2013; 6:ra51. [PMID: 23800469 PMCID: PMC3932028 DOI: 10.1126/scisignal.2003993] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
G protein (heterotrimeric guanine nucleotide-binding protein)-coupled receptor (GPCR)-mediated increases in the second messenger cyclic adenosine monophosphate (cAMP) activate the mitogen-activated protein kinase (MAPK) extracellular signal-regulated kinase (ERK), and in neuroendocrine cells, this pathway leads to cAMP-dependent neuritogenesis mediated through Rap1 and B-Raf. We found that the Rap guanine nucleotide exchange factor Rapgef2 was enriched from primary bovine neuroendocrine cells by cAMP-agarose affinity chromatography and that it was specifically eluted by cAMP. With loss-of-function experiments in the rat neuronal cell line Neuroscreen-1 (NS-1) and gain-of-function experiments in human embryonic kidney 293T cells, we demonstrated that Rapgef2 connected GPCR-dependent activation of adenylate cyclase and increased cAMP concentration with the activation of ERK in neurons and endocrine cells. Furthermore, knockdown of Rapgef2 blocked cAMP- and ERK-dependent neuritogenesis. Our data are consistent with a pathway involving the cAMP-mediated activation of Rapgef2, which then stimulates Rap1, leading to increases in B-Raf, MEK, and ERK activity.
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Affiliation(s)
- Andrew C. Emery
- Section on Molecular Neuroscience, Laboratory of Cellular and Molecular Regulation, National Institute of Mental Health (NIMH) Intramural Research Program, Bethesda, MD 20892, USA
| | - Maribeth V. Eiden
- Section on Directed Gene Transfer, Laboratory of Cellular and Molecular Regulation, NIMH Intramural Research Program, Bethesda, MD 20892, USA
| | - Tomris Mustafa
- Section on Molecular Neuroscience, Laboratory of Cellular and Molecular Regulation, National Institute of Mental Health (NIMH) Intramural Research Program, Bethesda, MD 20892, USA
| | - Lee E. Eiden
- Section on Molecular Neuroscience, Laboratory of Cellular and Molecular Regulation, National Institute of Mental Health (NIMH) Intramural Research Program, Bethesda, MD 20892, USA
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Blechman J, Levkowitz G. Alternative Splicing of the Pituitary Adenylate Cyclase-Activating Polypeptide Receptor PAC1: Mechanisms of Fine Tuning of Brain Activity. Front Endocrinol (Lausanne) 2013; 4:55. [PMID: 23734144 PMCID: PMC3659299 DOI: 10.3389/fendo.2013.00055] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2012] [Accepted: 04/24/2013] [Indexed: 12/11/2022] Open
Abstract
Alternative splicing of the precursor mRNA encoding for the neuropeptide receptor PAC1/ADCYAP1R1 generates multiple protein products that exhibit pleiotropic activities. Recent studies in mammals and zebrafish have implicated some of these splice isoforms in control of both cellular and body homeostasis. Here, we review the regulation of PAC1 splice variants and their underlying signal transduction and physiological processes in the nervous system.
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Affiliation(s)
- Janna Blechman
- Department of Molecular Cell Biology, Weizmann Institute of ScienceRehovot, Israel
| | - Gil Levkowitz
- Department of Molecular Cell Biology, Weizmann Institute of ScienceRehovot, Israel
- *Correspondence: Gil Levkowitz, Department of Molecular Cell Biology, Weizmann Institute of Science, P. O. Box 26, Rehovot 76100, Israel. e-mail:
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Emery AC, Eiden MV, Eiden LE. A new site and mechanism of action for the widely used adenylate cyclase inhibitor SQ22,536. Mol Pharmacol 2012; 83:95-105. [PMID: 23053667 DOI: 10.1124/mol.112.081760] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
We evaluated the efficacy, potency, and selectivity of the three most commonly used adenylate cyclase (AC) inhibitors in a battery of cell lines constructed to study signaling via three discrete cAMP sensors identified in neuroendocrine cells. SQ22,536 [9-(tetrahydrofuryl)-adenine] and 2',5'-dideoxyadenosine (ddAd) are effective and potent AC inhibitors in HEK293 cells expressing a cAMP response element (CRE) reporter gene, and MDL-12,330A [cis-N-(2-phenylcyclopentyl)azacyclotridec-1-en-2-amine hydrochloride] is not. Neuroscreen-1 (NS-1) cells were used to assess the specificity of the most potent AC inhibitor, SQ22,536, to block downstream cAMP signaling to phosphorylate CREB (via PKA); to activate Rap1 (via Epac); and to activate ERK signaling leading to neuritogenesis (via the newly described neuritogenic cAMP sensor NCS). SQ22,536 failed to inhibit the effects of cAMP analogs 8-Br-cAMP and 8-CPT-2'-O-Me-cAMP on PKA-mediated CREB activation/phosphorylation and Epac-mediated Rap1 activation, indicating that it does not inhibit these cAMP pathways beyond the level of AC. On the other hand, SQ22,536, but not ddAd, inhibited the effects of cAMP analogs 8-Br-cAMP and 8-CPT-cAMP on ERK phosphorylation and neuritogenesis, indicating that it acts not only as an AC blocker, but also as an inhibitor of the NCS. The observed off-target actions of SQ22,536 are specific to cAMP signaling: SQ22,536 does not block the actions of compounds not related to cAMP signaling, including ERK induction by PMA, and ERK activation and neuritogenesis induced by NGF. These data led us to indicate a second target for SQ22,536 that should be considered when interpreting its effects in whole cell and in vivo experiments.
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Affiliation(s)
- Andrew C Emery
- National Institute of Mental Health, 49 Convent Drive, Building 49, Room 5A-38, Bethesda, MD 20892-4090, USA
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Is PACAP the major neurotransmitter for stress transduction at the adrenomedullary synapse? J Mol Neurosci 2012; 48:403-12. [PMID: 22610912 DOI: 10.1007/s12031-012-9749-x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2012] [Accepted: 03/06/2012] [Indexed: 01/05/2023]
Abstract
It has been known for more than a decade that the neuropeptide PACAP (pituitary adenylate cyclase-activating polypeptide) is co-stored with acetylcholine in the splanchnic nerve terminals innervating the adrenal medulla. Both transmitters are robust secretagogues for catecholamine release from chromaffin cells. Here, we review the unique contribution of PACAP to the functioning of the splanchnic-adrenal synapse in stress. While acetylcholine is released across a wide range of firing frequencies, PACAP is released only at high frequencies of stimulation, and its role in the regulation of epinephrine secretion and biosynthesis is highly specialized. PACAP is responsible for long-term catecholamine secretion using secretory mechanisms different from the rapidly desensitizing depolarization evoked by acetylcholine through nicotinic receptor activation. PACAP signaling also maintains catecholamine synthesis required for sustained secretion during prolonged stress via induction of the enzymes TH and PNMT, and enhances transcription of additional secreted molecules found in chromaffin cells that alter further secretion through both autocrine and paracrine mechanisms. PACAP thus mediates chromaffin cell plasticity via functional encoding of cellular experience. These features of PACAP action at the splanchnic-adrenal synapse may be paradigmatic for the general actions of neuropeptides as effectors of stimulus-secretion-synthesis coupling in stress.
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Emery AC, Eiden LE. Signaling through the neuropeptide GPCR PAC₁ induces neuritogenesis via a single linear cAMP- and ERK-dependent pathway using a novel cAMP sensor. FASEB J 2012; 26:3199-211. [PMID: 22532442 DOI: 10.1096/fj.11-203042] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Both cAMP and ERK are necessary for neuroendocrine cell neuritogenesis, and pituitary adenylate cyclase-activating polypeptide (PACAP) activates each. It is important to know whether cAMP and ERK are arranged in a novel, linear pathway or in two parallel pathways using known signaling mechanisms. Native cellular responses [cAMP elevation, ERK phosphorylation, cAMP responsive element binding (CREB) phosphorylation, and neuritogenesis] and promoter-reporter gene activation after treatment with forskolin, cAMP analogs, and PACAP were measured in Neuroscreen-1 (NS-1) cells, a PC12 variant enabling simultaneous morphological, molecular biological, and biochemical analysis. Forskolin (25 μM) and cAMP analogs (8-bromo-cAMP, dibutyryl-cAMP, and 8-chlorophenylthio-cAMP) stimulated ERK phosphorylation and neuritogenesis in NS-1 cells. Both ERK phosphorylation and neuritogenesis were MEK dependent (blocked by 10 μM U0126) and PKA independent (insensitive to 30 μM H-89 or 100 nM myristoylated protein kinase A inhibitor). CREB phosphorylation induced by PACAP was blocked by H-89. The exchange protein activated by cAMP (Epac)-selective 8-(4-chlorophenylthio)-2'-O-Me-cAMP (100-500 μM) activated Rap1 without affecting the other cAMP-dependent processes. Thus, PACAP-38 potently stimulated two distinct and independent cAMP pathways leading to CREB or ERK activation in NS-1 cells. Drug concentrations for appropriate effect were derived from control data for all compounds. In summary, a novel PKA- and Epac-independent signaling pathway: PACAP → adenylate cyclase → cAMP → ERK → neuritogenesis has been identified.
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Affiliation(s)
- Andrew C Emery
- Section on Molecular Neuroscience, Laboratory of Cellular and Molecular Regulation, National Institute of Mental Health, Bethesda, Maryland 20892-4090, USA
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