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Zhou M, Wang L, Wang Z, Chang X, Zhu X. Celiac vagus nerve mediates expression of the acetylcholine receptor α7nAChR on monocytes in the spleen. Biochem Biophys Res Commun 2022; 613:174-179. [PMID: 35597124 DOI: 10.1016/j.bbrc.2022.05.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Accepted: 05/02/2022] [Indexed: 12/16/2022]
Abstract
The spleen is required for the vagal cholinergic anti-inflammatory activity to maintain systemic immune homeostasis, but the underlying mechanism of this function is not fully understood yet. We hypothesized that vagus nerve mediates alpha 7 nicotinic acetylcholine receptor (α7nAChR) expression in monocytes, an essential regulator of cholinergic anti-inflammatory activity, and the spleen is essential site for this process. To verify this hypothesis, mice were subjected to splenectomy or celiac vagotomy. The level of α7nAChR expression in circulating monocytes was analyzed by real-time PCR. Impact of α7nAChR agonist PNU282987 on LPS-evoked release of TNF-α and IL-1β from circulating monocytes was assessed by ELISA. The effect of norepinephrine (NE), acetylcholine (ACh) and neuregulin-1 (NRG-1) on α7nAChR expression was detected by real-time PCR. We found that splenectomy or celiac vagotomy abrogated α7nAChR expression in circulating monocytes. LPS-induced release of TNF-α and IL-1β from these monocytes was not alleviated significantly by PNU282987 as compared with that of sham mice. NE and ACh addition fails to stimulate α7nAChR expression, but, NRG-1 treatment can significantly induce α7nAChR expression in these monocytes compared with untreated cells in vitro. Overall, our results reveal that celiac vagus nerve mediates α7nAChR expression in monocytes, and the spleen is indispensable site for this process.
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Affiliation(s)
- Mengxiao Zhou
- Key Laboratory of Clinical Diagnostics, North University of Hebei, Zhangjiakou, 075000, China; Department of Blood Transfusion, The Forth Hospital of Shijiazhuang, Shijiazhuang, 050000, China
| | - Lijuan Wang
- Department of Day Care Unit, Gansu Hospital of Traditional Chinese Medicine, Lanzhou, 730030, China
| | - Zihan Wang
- Department of Basic Medicine, Medical University of Zunyi, Zunyi, 563000, China
| | - Xiaotong Chang
- Key Laboratory of Clinical Diagnostics, North University of Hebei, Zhangjiakou, 075000, China.
| | - Xiaobo Zhu
- Key Laboratory of Clinical Diagnostics, North University of Hebei, Zhangjiakou, 075000, China.
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2
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Li ZL, Gou CY, Wang WH, Li Y, Cui Y, Duan JJ, Chen Y. A novel effect of PDLIM5 in α7 nicotinic acetylcholine receptor upregulation and surface expression. Cell Mol Life Sci 2022; 79:64. [PMID: 35013841 PMCID: PMC11072317 DOI: 10.1007/s00018-021-04115-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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: 08/30/2021] [Revised: 12/17/2021] [Accepted: 12/23/2021] [Indexed: 11/29/2022]
Abstract
Nicotinic acetylcholine receptors (nAChRs) are widespread throughout the central nervous system. Signaling through nAChRs contributes to numerous higher-order functions, including memory and cognition, as well as abnormalities such as nicotine addiction and neurodegenerative disorders. Although recent studies indicate that the PDZ-containing proteins comprising PSD-95 family co-localize with nicotinic acetylcholine receptors and mediate downstream signaling in the neurons, the mechanisms by which α7nAChRs are regulated remain unclear. Here, we show that the PDZ-LIM domain family protein PDLIM5 binds to α7nAChRs and plays a role in nicotine-induced α7nAChRs upregulation and surface expression. We find that chronic exposure to 1 μM nicotine upregulated α7, β2-contained nAChRs and PDLIM5 in cultured hippocampal neurons, and the upregulation of α7nAChRs and PDLIM5 is increased more on the cell membrane than the cytoplasm. Interestingly, in primary hippocampal neurons, α7nAChRs and β2nAChRs display distinct patterns of expression, with α7nAChRs colocalized more with PDLIM5. Furthermore, PDLIM5 interacts with α7nAChRs, but not β2nAChRs in native brain neurons. Knocking down of PDLIM5 in SH-SY5Y abolishes nicotine-induced upregulation of α7nAChRs. In primary hippocampal neurons, using shRNA against PDLIM5 decreased both surface clustering of α7nAChRs and α7nAChRs-mediated currents. Proteomics analysis and isothermal titration calorimetry (ITC) results show that PDLIM5 interacts with α7nAChRs through the PDZ domain, and the interaction between PDLIM5 and α7nAChRs can be promoted by nicotine. Collectively, our data suggest a novel cellular role of PDLIM5 in the regulation of α7nAChRs, which may be relevant to plastic changes in the nervous system.
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Affiliation(s)
- Zi-Lin Li
- Neurobiology Research Center, School of Medicine, Shenzhen Campus of Sun Yat-Sen University, No. 66, Gongchang Road, Guangming District, Shenzhen, 518107, Guangdong, People's Republic of China
| | - Chen-Yu Gou
- Department of Anatomy and Neurobiology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzho, 510080, Guangdong, People's Republic of China
| | - Wen-Hui Wang
- Neurobiology Research Center, School of Medicine, Shenzhen Campus of Sun Yat-Sen University, No. 66, Gongchang Road, Guangming District, Shenzhen, 518107, Guangdong, People's Republic of China
| | - Yuan Li
- Department of Anatomy and Neurobiology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzho, 510080, Guangdong, People's Republic of China
| | - Yu Cui
- Neurobiology Research Center, School of Medicine, Shenzhen Campus of Sun Yat-Sen University, No. 66, Gongchang Road, Guangming District, Shenzhen, 518107, Guangdong, People's Republic of China
| | - Jing-Jing Duan
- Department of Anatomy and Neurobiology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzho, 510080, Guangdong, People's Republic of China.
- Guangdong Province Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, Guangdong, People's Republic of China.
| | - Yuan Chen
- Neurobiology Research Center, School of Medicine, Shenzhen Campus of Sun Yat-Sen University, No. 66, Gongchang Road, Guangming District, Shenzhen, 518107, Guangdong, People's Republic of China.
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3
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Feng L, Huang F, Ma Y, Tang J. The Effect of High-Fat Diet and Exercise Intervention on the TNF-α Level in Rat Spleen. Front Immunol 2021; 12:671167. [PMID: 34975827 PMCID: PMC8714663 DOI: 10.3389/fimmu.2021.671167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 08/05/2021] [Indexed: 01/22/2023] Open
Abstract
High-fat diet (HFD) consumption can trigger chronic inflammation in some tissues. However, it remains unclear if HFD induces chronic inflammation in the spleen. This investigation aims to address the effect of HFD consumption and exercise intervention on the level of tumor necrosis factor alpha (TNF-α) in the spleen. Rats were subjected to HFD feeding and/or moderate-intensity treadmill running. The TNF-α levels in plasma and spleen were detected by ELISA. The mass and total cell numbers of the spleen were measured. In addition, the expression of TNF-α and its relevant gene mRNAs in macrophages from the spleen were analyzed by qRT-PCR. We found that HFD consumption did not significantly affect the mass and total cell numbers of the spleen. However, HFD consumption significantly increased splenic TNF-α level, the expression of TNF-α, toll-like receptor 4, and nuclear factor κB p65 mRNAs. In contrast, the expression of nicotinic acetylcholine receptor alpha 7 subunit (α7nAChR) mRNA in macrophages was downregulated. Additionally, exercise abolished the increase in splenic TNF-α level as well as the abnormal expression of TNF-α and related gene mRNAs in macrophages in HFD-fed rats. In conclusion, our results reveal that HFD consumption increases TNF-α level in the spleen, which is along with upregulation of the expression of TLR4 and NF-κB mRNAs as well as downregulation of the expression of α7nAChR mRNA in splenic macrophages in rats. Exercise abolished detrimental effects of HFD on TNF-α level in the spleen and prevented abnormal expression of these genes in the macrophages from rat spleen.
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Affiliation(s)
- Lin Feng
- Sport Hospital Affiliated to Chengdu Sport University, Chengdu Sport University, Chengdu, China
| | - Feiyun Huang
- Key Laboratory of Bio-Resources and Eco-Environment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, China
| | - Yinan Ma
- Department of Physical Education, Yili Normal University, Yining, China
- *Correspondence: Yinan Ma, ; Jialing Ting,
| | - Jialing Tang
- Department of P.E., Central South University, Changsha, China
- *Correspondence: Yinan Ma, ; Jialing Ting,
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4
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Maroli A, Di Lascio S, Drufuca L, Cardani S, Setten E, Locati M, Fornasari D, Benfante R. Effect of donepezil on the expression and responsiveness to LPS of CHRNA7 and CHRFAM7A in macrophages: A possible link to the cholinergic anti-inflammatory pathway. J Neuroimmunol 2019; 332:155-166. [PMID: 31048268 DOI: 10.1016/j.jneuroim.2019.04.012] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 04/05/2019] [Accepted: 04/23/2019] [Indexed: 01/17/2023]
Abstract
The α7 nicotinic acetylcholine receptor (CHRNA7) modulates the inflammatory response by activating the cholinergic anti-inflammatory pathway. CHRFAM7A, the human-restricted duplicated form of CHRNA7, has a negative effect on the functioning of α7 receptors, suggesting that CHRFAM7A expression regulation may be a key step in the modulation of inflammation in the human setting. The analysis of the CHRFAM7A gene's regulatory region reveals some of the mechanisms driving its expression and responsiveness to LPS in human immune cell models. Moreover, given the immunomodulatory potential of donepezil we show that it differently modulates CHRFAM7A and CHRNA7 responsiveness to LPS, thus contributing to its therapeutic potential.
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Affiliation(s)
- Annalisa Maroli
- Dept. of Medical Biotechnology and Translational Medicine (BIOMETRA), Università degli Studi di Milano, via Vanvitelli, 20129 Milan, Italy
| | - Simona Di Lascio
- Dept. of Medical Biotechnology and Translational Medicine (BIOMETRA), Università degli Studi di Milano, via Vanvitelli, 20129 Milan, Italy
| | - Lorenzo Drufuca
- Dept. of Medical Biotechnology and Translational Medicine (BIOMETRA), Università degli Studi di Milano, via Vanvitelli, 20129 Milan, Italy; Humanitas Clinical and Research Centre, Rozzano, Italy
| | - Silvia Cardani
- Dept. of Medical Biotechnology and Translational Medicine (BIOMETRA), Università degli Studi di Milano, via Vanvitelli, 20129 Milan, Italy
| | - Elisa Setten
- Dept. of Medical Biotechnology and Translational Medicine (BIOMETRA), Università degli Studi di Milano, via Vanvitelli, 20129 Milan, Italy; Humanitas Clinical and Research Centre, Rozzano, Italy
| | - Massimo Locati
- Dept. of Medical Biotechnology and Translational Medicine (BIOMETRA), Università degli Studi di Milano, via Vanvitelli, 20129 Milan, Italy; Humanitas Clinical and Research Centre, Rozzano, Italy
| | - Diego Fornasari
- Dept. of Medical Biotechnology and Translational Medicine (BIOMETRA), Università degli Studi di Milano, via Vanvitelli, 20129 Milan, Italy; CNR -Neuroscience Institute, via Vanvitelli 32, 20129 Milan, Italy
| | - Roberta Benfante
- Dept. of Medical Biotechnology and Translational Medicine (BIOMETRA), Università degli Studi di Milano, via Vanvitelli, 20129 Milan, Italy; CNR -Neuroscience Institute, via Vanvitelli 32, 20129 Milan, Italy.
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5
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Garg BK, Loring RH. GTS-21 has cell-specific anti-inflammatory effects independent of α7 nicotinic acetylcholine receptors. PLoS One 2019; 14:e0214942. [PMID: 30947238 PMCID: PMC6448884 DOI: 10.1371/journal.pone.0214942] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 03/22/2019] [Indexed: 12/15/2022] Open
Abstract
α7 Nicotinic acetylcholine receptors (nAChRs) reportedly reduce inflammation by blocking effects of the important pro-inflammatory transcription factor, nuclear factor kappa-light chain-enhancer of B cells (NFκB). The α7 nAChR partial agonist GTS-21 reduces secretion of pro-inflammatory cytokines including interleukin-6 (IL6) and tumor-necrosis factor (TNF) in models of endotoxemia and sepsis, and its anti-inflammatory effects are widely ascribed to α7 nAChR activation. However, mechanistic details of α7 nAChR involvement in GTS-21 effects on inflammatory pathways remain unclear. Here, we investigate how GTS-21 acts in two cell systems including the non-immune rat pituitary cell line GH4C1 expressing an NFκB-driven reporter gene and cytokine secretion by ex vivo cultures of primary mouse macrophages activated by lipopolysaccharide (LPS). GTS-21 does not change TNF-stimulated NFκB signaling in GH4C1 cells expressing rat α7 nAChRs, suggesting that GTS-21 requires additional unidentified factors besides α7 nAChR expression to allow anti-inflammatory effects in these cells. In contrast, GTS-21 dose-dependently suppresses LPS-induced IL6 and TNF secretion in primary mouse macrophages endogenously expressing α7 nAChRs. GTS-21 also blocks TNF-induced phosphorylation of NFκB inhibitor alpha (IκBα), an important intermediary in NFκB signaling. However, α7 antagonists methyllycaconitine and α-bungarotoxin only partially reverse GTS-21 blockade of IL6 and TNF secretion. Further, GTS-21 significantly inhibited LPS-induced IL6 and TNF secretion in macrophages isolated from knockout mice lacking α7 nAChRs. These data indicate that even though a discrete component of the anti-inflammatory effects of GTS-21 requires expression of α7 nAChRs in macrophages, GTS-21 also has anti-inflammatory effects independent of these receptors depending on the cellular context.
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Affiliation(s)
- Brijesh K. Garg
- Department of Pharmaceutical Science, Northeastern University, Boston, Massachusetts, United States of America
| | - Ralph H. Loring
- Department of Pharmaceutical Science, Northeastern University, Boston, Massachusetts, United States of America
- * E-mail:
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6
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Sifat AE, Vaidya B, Kaisar MA, Cucullo L, Abbruscato TJ. Nicotine and electronic cigarette (E-Cig) exposure decreases brain glucose utilization in ischemic stroke. J Neurochem 2018; 147:204-221. [PMID: 30062776 PMCID: PMC6394831 DOI: 10.1111/jnc.14561] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [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: 04/28/2018] [Revised: 06/27/2018] [Accepted: 07/19/2018] [Indexed: 12/22/2022]
Abstract
Previous studies in our laboratory have shown that nicotine exposure decreases glucose transport across the blood-brain barrier in ischemia-reperfusion conditions. We hypothesize that nicotine can also dysregulate brain parenchymal glucose utilization by altering glucose transporters with effects on sensitivity to ischemic stroke. In this study, we investigated the effects of nicotine exposure on neuronal glucose utilization using an in vitro ischemic stroke model. We also tested the effects of e-Cig vaping on ischemic brain glucose utilization using an acute brain slice technique. Primary cortical neurons and brain slices were subjected to oxygen-glucose deprivation followed by reoxygenation to mimic ischemia-reperfusion injury. We estimated brain cell glucose utilization by measuring the uptake of [3 H] deoxy-d-glucose. Immunofluorescence and western blotting were done to characterize glucose transporters (GLUTs) and α7 nicotinic acetylcholine receptor (nAChR) expression. Furthermore, we used a glycolytic stress test to measure the effects of nicotine exposure on neuronal glucose metabolism. We observed that short- and long-term nicotine/cotinine exposure significantly decreased neuronal glucose utilization in ischemic conditions and the non-specific nAChR antagonist, mecamylamine reversed this effect. Nicotine/cotinine exposure also decreased neuronal GLUT1 and up-regulated α7 nAChR expression and decreased glycolysis. Exposure of mice to e-Cig vapor for 7 days likewise decreases brain glucose uptake under normoxic and ischemic conditions along with down-regulation of GLUT1 and GLUT3 expressions. These data support, from a cerebrovascular perspective, that nicotine and/or e-Cig vaping induce a state of glucose deprivation at the neurovascular unit which could lead to enhanced ischemic brain injury and/or stroke risk. OPEN PRACTICES: Open Science: This manuscript was awarded with the Open Materials Badge. For more information see: https://cos.io/our-services/open-science-badges/.
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Affiliation(s)
- Ali E Sifat
- Department of Pharmaceutical Sciences, School of Pharmacy, Texas Tech University Health Sciences Center, Amarillo, Texas, USA
| | - Bhuvaneshwar Vaidya
- Department of Pharmaceutical Sciences, School of Pharmacy, Texas Tech University Health Sciences Center, Amarillo, Texas, USA
| | - Mohammad A Kaisar
- Department of Pharmaceutical Sciences, School of Pharmacy, Texas Tech University Health Sciences Center, Amarillo, Texas, USA
| | - Luca Cucullo
- Department of Pharmaceutical Sciences, School of Pharmacy, Texas Tech University Health Sciences Center, Amarillo, Texas, USA
| | - Thomas J Abbruscato
- Department of Pharmaceutical Sciences, School of Pharmacy, Texas Tech University Health Sciences Center, Amarillo, Texas, USA
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7
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Nebrisi EE, Al Kury LT, Yang KHS, Jayaprakash P, Howarth FC, Kabbani N, Oz M. Curcumin potentiates the function of human α 7-nicotinic acetylcholine receptors expressed in SH-EP1 cells. Neurochem Int 2018; 114:80-84. [PMID: 29341902 DOI: 10.1016/j.neuint.2017.12.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 12/18/2017] [Accepted: 12/22/2017] [Indexed: 12/22/2022]
Abstract
Effects of curcumin, a biologically active ingredient of turmeric, were tested on the Ca2+ transients induced by the activation of α7 subunit of the human nicotinic acetylcholine (α7 nACh) receptor expressed in SH-EP1 cells. Curcumin caused a significant potentiation of choline (1 mM)-induced Ca2+ transients with an EC50 value of 133 nM. The potentiating effect of curcumin was not observed in Ca2+ transients induced by high K+ (60 mM) containing solutions or activation of α4β2 nACh receptors and the extent of curcumin potentiation was not altered in the presence of Ca2+ channel antagonists nifedipine (1 μM), verapamil (1 μM), ω-conotoxin (1 μM), and bepridil (10 μM). Noticeably the effect of curcumin was not observed when curcumin and choline were co-applied without curcumin pre-incubation. The effect of curcumin on choline-induced Ca2+ transients was not reversed by pre-incubation with inhibitors of protein C, A, and CaM kinases. Metabolites of curcumin such as tetrahydrocurcumin, demethylcurcumin, and didemethylcurcumin also caused potentiation of choline-induced Ca2+ transients. Notably, specific binding of [125I]-bungarotoxin was not altered in the presence of curcumin. Collectively, our results indicate that curcumin allosterically potentiate the function of the α7-nACh receptor expressed in SH-EP1 cells.
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Affiliation(s)
- Eslam El Nebrisi
- Department of Pharmacology, College of Medicine and Health Sciences, UAE University, Al Ain, United Arab Emirates
| | - Lina T Al Kury
- Department of Health Sciences, College of Natural and Health Sciences, Zayed University, Abu Dhabi, United Arab Emirates
| | - Keun-Hang Susan Yang
- Department of Biological Sciences, Schmid College of Science and Technology, Chapman University, One University Drive, Orange, CA 92866, USA
| | - Petrilla Jayaprakash
- Department of Pharmacology, College of Medicine and Health Sciences, UAE University, Al Ain, United Arab Emirates
| | - Frank C Howarth
- Department of Physiology, College of Medicine and Health Sciences, UAE University, Al Ain, United Arab Emirates
| | - Nadine Kabbani
- School of Systems Biology, Krasnow Institute for Advanced Study, George Mason University, 4400 University Drive, Fairfax, VA 22030, USA
| | - Murat Oz
- Department of Pharmacology, College of Medicine and Health Sciences, UAE University, Al Ain, United Arab Emirates; Department of Basic Medical Sciences, College of Medicine, Qatar University, Doha, Qatar.
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8
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Harwani SC, Ratcliff J, Sutterwala FS, Ballas ZK, Meyerholz DK, Chapleau MW, Abboud FM. Nicotine Mediates CD161a+ Renal Macrophage Infiltration and Premature Hypertension in the Spontaneously Hypertensive Rat. Circ Res 2016; 119:1101-1115. [PMID: 27660287 PMCID: PMC5085865 DOI: 10.1161/circresaha.116.309402] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Accepted: 09/22/2016] [Indexed: 02/06/2023]
Abstract
RATIONALE Renal inflammation contributes to the pathophysiology of hypertension. CD161a+ immune cells are dominant in the (SHR) spontaneously hypertensive rat and expand in response to nicotinic cholinergic activation. OBJECTIVE We aimed to phenotype CD161a+ immune cells in prehypertensive SHR after cholinergic activation with nicotine and determine if these cells are involved in renal inflammation and the development of hypertension. METHODS AND RESULTS Studies used young SHR and WKY (Wistar-Kyoto) rats. Splenocytes and bone marrow cells were exposed to nicotine ex vivo, and nicotine was infused in vivo. Blood pressures, kidney, serum, and urine were obtained. Flow cytometry, Luminex/ELISA, immunohistochemistry, confocal microscopy, and Western blot were used. Nicotinic cholinergic activation induced proliferation of CD161a+/CD68+ macrophages in SHR-derived splenocytes, their renal infiltration, and premature hypertension in SHR. These changes were associated with increased renal expression of MCP-1 (monocyte chemoattractant protein-1) and VLA-4 (very-late antigen-4). LLT1 (lectin-like transcript 1), the ligand for CD161a, was overexpressed in SHR kidney, whereas vascular cellular and intracellular adhesion molecules were similar to those in WKY. Inflammatory cytokines were elevated in SHR kidney and urine after nicotine infusion. Nicotine-mediated renal macrophage infiltration/inflammation was enhanced in denervated kidneys, not explained by angiotensin II levels or expression of angiotensin type-1/2 receptors. Moreover, expression of the anti-inflammatory α7-nAChR (α7-nicotinic acetylcholine receptor) was similar in young SHR and WKY rats. CONCLUSIONS A novel, inherited nicotinic cholinergic inflammatory effect exists in young SHR, measured by expansion of CD161a+/CD68+ macrophages. This leads to renal inflammation and premature hypertension, which may be partially explained by increased renal expression of LLT-1, MCP-1, and VLA-4.
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MESH Headings
- Age of Onset
- Angiotensin II/metabolism
- Animals
- Antigens, CD/analysis
- Antigens, Differentiation, Myelomonocytic/analysis
- Cell Movement/drug effects
- Cells, Cultured
- Chemokine CCL2/biosynthesis
- Chemokine CCL2/genetics
- Cytokines/biosynthesis
- Cytokines/genetics
- Denervation
- Gene Expression Regulation/drug effects
- Hypertension/etiology
- Hypertension/genetics
- Hypertension/metabolism
- Hypertension/pathology
- Hypertension, Renal/etiology
- Hypertension, Renal/genetics
- Hypertension, Renal/metabolism
- Hypertension, Renal/pathology
- Immunophenotyping
- Integrin alpha4beta1/biosynthesis
- Integrin alpha4beta1/genetics
- Kidney/innervation
- Kidney/pathology
- Lectins/biosynthesis
- Lectins/genetics
- Macrophages/classification
- Macrophages/drug effects
- Macrophages/pathology
- Male
- NK Cell Lectin-Like Receptor Subfamily B/analysis
- Nephritis/chemically induced
- Nephritis/physiopathology
- Nicotine/pharmacology
- Nicotine/toxicity
- Norepinephrine/metabolism
- Prehypertension/etiology
- Prehypertension/genetics
- Prehypertension/pathology
- Rats
- Rats, Inbred SHR
- Rats, Inbred WKY
- Receptor, Angiotensin, Type 1/biosynthesis
- Receptor, Angiotensin, Type 1/genetics
- Receptor, Angiotensin, Type 2/biosynthesis
- Receptor, Angiotensin, Type 2/genetics
- alpha7 Nicotinic Acetylcholine Receptor/biosynthesis
- alpha7 Nicotinic Acetylcholine Receptor/genetics
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Affiliation(s)
- Sailesh C Harwani
- From the Department of Internal Medicine (S.C.H., J.R., F.S.S., Z.K.B., M.W.C., F.M.A.), Departments of Molecular Physiology and Biophysics (M.W.C., F.M.A.), and Veterans Affairs Medical Center (F.S.S., Z.K.B., M.W.C.), Iowa City; and Department of Pathology (D.K.M.), Inflammation Program, Department of Internal Medicine (F.S.S.), Center for Immunology and Immune Mediated Diseases (S.C.H., F.S.S., F.M.A.), and Abboud Cardiovascular Research Center (S.C.H., J.R., M.W.C., F.M.A.), University of Iowa Carver College of Medicine, Iowa City.
| | - Jason Ratcliff
- From the Department of Internal Medicine (S.C.H., J.R., F.S.S., Z.K.B., M.W.C., F.M.A.), Departments of Molecular Physiology and Biophysics (M.W.C., F.M.A.), and Veterans Affairs Medical Center (F.S.S., Z.K.B., M.W.C.), Iowa City; and Department of Pathology (D.K.M.), Inflammation Program, Department of Internal Medicine (F.S.S.), Center for Immunology and Immune Mediated Diseases (S.C.H., F.S.S., F.M.A.), and Abboud Cardiovascular Research Center (S.C.H., J.R., M.W.C., F.M.A.), University of Iowa Carver College of Medicine, Iowa City
| | - Fayyaz S Sutterwala
- From the Department of Internal Medicine (S.C.H., J.R., F.S.S., Z.K.B., M.W.C., F.M.A.), Departments of Molecular Physiology and Biophysics (M.W.C., F.M.A.), and Veterans Affairs Medical Center (F.S.S., Z.K.B., M.W.C.), Iowa City; and Department of Pathology (D.K.M.), Inflammation Program, Department of Internal Medicine (F.S.S.), Center for Immunology and Immune Mediated Diseases (S.C.H., F.S.S., F.M.A.), and Abboud Cardiovascular Research Center (S.C.H., J.R., M.W.C., F.M.A.), University of Iowa Carver College of Medicine, Iowa City
| | - Zuhair K Ballas
- From the Department of Internal Medicine (S.C.H., J.R., F.S.S., Z.K.B., M.W.C., F.M.A.), Departments of Molecular Physiology and Biophysics (M.W.C., F.M.A.), and Veterans Affairs Medical Center (F.S.S., Z.K.B., M.W.C.), Iowa City; and Department of Pathology (D.K.M.), Inflammation Program, Department of Internal Medicine (F.S.S.), Center for Immunology and Immune Mediated Diseases (S.C.H., F.S.S., F.M.A.), and Abboud Cardiovascular Research Center (S.C.H., J.R., M.W.C., F.M.A.), University of Iowa Carver College of Medicine, Iowa City
| | - David K Meyerholz
- From the Department of Internal Medicine (S.C.H., J.R., F.S.S., Z.K.B., M.W.C., F.M.A.), Departments of Molecular Physiology and Biophysics (M.W.C., F.M.A.), and Veterans Affairs Medical Center (F.S.S., Z.K.B., M.W.C.), Iowa City; and Department of Pathology (D.K.M.), Inflammation Program, Department of Internal Medicine (F.S.S.), Center for Immunology and Immune Mediated Diseases (S.C.H., F.S.S., F.M.A.), and Abboud Cardiovascular Research Center (S.C.H., J.R., M.W.C., F.M.A.), University of Iowa Carver College of Medicine, Iowa City
| | - Mark W Chapleau
- From the Department of Internal Medicine (S.C.H., J.R., F.S.S., Z.K.B., M.W.C., F.M.A.), Departments of Molecular Physiology and Biophysics (M.W.C., F.M.A.), and Veterans Affairs Medical Center (F.S.S., Z.K.B., M.W.C.), Iowa City; and Department of Pathology (D.K.M.), Inflammation Program, Department of Internal Medicine (F.S.S.), Center for Immunology and Immune Mediated Diseases (S.C.H., F.S.S., F.M.A.), and Abboud Cardiovascular Research Center (S.C.H., J.R., M.W.C., F.M.A.), University of Iowa Carver College of Medicine, Iowa City
| | - Francois M Abboud
- From the Department of Internal Medicine (S.C.H., J.R., F.S.S., Z.K.B., M.W.C., F.M.A.), Departments of Molecular Physiology and Biophysics (M.W.C., F.M.A.), and Veterans Affairs Medical Center (F.S.S., Z.K.B., M.W.C.), Iowa City; and Department of Pathology (D.K.M.), Inflammation Program, Department of Internal Medicine (F.S.S.), Center for Immunology and Immune Mediated Diseases (S.C.H., F.S.S., F.M.A.), and Abboud Cardiovascular Research Center (S.C.H., J.R., M.W.C., F.M.A.), University of Iowa Carver College of Medicine, Iowa City
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Schaal C, Chellappan S. Nicotine-Mediated Regulation of Nicotinic Acetylcholine Receptors in Non-Small Cell Lung Adenocarcinoma by E2F1 and STAT1 Transcription Factors. PLoS One 2016; 11:e0156451. [PMID: 27228072 PMCID: PMC4882068 DOI: 10.1371/journal.pone.0156451] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [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: 03/15/2016] [Accepted: 05/14/2016] [Indexed: 12/19/2022] Open
Abstract
Cigarette smoking is the major risk factor for non-small cell lung cancer (NSCLC), which accounts for 80% of all lung cancers. Nicotine, the addictive component of tobacco smoke, can induce proliferation, migration, invasion, epithelial-mesenchymal transition (EMT), angiogenesis, and survival in NSCLC cell lines, as well as growth and metastasis of NSCLC in mice. This nicotine-mediated tumor progression is facilitated through activation of nicotinic acetylcholine receptors (nAChRs), specifically the α7 subunit; however, how the α7 nAChR gene is regulated in lung adenocarcinoma is not fully clear. Here we demonstrate that the α7 nAChR gene promoter is differentially regulated by E2F and STAT transcription factors through a competitive interplay; E2F1 induces the promoter, while STAT transcription factors repress it by binding to an overlapping site at a region -294 through -463bp upstream of the transcription start site. Treatment of cells with nicotine induced the mRNA and protein levels of α7 nAChR; this could be abrogated by treatment with inhibitors targeting Src, PI3K, MEK, α7 nAChR, CDK4/6 or a disruptor of the Rb-Raf-1 interaction. Further, nicotine–mediated induction of α7 nAChR was reduced when E2F1 was depleted and in contrast elevated when STAT1 was depleted by siRNAs. Interestingly, extracts from e-cigarettes, which have recently emerged as healthier alternatives to traditional cigarette smoking, can also induce α7 nAChR expression in a manner similar to nicotine. These results suggest an autoregulatory feed-forward loop that induces the levels of α7 nAChR upon exposure to nicotine, which enhances the strength of the signal. It can be imagined that such an induction of α7 nAChR contributes to the tumor-promoting functions of nicotine.
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Affiliation(s)
- Courtney Schaal
- Department of Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida, United States of America
- Cancer Biology PhD Program, Department of Cell Biology, Microbiology, and Molecular Biology, University of South Florida, Tampa, Florida, United States of America
| | - Srikumar Chellappan
- Department of Tumor Biology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida, United States of America
- * E-mail:
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Schulz KM, Andrud KM, Burke MB, Pearson JN, Kreisler AD, Stevens KE, Leonard S, Adams CE. The effects of prenatal stress on alpha4 beta2 and alpha7 hippocampal nicotinic acetylcholine receptor levels in adult offspring. Dev Neurobiol 2013; 73:806-14. [PMID: 23749479 PMCID: PMC4438756 DOI: 10.1002/dneu.22097] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [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: 11/28/2012] [Revised: 04/26/2013] [Accepted: 05/20/2013] [Indexed: 12/17/2022]
Abstract
Prenatal stress in humans is associated with psychiatric problems in offspring such as anxiety, depression, and schizophrenia. These same illnesses are also associated with neuronal nicotinic acetylcholine receptor (nAChR) dysfunction. Despite the known associations between prenatal stress exposure and offspring mental illness, and between mental illness and nAChR dysfunction, it is not known whether prenatal stress exposure impacts neuronal nAChRs. Thus, we tested the hypothesis that maternal stress alters the development of hippocampal alpha4 beta2 (α4β2∗) and alpha7 (α7∗) nicotinic receptor levels in adult offspring. Female Sprague-Dawley rats experienced unpredictable variable stressors two to three times daily during the last week of gestation. At weaning (21 days) the offspring of prenatally stressed (PS) and nonstressed (NS) dams were assigned to same-sex PS or NS groups. In young adulthood (56 days), the brains of offspring were collected and adjacent sections processed for quantitative autoradiography using [125I]-epibatidine (α4β2* nicotinic receptor-selective) and [125I]-α-bungarotoxin (α-BTX; α7* nicotinic receptor-selective) ligands. We found that PS significantly increased hippocampal α4β2* nAChRs of males and females in all subfields analyzed. In contrast, only females showed a trend toward PS-induced increases in α7* nAChRs in the dentate gyrus. Interestingly, NS females displayed a significant left-biased lateralization of α7* nAChRs in the laconosum moleculare of area CA1, whereas PS females did not, suggesting that PS interfered with normal lateralization patterns of α7* nAChRs during development. Taken together, our results suggest that PS impacts the development of hippocampal nAChRs, which may be an important link between PS exposure and risk for neuropsychiatric illness.
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Affiliation(s)
- Kalynn M Schulz
- Veterans Affairs Medical Center, Denver, Colorado; Department of Psychiatry, University of Colorado Anschutz Medical Campus, Colorado
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