Abstract
The signaling axis of glucagon-like peptide-1 (GLP-1)/GLP-1 receptor (GLP-1R) has been an important component in overcoming diabetes, and recent reports have uncovered novel beneficial roles of this signaling axis in central nervous system (CNS) disorders, such as Alzheimer’s disease, Parkinson’s disease, and cerebral ischemia, accelerating processes for exendin-4 repositioning. Here, we studied whether multiple sclerosis (MS) could be a complement to the CNS disorders that are associated with the GLP-1/GLP-1R signaling axis. Both components of the signaling axis, GLP-1 and GLP-1R proteins, are expressed in neurons, astrocytes, and microglia in the spinal cord of normal mice. In particular, they are abundant in Iba1-positive microglia. Upon challenge by experimental autoimmune encephalomyelitis (EAE), an animal model of MS, the mRNA expression of both GLP-1 and GLP-1R was markedly downregulated in EAE-symptomatic spinal cords, indicating attenuated activity of GLP-1/GLP-1R signaling in EAE. Such a downregulation obviously occurred in LPS-stimulated rat primary microglia, a main cell type to express both GLP-1 and GLP-1R, further indicating attenuated activity of GLP-1/GLP-1R signaling in activated microglia. To investigate whether increased activity of GLP-1R has a therapeutic benefit, exendin-4 (5 μg/kg, i.p.), a GLP-1R agonist, was administered daily to EAE-symptomatic mice. Exendin-4 administration to symptomatic EAE mice significantly improved the clinical signs of the disease, along with the reversal of histopathological sequelae such as cell accumulation, demyelination, astrogliosis, microglial activation, and morphological transformation of activated microglia in the injured spinal cord. Such an improvement by exendin-4 was comparable to that by FTY720 (3 mg/kg, i.p.), a drug for MS. The neuroprotective effects of exendin-4 against EAE were also associated with decreased mRNA expression of proinflammatory cytokines, such as interleukin (IL)-17, IL-1β, IL-6, and tumor necrosis factor (TNF)-α, all of which are usually upregulated in injured sites of the EAE spinal cord. Interestingly, exendin-4 exposure similarly reduced mRNA levels of IL-1β and TNF-α in LPS-stimulated microglia. Furthermore, exendin-4 administration significantly attenuated activation of NF-κB signaling in EAE spinal cord and LPS-stimulated microglia. Collectively, the current study demonstrates the therapeutic potential of exendin-4 for MS by reducing immune responses in the CNS, highlighting the importance of the GLP-1/GLP-1R signaling axis in the development of a novel therapeutic strategy for MS.
Similar content being viewed by others
References
Ahren B, Schmitz O (2004) GLP-1 receptor agonists and DPP-4 inhibitors in the treatment of type 2 diabetes. Horm Metab Res 36(11–12):867–876
Bond A (2006) Exenatide (Byetta) as a novel treatment option for type 2 diabetes mellitus. PRO 19(3):281–284
Larsen PJ, Tang-Christensen M, Holst JJ, Orskov C (1997) Distribution of glucagon-like peptide-1 and other preproglucagon-derived peptides in the rat hypothalamus and brainstem. Neuroscience 77(1):257–270
Jin SL, Han VK, Simmons JG, Towle AC, Lauder JM, Lund PK (1988) Distribution of glucagonlike peptide I (GLP-I), glucagon, and glicentin in the rat brain: an immunocytochemical study. J Comp Neurol 271(4):519–532
Holscher C (2014) Central effects of GLP-1: new opportunities for treatments of neurodegenerative diseases. J Endocrinol 221(1):T31–T41
Qin Z, Sun Z, Huang J, Hu Y, Wu Z, Mei B (2008) Mutated recombinant human glucagon-like peptide-1 protects SH-SY5Y cells from apoptosis induced by amyloid-beta peptide (1-42). Neurosci Lett 444(3):217–221
Iwai T, Ito S, Tanimitsu K, Udagawa S, Oka J (2006) Glucagon-like peptide-1 inhibits LPS-induced IL-1beta production in cultured rat astrocytes. Neurosci Res 55(4):352–360
Kumar G, Iadav RS (2012) Induction of cytomixis affects microsporogenesis in Sesamum indicum L. (Pedaliaceae). Ontogenez 43(4):261–267
During MJ, Cao L, Zuzga DS, Francis JS, Fitzsimons HL, Jiao X, Bland RJ, Klugmann M et al (2003) Glucagon-like peptide-1 receptor is involved in learning and neuroprotection. Nat Med 9(9):1173–1179
Bassil F, Fernagut PO, Bezard E, Meissner WG (2014) Insulin, IGF-1 and GLP-1 signaling in neurodegenerative disorders: targets for disease modification? Prog Neurobiol 118:1–18
Rampersaud N, Harkavyi A, Giordano G, Lever R, Whitton J, Whitton P (2012) Exendin-4 reverts behavioural and neurochemical dysfunction in a pre-motor rodent model of Parkinson's disease with noradrenergic deficit. Br J Pharmacol 167(7):1467–1479
Li Y, Chigurupati S, Holloway HW, Mughal M, Tweedie D, Bruestle DA, Mattson MP, Wang Y et al (2012) Exendin-4 ameliorates motor neuron degeneration in cellular and animal models of amyotrophic lateral sclerosis. PLoS One 7(2):e32008
Chen S, Liu AR, An FM, Yao WB, Gao XD (2012) Amelioration of neurodegenerative changes in cellular and rat models of diabetes-related Alzheimer’s disease by exendin-4. Age (Dordr) 34(5):1211–1224
Eakin K, Li Y, Chiang YH, Hoffer BJ, Rosenheim H, Greig NH, Miller JP (2013) Exendin-4 ameliorates traumatic brain injury-induced cognitive impairment in rats. PLoS One 8(12):e82016
Kim S, Moon M, Park S (2009) Exendin-4 protects dopaminergic neurons by inhibition of microglial activation and matrix metalloproteinase-3 expression in an animal model of Parkinson’s disease. J Endocrinol 202(3):431–439
Darsalia V, Mansouri S, Ortsater H, Olverling A, Nozadze N, Kappe C, Iverfeldt K, Tracy LM et al (2012) Glucagon-like peptide-1 receptor activation reduces ischaemic brain damage following stroke in type 2 diabetic rats. Clin Sci 122(10):473–483
Munoz-Culla M, Irizar H, Otaegui D (2013) The genetics of multiple sclerosis: review of current and emerging candidates. Appl Clin Genet 6:63–73
Minagar A, Shapshak P, Fujimura R, Ownby R, Heyes M, Eisdorfer C (2002) The role of macrophage/microglia and astrocytes in the pathogenesis of three neurologic disorders: HIV-associated dementia, Alzheimer disease, and multiple sclerosis. J Neurol Sci 202(1–2):13–23
di Penta A, Moreno B, Reix S, Fernandez-Diez B, Villanueva M, Errea O, Escala N, Vandenbroeck K et al (2013) Oxidative stress and proinflammatory cytokines contribute to demyelination and axonal damage in a cerebellar culture model of neuroinflammation. PLoS One 8(2):e54722
Renno T, Krakowski M, Piccirillo C, Lin JY, Owens T (1995) TNF-alpha expression by resident microglia and infiltrating leukocytes in the central nervous system of mice with experimental allergic encephalomyelitis. Regulation by Th1 cytokines. J Immunol 154(2):944–953
Rasmussen S, Imitola J, Ayuso-Sacido A, Wang Y, Starossom SC, Kivisakk P, Zhu B, Meyer M et al (2011) Reversible neural stem cell niche dysfunction in a model of multiple sclerosis. Ann Neurol 69(5):878–891
Popovic N, Schubart A, Goetz BD, Zhang SC, Linington C, Duncan ID (2002) Inhibition of autoimmune encephalomyelitis by a tetracycline. Ann Neurol 51(2):215–223
Choi JW, Gardell SE, Herr DR, Rivera R, Lee CW, Noguchi K, Teo ST, Yung YC et al (2011) FTY720 (fingolimod) efficacy in an animal model of multiple sclerosis requires astrocyte sphingosine 1-phosphate receptor 1 (S1P1) modulation. P Natl Acad Sci USA 108(2):751–756
Jackson SJ, Giovannoni G, Baker D (2011) Fingolimod modulates microglial activation to augment markers of remyelination. J Neuroinflamm 8:76
Gong N, Xiao Q, Zhu B, Zhang CY, Wang YC, Fan H, Ma AN, Wang YX (2014) Activation of spinal glucagon-like peptide-1 receptors specifically suppresses pain hypersensitivity. J Neurosci 34(15):5322–5334
Kappe C, Tracy LM, Patrone C, Iverfeldt K, Sjoholm A (2012) GLP-1 secretion by microglial cells and decreased CNS expression in obesity. J Neuroinflamm 9:276
Darsalia V, Hua S, Larsson M, Mallard C, Nathanson D, Nystrom T, Sjoholm A, Johansson ME et al (2014) Exendin-4 reduces ischemic brain injury in normal and aged type 2 diabetic mice and promotes microglial M2 polarization. PLoS One 9(8):e103114
Sharma A, Sorenby A, Wernerson A, Efendic S, Kumagai-Braesch M, Tibell A (2006) Exendin-4 treatment improves metabolic control after rat islet transplantation to athymic mice with streptozotocin-induced diabetes. Diabetologia 49(6):1247–1253
Gaire BP, Kwon OW, Park SH, Chun KH, Kim SY, Shin DY, Choi JW (2015) Neuroprotective effect of 6-paradol in focal cerebral ischemia involves the attenuation of neuroinflammatory responses in activated microglia. PLoS One 10(3):e0120203
Gao Z, Tsirka SE (2011) Animal models of MS reveal multiple roles of microglia in disease pathogenesis. Neurol Res Int 2011:383087
Han MH, Hwang SI, Roy DB, Lundgren DH, Price JV, Ousman SS, Fernald GH, Gerlitz B et al (2008) Proteomic analysis of active multiple sclerosis lesions reveals therapeutic targets. Nature 451(7182):1076–1081
Lock C, Hermans G, Pedotti R, Brendolan A, Schadt E, Garren H, Langer-Gould A, Strober S et al (2002) Gene-microarray analysis of multiple sclerosis lesions yields new targets validated in autoimmune encephalomyelitis. Nat Med 8(5):500–508
Mc Guire C, Prinz M, Beyaert R, van Loo G (2013) Nuclear factor kappa B (NF-kappaB) in multiple sclerosis pathology. Trends Mol Med 19(10):604–613
Hoesel B, Schmid JA (2013) The complexity of NF-kappaB signaling in inflammation and cancer. Mol Cancer 12:86
Campos RV, Lee YC, Drucker DJ (1994) Divergent tissue-specific and developmental expression of receptors for glucagon and glucagon-like peptide-1 in the mouse. Endocrinology 134(5):2156–2164
Kagansky N, Levy S, Knobler H (2001) The role of hyperglycemia in acute stroke. Arch Neurol 58(8):1209–1212
Li Y, Tweedie D, Mattson MP, Holloway HW, Greig NH (2010) Enhancing the GLP-1 receptor signaling pathway leads to proliferation and neuroprotection in human neuroblastoma cells. J Neurochem 113(6):1621–1631
Perry T, Holloway HW, Weerasuriya A, Mouton PR, Duffy K, Mattison JA, Greig NH (2007) Evidence of GLP-1-mediated neuroprotection in an animal model of pyridoxine-induced peripheral sensory neuropathy. Exp Neurol 203(2):293–301
Cork SC, Richards JE, Holt MK, Gribble FM, Reimann F, Trapp S (2015) Distribution and characterisation of glucagon-like peptide-1 receptor expressing cells in the mouse brain. Mol Metab 4(10):718–731
Chowen JA, de Fonseca FR, Alvarez E, Navarro M, Garcia-Segura LM, Blazquez E (1999) Increased glucagon-like peptide-1 receptor expression in glia after mechanical lesion of the rat brain. Neuropeptides 33(3):212–215
Darsalia V, Ortsater H, Olverling A, Darlof E, Wolbert P, Nystrom T, Klein T, Sjoholm A et al (2013) The DPP-4 inhibitor linagliptin counteracts stroke in the normal and diabetic mouse brain: a comparison with glimepiride. Diabetes 62(4):1289–1296
Hamilton A, Holscher C (2009) Receptors for the incretin glucagon-like peptide-1 are expressed on neurons in the central nervous system. Neuroreport 20(13):1161–1166
Li Y, Perry T, Kindy MS, Harvey BK, Tweedie D, Holloway HW, Powers K, Shen H et al (2009) GLP-1 receptor stimulation preserves primary cortical and dopaminergic neurons in cellular and rodent models of stroke and parkinsonism. P Natl Acad Sci USA 106(4):1285–1290
Teramoto S, Miyamoto N, Yatomi K, Tanaka Y, Oishi H, Arai H, Hattori N, Urabe T (2011) Exendin-4, a glucagon-like peptide-1 receptor agonist, provides neuroprotection in mice transient focal cerebral ischemia. J Cerebr Blood F Met 31(8):1696–1705
Lee CH, Yan B, Yoo KY, Choi JH, Kwon SH, Her S, Sohn Y, Hwang IK et al (2011) Ischemia-induced changes in glucagon-like peptide-1 receptor and neuroprotective effect of its agonist, exendin-4, in experimental transient cerebral ischemia. J Neurosci Res 89(7):1103–1113
Ohshima RHK, Holsher C, Seki K (2015) Age-related decrease in glucagon- like peptide-1 in mouse prefrontal cortext but not in hippocampus despite the preservation of its receptor. Am J BioScience 1:11–27
Lee J, Hong SW, Chae SW, Kim DH, Choi JH, Bae JC, Park SE, Rhee EJ et al (2012) Exendin-4 improves steatohepatitis by increasing Sirt1 expression in high-fat diet-induced obese C57BL/6J mice. PLoS One 7(2):e31394
Foster CA, Mechtcheriakova D, Storch MK, Balatoni B, Howard LM, Bornancin F, Wlachos A, Sobanov J et al (2009) FTY720 rescue therapy in the dark agouti rat model of experimental autoimmune encephalomyelitis: expression of central nervous system genes and reversal of blood-brain-barrier damage. Brain Pathol 19(2):254–266
McClean PL, Parthsarathy V, Faivre E, Holscher C (2011) The diabetes drug liraglutide prevents degenerative processes in a mouse model of Alzheimer's disease. J Neurosci 31(17):6587–6594
Himeno T, Kamiya H, Naruse K, Harada N, Ozaki N, Seino Y, Shibata T, Kondo M et al (2011) Beneficial effects of exendin-4 on experimental polyneuropathy in diabetic mice. Diabetes 60(9):2397–2406
Iwai T, Sawabe T, Tanimitsu K, Suzuki M, Sasaki-Hamada S, Oka J (2014) Glucagon-like peptide-1 protects synaptic and learning functions from neuroinflammation in rodents. J Neurosci Res 92(4):446–454
Parthsarathy V, Holscher C (2013) The type 2 diabetes drug liraglutide reduces chronic inflammation induced by irradiation in the mouse brain. Eur J Pharmacol 700(1–3):42–50
Kuroki T, Tanaka R, Shimada Y, Yamashiro K, Ueno Y, Shimura H, Urabe T, Hattori N (2016) Exendin-4 inhibits matrix metalloproteinase-9 activation and reduces infarct growth after focal cerebral ischemia in hyperglycemic mice. Stroke 47(5):1328–1335
Tam WY, Ma CH (2014) Bipolar/rod-shaped microglia are proliferating microglia with distinct M1/M2 phenotypes. Sci Rep-UK 4:7279
Crain JM, Nikodemova M, Watters JJ (2013) Microglia express distinct M1 and M2 phenotypic markers in the postnatal and adult central nervous system in male and female mice. J Neurosci Res 91(9):1143–1151
Xia CY, Zhang S, Gao Y, Wang ZZ, Chen NH (2015) Selective modulation of microglia polarization to M2 phenotype for stroke treatment. Int Immunopharmacol 25(2):377–382
Ponomarev ED, Shriver LP, Maresz K, Dittel BN (2005) Microglial cell activation and proliferation precedes the onset of CNS autoimmunity. J Neurosci Res 81(3):374–389
Guo C, Huang T, Chen A, Chen X, Wang L, Shen F, Gu X (2016) Glucagon-like peptide 1 improves insulin resistance in vitro through anti-inflammation of macrophages. Braz J Med Biol Res 49(12):e5826
Lee YS, Jun HS (2016) Anti-inflammatory effects of GLP-1-based therapies beyond glucose control. Mediat Inflamm 2016:3094642
Jia Y, Jing J, Bai Y, Li Z, Liu L, Luo J, Liu M, Chen H (2011) Amelioration of experimental autoimmune encephalomyelitis by plumbagin through down-regulation of JAK-STAT and NF-kappaB signaling pathways. PLoS One 6(10):e27006
Yin QQ, Liu CX, Wu YL, Wu SF, Wang Y, Zhang X, Hu XJ, Pu JX et al (2013) Preventive and therapeutic effects of adenanthin on experimental autoimmune encephalomyelitis by inhibiting NF-kappaB signaling. J Immunol 191(5):2115–2125
Acknowledgements
This work was supported by grants from the National Research Foundation (NRF) and Ministry of Health and Welfare funded by the Korean Government to JWC [NRF-2013R1A1A1A05005520 and NRF-2014M3A9B6069339] and HSJ [HI14C1135]. The authors thank Mr. Bhakta Prasad Gaire for technical assistance with histological analysis.
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflicts of Interest
The authors declare that they have no conflict of interest.
Additional information
Chi-Ho Lee, Se Jin Jeon, and Kyu Suk Cho contribute equally to this study.
Electronic Supplementary Material
ESM 1
(DOCX 1980 kb)
Rights and permissions
About this article
Cite this article
Lee, CH., Jeon, S.J., Cho, K.S. et al. Activation of Glucagon-Like Peptide-1 Receptor Promotes Neuroprotection in Experimental Autoimmune Encephalomyelitis by Reducing Neuroinflammatory Responses. Mol Neurobiol 55, 3007–3020 (2018). https://doi.org/10.1007/s12035-017-0550-2
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12035-017-0550-2