1
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Rinaldi C, Waters CS, Li Z, Kumbier K, Rao L, Nichols RJ, Jacobson MP, Wu LF, Altschuler SJ. Dissecting the effects of GTPase and kinase domain mutations on LRRK2 endosomal localization and activity. Cell Rep 2023; 42:112447. [PMID: 37141099 DOI: 10.1016/j.celrep.2023.112447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 03/21/2023] [Accepted: 04/13/2023] [Indexed: 05/05/2023] Open
Abstract
Parkinson's disease-causing leucine-rich repeat kinase 2 (LRRK2) mutations lead to varying degrees of Rab GTPase hyperphosphorylation. Puzzlingly, LRRK2 GTPase-inactivating mutations-which do not affect intrinsic kinase activity-lead to higher levels of cellular Rab phosphorylation than kinase-activating mutations. Here, we investigate whether mutation-dependent differences in LRRK2 cellular localization could explain this discrepancy. We discover that blocking endosomal maturation leads to the rapid formation of mutant LRRK2+ endosomes on which LRRK2 phosphorylates substrate Rabs. LRRK2+ endosomes are maintained through positive feedback, which mutually reinforces membrane localization of LRRK2 and phosphorylated Rab substrates. Furthermore, across a panel of mutants, cells expressing GTPase-inactivating mutants form strikingly more LRRK2+ endosomes than cells expressing kinase-activating mutants, resulting in higher total cellular levels of phosphorylated Rabs. Our study suggests that the increased probability that LRRK2 GTPase-inactivating mutants are retained on intracellular membranes compared to kinase-activating mutants leads to higher substrate phosphorylation.
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Affiliation(s)
- Capria Rinaldi
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Christopher S Waters
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Zizheng Li
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Karl Kumbier
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Lee Rao
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, CA 94158, USA
| | - R Jeremy Nichols
- Department of Pathology, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, USA
| | - Matthew P Jacobson
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Lani F Wu
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, CA 94158, USA.
| | - Steven J Altschuler
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, CA 94158, USA.
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2
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Tang X, Xing S, Ma M, Xu Z, Guan Q, Chen Y, Feng F, Liu W, Chen T, Chen Y, Sun H. The Development and Design Strategy of Leucine-Rich Repeat Kinase 2 Inhibitors: Promising Therapeutic Agents for Parkinson's Disease. J Med Chem 2023; 66:2282-2307. [PMID: 36758171 DOI: 10.1021/acs.jmedchem.2c01552] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
Parkinson's disease (PD) is a progressive neurodegenerative disorder affecting millions of people worldwide. Mutations in the gene encoding leucine-rich repeat kinase 2 (LRRK2) are the most common genetic risk factor for PD. Elevated LRRK2 kinase activity is found in idiopathic and familial PD cases. LRRK2 mutations are involved in multiple PD pathogeneses, including dysregulation of mitochondrial homeostasis, ciliogenesis, etc. Here, we provide a comprehensive overview of the biological function, structure, and mutations of LRRK2. We also examine recent advances and challenges in developing LRRK2 inhibitors and address prospective protein-based targeting strategies. The binding mechanisms, structure-activity relationships, and pharmacokinetic features of inhibitors are emphasized to provide a comprehensive compendium on the rational design of LRRK2 inhibitors. We hope that this publication can serve as a guide for designing novel LRRK2 inhibitors based on the summarized facts and perspectives.
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Affiliation(s)
- Xu Tang
- School of Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Shuaishuai Xing
- School of Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Mingkang Ma
- School of Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Ziwei Xu
- School of Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Qianwen Guan
- School of Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Yuting Chen
- School of Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Feng Feng
- Department of Natural Medicinal Chemistry, China Pharmaceutical University, Nanjing 211198, People's Republic of China
- Jiangsu Food and Pharmaceuticals Science College, Institute of Food and Pharmaceuticals Research, Huai'an 223005, People's Republic of China
| | - Wenyuan Liu
- School of Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Tingkai Chen
- School of Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Yao Chen
- School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, People's Republic of China
| | - Haopeng Sun
- School of Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
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3
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Alterations in the LRRK2-Rab pathway in urinary extracellular vesicles as Parkinson's disease and pharmacodynamic biomarkers. NPJ Parkinsons Dis 2023; 9:21. [PMID: 36750568 PMCID: PMC9905493 DOI: 10.1038/s41531-023-00445-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 01/05/2023] [Indexed: 02/09/2023] Open
Abstract
Expression or phosphorylation levels of leucine-rich repeat kinase 2 (LRRK2) and its Rab substrates have strong potential as disease or pharmacodynamic biomarkers. The main objective of this study is therefore to assess the LRRK2-Rab pathway for use as biomarkers in human, non-human primate (NHP) and rat urine. With urine collected from human subjects and animals, we applied an ultracentrifugation based fractionation protocol to isolate small urinary extracellular vesicles (uEVs). We used western blot with antibodies directed against total and phosphorylated LRRK2, Rab8, and Rab10 to measure these LRRK2 and Rab epitopes in uEVs. We confirm the presence of LRRK2 and Rab8/10 in human and NHP uEVs, including total LRRK2 as well as phospho-LRRK2, phospho-Rab8 and phospho-Rab10. We also confirm LRRK2 and Rab expression in rodent uEVs. We quantified LRRK2 and Rab epitopes in human cohorts and found in a first cohort that pS1292-LRRK2 levels were elevated in individuals carrying the LRRK2 G2019S mutation, without significant differences between healthy and PD groups, whether for LRRK2 G2019S carriers or not. In a second cohort, we found that PD was associated to increased Rab8 levels and decreased pS910-LRRK2 and pS935-LRRK2. In animals, acute treatment with LRRK2 kinase inhibitors led to decreased pT73-Rab10. The identification of changes in Rab8 and LRRK2 phosphorylation at S910 and S935 heterologous phosphosites in uEVs of PD patients and pT73-Rab10 in inhibitor-dosed animals further reinforces the potential of the LRRK2-Rab pathway as a source of PD and pharmacodynamic biomarkers in uEVs.
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4
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Ho PWL, Chang EES, Leung CT, Liu H, Malki Y, Pang SYY, Choi ZYK, Liang Y, Lai WS, Ruan Y, Leung KMY, Yung S, Mak JCW, Kung MHW, Ramsden DB, Ho SL. Long-term inhibition of mutant LRRK2 hyper-kinase activity reduced mouse brain α-synuclein oligomers without adverse effects. NPJ Parkinsons Dis 2022; 8:115. [PMID: 36088364 PMCID: PMC9464237 DOI: 10.1038/s41531-022-00386-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 08/30/2022] [Indexed: 11/30/2022] Open
Abstract
Parkinson’s disease (PD) is characterized by dopaminergic neurodegeneration in nigrostriatal and cortical brain regions associated with pathogenic α-synuclein (αSyn) aggregate/oligomer accumulation. LRRK2 hyperactivity is a disease-modifying therapeutic target in PD. However, LRRK2 inhibition may be associated with peripheral effects, albeit with unclear clinical consequences. Here, we significantly reduced αSyn oligomer accumulation in mouse striatum through long-term LRRK2 inhibition using GNE-7915 (specific brain-penetrant LRRK2 inhibitor) without causing adverse peripheral effects. GNE-7915 concentrations in wild-type (WT) mouse sera and brain samples reached a peak at 1 h, which gradually decreased over 24 h following a single subcutaneous (100 mg/kg) injection. The same dose in young WT and LRRK2R1441G mutant mice significantly inhibited LRRK2 kinase activity (Thr73-Rab10 and Ser106-Rab12 phosphorylation) in the lung, which dissipated by 72 h post-injection. 14-month-old mutant mice injected with GNE-7915 twice weekly for 18 weeks (equivalent to ~13 human years) exhibited reduced striatal αSyn oligomer and cortical pSer129-αSyn levels, correlating with inhibition of LRRK2 hyperactivity in brain and lung to WT levels. No GNE-7915-treated mice showed increased mortality or morbidity. Unlike reports of abnormalities in lung and kidney at acute high doses of LRRK2 inhibitors, our GNE-7915-treated mice did not exhibit swollen lamellar bodies in type II pneumocytes or abnormal vacuolation in the kidney. Functional and histopathological assessments of lung, kidney and liver, including whole-body plethysmography, urinary albumin-creatinine ratio (ACR), serum alanine aminotransferase (ALT) and serum interleukin-6 (inflammatory marker) did not reveal abnormalities after long-term GNE-7915 treatment. Long-term inhibition of mutant LRRK2 hyper-kinase activity to physiological levels presents an efficacious and safe disease-modifying therapy to ameliorate synucleinopathy in PD.
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5
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Coku I, Mutez E, Eddarkaoui S, Carrier S, Marchand A, Deldycke C, Goveas L, Baille G, Tir M, Magnez R, Thuru X, Vermeersch G, Vandenberghe W, Buée L, Defebvre L, Sablonnière B, Chartier-Harlin MC, Taymans JM, Huin V. Functional Analyses of Two Novel LRRK2 Pathogenic Variants in Familial Parkinson's Disease. Mov Disord 2022; 37:1761-1767. [PMID: 35708213 PMCID: PMC9543145 DOI: 10.1002/mds.29124] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 04/20/2022] [Accepted: 05/13/2022] [Indexed: 11/29/2022] Open
Abstract
Background Pathogenic variants in the LRRK2 gene are a common monogenic cause of Parkinson's disease. However, only seven variants have been confirmed to be pathogenic. Objectives We identified two novel LRRK2 variants (H230R and A1440P) and performed functional testing. Methods We transiently expressed wild‐type, the two new variants, or two known pathogenic mutants (G2019S and R1441G) in HEK‐293 T cells, with or without LRRK2 kinase inhibitor treatment. We characterized the phosphorylation and kinase activity of the mutants by western blotting. Thermal shift assays were performed to determine the folding and stability of the LRRK2 proteins. Results The two variants were found in two large families and segregate with the disease. They display altered LRRK2 phosphorylation and kinase activity. Conclusions We identified two novel LRRK2 variants which segregate with the disease. The results of functional testing lead us to propose these two variants as novel causative mutations for familial Parkinson's disease. © 2022 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society
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Affiliation(s)
- Ilda Coku
- University of Lille, Inserm, CHU Lille, U1172-LilNCog (JPARC)-Lille Neuroscience & Cognition, Lille, France
| | - Eugénie Mutez
- University of Lille, Inserm, CHU Lille, U1172-LilNCog (JPARC)-Lille Neuroscience & Cognition, Lille, France.,University of Lille, Inserm, CHU Lille, Expert Center for Parkinson's Disease, Lille, France
| | - Sabiha Eddarkaoui
- University of Lille, Inserm, CHU Lille, U1172-LilNCog (JPARC)-Lille Neuroscience & Cognition, Lille, France
| | - Sébastien Carrier
- University of Lille, Inserm, CHU Lille, U1172-LilNCog (JPARC)-Lille Neuroscience & Cognition, Lille, France
| | - Antoine Marchand
- University of Lille, Inserm, CHU Lille, U1172-LilNCog (JPARC)-Lille Neuroscience & Cognition, Lille, France
| | - Claire Deldycke
- University of Lille, Inserm, CHU Lille, U1172-LilNCog (JPARC)-Lille Neuroscience & Cognition, Lille, France
| | - Liesel Goveas
- University of Lille, Inserm, CHU Lille, U1172-LilNCog (JPARC)-Lille Neuroscience & Cognition, Lille, France
| | - Guillaume Baille
- University of Lille, Inserm, CHU Lille, Expert Center for Parkinson's Disease, Lille, France
| | - Mélissa Tir
- Department of Neurology and Expert Center for Parkinson's Disease, Amiens University Hospital, CHU Amiens-Picardie, Amiens, France
| | - Romain Magnez
- University of Lille, CNRS, Inserm, CHU Lille, UMR9020-U1277-CANTHER-Cancer Heterogeneity Plasticity and Resistance to Therapies, Lille, France
| | - Xavier Thuru
- University of Lille, CNRS, Inserm, CHU Lille, UMR9020-U1277-CANTHER-Cancer Heterogeneity Plasticity and Resistance to Therapies, Lille, France
| | | | - Wim Vandenberghe
- Department of Neurology, University Hospitals Leuven, Leuven, Belgium.,Laboratory for Parkinson Research, Department of Neurosciences, KU Leuven, Leuven, Belgium
| | - Luc Buée
- University of Lille, Inserm, CHU Lille, U1172-LilNCog (JPARC)-Lille Neuroscience & Cognition, Lille, France
| | - Luc Defebvre
- University of Lille, Inserm, CHU Lille, U1172-LilNCog (JPARC)-Lille Neuroscience & Cognition, Lille, France.,University of Lille, Inserm, CHU Lille, Expert Center for Parkinson's Disease, Lille, France
| | - Bernard Sablonnière
- University of Lille, Inserm, CHU Lille, U1172-LilNCog (JPARC)-Lille Neuroscience & Cognition, Lille, France.,University of Lille, Inserm, CHU Lille, Department of Toxicology and Genopathies, UF Neurobiology, Lille, France
| | | | - Jean-Marc Taymans
- University of Lille, Inserm, CHU Lille, U1172-LilNCog (JPARC)-Lille Neuroscience & Cognition, Lille, France
| | - Vincent Huin
- University of Lille, Inserm, CHU Lille, U1172-LilNCog (JPARC)-Lille Neuroscience & Cognition, Lille, France.,University of Lille, Inserm, CHU Lille, Department of Toxicology and Genopathies, UF Neurobiology, Lille, France
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6
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Petropoulou-Vathi L, Simitsi A, Valkimadi PE, Kedariti M, Dimitrakopoulos L, Koros C, Papadimitriou D, Papadimitriou A, Stefanis L, Alcalay RN, Rideout HJ. Distinct profiles of LRRK2 activation and Rab GTPase phosphorylation in clinical samples from different PD cohorts. NPJ Parkinsons Dis 2022; 8:73. [PMID: 35676398 PMCID: PMC9177829 DOI: 10.1038/s41531-022-00336-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 05/18/2022] [Indexed: 11/09/2022] Open
Abstract
Despite several advances in the field, pharmacodynamic outcome measures reflective of LRRK2 kinase activity in clinical biofluids remain urgently needed. A variety of targets and approaches have been utilized including assessments of LRRK2 itself (levels, phosphorylation), or its substrates (e.g. Rab10 or other Rab GTPases). We have previously shown that intrinsic kinase activity of LRRK2 isolated from PBMCs of G2019S carriers is elevated, irrespective of disease status. In the present study we find that phosphorylation of Rab10 is also elevated in G2019S carriers, but only those with PD. Additionally, phosphorylation of this substrate is also elevated in two separate idiopathic PD cohorts, but not in carriers of the A53T mutation in α-synuclein. In contrast, Rab29 phosphorylation was specifically reduced in urinary exosomes from A53T and idiopathic PD patients. Taken together, our findings highlight the need for the assessment of multiple complimentary targets for a more comprehensive picture of the disease.
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Affiliation(s)
- Lilian Petropoulou-Vathi
- Center for Clinical, Experimental Surgery, and Translational Research, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
| | - Athina Simitsi
- Department of Neurology, University of Athens Medical School, Athens, Greece
| | - Politymi-Eleni Valkimadi
- Center for Clinical, Experimental Surgery, and Translational Research, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
| | - Maria Kedariti
- Center for Clinical, Experimental Surgery, and Translational Research, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
| | - Lampros Dimitrakopoulos
- Center for Clinical, Experimental Surgery, and Translational Research, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
| | - Christos Koros
- Department of Neurology, University of Athens Medical School, Athens, Greece
| | | | | | - Leonidas Stefanis
- Center for Clinical, Experimental Surgery, and Translational Research, Biomedical Research Foundation of the Academy of Athens, Athens, Greece.,Department of Neurology, University of Athens Medical School, Athens, Greece
| | - Roy N Alcalay
- Department of Neurology, Columbia University, York City, NY, USA
| | - Hardy J Rideout
- Center for Clinical, Experimental Surgery, and Translational Research, Biomedical Research Foundation of the Academy of Athens, Athens, Greece.
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7
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Marchand A, Sarchione A, Athanasopoulos PS, Roy HBL, Goveas L, Magnez R, Drouyer M, Emanuele M, Ho FY, Liberelle M, Melnyk P, Lebègue N, Thuru X, Nichols RJ, Greggio E, Kortholt A, Galli T, Chartier-Harlin MC, Taymans JM. A Phosphosite Mutant Approach on LRRK2 Links Phosphorylation and Dephosphorylation to Protective and Deleterious Markers, Respectively. Cells 2022; 11:cells11061018. [PMID: 35326469 PMCID: PMC8946913 DOI: 10.3390/cells11061018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 02/25/2022] [Accepted: 03/08/2022] [Indexed: 12/23/2022] Open
Abstract
The Leucine Rich Repeat Kinase 2 (LRRK2) gene is a major genetic determinant of Parkinson’s disease (PD), encoding a homonymous multi-domain protein with two catalytic activities, GTPase and Kinase, involved in intracellular signaling and trafficking. LRRK2 is phosphorylated at multiple sites, including a cluster of autophosphorylation sites in the GTPase domain and a cluster of heterologous phosphorylation sites at residues 860 to 976. Phosphorylation at these latter sites is found to be modified in brains of PD patients, as well as for some disease mutant forms of LRRK2. The main aim of this study is to investigate the functional consequences of LRRK2 phosphorylation or dephosphorylation at LRRK2’s heterologous phosphorylation sites. To this end, we generated LRRK2 phosphorylation site mutants and studied how these affected LRRK2 catalytic activity, neurite outgrowth and lysosomal physiology in cellular models. We show that phosphorylation of RAB8a and RAB10 substrates are reduced with phosphomimicking forms of LRRK2, while RAB29 induced activation of LRRK2 kinase activity is enhanced for phosphodead forms of LRRK2. Considering the hypothesis that PD pathology is associated to increased LRRK2 kinase activity, our results suggest that for its heterologous phosphorylation sites LRRK2 phosphorylation correlates to healthy phenotypes and LRRK2 dephosphorylation correlates to phenotypes associated to the PD pathological processes.
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Affiliation(s)
- Antoine Marchand
- University of Lille, Inserm, CHU Lille, U1172-LilNCog-Lille Neuroscience and Cognition, F-59000 Lille, France; (A.M.); (A.S.); (L.G.); (M.D.); (M.E.); (M.L.); (P.M.); (N.L.)
| | - Alessia Sarchione
- University of Lille, Inserm, CHU Lille, U1172-LilNCog-Lille Neuroscience and Cognition, F-59000 Lille, France; (A.M.); (A.S.); (L.G.); (M.D.); (M.E.); (M.L.); (P.M.); (N.L.)
| | - Panagiotis S. Athanasopoulos
- Department of Cell Biochemistry, University of Groningen, 9747 AG Groningen, The Netherlands; (P.S.A.); (F.Y.H.); (A.K.)
| | | | - Liesel Goveas
- University of Lille, Inserm, CHU Lille, U1172-LilNCog-Lille Neuroscience and Cognition, F-59000 Lille, France; (A.M.); (A.S.); (L.G.); (M.D.); (M.E.); (M.L.); (P.M.); (N.L.)
| | - Romain Magnez
- University of Lille, CNRS, Inserm, CHU Lille, UMR9020-UMR1277—Canther—Cancer Heterogeneity Plasticity and Resistance to Therapies, Platform of Integrative Chemical Biology, F-59000 Lille, France; (R.M.); (X.T.)
| | - Matthieu Drouyer
- University of Lille, Inserm, CHU Lille, U1172-LilNCog-Lille Neuroscience and Cognition, F-59000 Lille, France; (A.M.); (A.S.); (L.G.); (M.D.); (M.E.); (M.L.); (P.M.); (N.L.)
| | - Marco Emanuele
- University of Lille, Inserm, CHU Lille, U1172-LilNCog-Lille Neuroscience and Cognition, F-59000 Lille, France; (A.M.); (A.S.); (L.G.); (M.D.); (M.E.); (M.L.); (P.M.); (N.L.)
| | - Franz Y. Ho
- Department of Cell Biochemistry, University of Groningen, 9747 AG Groningen, The Netherlands; (P.S.A.); (F.Y.H.); (A.K.)
| | - Maxime Liberelle
- University of Lille, Inserm, CHU Lille, U1172-LilNCog-Lille Neuroscience and Cognition, F-59000 Lille, France; (A.M.); (A.S.); (L.G.); (M.D.); (M.E.); (M.L.); (P.M.); (N.L.)
| | - Patricia Melnyk
- University of Lille, Inserm, CHU Lille, U1172-LilNCog-Lille Neuroscience and Cognition, F-59000 Lille, France; (A.M.); (A.S.); (L.G.); (M.D.); (M.E.); (M.L.); (P.M.); (N.L.)
| | - Nicolas Lebègue
- University of Lille, Inserm, CHU Lille, U1172-LilNCog-Lille Neuroscience and Cognition, F-59000 Lille, France; (A.M.); (A.S.); (L.G.); (M.D.); (M.E.); (M.L.); (P.M.); (N.L.)
| | - Xavier Thuru
- University of Lille, CNRS, Inserm, CHU Lille, UMR9020-UMR1277—Canther—Cancer Heterogeneity Plasticity and Resistance to Therapies, Platform of Integrative Chemical Biology, F-59000 Lille, France; (R.M.); (X.T.)
| | - R. Jeremy Nichols
- Department of Pathology, Stanford University, Stanford, CA 94305, USA;
| | - Elisa Greggio
- Physiology, Genetics and Behavior Unit, Department of Biology, University of Padova, 35131 Padova, Italy;
| | - Arjan Kortholt
- Department of Cell Biochemistry, University of Groningen, 9747 AG Groningen, The Netherlands; (P.S.A.); (F.Y.H.); (A.K.)
| | - Thierry Galli
- Institute of Psychiatry and Neuroscience of Paris, Université Paris Cité, INSERM U1266, F-75014 Paris, France;
- GHU-Paris Psychiatrie et Neurosciences, Hôpital Sainte Anne, F-75014 Paris, France
| | - Marie-Christine Chartier-Harlin
- University of Lille, Inserm, CHU Lille, U1172-LilNCog-Lille Neuroscience and Cognition, F-59000 Lille, France; (A.M.); (A.S.); (L.G.); (M.D.); (M.E.); (M.L.); (P.M.); (N.L.)
- Correspondence: (M.-C.C.-H.); (J.-M.T.)
| | - Jean-Marc Taymans
- University of Lille, Inserm, CHU Lille, U1172-LilNCog-Lille Neuroscience and Cognition, F-59000 Lille, France; (A.M.); (A.S.); (L.G.); (M.D.); (M.E.); (M.L.); (P.M.); (N.L.)
- Correspondence: (M.-C.C.-H.); (J.-M.T.)
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8
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LRRK2 at Striatal Synapses: Cell-Type Specificity and Mechanistic Insights. Cells 2022; 11:cells11010169. [PMID: 35011731 PMCID: PMC8750662 DOI: 10.3390/cells11010169] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 12/10/2021] [Accepted: 12/21/2021] [Indexed: 12/13/2022] Open
Abstract
Mutations in leucine-rich repeat kinase 2 (LRRK2) cause Parkinson’s disease with a similar clinical presentation and progression to idiopathic Parkinson’s disease, and common variation is linked to disease risk. Recapitulation of the genotype in rodent models causes abnormal dopamine release and increases the susceptibility of dopaminergic neurons to insults, making LRRK2 a valuable model for understanding the pathobiology of Parkinson’s disease. It is also a promising druggable target with targeted therapies currently in development. LRRK2 mRNA and protein expression in the brain is highly variable across regions and cellular identities. A growing body of work has demonstrated that pathogenic LRRK2 mutations disrupt striatal synapses before the onset of overt neurodegeneration. Several substrates and interactors of LRRK2 have been identified to potentially mediate these pre-neurodegenerative changes in a cell-type-specific manner. This review discusses the effects of pathogenic LRRK2 mutations in striatal neurons, including cell-type-specific and pathway-specific alterations. It also highlights several LRRK2 effectors that could mediate the alterations to striatal function, including Rabs and protein kinase A. The lessons learned from improving our understanding of the pathogenic effects of LRRK2 mutations in striatal neurons will be applicable to both dissecting the cell-type specificity of LRRK2 function in the transcriptionally diverse subtypes of dopaminergic neurons and also increasing our understanding of basal ganglia development and biology. Finally, it will inform the development of therapeutics for Parkinson’s disease.
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9
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The Roc domain of LRRK2 as a hub for protein-protein interactions: a focus on PAK6 and its impact on RAB phosphorylation. Brain Res 2022; 1778:147781. [DOI: 10.1016/j.brainres.2022.147781] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 12/21/2021] [Accepted: 01/04/2022] [Indexed: 12/17/2022]
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10
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Tasegian A, Singh F, Ganley IG, Reith AD, Alessi DR. Impact of Type II LRRK2 inhibitors on signaling and mitophagy. Biochem J 2021; 478:3555-3573. [PMID: 34515301 PMCID: PMC8589421 DOI: 10.1042/bcj20210375] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 09/09/2021] [Accepted: 09/10/2021] [Indexed: 01/21/2023]
Abstract
Much effort has been devoted to the development of selective inhibitors of the LRRK2 as a potential treatment for LRRK2 driven Parkinson's disease. In this study, we first compare the properties of Type I (GSK3357679A and MLi-2) and Type II (GZD-824, Rebastinib and Ponatinib) kinase inhibitors that bind to the closed or open conformations of the LRRK2 kinase domain, respectively. We show that Type I and Type II inhibitors suppress phosphorylation of Rab10 and Rab12, key physiological substrates of LRRK2 and also promote mitophagy, a process suppressed by LRRK2. Type II inhibitors also display higher potency towards wild-type LRRK2 compared with pathogenic mutants. Unexpectedly, we find that Type II inhibitors, in contrast with Type I compounds, fail to induce dephosphorylation of a set of well-studied LRRK2 biomarker phosphorylation sites at the N-terminal region of LRRK2, including Ser935. These findings emphasize that the biomarker phosphorylation sites on LRRK2 are likely reporting on the open vs closed conformation of LRRK2 kinase and that only inhibitors which stabilize the closed conformation induce dephosphorylation of these biomarker sites. Finally, we demonstrate that the LRRK2[A2016T] mutant which is resistant to MLi-2 Type 1 inhibitor, also induces resistance to GZD-824 and Rebastinib suggesting this mutation could be exploited to distinguish off target effects of Type II inhibitors. Our observations provide a framework of knowledge to aid with the development of more selective Type II LRRK2 inhibitors.
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Affiliation(s)
- Anna Tasegian
- Medical Research Council (MRC) Protein Phosphorylation and Ubiquitylation Unit, School of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, U.K
| | - Francois Singh
- Medical Research Council (MRC) Protein Phosphorylation and Ubiquitylation Unit, School of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, U.K
| | - Ian G. Ganley
- Medical Research Council (MRC) Protein Phosphorylation and Ubiquitylation Unit, School of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, U.K
| | - Alastair D. Reith
- GlaxoSmithKline Pharmaceuticals R&D, Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Dario R. Alessi
- Medical Research Council (MRC) Protein Phosphorylation and Ubiquitylation Unit, School of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, U.K
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11
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Pathways to Parkinson's disease: a spotlight on 14-3-3 proteins. NPJ Parkinsons Dis 2021; 7:85. [PMID: 34548498 PMCID: PMC8455551 DOI: 10.1038/s41531-021-00230-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 07/23/2021] [Indexed: 02/08/2023] Open
Abstract
14-3-3s represent a family of highly conserved 30 kDa acidic proteins. 14-3-3s recognize and bind specific phospho-sequences on client partners and operate as molecular hubs to regulate their activity, localization, folding, degradation, and protein-protein interactions. 14-3-3s are also associated with the pathogenesis of several diseases, among which Parkinson's disease (PD). 14-3-3s are found within Lewy bodies (LBs) in PD patients, and their neuroprotective effects have been demonstrated in several animal models of PD. Notably, 14-3-3s interact with some of the major proteins known to be involved in the pathogenesis of PD. Here we first provide a detailed overview of the molecular composition and structural features of 14-3-3s, laying significant emphasis on their peculiar target-binding mechanisms. We then briefly describe the implication of 14-3-3s in the central nervous system and focus on their interaction with LRRK2, α-Synuclein, and Parkin, three of the major players in PD onset and progression. We finally discuss how different types of small molecules may interfere with 14-3-3s interactome, thus representing a valid strategy in the future of drug discovery.
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12
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Allosteric inhibition of LRRK2, where are we now. Biochem Soc Trans 2021; 48:2185-2194. [PMID: 33079169 PMCID: PMC7609032 DOI: 10.1042/bst20200424] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 09/23/2020] [Accepted: 09/28/2020] [Indexed: 12/17/2022]
Abstract
Parkinson's disease (PD) is the second most common neurodegenerative disease. In recent years, it has been shown that leucine-rich repeat kinase 2 (LRRK2) has a crucial function in both familial and sporadic forms of PD. LRRK2 pathogenic mutations are thought to result in an increase in LRRK2 kinase activity. Thus, inhibiting LRRK2 kinase activity has become a main therapeutic target. Many compounds capable of inhibiting LRRK2 kinase activity with high selectivity and brain availability have been described. However, the safety of long-term use of these ATP-competitive LRRK2 kinase inhibitors has been challenged by several studies. Therefore, alternative ways of targeting LRRK2 activity will have a great benefit. In this review, we discuss the recent progress in the development of allosteric inhibitors of LRRK2, mainly via interfering with GTPase activity, and propose potential new intra and interprotein interactions targets that can lead to open doors toward new therapeutics.
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13
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Nazish I, Arber C, Piers TM, Warner TT, Hardy JA, Lewis PA, Pocock JM, Bandopadhyay R. Abrogation of LRRK2 dependent Rab10 phosphorylation with TLR4 activation and alterations in evoked cytokine release in immune cells. Neurochem Int 2021; 147:105070. [PMID: 34004238 PMCID: PMC7610942 DOI: 10.1016/j.neuint.2021.105070] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 05/11/2021] [Indexed: 02/08/2023]
Abstract
LRRK2 protein is expressed prominently in immune cells, cell types whose contribution to LRRK2-associated genetic Parkinson's disease (PD) is increasingly being recognised. We investigated the effect of inflammatory stimuli using RAW264.7 murine macrophage cells as model systems. A detailed time course of TLR2 and TLR4 stimulation was investigated through measuring LRRK2 phosphorylation at its specific phospho-sites, and Rab8 and Rab10 phosphorylation together with cytokine release following treatment with LPS and zymosan. LRRK2 phosphorylation at Ser935, Ser955 and Ser973 was increased significantly over untreated conditions at 4-24h in both WT-LRRK2 and T1348N-LRRK2 cell lines to similar extents although levels of Ser910 phosphorylation were maintained at higher levels throughout. Importantly we demonstrate that LPS stimulation significantly decreased phospho-Rab10 but not phospho-Rab8 levels over 4-24h in both WT-LRRK2 and T1348N-LRRK2 cell lines. The dephosphorylation of Rab10 was not attributed to its specific phosphatase, PPM1H as the levels remained unaltered with LPS treatment. MAPK phosphorylation occurred prior to LRRK2 phosphorylation which was validated by blocking TLR4 and TLR2 receptors with TAK242 or Sparstolonin B respectively. A significant decrease in basal level of TNFα release was noted in both T1348N-LRRK2 and KO-LRRK2 cell lines at 48h compared to WT-LRRK2 cell line, however LPS and zymosan treatment did not cause any significant alteration in the TNFα and IL-6 release between the three cell lines. In contrast, LPS and zymosan caused significantly lower IL-10 release in T1348N-LRRK2 and KO-LRRK2 cell lines. A significant decrease in phospho-Rab10 levels was also confirmed in human IPS-derived macrophages with TLR4 activation. Our data demonstrates for the first time that LRRK2-dependent Rab10 phosphorylation is modulated by LPS stimulation, and that cytokine release may be influenced by the status of LRRK2. These data provide further insights into the function of LRRK2 in immune response, and has relevance for understanding cellular dysfunctions when developing LRRK2-based inhibitors for clinical treatment.
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Affiliation(s)
- Iqra Nazish
- Reta Lila Weston Institute and Department of Clinical and Movement Neuroscience, UCL Queen Square Institute of Neurology, 1 Wakefield Street, WC1N 1PJ, UK
| | - Charles Arber
- Department of Neurodegenerative Diseases, UCL Queen Square Institute of Neurology, 1 Wakefield Street, WC1N 1PJ, UK
| | - Thomas M. Piers
- Department of Neuroinflammation, UCL Queen Square Institute of Neurology, 1 Wakefield Street, WC1N 1PJ, UK
| | - Thomas T. Warner
- Reta Lila Weston Institute and Department of Clinical and Movement Neuroscience, UCL Queen Square Institute of Neurology, 1 Wakefield Street, WC1N 1PJ, UK
| | - John A. Hardy
- Reta Lila Weston Institute and Department of Clinical and Movement Neuroscience, UCL Queen Square Institute of Neurology, 1 Wakefield Street, WC1N 1PJ, UK,Department of Neurodegenerative Diseases, UCL Queen Square Institute of Neurology, 1 Wakefield Street, WC1N 1PJ, UK,Queen Square Genomics, UCL Dementia Research Institute, Wing 1.2 Cruciform Building, Gower Street, London, WC1E 6BT, UK
| | - Patrick A. Lewis
- Department of Neurodegenerative Diseases, UCL Queen Square Institute of Neurology, 1 Wakefield Street, WC1N 1PJ, UK,Royal Veterinary College, Royal College Street, London, NW1 0TU, UK
| | - Jennifer M. Pocock
- Department of Neuroinflammation, UCL Queen Square Institute of Neurology, 1 Wakefield Street, WC1N 1PJ, UK
| | - Rina Bandopadhyay
- Reta Lila Weston Institute and Department of Clinical and Movement Neuroscience, UCL Queen Square Institute of Neurology, 1 Wakefield Street, WC1N 1PJ, UK.
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14
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Wang X, Negrou E, Maloney MT, Bondar VV, Andrews SV, Montalban M, Llapashtica C, Maciuca R, Nguyen H, Solanoy H, Arguello A, Przybyla L, Moerke NJ, Huntwork-Rodriguez S, Henry AG. Understanding LRRK2 kinase activity in preclinical models and human subjects through quantitative analysis of LRRK2 and pT73 Rab10. Sci Rep 2021; 11:12900. [PMID: 34145320 PMCID: PMC8213766 DOI: 10.1038/s41598-021-91943-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 06/01/2021] [Indexed: 02/08/2023] Open
Abstract
Variants in the leucine-rich repeat kinase 2 (LRRK2) gene are associated with increased risk for familial and sporadic Parkinson's disease (PD). Pathogenic variants in LRRK2, including the common variant G2019S, result in increased LRRK2 kinase activity, supporting the therapeutic potential of LRRK2 kinase inhibitors for PD. To better understand the role of LRRK2 in disease and to support the clinical development of LRRK2 inhibitors, quantitative and high-throughput assays to measure LRRK2 levels and activity are needed. We developed and applied such assays to measure the levels of LRRK2 as well as the phosphorylation of LRRK2 itself or one of its substrates, Rab10 (pT73 Rab10). We observed increased LRRK2 activity in various cellular models of disease, including iPSC-derived microglia, as well as in human subjects carrying the disease-linked variant LRRK2 G2019S. Capitalizing on the high-throughput and sensitive nature of these assays, we detected a significant reduction in LRRK2 activity in subjects carrying missense variants in LRRK2 associated with reduced disease risk. Finally, we optimized these assays to enable analysis of LRRK2 activity following inhibition in human peripheral blood mononuclear cells (PBMCs) and whole blood, demonstrating their potential utility as biomarkers to assess changes in LRRK2 expression and activity in the clinic.
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Affiliation(s)
- Xiang Wang
- Denali Therapeutics, Inc., 161 Oyster Point Blvd., South San Francisco, CA, 94080, USA
| | - Elvira Negrou
- Denali Therapeutics, Inc., 161 Oyster Point Blvd., South San Francisco, CA, 94080, USA
| | - Michael T Maloney
- Denali Therapeutics, Inc., 161 Oyster Point Blvd., South San Francisco, CA, 94080, USA
| | - Vitaliy V Bondar
- Denali Therapeutics, Inc., 161 Oyster Point Blvd., South San Francisco, CA, 94080, USA
| | - Shan V Andrews
- Denali Therapeutics, Inc., 161 Oyster Point Blvd., South San Francisco, CA, 94080, USA
| | - Manuel Montalban
- Denali Therapeutics, Inc., 161 Oyster Point Blvd., South San Francisco, CA, 94080, USA
| | - Ceyda Llapashtica
- Denali Therapeutics, Inc., 161 Oyster Point Blvd., South San Francisco, CA, 94080, USA
| | - Romeo Maciuca
- Denali Therapeutics, Inc., 161 Oyster Point Blvd., South San Francisco, CA, 94080, USA
| | - Hoang Nguyen
- Denali Therapeutics, Inc., 161 Oyster Point Blvd., South San Francisco, CA, 94080, USA
| | - Hilda Solanoy
- Denali Therapeutics, Inc., 161 Oyster Point Blvd., South San Francisco, CA, 94080, USA
| | - Annie Arguello
- Denali Therapeutics, Inc., 161 Oyster Point Blvd., South San Francisco, CA, 94080, USA
| | - Laralynne Przybyla
- Denali Therapeutics, Inc., 161 Oyster Point Blvd., South San Francisco, CA, 94080, USA
| | - Nathan J Moerke
- Denali Therapeutics, Inc., 161 Oyster Point Blvd., South San Francisco, CA, 94080, USA
| | | | - Anastasia G Henry
- Denali Therapeutics, Inc., 161 Oyster Point Blvd., South San Francisco, CA, 94080, USA.
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15
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Harney J, Bajaj P, Finley JE, Kopec AK, Koza-Taylor PH, Boucher GG, Lanz TA, Doshna CM, Somps CJ, Adkins K, Houle C. An in vitro alveolar epithelial cell model recapitulates LRRK2 inhibitor-induced increases in lamellar body size observed in preclinical models. Toxicol In Vitro 2021; 70:105012. [DOI: 10.1016/j.tiv.2020.105012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 09/14/2020] [Accepted: 10/05/2020] [Indexed: 01/28/2023]
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16
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Gonzalez-Hunt CP, Thacker EA, Toste CM, Boularand S, Deprets S, Dubois L, Sanders LH. Mitochondrial DNA damage as a potential biomarker of LRRK2 kinase activity in LRRK2 Parkinson's disease. Sci Rep 2020; 10:17293. [PMID: 33057100 PMCID: PMC7557909 DOI: 10.1038/s41598-020-74195-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 09/14/2020] [Indexed: 12/14/2022] Open
Abstract
Leucine-rich repeat kinase 2 (LRRK2) is a promising therapeutic target for the treatment of Parkinson's disease (PD) and LRRK2 kinase inhibitors are currently being tested in early phase clinical trials. In order to ensure the highest chance of success, a biomarker-guided entry into clinical trials is key. LRRK2 phosphorylation, and phosphorylation of the LRRK2 substrate Rab10, have been proposed as target engagement biomarkers for LRRK2 kinase inhibition. However, a pharmacodynamic biomarker to demonstrate that a biological response has occurred is lacking. We previously discovered that the LRRK2 G2019S mutation causes mitochondrial DNA (mtDNA) damage and is LRRK2 kinase activity-dependent. Here, we have explored the possibility that measurement of mtDNA damage is a "surrogate" for LRRK2 kinase activity and consequently of kinase inhibitor activity. Mitochondrial DNA damage was robustly increased in PD patient-derived immune cells with LRRK2 G2019S mutations as compared with controls. Following treatment with multiple classes of LRRK2 kinase inhibitors, a full reversal of mtDNA damage to healthy control levels was observed and correlated with measures of LRRK2 dephosphorylation. Taken together, assessment of mtDNA damage levels may be a sensitive measure of altered kinase activity and provide an extended profile of LRRK2 kinase modulation in clinical studies.
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Affiliation(s)
- C P Gonzalez-Hunt
- Department of Neurology, Duke University Medical Center, Durham, NC, 27710, USA
| | - E A Thacker
- Department of Neurology, Duke University Medical Center, Durham, NC, 27710, USA
| | - C M Toste
- Department of Neurology, Duke University Medical Center, Durham, NC, 27710, USA
| | - S Boularand
- Rare & Neurologic Diseases Research, Sanofi, Chilly Mazarin, France
| | - S Deprets
- Rare & Neurologic Diseases Research, Sanofi, Chilly Mazarin, France
| | - L Dubois
- Rare & Neurologic Diseases Research, Sanofi, Chilly Mazarin, France
| | - L H Sanders
- Department of Neurology, Duke University Medical Center, Durham, NC, 27710, USA.
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17
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Karayel Ö, Tonelli F, Virreira Winter S, Geyer PE, Fan Y, Sammler EM, Alessi DR, Steger M, Mann M. Accurate MS-based Rab10 Phosphorylation Stoichiometry Determination as Readout for LRRK2 Activity in Parkinson's Disease. Mol Cell Proteomics 2020; 19:1546-1560. [PMID: 32601174 PMCID: PMC8143643 DOI: 10.1074/mcp.ra120.002055] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 06/17/2020] [Indexed: 12/11/2022] Open
Abstract
Pathogenic mutations in the Leucine-rich repeat kinase 2 (LRRK2) are the predominant genetic cause of Parkinson's disease (PD). They increase its activity, resulting in augmented Rab10-Thr73 phosphorylation and conversely, LRRK2 inhibition decreases pRab10 levels. Currently, there is no assay to quantify pRab10 levels for drug target engagement or patient stratification. To meet this challenge, we developed an high accuracy and sensitivity targeted mass spectrometry (MS)-based assay for determining Rab10-Thr73 phosphorylation stoichiometry in human samples. It uses synthetic stable isotope-labeled (SIL) analogues for both phosphorylated and nonphosphorylated tryptic peptides surrounding Rab10-Thr73 to directly derive the percentage of Rab10 phosphorylation from attomole amounts of the endogenous phosphopeptide. The SIL and the endogenous phosphopeptides are separately admitted into an Orbitrap analyzer with the appropriate injection times. We test the reproducibility of our assay by determining Rab10-Thr73 phosphorylation stoichiometry in neutrophils of LRRK2 mutation carriers before and after LRRK2 inhibition. Compared with healthy controls, the PD predisposing mutation carriers LRRK2 G2019S and VPS35 D620N display 1.9-fold and 3.7-fold increased pRab10 levels, respectively. Our generic MS-based assay further establishes the relevance of pRab10 as a prognostic PD marker and is a powerful tool for determining LRRK2 inhibitor efficacy and for stratifying PD patients for LRRK2 inhibitor treatment.
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Affiliation(s)
- Özge Karayel
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Francesca Tonelli
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, University of Dundee, Dundee, United Kingdom
| | - Sebastian Virreira Winter
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Phillip E Geyer
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Ying Fan
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, University of Dundee, Dundee, United Kingdom
| | - Esther M Sammler
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, University of Dundee, Dundee, United Kingdom; Department of Neurology, School of Medicine, Ninewells Hospital, Ninewells Drive, Dundee, United Kingdom
| | - Dario R Alessi
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, University of Dundee, Dundee, United Kingdom
| | - Martin Steger
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany.
| | - Matthias Mann
- Department of Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany.
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18
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Marchand A, Drouyer M, Sarchione A, Chartier-Harlin MC, Taymans JM. LRRK2 Phosphorylation, More Than an Epiphenomenon. Front Neurosci 2020; 14:527. [PMID: 32612495 PMCID: PMC7308437 DOI: 10.3389/fnins.2020.00527] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Accepted: 04/28/2020] [Indexed: 12/12/2022] Open
Abstract
Mutations in the Leucine Rich Repeat Kinase 2 (LRRK2) gene are linked to autosomal dominant Parkinson's disease (PD), and genetic variations at the LRRK2 locus are associated with an increased risk for sporadic PD. This gene encodes a kinase that is physiologically multiphosphorylated, including clusters of both heterologous phosphorylation and autophosphorylation sites. Several pieces of evidence indicate that LRRK2's phosphorylation is important for its pathological and physiological functioning. These include a reduced LRRK2 heterologous phosphorylation in PD brains or after pharmacological inhibition of LRRK2 kinase activity as well as the appearance of subcellular LRRK2 accumulations when this protein is dephosphorylated at heterologous phosphosites. Nevertheless, the regulatory mechanisms governing LRRK2 phosphorylation levels and the cellular consequences of changes in LRRK2 phosphorylation remain incompletely understood. In this review, we present current knowledge on LRRK2 phosphorylation, LRRK2 phosphoregulation, and how LRRK2 phosphorylation changes affect cellular processes that may ultimately be linked to PD mechanisms.
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Affiliation(s)
- Antoine Marchand
- University of Lille, Inserm, CHU Lille, U1172 - LilNCog - Lille Neuroscience & Cognition, Lille, France
- Inserm, UMR-S 1172, Team “Brain Biology and Chemistry”, Lille, France
| | - Matthieu Drouyer
- University of Lille, Inserm, CHU Lille, U1172 - LilNCog - Lille Neuroscience & Cognition, Lille, France
- Inserm, UMR-S 1172, Team “Brain Biology and Chemistry”, Lille, France
| | - Alessia Sarchione
- University of Lille, Inserm, CHU Lille, U1172 - LilNCog - Lille Neuroscience & Cognition, Lille, France
- Inserm, UMR-S 1172, Team “Brain Biology and Chemistry”, Lille, France
| | - Marie-Christine Chartier-Harlin
- University of Lille, Inserm, CHU Lille, U1172 - LilNCog - Lille Neuroscience & Cognition, Lille, France
- Inserm, UMR-S 1172, Team “Brain Biology and Chemistry”, Lille, France
| | - Jean-Marc Taymans
- University of Lille, Inserm, CHU Lille, U1172 - LilNCog - Lille Neuroscience & Cognition, Lille, France
- Inserm, UMR-S 1172, Team “Brain Biology and Chemistry”, Lille, France
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Gloeckner CJ, Porras P. Guilt-by-Association - Functional Insights Gained From Studying the LRRK2 Interactome. Front Neurosci 2020; 14:485. [PMID: 32508578 PMCID: PMC7251075 DOI: 10.3389/fnins.2020.00485] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 04/20/2020] [Indexed: 12/11/2022] Open
Abstract
The Parkinson's disease-associated Leucine-rich repeat kinase 2 (LRRK2) is a complex multi-domain protein belonging to the Roco protein family, a unique group of G-proteins. Variants of this gene are associated with an increased risk of Parkinson's disease. Besides its well-characterized enzymatic activities, conferred by its GTPase and kinase domains, and a central dimerization domain, it contains four predicted repeat domains, which are, based on their structure, commonly involved in protein-protein interactions (PPIs). In the past decades, tremendous progress has been made in determining comprehensive interactome maps for the human proteome. Knowledge of PPIs has been instrumental in assigning functions to proteins involved in human disease and helped to understand the connectivity between different disease pathways and also significantly contributed to the functional understanding of LRRK2. In addition to an increased kinase activity observed for proteins containing PD-associated variants, various studies helped to establish LRRK2 as a large scaffold protein in the interface between cytoskeletal dynamics and the vesicular transport. This review first discusses a number of specific LRRK2-associated PPIs for which a functional consequence can at least be speculated upon, and then considers the representation of LRRK2 protein interactions in public repositories, providing an outlook on open research questions and challenges in this field.
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Affiliation(s)
- Christian Johannes Gloeckner
- German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
- Center for Ophthalmology, Institute for Ophthalmic Research, Core Facility for Medical Bioanalytics, University of Tübingen, Tübingen, Germany
- Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Pablo Porras
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Cherry Hinton, United Kingdom
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20
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Padmanabhan S, Lanz TA, Gorman D, Wolfe M, Joyce A, Cabrera C, Lawrence-Henderson R, Levers N, Joshi N, Ma TC, Liong C, Narayan S, Alcalay RN, Hutten SJ, Baptista MA, Merchant K. An Assessment of LRRK2 Serine 935 Phosphorylation in Human Peripheral Blood Mononuclear Cells in Idiopathic Parkinson's Disease and G2019S LRRK2 Cohorts. JOURNAL OF PARKINSON'S DISEASE 2020; 10:623-629. [PMID: 32007961 PMCID: PMC7242833 DOI: 10.3233/jpd-191786] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Accepted: 01/04/2020] [Indexed: 12/28/2022]
Abstract
The phosphorylated form of LRRK2, pS935 LRRK2, has been proposed as a target modulation biomarker for LRRK2 inhibitors. The primary aim of the study was to characterize and qualify this biomarker for therapeutic trials of LRRK2 inhibitors in Parkinson's disease (PD). To this end, analytically validated assays were used to monitor levels of pS935 LRRK2 and total LRRK2 in peripheral blood mononuclear cells (PBMCs) from the following donor groups: healthy controls, idiopathic PD, and G2019S carriers with and without PD. Neither analyte correlated with age, gender, or disease severity. While total LRRK2 levels were similar across the four groups, there was a significant reduction in pS935 LRRK2 levels in disease-manifesting G2019S carriers compared to idiopathic PD. In aggregate, these data indicate that phosphorylation of LRRK2 at S935 may reflect a state marker for G2019S LRRK2-driven PD, the underlying biology for which requires investigation in future studies. This study also provides critical foundational data to inform the integration of pS935 and total LRRK2 levels as biomarkers in therapeutic trials of LRRK2 kinase inhibitors.
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Affiliation(s)
| | | | | | | | | | | | | | - Najah Levers
- Department of Neurology, Columbia University, NY, USA
| | - Neal Joshi
- Department of Neurology, Columbia University, NY, USA
| | - Thong C. Ma
- Department of Neurology, Columbia University, NY, USA
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21
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Identification of PP2A and S6 Kinase as Modifiers of Leucine-Rich Repeat Kinase-Induced Neurotoxicity. Neuromolecular Med 2019; 22:218-226. [PMID: 31664682 PMCID: PMC7230064 DOI: 10.1007/s12017-019-08577-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 10/13/2019] [Indexed: 12/03/2022]
Abstract
Mutations in LRRK2 are currently recognized as the most common monogenetic cause of Parkinsonism. The elevation of kinase activity of LRRK2 that frequently accompanies its mutations is widely thought to contribute to its toxicity. Accordingly, many groups have developed LRRK2-specific kinase inhibitors as a potential therapeutic strategy. Given that protein phosphorylation is a reversible event, we sought to elucidate the phosphatase(s) that can reverse LRRK2-mediated phosphorylation, with the view that targeting this phosphatase(s) may similarly be beneficial. Using an unbiased RNAi phosphatase screen conducted in a Drosophila LRRK2 model, we identified PP2A as a genetic modulator of LRRK2-induced neurotoxicity. Further, we also identified ribosomal S6 kinase (S6K), a target of PP2A, as a novel regulator of LRRK2 function. Finally, we showed that modulation of PP2A or S6K activities ameliorates LRRK2-associated disease phenotype in Drosophila.
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De Wit T, Baekelandt V, Lobbestael E. Inhibition of LRRK2 or Casein Kinase 1 Results in LRRK2 Protein Destabilization. Mol Neurobiol 2018; 56:5273-5286. [PMID: 30592011 PMCID: PMC6657425 DOI: 10.1007/s12035-018-1449-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 12/06/2018] [Indexed: 11/25/2022]
Abstract
Mutations and variations in the leucine-rich repeat kinase 2 (LRRK2) gene are strongly associated with an increased risk to develop Parkinson's disease (PD). Most pathogenic LRRK2 mutations display increased kinase activity, which is believed to underlie LRRK2-mediated toxicity. Therefore, major efforts have been invested in the development of potent and selective LRRK2 kinase inhibitors. Several of these compounds have proven beneficial in cells and in vivo, even in a LRRK2 wild-type background. Therefore, LRRK2 kinase inhibition holds great promise as disease-modifying PD therapy, and is currently tested in preclinical and early clinical studies. One of the safety concerns is the development of lung pathology in mice and non-human primates, which is most likely related to the strongly reduced LRRK2 protein levels after LRRK2 kinase inhibition. In this study, we aimed to better understand the molecular consequences of chronic LRRK2 kinase inhibition, which may be pivotal in the further development of a LRRK2 kinase inhibitor-based PD therapy. We found that LRRK2 protein levels are not restored during long-term LRRK2 kinase inhibition, but are recovered upon inhibitor withdrawal. Interestingly, LRRK2 kinase inhibitor-induced destabilization does not occur in all pathogenic LRRK2 variants and the N-terminal part of LRRK2 appears to play a crucial role in this process. In addition, we identified CK1, an upstream kinase of LRRK2, as a regulator of LRRK2 protein stability in cell culture and in vivo. We propose that pharmacological LRRK2 kinase inhibition triggers a cascade that results in reduced CK1-mediated phosphorylation of yet unidentified LRRK2 phosphorylation sites. This process involves the N-terminus of LRRK2 and ultimately leads to LRRK2 protein degradation.
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Affiliation(s)
- T De Wit
- Laboratory for Neurobiology and Gene Therapy, Department of Neurosciences, KU Leuven, Herestraat 49 - Bus 1023, 3000, Leuven, Belgium
| | - V Baekelandt
- Laboratory for Neurobiology and Gene Therapy, Department of Neurosciences, KU Leuven, Herestraat 49 - Bus 1023, 3000, Leuven, Belgium.
| | - E Lobbestael
- Laboratory for Neurobiology and Gene Therapy, Department of Neurosciences, KU Leuven, Herestraat 49 - Bus 1023, 3000, Leuven, Belgium.
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Functional and behavioral consequences of Parkinson's disease-associated LRRK2-G2019S mutation. Biochem Soc Trans 2018; 46:1697-1705. [PMID: 30514770 DOI: 10.1042/bst20180468] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Revised: 10/09/2018] [Accepted: 10/11/2018] [Indexed: 12/18/2022]
Abstract
LRRK2 mutation is the most common inherited, autosomal dominant cause of Parkinson's disease (PD) and has also been observed in sporadic cases. Most mutations result in increased LRRK2 kinase activity. LRRK2 is highly expressed in brain regions that receive dense, convergent innervation by dopaminergic and glutamatergic axons, and its levels rise developmentally coincident with glutamatergic synapse formation. The onset and timing of expression suggests strongly that LRRK2 regulates the development, maturation and function of synapses. Several lines of data in mice show that LRRK2-G2019S, the most common LRRK2 mutation, produces an abnormal gain of pathological function that affects synaptic activity, spine morphology, persistent forms of synapse plasticity and behavioral responses to social stress. Effects of the mutation can be detected as early as the second week of postnatal development and can last or have consequences that extend into adulthood and occur in the absence of dopamine loss. These data suggest that the generation of neural circuits that support complex behaviors is modified by LRRK2-G2019S. Whether such alterations impart vulnerability to neurons directly or indirectly, they bring to the forefront the idea that neural circuits within which dopamine neurons eventually degenerate are assembled and utilized in ways that are distinct from circuits that lack this mutation and may contribute to non-motor symptoms observed in humans with PD.
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Parkinson's disease-like burst firing activity in subthalamic nucleus induced by AAV-α-synuclein is normalized by LRRK2 modulation. Neurobiol Dis 2018; 116:13-27. [DOI: 10.1016/j.nbd.2018.04.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 04/10/2018] [Accepted: 04/16/2018] [Indexed: 01/13/2023] Open
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Genetic Modifiers of Neurodegeneration in a Drosophila Model of Parkinson's Disease. Genetics 2018; 209:1345-1356. [PMID: 29907646 DOI: 10.1534/genetics.118.301119] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 06/03/2018] [Indexed: 11/18/2022] Open
Abstract
Disease phenotypes can be highly variable among individuals with the same pathogenic mutation. There is increasing evidence that background genetic variation is a strong driver of disease variability in addition to the influence of environment. To understand the genotype-phenotype relationship that determines the expressivity of a pathogenic mutation, a large number of backgrounds must be studied. This can be efficiently achieved using model organism collections such as the Drosophila Genetic Reference Panel (DGRP). Here, we used the DGRP to assess the variability of locomotor dysfunction in a LRRK2 G2019S Drosophila melanogaster model of Parkinson's disease (PD). We find substantial variability in the LRRK2 G2019S locomotor phenotype in different DGRP backgrounds. A genome-wide association study for candidate genetic modifiers reveals 177 genes that drive wide phenotypic variation, including 19 top association genes. Genes involved in the outgrowth and regulation of neuronal projections are enriched in these candidate modifiers. RNAi functional testing of the top association and neuronal projection-related genes reveals that pros, pbl, ct, and CG33506 significantly modify age-related dopamine neuron loss and associated locomotor dysfunction in the Drosophila LRRK2 G2019S model. These results demonstrate how natural genetic variation can be used as a powerful tool to identify genes that modify disease-related phenotypes. We report novel candidate modifier genes for LRRK2 G2019S that may be used to interrogate the link between LRRK2, neurite regulation and neuronal degeneration in PD.
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Chen ML, Wu RM. LRRK 2 gene mutations in the pathophysiology of the ROCO domain and therapeutic targets for Parkinson's disease: a review. J Biomed Sci 2018; 25:52. [PMID: 29903014 PMCID: PMC6000924 DOI: 10.1186/s12929-018-0454-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 05/31/2018] [Indexed: 01/13/2023] Open
Abstract
Parkinson’s disease (PD) is the most common movement disorder and manifests as resting tremor, rigidity, bradykinesia, and postural instability. Pathologically, PD is characterized by selective loss of dopaminergic neurons in the substantia nigra and the formation of intracellular inclusions containing α-synuclein and ubiquitin called Lewy bodies. Consequently, a remarkable deficiency of dopamine in the striatum causes progressive disability of motor function. The etiology of PD remains uncertain. Genetic variability in leucine-rich repeat kinase 2 (LRRK2) is the most common genetic cause of sporadic and familial PD. LRRK2 encodes a large protein containing three catalytic and four protein-protein interaction domains. Patients with LRRK2 mutations exhibit a clinical and pathological phenotype indistinguishable from sporadic PD. Recent studies have shown that pathological mutations of LRRK2 can reduce the rate of guanosine triphosphate (GTP) hydrolysis, increase kinase activity and GTP binding activity, and subsequently cause cell death. The process of cell death involves several signaling pathways, including the autophagic–lysosomal pathway, intracellular trafficking, mitochondrial dysfunction, and the ubiquitin–proteasome system. This review summarizes the cellular function and pathophysiology of LRRK2 ROCO domain mutations in PD and the perspective of therapeutic approaches.
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Affiliation(s)
- Meng-Ling Chen
- Department of Life Science, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Da-an Dist, Taipei City, 10617, Taiwan.,Department of Neurology, College of Medicine, National Taiwan University Hospital, National Taiwan University, No. 7, Chung-Shan South Road, Zhongzheng Dist, Taipei City, 10002, Taiwan
| | - Ruey-Meei Wu
- Department of Life Science, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Da-an Dist, Taipei City, 10617, Taiwan. .,Department of Neurology, College of Medicine, National Taiwan University Hospital, National Taiwan University, No. 7, Chung-Shan South Road, Zhongzheng Dist, Taipei City, 10002, Taiwan.
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Detection of endogenous S1292 LRRK2 autophosphorylation in mouse tissue as a readout for kinase activity. NPJ PARKINSONS DISEASE 2018; 4:13. [PMID: 29707617 PMCID: PMC5908918 DOI: 10.1038/s41531-018-0049-1] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 03/16/2018] [Accepted: 03/28/2018] [Indexed: 11/14/2022]
Abstract
Parkinson’s disease-linked mutations in LRRK2 enhance the kinase activity of the protein, therefore targeting LRRK2 kinase activity is a promising therapeutic approach. Phosphorylation at S935 of LRRK2 and of its Rab GTPase substrates have proven very useful biomarkers to monitor its kinase activity. Complementary to these approaches autophosphorylation of LRRK2 can be used as a direct kinase activity readout but to date detection of autophosphorylation at endogenous levels in vivo has been limited. We developed a fractionation-based enrichment method to successfully detect endogenous S1292 LRRK2 autophosphorylation in mouse tissues and highlight S1292 as a physiological readout candidate for LRRK2 kinase activity in vivo.
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P62/SQSTM1 is a novel leucine-rich repeat kinase 2 (LRRK2) substrate that enhances neuronal toxicity. Biochem J 2018. [PMID: 29519959 DOI: 10.1042/bcj20170699] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Autosomal-dominant, missense mutations in the leucine-rich repeat protein kinase 2 (LRRK2) gene are the most common genetic predisposition to develop Parkinson's disease (PD). LRRK2 kinase activity is increased in several pathogenic mutations (N1437H, R1441C/G/H, Y1699C, G2019S), implicating hyperphosphorylation of a substrate in the pathogenesis of the disease. Identification of the downstream targets of LRRK2 is a crucial endeavor in the field to understand LRRK2 pathway dysfunction in the disease. We have identified the signaling adapter protein p62/SQSTM1 as a novel endogenous interacting partner and a substrate of LRRK2. Using mass spectrometry and phospho-specific antibodies, we found that LRRK2 phosphorylates p62 on Thr138 in vitro and in cells. We found that the pathogenic LRRK2 PD-associated mutations (N1437H, R1441C/G/H, Y1699C, G2019S) increase phosphorylation of p62 similar to previously reported substrate Rab proteins. Notably, we found that the pathogenic I2020T mutation and the risk factor mutation G2385R displayed decreased phosphorylation of p62. p62 phosphorylation by LRRK2 is blocked by treatment with selective LRRK2 inhibitors in cells. We also found that the amino-terminus of LRRK2 is crucial for optimal phosphorylation of Rab7L1 and p62 in cells. LRRK2 phosphorylation of Thr138 is dependent on a p62 functional ubiquitin-binding domain at its carboxy-terminus. Co-expression of p62 with LRRK2 G2019S increases the neurotoxicity of this mutation in a manner dependent on Thr138. p62 is an additional novel substrate of LRRK2 that regulates its toxic biology, reveals novel signaling nodes and can be used as a pharmacodynamic marker for LRRK2 kinase activity.
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Howlett EH, Jensen N, Belmonte F, Zafar F, Hu X, Kluss J, Schüle B, Kaufman BA, Greenamyre JT, Sanders LH. LRRK2 G2019S-induced mitochondrial DNA damage is LRRK2 kinase dependent and inhibition restores mtDNA integrity in Parkinson's disease. Hum Mol Genet 2018; 26:4340-4351. [PMID: 28973664 DOI: 10.1093/hmg/ddx320] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 08/10/2017] [Indexed: 12/19/2022] Open
Abstract
Mutations in leucine-rich repeat kinase 2 (LRRK2) are associated with increased risk for developing Parkinson's disease (PD). Previously, we found that LRRK2 G2019S mutation carriers have increased mitochondrial DNA (mtDNA) damage and after zinc finger nuclease-mediated gene mutation correction, mtDNA damage was no longer detectable. While the mtDNA damage phenotype can be unambiguously attributed to the LRRK2 G2019S mutation, the underlying mechanism(s) is unknown. Here, we examine the role of LRRK2 kinase function in LRRK2 G2019S-mediated mtDNA damage, using both genetic and pharmacological approaches in cultured neurons and PD patient-derived cells. Expression of LRRK2 G2019S induced mtDNA damage in primary rat midbrain neurons, but not in cortical neuronal cultures. In contrast, the expression of LRRK2 wild type or LRRK2 D1994A mutant (kinase dead) had no effect on mtDNA damage in either midbrain or cortical neuronal cultures. In addition, human LRRK2 G2019S patient-derived lymphoblastoid cell lines (LCL) demonstrated increased mtDNA damage relative to age-matched controls. Importantly, treatment of LRRK2 G2019S expressing midbrain neurons or patient-derived LRRK2 G2019S LCLs with the LRRK2 kinase inhibitor GNE-7915, either prevented or restored mtDNA damage to control levels. These findings support the hypothesis that LRRK2 G2019S-induced mtDNA damage is LRRK2 kinase activity dependent, uncovering a novel pathological role for this kinase. Blocking or reversing mtDNA damage via LRRK2 kinase inhibition or other therapeutic approaches may be useful to slow PD-associated pathology.
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Affiliation(s)
- Evan H Howlett
- Department of Neurology, Pittsburgh Institute for Neurodegenerative Diseases
| | - Nicholas Jensen
- Department of Neurology, Pittsburgh Institute for Neurodegenerative Diseases
| | - Frances Belmonte
- Department of Medicine, Center for Metabolism and Mitochondrial Medicine, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Faria Zafar
- Parkinson's Institute and Clinical Center, Sunnyvale, CA 94085, USA
| | - Xiaoping Hu
- Department of Neurology, Pittsburgh Institute for Neurodegenerative Diseases
| | - Jillian Kluss
- Department of Neurology, Pittsburgh Institute for Neurodegenerative Diseases
| | - Birgitt Schüle
- Parkinson's Institute and Clinical Center, Sunnyvale, CA 94085, USA
| | - Brett A Kaufman
- Department of Medicine, Center for Metabolism and Mitochondrial Medicine, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - J T Greenamyre
- Department of Neurology, Pittsburgh Institute for Neurodegenerative Diseases
| | - Laurie H Sanders
- Department of Neurology, Duke University Medical Center, Durham, NC 27710, USA
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30
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PFE-360-induced LRRK2 inhibition induces reversible, non-adverse renal changes in rats. Toxicology 2018; 395:15-22. [DOI: 10.1016/j.tox.2018.01.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Revised: 12/22/2017] [Accepted: 01/03/2018] [Indexed: 11/21/2022]
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31
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Abstract
Mutations in the gene encoding leucine-rich repeat kinase 2 (LRRK2) are known today as the most common genetic cause of Parkinson's disease (PD). LRRK2 is a large protein that is hypothesized to regulate other proteins as a scaffold in downstream signaling pathways. This is supported by the multiple domain composition of LRRK2 with several protein-protein interaction domains combined with kinase and GTPase activity. LRRK2 is highly phosphorylated at sites that are strictly controlled by upstream regulators, including its own kinase domain. In cultured cells, most pathogenic mutants display increased autophosphorylation at S1292, but decreased phosphorylation at sites controlled by other kinases. We only begin to understand how LRRK2 phosphorylation is regulated and how this impacts its physiological and pathological function. Intriguingly, LRRK2 kinase inhibition, currently one of the most prevailing disease-modifying therapeutic strategies for PD, induces LRRK2 dephosphorylation at sites that are also dephosphorylated in pathogenic variants. In addition, LRRK2 kinase inhibition can induce LRRK2 protein degradation, which might be related to the observed inhibitor-induced adverse effects on the lung in rodents and non-human primates, as it resembles the lung pathology in LRRK2 knock-out animals. In this review, we will provide an overview of how LRRK2 phosphorylation is regulated and how this complex regulation relates to several molecular and cellular features of LRRK2.
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Affiliation(s)
- Tina De Wit
- 1 Laboratory for Neurobiology and Gene Therapy, Department of Neurosciences, KU Leuven, Leuven, Belgium
| | - Veerle Baekelandt
- 1 Laboratory for Neurobiology and Gene Therapy, Department of Neurosciences, KU Leuven, Leuven, Belgium
| | - Evy Lobbestael
- 1 Laboratory for Neurobiology and Gene Therapy, Department of Neurosciences, KU Leuven, Leuven, Belgium
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32
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Madero-Pérez J, Fdez E, Fernández B, Lara Ordóñez AJ, Blanca Ramírez M, Gómez-Suaga P, Waschbüsch D, Lobbestael E, Baekelandt V, Nairn AC, Ruiz-Martínez J, Aiastui A, López de Munain A, Lis P, Comptdaer T, Taymans JM, Chartier-Harlin MC, Beilina A, Gonnelli A, Cookson MR, Greggio E, Hilfiker S. Parkinson disease-associated mutations in LRRK2 cause centrosomal defects via Rab8a phosphorylation. Mol Neurodegener 2018; 13:3. [PMID: 29357897 PMCID: PMC5778812 DOI: 10.1186/s13024-018-0235-y] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Accepted: 01/12/2018] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Mutations in LRRK2 are a common genetic cause of Parkinson's disease (PD). LRRK2 interacts with and phosphorylates a subset of Rab proteins including Rab8a, a protein which has been implicated in various centrosome-related events. However, the cellular consequences of such phosphorylation remain elusive. METHODS Human neuroblastoma SH-SY5Y cells stably expressing wildtype or pathogenic LRRK2 were used to test for polarity defects in the context of centrosomal positioning. Centrosomal cohesion deficits were analyzed from transiently transfected HEK293T cells, as well as from two distinct peripheral cell types derived from LRRK2-PD patients. Kinase assays, coimmunoprecipitation and GTP binding/retention assays were used to address Rab8a phosphorylation by LRRK2 and its effects in vitro. Transient transfections and siRNA experiments were performed to probe for the implication of Rab8a and its phosphorylated form in the centrosomal deficits caused by pathogenic LRRK2. RESULTS Here, we show that pathogenic LRRK2 causes deficits in centrosomal positioning with effects on neurite outgrowth, cell polarization and directed migration. Pathogenic LRRK2 also causes deficits in centrosome cohesion which can be detected in peripheral cells derived from LRRK2-PD patients as compared to healthy controls, and which are reversed upon LRRK2 kinase inhibition. The centrosomal cohesion and polarity deficits can be mimicked when co-expressing wildtype LRRK2 with wildtype but not phospho-deficient Rab8a. The centrosomal defects induced by pathogenic LRRK2 are associated with a kinase activity-dependent increase in the centrosomal localization of phosphorylated Rab8a, and are prominently reduced upon RNAi of Rab8a. CONCLUSIONS Our findings reveal a new function of LRRK2 mediated by Rab8a phosphorylation and related to various centrosomal defects.
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Affiliation(s)
- Jesús Madero-Pérez
- Institute of Parasitology and Biomedicine "López-Neyra", Consejo Superior de Investigaciones Científicas (CSIC), Avda del Conocimiento s/n, 18016, Granada, Spain
| | - Elena Fdez
- Institute of Parasitology and Biomedicine "López-Neyra", Consejo Superior de Investigaciones Científicas (CSIC), Avda del Conocimiento s/n, 18016, Granada, Spain
| | - Belén Fernández
- Institute of Parasitology and Biomedicine "López-Neyra", Consejo Superior de Investigaciones Científicas (CSIC), Avda del Conocimiento s/n, 18016, Granada, Spain
| | - Antonio J Lara Ordóñez
- Institute of Parasitology and Biomedicine "López-Neyra", Consejo Superior de Investigaciones Científicas (CSIC), Avda del Conocimiento s/n, 18016, Granada, Spain
| | - Marian Blanca Ramírez
- Institute of Parasitology and Biomedicine "López-Neyra", Consejo Superior de Investigaciones Científicas (CSIC), Avda del Conocimiento s/n, 18016, Granada, Spain
| | - Patricia Gómez-Suaga
- Institute of Parasitology and Biomedicine "López-Neyra", Consejo Superior de Investigaciones Científicas (CSIC), Avda del Conocimiento s/n, 18016, Granada, Spain
| | - Dieter Waschbüsch
- Department of Experimental Tumorbiology, Westfälische Wilhelms University Münster, Münster, Germany
| | - Evy Lobbestael
- Laboratory for Neurobiology and Gene Therapy, KU Leuven, 3000, Leuven, Belgium
| | - Veerle Baekelandt
- Laboratory for Neurobiology and Gene Therapy, KU Leuven, 3000, Leuven, Belgium
| | - Angus C Nairn
- Department of Psychiatry, Yale University School of Medicine, New Haven, USA
| | | | - Ana Aiastui
- Cell Culture Platform and Division of Neurosciences, Instituto Biodonostia, San Sebastián, Spain
| | - Adolfo López de Munain
- Division of Neurosciences, Instituto Biodonostia-CIBERNED, San Sebastián, Spain.,Division of Neurosciences, Instituto Biodonostia-CIBERNED, University of the Basque Country UPV-EHU, San Sebastián, Spain
| | - Pawel Lis
- Medical Research Council Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dundee, Scotland, DD1 5EH, UK
| | - Thomas Comptdaer
- University of Lille, Inserm, CHU Lille, UMR-S 1172 - JPArc - Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer, F-59000, Lille, France
| | - Jean-Marc Taymans
- University of Lille, Inserm, CHU Lille, UMR-S 1172 - JPArc - Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer, F-59000, Lille, France
| | - Marie-Christine Chartier-Harlin
- University of Lille, Inserm, CHU Lille, UMR-S 1172 - JPArc - Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer, F-59000, Lille, France
| | - Alexandria Beilina
- Cell Biology and Gene Expression Section, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, MD, USA
| | - Adriano Gonnelli
- Department of Biology, University of Padova, 35131, Padova, Italy
| | - Mark R Cookson
- Cell Biology and Gene Expression Section, Laboratory of Neurogenetics, National Institute on Aging, National Institutes of Health, Bethesda, MD, USA
| | - Elisa Greggio
- Department of Biology, University of Padova, 35131, Padova, Italy
| | - Sabine Hilfiker
- Institute of Parasitology and Biomedicine "López-Neyra", Consejo Superior de Investigaciones Científicas (CSIC), Avda del Conocimiento s/n, 18016, Granada, Spain.
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Back to the future: new target-validated Rab antibodies for evaluating LRRK2 signalling in cell biology and Parkinson's disease. Biochem J 2018; 475:185-189. [PMID: 29305429 PMCID: PMC5754967 DOI: 10.1042/bcj20170870] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 12/05/2017] [Accepted: 12/06/2017] [Indexed: 01/09/2023]
Abstract
The addition of phosphate groups to substrates allows protein kinases to regulate a myriad of biological processes, and contextual analysis of protein-bound phosphate is important for understanding how kinases contribute to physiology and disease. Leucine-rich repeat kinase 2 (LRRK2) is a Ser/Thr kinase linked to familial and sporadic cases of Parkinson's disease (PD). Recent work established that multiple Rab GTPases are physiological substrates of LRRK2, with Rab10 in particular emerging as a human substrate whose site-specific phosphorylation mirrors hyperactive LRRK2 lesions associated with PD. However, current assays to quantify Rab10 phosphorylation are expensive, time-consuming and technically challenging. In back-to-back studies reported in the Biochemical Journal, Alessi and colleagues teamed up with clinical colleagues and collaborators at the Michael J. Fox Foundation (MJFF) for Parkinson's research to develop, and validate, a panel of exquisitely sensitive phospho-specific Rab antibodies. Of particular interest, the monoclonal antibody-designated MJFF-pRAB10 detects phosphorylated Rab 10 on Thr73 in a variety of cells, brain extracts, PD-derived samples and human neutrophils, the latter representing a previously unrecognised biological resource for LRRK2 signalling analysis. In the future, these antibodies could become universal resources in the fight to understand and quantify connections between LRRK2 and Rab proteins, including those associated with clinical PD.
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34
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Selective LRRK2 kinase inhibition reduces phosphorylation of endogenous Rab10 and Rab12 in human peripheral mononuclear blood cells. Sci Rep 2017; 7:10300. [PMID: 28860483 PMCID: PMC5578959 DOI: 10.1038/s41598-017-10501-z] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 08/10/2017] [Indexed: 01/09/2023] Open
Abstract
Genetic variation in the leucine-rich repeat kinase 2 (LRRK2) gene is associated with risk of familial and sporadic Parkinson’s disease (PD). To support clinical development of LRRK2 inhibitors as disease-modifying treatment in PD biomarkers for kinase activity, target engagement and kinase inhibition are prerequisite tools. In a combined proteomics and phosphoproteomics study on human peripheral mononuclear blood cells (PBMCs) treated with the LRRK2 inhibitor Lu AF58786 a number of putative biomarkers were identified. Among the phospho-site hits were known LRRK2 sites as well as two phospho-sites on human Rab10 and Rab12. LRRK2 dependent phosphorylation of human Rab10 and human Rab12 at positions Thr73 and Ser106, respectively, was confirmed in HEK293 and, more importantly, Rab10-pThr73 inhibition was validated in immune stimulated human PBMCs using two distinct LRRK2 inhibitors. In addition, in non-stimulated human PBMCs acute inhibition of LRRK2 with two distinct LRRK2 inhibitor compounds reduced Rab10-Thr73 phosphorylation in a concentration-dependent manner with apparent IC50’s equivalent to IC50’s on LRRK2-pSer935. The identification of Rab10 phosphorylated at Thr73 as a LRRK2 inhibition marker in human PBMCs strongly support inclusion of assays quantifying Rab10-pThr73 levels in upcoming clinical trials evaluating LRRK2 kinase inhibition as a disease-modifying treatment principle in PD.
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35
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A proteomic analysis of LRRK2 binding partners reveals interactions with multiple signaling components of the WNT/PCP pathway. Mol Neurodegener 2017; 12:54. [PMID: 28697798 PMCID: PMC5505151 DOI: 10.1186/s13024-017-0193-9] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 06/20/2017] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND Autosomal-dominant mutations in the Park8 gene encoding Leucine-rich repeat kinase 2 (LRRK2) have been identified to cause up to 40% of the genetic forms of Parkinson's disease. However, the function and molecular pathways regulated by LRRK2 are largely unknown. It has been shown that LRRK2 serves as a scaffold during activation of WNT/β-catenin signaling via its interaction with the β-catenin destruction complex, DVL1-3 and LRP6. In this study, we examine whether LRRK2 also interacts with signaling components of the WNT/Planar Cell Polarity (WNT/PCP) pathway, which controls the maturation of substantia nigra dopaminergic neurons, the main cell type lost in Parkinson's disease patients. METHODS Co-immunoprecipitation and tandem mass spectrometry was performed in a mouse substantia nigra cell line (SN4741) and human HEK293T cell line in order to identify novel LRRK2 binding partners. Inhibition of the WNT/β-catenin reporter, TOPFlash, was used as a read-out of WNT/PCP pathway activation. The capacity of LRRK2 to regulate WNT/PCP signaling in vivo was tested in Xenopus laevis' early development. RESULTS Our proteomic analysis identified that LRRK2 interacts with proteins involved in WNT/PCP signaling such as the PDZ domain-containing protein GIPC1 and Integrin-linked kinase (ILK) in dopaminergic cells in vitro and in the mouse ventral midbrain in vivo. Moreover, co-immunoprecipitation analysis revealed that LRRK2 binds to two core components of the WNT/PCP signaling pathway, PRICKLE1 and CELSR1, as well as to FLOTILLIN-2 and CULLIN-3, which regulate WNT secretion and inhibit WNT/β-catenin signaling, respectively. We also found that PRICKLE1 and LRRK2 localize in signalosomes and act as dual regulators of WNT/PCP and β-catenin signaling. Accordingly, analysis of the function of LRRK2 in vivo, in X. laevis revelaed that LRKK2 not only inhibits WNT/β-catenin pathway, but induces a classical WNT/PCP phenotype in vivo. CONCLUSIONS Our study shows for the first time that LRRK2 activates the WNT/PCP signaling pathway through its interaction to multiple WNT/PCP components. We suggest that LRRK2 regulates the balance between WNT/β-catenin and WNT/PCP signaling, depending on the binding partners. Since this balance is crucial for homeostasis of midbrain dopaminergic neurons, we hypothesize that its alteration may contribute to the pathophysiology of Parkinson's disease.
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Giesert F, Glasl L, Zimprich A, Ernst L, Piccoli G, Stautner C, Zerle J, Hölter SM, Vogt Weisenhorn DM, Wurst W. The pathogenic LRRK2 R1441C mutation induces specific deficits modeling the prodromal phase of Parkinson's disease in the mouse. Neurobiol Dis 2017; 105:179-193. [PMID: 28576705 DOI: 10.1016/j.nbd.2017.05.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Revised: 05/13/2017] [Accepted: 05/29/2017] [Indexed: 12/11/2022] Open
Abstract
The aim of the present study was to further explore the in vivo function of the Leucine-rich repeat kinase 2 (LRRK2)-gene, which is mutated in certain familial forms of Parkinson's disease (PD). We generated a mouse model harboring the disease-associated point mutation R1441C in the GTPase domain of the endogenous murine LRRK2 gene (LRRK2 R1441C line) and performed a comprehensive analysis of these animals throughout lifespan in comparison with an existing knockdown line of LRRK2 (LRRK2 knockdown line). Animals of both lines do not exhibit severe motor dysfunction or pathological signs of neurodegeneration neither at young nor old age. However, at old age the homozygous LRRK2 R1441C animals exhibit clear phenotypes related to the prodromal phase of PD such as impairments in fine motor tasks, gait, and olfaction. These phenotypes are only marginally observable in the LRRK2 knockdown animals, possibly due to activation of compensatory mechanisms as suggested by in vitro studies of synaptic transmission. Thus, at the organismal level the LRRK2 R1441C mutation does not emerge as a loss of function of the protein, but induces mutation specific deficits. Furthermore, judged by the phenotypes presented, the LRRK2-R1441C knock-in line is a valid preclinical model for the prodromal phase of PD.
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Affiliation(s)
- F Giesert
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Developmental Genetics, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany; Technische Universität München-Weihenstephan, Lehrstuhl für Entwicklungsgenetik, c/o Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
| | - L Glasl
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Developmental Genetics, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
| | - A Zimprich
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Developmental Genetics, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
| | - L Ernst
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Developmental Genetics, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
| | - G Piccoli
- Center for Integrative Biology (CIBIO), University of Trento and Dulbecco Telethon Institute Trento, Italy
| | - C Stautner
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Developmental Genetics, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
| | - J Zerle
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Developmental Genetics, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
| | - S M Hölter
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Developmental Genetics, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
| | - D M Vogt Weisenhorn
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Developmental Genetics, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany; Technische Universität München-Weihenstephan, Lehrstuhl für Entwicklungsgenetik, c/o Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
| | - W Wurst
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Developmental Genetics, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany; Technische Universität München-Weihenstephan, Lehrstuhl für Entwicklungsgenetik, c/o Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany; Munich Cluster for Systems Neurology (SyNergy), Feodor-Lynen-Str. 17, 81377 Munich, Germany; Deutsches Zentrum für Neurodegenerative Erkrankungen e. V. (DZNE), Standort München, Feodor-Lynen-Str. 17, 81377 München, Germany.
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Longo F, Mercatelli D, Novello S, Arcuri L, Brugnoli A, Vincenzi F, Russo I, Berti G, Mabrouk OS, Kennedy RT, Shimshek DR, Varani K, Bubacco L, Greggio E, Morari M. Age-dependent dopamine transporter dysfunction and Serine129 phospho-α-synuclein overload in G2019S LRRK2 mice. Acta Neuropathol Commun 2017; 5:22. [PMID: 28292328 PMCID: PMC5351259 DOI: 10.1186/s40478-017-0426-8] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 03/08/2017] [Indexed: 12/13/2022] Open
Abstract
Mutations in the leucine-rich repeat kinase 2 (LRRK2) gene are the most common genetic cause of Parkinson’s disease. Here, we investigated whether the G2019S LRRK2 mutation causes morphological and/or functional changes at nigro-striatal dopamine neurons. Density of striatal dopaminergic terminals, nigral cell counts, tyrosine hydroxylase protein levels as well as exocytotic dopamine release measured in striatal synaptosomes, or striatal extracellular dopamine levels monitored by in vivo microdialysis were similar between ≥12-month-old G2019S knock-in mice and wild-type controls. In vivo striatal dopamine release was insensitive to the LRRK2 inhibitor Nov-LRRK2-11, and was elevated by the membrane dopamine transporter blocker GBR-12783. However, G2019S knock-in mice showed a blunted neurochemical and motor activation response to GBR-12783 compared to wild-type controls. Western blot and dopamine uptake analysis revealed an increase in dopamine transporter levels and activity in the striatum of 12-month-old G2019S KI mice. This phenotype correlated with a reduction in vesicular monoamine transporter 2 levels and an enhancement of vesicular dopamine uptake, which was consistent with greater resistance to reserpine-induced hypolocomotion. These changes were not observed in 3-month-old mice. Finally, Western blot analysis revealed no genotype difference in striatal levels of endogenous α-synuclein or α-synuclein bound to DOPAL (a toxic metabolite of dopamine). However, Serine129-phosphorylated α-synuclein levels were higher in 12-month-old G2019S knock-in mice. Immunohistochemistry confirmed this finding, also showing no genotype difference in 3-month-old mice. We conclude that the G2019S mutation causes progressive dysfunctions of dopamine transporters, along with Serine129-phosphorylated α-synuclein overload, at striatal dopaminergic terminals, which are not associated with dopamine homeostasis dysregulation or neuron loss but might contribute to intrinsic dopaminergic terminal vulnerability. We propose G2019S knock-in mice as a presymptomatic Parkinson’s disease model, useful to investigate the pathogenic interaction among genetics, aging, and internal or environmental factors leading to the disease.
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Martin I. Decoding Parkinson's Disease Pathogenesis: The Role of Deregulated mRNA Translation. JOURNAL OF PARKINSONS DISEASE 2017; 6:17-27. [PMID: 26889638 PMCID: PMC4927901 DOI: 10.3233/jpd-150738] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Mutations in a number of genes cause rare familial forms of Parkinson’s disease and provide profound insight into potential mechanisms governing disease pathogenesis. Recently, a role for translation and metabolism of mRNA has emerged in the development of various neurodegenerative disorders including Parkinson’s disease (PD). In PD, preliminary evidence supports a role for aberrant translation in the disease process stemming from mutations in several genes. Translation control is central to maintaining organism homeostasis under variable environmental conditions and deregulation of this may predispose to certain stressors. Hypothetically, deregulated translation may be detrimental to neuronal viability in PD through the misexpression of a subset of transcripts or through the impact of excessive bulk translation on energy consumption and burden on protein homeostatic mechanisms. While compelling preliminary evidence exists to support a role for translation in PD, much more work is required to identify specific mechanisms linking altered translation to the disease process.
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Affiliation(s)
- Ian Martin
- Correspondence to: Ian Martin, PhD Jungers Center for Neurosciences Research Parkinson Center of Oregon Department of Neurology - Mail Code L623 Oregon Health and Science University 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA. Tel.: +1 503 494 9140; Fax: +1 503 494 7358; E-mail:
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Rideout HJ, Re DB. LRRK2 and the "LRRKtosome" at the Crossroads of Programmed Cell Death: Clues from RIP Kinase Relatives. ADVANCES IN NEUROBIOLOGY 2017; 14:193-208. [PMID: 28353285 DOI: 10.1007/978-3-319-49969-7_10] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Since its cloning and identification in 2004, considerable gains have been made in the understanding of the basic functionality of leucine-rich repeat kinase 2 (LRRK2), including its kinase and GTPase activities, its protein interactors and subcellular localization, and its expression in the CNS and peripheral tissues. However, the mechanism(s) by which expression of mutant forms of LRRK2 lead to the death of dopaminergic neurons of the ventral midbrain remains largely uncharacterized. Because of its complex domain structure, LRRK2 exhibits similarities with multiple protein families including ROCO proteins, as well as the RIP kinases. Cellular models in which mutant LRRK2 is overexpressed in neuronal-like cell lines or in primary neurons have found evidence of apoptotic cell death involving components of the extrinsic as well as intrinsic death pathways. However, since the expression of LRRK2 is comparatively quite low in ventral midbrain dopaminergic neurons, the possibility exists that non-cell autonomous signaling also contributes to the loss of these neurons. In this chapter, we will discuss the different neuronal death pathways that may be activated by mutant forms of LRRK2, guided in part by the behavior of other members of the RIP kinase protein family.
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Affiliation(s)
- Hardy J Rideout
- Division of Basic Neurosciences, Biomedical Research Foundation of the Academy of Athens, Soranou Efessiou 4, Athens, 115 27, Greece.
| | - Diane B Re
- EHS Department and Motor Neuron Center, Columbia University, 722 W 168th Street Suite 1107-b, New York, NY, 10032, USA
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Abstract
LRRK2 is a highly phosphorylated protein, and evidence of a physiological role for LRRK2 phosphorylation has accumulated in recent years for cellular phosphosites, many of which are found in the ANK-LRR interdomain region, i.e., the S910/S935/S955/S973 sites as well as recently for autophosphorylation sites, at least one of which has been confirmed in cells, S1292. LRRK2 phosphorylation is modulated in several disease or potential therapy relevant conditions such as in disease mutant variants of LRRK2 or following LRRK2 kinase inhibitor treatment. This chapter will focus on the regulation of LRRK2 phosphorylation and more specifically the role of phosphatases in LRRK2 dephosphorylation. This will include reviewing the conditions in which LRRK2 is found to be dephosphorylated, the molecular partners and phosphatases involved in regulating LRRK2 phosphorylation, as well as discussing how LRRK2 phosphatases may be therapeutic targets or biomarkers in their own right.
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Affiliation(s)
- Jean-Marc Taymans
- Université de Lille, Inserm, CHU Lille, UMR-S 1172-JPARC Jean-Pierre Aubert Research Center, Neurosciences and Cancer, 1 Place de Verdun, Lille, 59000, France.
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L'RRK de Triomphe: a solution for LRRK2 GTPase activity? Biochem Soc Trans 2016; 44:1625-1634. [DOI: 10.1042/bst20160240] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 09/15/2016] [Accepted: 09/23/2016] [Indexed: 01/01/2023]
Abstract
Leucine-rich repeat kinase 2 (LRRK2) is a central protein in the pathogenesis of Parkinson's disease (PD), yet its normal function has proved stubbornly hard to elucidate. Even though it remains unclear how pathogenic mutations affect LRRK2 to cause PD, recent findings provide increasing cause for optimism. We summarise here the developing consensus over the effect of pathogenic mutations in the Ras of complex proteins and C-terminal of Roc domains on LRRK2 GTPase activity. This body of work has been greatly reinforced by our own study of the protective R1398H variant contained within the LRRK2 GTPase domain. Collectively, data point towards the pathogenicity of GTP-bound LRRK2 and strengthen a working model for LRRK2 GTPase function as a GTPase activated by dimerisation. Together with the identification of the protective R1398H variant as a valuable control for pathogenic mutations, we have no doubt that these triumphs for the LRRK2 field will accelerate research towards resolving LRRK2 function and towards new treatments for PD.
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Melachroinou K, Leandrou E, Valkimadi PE, Memou A, Hadjigeorgiou G, Stefanis L, Rideout HJ. Activation of FADD-Dependent Neuronal Death Pathways as a Predictor of Pathogenicity for LRRK2 Mutations. PLoS One 2016; 11:e0166053. [PMID: 27832104 PMCID: PMC5104429 DOI: 10.1371/journal.pone.0166053] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 10/21/2016] [Indexed: 01/24/2023] Open
Abstract
Background Despite the plethora of sequence variants in LRRK2, only a few clearly segregate with PD. Even within this group of pathogenic mutations, the phenotypic profile can differ widely. Objective We examined multiple properties of LRRK2 behavior in cellular models over-expressing three sequence variants described in Greek PD patients in comparison to several known pathogenic and non-pathogenic LRRK2 mutations, to determine if specific phenotypes associated with pathogenic LRRK2 can be observed in other less-common sequence variants for which pathogenicity is unclear based on clinical and/or genetic data alone. Methods The oligomerization, activity, phosphorylation, and interaction with FADD was assessed in HEK293T cells over-expressing LRRK2; while the induction of neuronal death was determined by quantifying apoptotic nuclei in primary neurons transiently expressing LRRK2. Results One LRRK2 variant, A211V, exhibited a modest increase in kinase activity, whereas only the pathogenic mutants G2019S and I2020T displayed significantly altered auto-phosphorylation. We observed an induction of detergent-insoluble high molecular weight structures upon expression of pathogenic LRRK2 mutants, but not the other LRRK2 variants. In contrast, each of the variants tested induced apoptotic death of cultured neurons similar to pathogenic LRRK2 in a FADD-dependent manner. Conclusions Overall, despite differences in some properties of LRRK2 function such as kinase activity and its oligomerization, each of the LRRK2 variants examined induced neuronal death to a similar extent. Furthermore, our findings further strengthen the notion of a convergence on the extrinsic cell death pathway common to mutations in LRRK2 that are capable of inducing neuronal death.
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Affiliation(s)
- Katerina Melachroinou
- Division of Basic Neurosciences, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
| | - Emmanouela Leandrou
- Division of Basic Neurosciences, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
| | - Polytimi-Eleni Valkimadi
- Division of Basic Neurosciences, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
| | - Anna Memou
- Division of Basic Neurosciences, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
| | - Georgios Hadjigeorgiou
- Department of Neurogenetics, Institute of Biomedical Research & Technology (CERETETH), Larissa, Greece
- Department of Neurology, University of Thessaly School of Medicine, Larissa, Greece
| | - Leonidas Stefanis
- Division of Basic Neurosciences, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
- Second Department of Neurology, University of Athens Medical School, Athens, Greece
| | - Hardy J. Rideout
- Division of Basic Neurosciences, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
- * E-mail:
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Speidel A, Felk S, Reinhardt P, Sterneckert J, Gillardon F. Leucine-Rich Repeat Kinase 2 Influences Fate Decision of Human Monocytes Differentiated from Induced Pluripotent Stem Cells. PLoS One 2016; 11:e0165949. [PMID: 27812199 PMCID: PMC5094768 DOI: 10.1371/journal.pone.0165949] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 10/20/2016] [Indexed: 12/15/2022] Open
Abstract
Mutations in Leucine-rich repeat kinase 2 (LRRK2) are strongly associated with familial Parkinson’s disease (PD). High expression levels in immune cells suggest a role of LRRK2 in regulating the immune system. In this study, we investigated the effect of the LRRK2 (G2019S) mutation in monocytes, using a human stem cell-derived model expressing LRRK2 at endogenous levels. We discovered alterations in the differentiation pattern of LRRK2 mutant, compared to non-mutant isogenic controls, leading to accelerated monocyte production and a reduction in the non-classical CD14+CD16+ monocyte subpopulation in the LRRK2 mutant cells. LPS-treatment of the iPSC-derived monocytes significantly increased the release of pro-inflammatory cytokines, demonstrating a functional response without revealing any significant differences between the genotypes. Assessment of the migrational capacity of the differentiated monocytes revealed moderate deficits in LRRK2 mutant cells, compared to their respective controls. Our findings indicate a pivotal role of LRRK2 in hematopoietic fate decision, endorsing the involvement of the immune system in the development of PD.
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Affiliation(s)
- Anna Speidel
- CNS Diseases Research, Boehringer Ingelheim Pharma GmbH & Co. KG, Biberach an der Riss, Germany
| | - Sandra Felk
- CNS Diseases Research, Boehringer Ingelheim Pharma GmbH & Co. KG, Biberach an der Riss, Germany
| | - Peter Reinhardt
- CRTD / DFG-Center for Regenerative Therapies Dresden, Dresden, Germany
| | - Jared Sterneckert
- CRTD / DFG-Center for Regenerative Therapies Dresden, Dresden, Germany
| | - Frank Gillardon
- CNS Diseases Research, Boehringer Ingelheim Pharma GmbH & Co. KG, Biberach an der Riss, Germany
- * E-mail:
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Lobbestael E, Civiero L, De Wit T, Taymans JM, Greggio E, Baekelandt V. Pharmacological LRRK2 kinase inhibition induces LRRK2 protein destabilization and proteasomal degradation. Sci Rep 2016; 6:33897. [PMID: 27658356 PMCID: PMC5034242 DOI: 10.1038/srep33897] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 09/06/2016] [Indexed: 02/07/2023] Open
Abstract
Leucine-rich repeat kinase 2 (LRRK2) kinase activity is increased in several pathogenic mutations, including the most common mutation, G2019S, and is known to play a role in Parkinson’s disease (PD) pathobiology. This has stimulated the development of potent, selective LRRK2 kinase inhibitors as one of the most prevailing disease-modifying therapeutic PD strategies. Although several lines of evidence support beneficial effects of LRRK2 kinase inhibitors, many questions need to be answered before clinical applications can be envisaged. Using six different LRRK2 kinase inhibitors, we show that LRRK2 kinase inhibition induces LRRK2 dephosphorylation and can reduce LRRK2 protein levels of overexpressed wild type and G2019S, but not A2016T or K1906M, LRRK2 as well as endogenous LRRK2 in mouse brain, lung and kidney. The inhibitor-induced reduction in LRRK2 levels could be reversed by proteasomal inhibition, but not by lysosomal inhibition, while mRNA levels remained unaffected. In addition, using LRRK2 S910A and S935A phosphorylation mutants, we show that dephosphorylation of these sites is not required for LRRK2 degradation. Increasing our insight in the molecular and cellular consequences of LRRK2 kinase inhibition will be crucial in the further development of LRRK2-based PD therapies.
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Affiliation(s)
- E Lobbestael
- Laboratory for Neurobiology and Gene Therapy, Department of Neurosciences, KU Leuven, Kapucijnenvoer 33, 3000 Leuven, Belgium
| | - L Civiero
- Department of Biology, University of Padova, 35131 Padova, Italy
| | - T De Wit
- Laboratory for Neurobiology and Gene Therapy, Department of Neurosciences, KU Leuven, Kapucijnenvoer 33, 3000 Leuven, Belgium
| | - J-M Taymans
- UMR-S1172 Jean-Pierre Aubert Research Center - (INSERM - CHRU de Lille - Université de Lille), Early Stages of Parkinson's Disease Team, Lille, France
| | - E Greggio
- Department of Biology, University of Padova, 35131 Padova, Italy
| | - V Baekelandt
- Laboratory for Neurobiology and Gene Therapy, Department of Neurosciences, KU Leuven, Kapucijnenvoer 33, 3000 Leuven, Belgium
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Activation Mechanism of LRRK2 and Its Cellular Functions in Parkinson's Disease. PARKINSONS DISEASE 2016; 2016:7351985. [PMID: 27293958 PMCID: PMC4880697 DOI: 10.1155/2016/7351985] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/24/2015] [Accepted: 04/19/2016] [Indexed: 01/09/2023]
Abstract
Human LRRK2 (Leucine-Rich Repeat Kinase 2) has been associated with both familial and idiopathic Parkinson's disease (PD). Although several LRRK2 mediated pathways and interaction partners have been identified, the cellular functions of LRRK2 and LRRK2 mediated progression of PD are still only partially understood. LRRK2 belongs to the group of Roco proteins which are characterized by the presence of a Ras-like G-domain (Roc), a C-terminal of Roc domain (COR), a kinase, and several protein-protein interaction domains. Roco proteins exhibit a complex activation mechanism involving intramolecular signaling, dimerization, and substrate/effector binding. Importantly, PD mutations in LRRK2 have been linked to a decreased GTPase and impaired kinase activity, thus providing putative therapeutic targets. To fully explore these potential targets it will be crucial to understand the function and identify the pathways responsible for LRRK2-linked PD. Here, we review the recent progress in elucidating the complex LRRK2 activation mechanism, describe the accumulating evidence that link LRRK2-mediated PD to mitochondrial dysfunction and aberrant autophagy, and discuss possible ways for therapeutically targeting LRRK2.
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West AB, Cookson MR. Identification of bona-fide LRRK2 kinase substrates. Mov Disord 2016; 31:1140-1. [PMID: 27126091 DOI: 10.1002/mds.26647] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Accepted: 03/09/2016] [Indexed: 12/11/2022] Open
Affiliation(s)
- Andrew B West
- Center for Neurodegeneration and Experimental Therapeutics, Department of Neurology, The University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Mark R Cookson
- Cell Biology and Gene Expression Section, Laboratory of Neurogenetics, National Institute on Aging, Bethesda, Maryland, USA
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Belluzzi E, Gonnelli A, Cirnaru MD, Marte A, Plotegher N, Russo I, Civiero L, Cogo S, Carrion MP, Franchin C, Arrigoni G, Beltramini M, Bubacco L, Onofri F, Piccoli G, Greggio E. LRRK2 phosphorylates pre-synaptic N-ethylmaleimide sensitive fusion (NSF) protein enhancing its ATPase activity and SNARE complex disassembling rate. Mol Neurodegener 2016; 11:1. [PMID: 26758690 PMCID: PMC4711005 DOI: 10.1186/s13024-015-0066-z] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 12/22/2015] [Indexed: 11/10/2022] Open
Abstract
Background Lrrk2, a gene linked to Parkinson’s disease, encodes a large scaffolding protein with kinase and GTPase activities implicated in vesicle and cytoskeletal-related processes. At the presynaptic site, LRRK2 associates with synaptic vesicles through interaction with a panel of presynaptic proteins. Results Here, we show that LRRK2 kinase activity influences the dynamics of synaptic vesicle fusion. We therefore investigated whether LRRK2 phosphorylates component(s) of the exo/endocytosis machinery. We have previously observed that LRRK2 interacts with NSF, a hexameric AAA+ ATPase that couples ATP hydrolysis to the disassembling of SNARE proteins allowing them to enter another fusion cycle during synaptic exocytosis. Here, we demonstrate that NSF is a substrate of LRRK2 kinase activity. LRRK2 phosphorylates full-length NSF at threonine 645 in the ATP binding pocket of D2 domain. Functionally, NSF phosphorylated by LRRK2 displays enhanced ATPase activity and increased rate of SNARE complex disassembling. Substitution of threonine 645 with alanine abrogates LRRK2-mediated increased ATPase activity. Conclusions Given that the most common Parkinson’s disease LRRK2 G2019S mutation displays increased kinase activity, our results suggest that mutant LRRK2 may impair synaptic vesicle dynamics via aberrant phosphorylation of NSF. Electronic supplementary material The online version of this article (doi:10.1186/s13024-015-0066-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Elisa Belluzzi
- Department of Biology, University of Padova, via Ugo Bassi 58/B, 35131, Padova, Italy. .,Present Address: Rheumatology Unit, Department of Medicine - DIMED, University Hospital of Padova, Padova, Italy.
| | - Adriano Gonnelli
- Department of Biology, University of Padova, via Ugo Bassi 58/B, 35131, Padova, Italy.
| | | | - Antonella Marte
- Department of Experimental Medicine, University of Genova, Genova, Italy.
| | - Nicoletta Plotegher
- Department of Biology, University of Padova, via Ugo Bassi 58/B, 35131, Padova, Italy. .,Present Address: Department of Cell and Developmental Biology, University College London, London, WC1E 6BT, UK.
| | - Isabella Russo
- Department of Biology, University of Padova, via Ugo Bassi 58/B, 35131, Padova, Italy.
| | - Laura Civiero
- Department of Biology, University of Padova, via Ugo Bassi 58/B, 35131, Padova, Italy.
| | - Susanna Cogo
- Department of Biology, University of Padova, via Ugo Bassi 58/B, 35131, Padova, Italy.
| | - Maria Perèz Carrion
- San Raffaele Scientific Park & University Vita-Salute San Raffaele, Milan, Italy.
| | - Cinzia Franchin
- Department of Biomedical Sciences, University of Padova, Padova, Italy. .,Proteomics Center of Padova University, Padova, Italy.
| | - Giorgio Arrigoni
- Department of Biomedical Sciences, University of Padova, Padova, Italy. .,Proteomics Center of Padova University, Padova, Italy.
| | - Mariano Beltramini
- Department of Biology, University of Padova, via Ugo Bassi 58/B, 35131, Padova, Italy.
| | - Luigi Bubacco
- Department of Biology, University of Padova, via Ugo Bassi 58/B, 35131, Padova, Italy.
| | - Franco Onofri
- Department of Experimental Medicine, University of Genova, Genova, Italy.
| | - Giovanni Piccoli
- San Raffaele Scientific Park & University Vita-Salute San Raffaele, Milan, Italy. .,IN-CNR Milano, Milano, Italy.
| | - Elisa Greggio
- Department of Biology, University of Padova, via Ugo Bassi 58/B, 35131, Padova, Italy.
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Taymans JM, Greggio E. LRRK2 Kinase Inhibition as a Therapeutic Strategy for Parkinson's Disease, Where Do We Stand? Curr Neuropharmacol 2016; 14:214-25. [PMID: 26517051 PMCID: PMC4857626 DOI: 10.2174/1570159x13666151030102847] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 06/17/2015] [Accepted: 06/17/2015] [Indexed: 12/17/2022] Open
Abstract
One of the most promising therapeutic targets for potential disease-modifying treatment of Parkinson's disease (PD) is leucine-rich repeat kinase 2 (LRRK2). Specifically, targeting LRRK2's kinase function has generated a lot of interest from both industry and academia. This work has yielded several published studies showing the feasibility of developing potent, selective and brain permeable LRRK2 kinase inhibitors. The availability of these experimental drugs is contributing to filling in the gaps in our knowledge on the safety and efficacy of LRRK2 kinase inhibition. Recent studies of LRRK2 kinase inhibition in preclinical models point to potential undesired effects in peripheral tissues such as lung and kidney. Also, while strategies are now emerging to measure target engagement of LRRK2 inhibitors, there remains an important need to expand efficacy studies in preclinical models of progressive PD. Future work in the LRRK2 inhibition field must therefore be directed towards developing molecules and treatment regimens which demonstrate efficacy in mammalian models of disease in conditions where safety liabilities are reduced to a minimum.
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Affiliation(s)
- Jean-Marc Taymans
- Jean-Pierre Aubert Research Center, UMR-S1172,rue Polonovski - 1 place de Verdun, 59045 Lille, France.
| | - Elisa Greggio
- Department of Biology, University of Padova, 35131, Padova, Italy.
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Abstract
Pathogenic mutations and risk variants in LRRK2 (leucine-rich repeat kinase 2) represent the most common genetic cause of familial and sporadic PD (Parkinson's disease). LRRK2 protein is widely expressed throughout the brain and the periphery. Structurally, LRRK2 contains several functional domains, including a dual enzymatic core consisting of a kinase and GTPase domain. Disease-linked variants are found in both these enzymatic domains as well as in the COR [C-terminal of ROC (Ras of complex proteins)] and WD40 protein–protein binding domain. The kinase domain is widely believed to be linked to toxicity, and thus the thrust of pharmaceutical effort has focused on developing LRRK2 kinase inhibitors. However, recent data have suggested that inhibition of LRRK2 activity results in reduced LRRK2 levels and peripheral side effects, which are similar to those observed in homozygous LRRK2-knockout and LRRK2 kinase-dead rodent models. In a recent issue of the Biochemical Journal, a study led by Nichols reveals that dephosphorylation of LRRK2 cellular phosphorylation sites (Ser910/Ser935/Ser955/Ser973) triggers its ubiquitination and subsequent degradation and thus may account for the loss of function phenotypes observed in peripheral tissues in LRRK2-knockout/kinase-dead or inhibitor-treated rodents and primates. Albeit negative from a kinase inhibitor standpoint, the data open new avenues for LRRK2 biology and therapeutic approaches to counteract LRRK2 toxicity.
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