Abstract
The transient receptor potential mucolipin (TRPML) subfamily of transient receptor potential cation channels consists of three members (TRPML1-3) that function at various stages of endocytosis. Conventional research in the TRPML field suggests that dysfunction along these endocytic stages underlies the severe psychomotor impairment in mucolipidosis type IV (MLIV). However, recent studies intimate that TRPMLs may be implicated in other neuropathological disorders as well. This review follows the historical development of TRPML research from the clinical description of the first MLIV patient until present-day characterization of TRPML1-based defects in MLIV on the molecular and cell biological levels. In addition, the aberrant role of TRPML3 in varitint-waddler mouse pathology is elucidated and the normal function of the protein and its paralogs are described. TRPML electrophysiology, pharmacology, and animal models are discussed and TRPML-associated systemic and neurological disorders, not including MLIV, are also addressed. Recently, a number of prospective TRPML-based therapies have been proposed in the treatment of these disorders. These prospects are carefully considered here as well. Altogether, the aforementioned descriptions aim to highlight the transformation of TRPML research from a single discipline, single gene, and single disorder field into a multidisciplinary, multigene endeavor with wide application to therapeutic treatment of several neurobiological disorders.
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References
Cloudman AM, Bunker LE Jr (1945) The varitint-waddler mouse: a dominant mutation in Mus musculus. J Hered 36:259–263
Lane PW (1972) Two new mutations in linkage group XVI of the house mouse. Flaky tail and varitint-waddler-J. J Hered 63:135–140
Berman ER et al (1974) Congenital corneal clouding with abnormal systemic storage bodies: a new variant of mucolipidosis. J Pediatr 84:519–526
Amir N, Zlotogora J, Bach G (1987) Mucolipidosis type IV: clinical spectrum and natural history. Pediatrics 79:953–959
Zeevi DA, Frumkin A, Bach G (2007) TRPML and lysosomal function. Biochim Biophys Acta 1772:851–858
Wakabayashi K et al (2011) Mucolipidosis type IV: an update. Mol Genet Metab 104(3): 206–213
Altarescu G et al (2002) The neurogenetics of mucolipidosis type IV. Neurology 59: 306–313
Alroy J, Ucci AA (2006) Skin biopsy: a useful tool in the diagnosis of lysosomal storage diseases. Ultrastruct Pathol 30:489–503
Slaugenhaupt SA et al (1999) Mapping of the mucolipidosis type IV gene to chromosome 19p and definition of founder haplotypes. Am J Hum Genet 65:773–778
Bargal R et al (2000) Identification of the gene causing mucolipidosis type IV. Nat Genet 26:118–123
Bassi MT et al (2000) Cloning of the gene encoding a novel integral membrane protein, mucolipidin-and identification of the two major founder mutations causing mucolipidosis type IV. Am J Hum Genet 67:1110–1120
Sun M et al (2000) Mucolipidosis type IV is caused by mutations in a gene encoding a novel transient receptor potential channel. Hum Mol Genet 9:2471–2478
Kiselyov K et al (2005) TRP-ML1 is a lysosomal monovalent cation channel that undergoes proteolytic cleavage. J Biol Chem 280: 43218–43223
Zeevi DA et al (2009) A potentially dynamic lysosomal role for the endogenous TRPML proteins. J Pathol 219:153–162
Bach G (2001) Mucolipidosis type IV. Mol Genet Metab 73:197–203
Bargal R et al (2001) Mucolipidosis type IV: novel MCOLN1 mutations in Jewish and non-Jewish patients and the frequency of the disease in the Ashkenazi Jewish population. Hum Mutat 17:397–402
Kim HJ, Jackson T, Noben-Trauth K (2003) Genetic analyses of the mouse deafness mutations varitint-waddler (Va) and jerker (Espnje). J Assoc Res Otolaryngol 4:83–90
Di PF et al (2002) Mutations in Mcoln3 associated with deafness and pigmentation defects in varitint-waddler (Va) mice. Proc Natl Acad Sci USA 99:14994–14999
van Aken AF et al (2008) TRPML3 mutations cause impaired mechano-electrical transduction and depolarization by an inward-rectifier cation current in auditory hair cells of varitint-waddler mice. J Physiol 586:5403–5418
Xu H et al (2007) Activating mutation in a mucolipin transient receptor potential channel leads to melanocyte loss in varitint-waddler mice. Proc Natl Acad Sci USA 104: 18321–18326
Grimm C et al (2007) A helix-breaking mutation in TRPML3 leads to constitutive activity underlying deafness in the varitint-waddler mouse. Proc Natl Acad Sci USA 104: 19583–19588
Kim HJ et al (2007) Gain-of-function mutation in TRPML3 causes the mouse varitint-waddler phenotype. J Biol Chem 282: 36138–36142
Nagata K et al (2008) The varitint-waddler (Va) deafness mutation in TRPML3 generates constitutive, inward rectifying currents and causes cell degeneration. Proc Natl Acad Sci USA 105:353–358
Grimm C, Jors S, Heller S (2009) Life and death of sensory hair cells expressing constitutively active TRPML3. J Biol Chem 284: 13823–13831
Kim HJ et al (2008) A novel mode of TRPML3 regulation by extracytosolic PH absent in the varitint-waddler phenotype. EMBO J 27:1197–1205
Kim HJ et al (2010) Properties of the TRPML3 channel pore and its stable expansion by the varitint-waddler-causing mutation. J Biol Chem 285:16513–16520
Steel KP (2002) Varitint-waddler: a double whammy for hearing. Proc Natl Acad Sci USA 99:14613–14615
Jors S et al (2010) Genetic inactivation of Trpml3 does not lead to hearing and vestibular impairment in mice. PLoS One 5:e14317
Slaugenhaupt SA (2002) The molecular basis of mucolipidosis type IV. Curr Mol Med 2:445–450
Bach G, Cohen MM, Kohn G (1975) Abnormal ganglioside accumulation in cultured fibroblasts from patients with mucolipidosis IV. Biochem Biophys Res Commun 66:1483–1490
Bach G et al (1977) Mucopolysaccharide accumulation in cultured skin fibroblasts derived from patients with mucolipidosis IV. Am J Hum Genet 29:610–618
Bargal R, Bach G (1988) Phospholipids accumulation in mucolipidosis IV cultured fibroblasts. J Inherit Metab Dis 11:144–150
Caimi L et al (1982) Mucolipidosis IV, a sialolipidosis due to ganglioside sialidase deficiency. J Inherit Metab Dis 5:218–224
Chen CS, Bach G, Pagano RE (1998) Abnormal transport along the lysosomal pathway in mucolipidosis, type IV disease. Proc Natl Acad Sci USA 95:6373–6378
Crandall BF et al (1982) Review article: mucolipidosis IV. Am J Med Genet 12:301–308
Bargal R, Bach G (1997) Mucolipidosis type IV: abnormal transport of lipids to lysosomes. J Inherit Metab Dis 20:625–632
Bach G, Chen CS, Pagano RE (1999) Elevated lysosomal pH in mucolipidosis type IV cells. Clin Chim Acta 280:173–179
Dong XP et al (2008) The type IV mucolipidosis-associated protein TRPML1 is an endolysosomal iron release channel. Nature 455: 992–996
Eichelsdoerfer JL et al (2010) Zinc dyshomeostasis is linked with the loss of mucolipidosis IV-associated TRPML1 ion channel. J Biol Chem 285:34304–34308
Kiselyov K et al (2011) TRPML: transporters of metals in lysosomes essential for cell survival? Cell Calcium 50:288–294
Soyombo AA et al (2006) TRP-ML1 regulates lysosomal pH and acidic lysosomal lipid hydrolytic activity. J Biol Chem 281: 7294–7301
Goldin E et al (1999) Mucolipidosis IV consists of one complementation group. Proc Natl Acad Sci USA 96:8562–8566
Cheng X et al (2010) Mucolipins: intracellular TRPML1-3 channels. FEBS Lett 584: 2013–2021
Kurz T et al (2008) Lysosomes in iron metabolism, ageing and apoptosis. Histochem Cell Biol 129:389–406
Kurz T, Eaton JW, Brunk UT (2011) The role of lysosomes in iron metabolism and recycling. Int J Biochem Cell Biol 43(12): 1686–1697
Curcio-Morelli C et al (2010) Macroautophagy is defective in mucolipin-1-deficient mouse neurons. Neurobiol Dis 40:370–377
Vergarajauregui S et al (2008) Autophagic dysfunction in mucolipidosis type IV patients. Hum Mol Genet 17:2723–2737
Venugopal B et al (2007) Neurologic, gastric, and opthalmologic pathologies in a murine model of mucolipidosis type IV. Am J Hum Genet 81:1070–1083
Chandra M et al (2011) A role for the Ca2+ channel TRPML1 in gastric acid secretion, based on analysis of knockout mice. Gastroenterology 140:857–867
Schiffmann R et al (1998) Constitutive achlorhydria in mucolipidosis type IV. Proc Natl Acad Sci USA 95:1207–1212
Micsenyi MC et al (2009) Neuropathology of the Mcoln1(-/-) knockout mouse model of mucolipidosis type IV. J Neuropathol Exp Neurol 68:125–135
Venkatachalam K et al (2008) Motor deficit in a Drosophila model of mucolipidosis type IV due to defective clearance of apoptotic cells. Cell 135:838–851
Schaheen L, Dang H, Fares H (2006) Basis of lethality in C. elegans lacking CUP-5, the mucolipidosis type IV orthologue. Dev Biol 293:382–391
Fares H, Greenwald I (2001) Regulation of endocytosis by CUP-5, the Caenorhabditis elegans mucolipin-1 homolog. Nat Genet 28:64–68
Treusch S et al (2004) Caenorhabditis elegans functional orthologue of human protein H-mucolipin-1 is required for lysosome biogenesis. Proc Natl Acad Sci USA 101: 4483–4488
Campbell EM, Fares H (2010) Roles of CUP-5, the Caenorhabditis elegans orthologue of human TRPML1, in lysosome and gut granule biogenesis. BMC Cell Biol 11:40
Sun T et al (2011) CUP-5, the C. elegans ortholog of the mammalian lysosomal channel protein MLN1/TRPML1, is required for proteolytic degradation in autolysosomes. Autophagy 7:1308–1315
Pryor PR et al (2006) Mucolipin-1 is a lysosomal membrane protein required for intracellular lactosylceramide traffic. Traffic 7:1388–1398
Thompson EG et al (2007) Lysosomal trafficking functions of mucolipin-1 in murine macrophages. BMC Cell Biol 8:54
Chen JL, Ahluwalia JP, Stamnes M (2002) Selective effects of calcium chelators on anterograde and retrograde protein transport in the cell. J Biol Chem 277:35682–35687
Hay JC (2007) Calcium: a fundamental regulator of intracellular membrane fusion? EMBO Rep 8:236–240
Pryor PR et al (2000) The role of intraorganellar Ca(2+) in late endosome-lysosome heterotypic fusion and in the reformation of lysosomes from hybrid organelles. J Cell Biol 149:1053–1062
Luzio JP, Bright NA, Pryor PR (2007) The role of calcium and other ions in sorting and delivery in the late endocytic pathway. Biochem Soc Trans 35:1088–1091
Luzio JP, Pryor PR, Bright NA (2007) Lysosomes: fusion and function. Nat Rev Mol Cell Biol 8:622–632
Dong XP et al (2010) PI(3,5)P(2) controls membrane trafficking by direct activation of mucolipin Ca(2+) release channels in the endolysosome. Nat Commun 1:38
LaPlante JM et al (2002) Identification and characterization of the single channel function of human mucolipin-1 implicated in mucolipidosis type IV, a disorder affecting the lysosomal pathway. FEBS Lett 532:183–187
LaPlante JM et al (2004) Functional links between mucolipin-1 and Ca2+ -dependent membrane trafficking in mucolipidosis IV. Biochem Biophys Res Commun 322: 1384–1391
Zhang F et al (2009) TRP-ML1 functions as a lysosomal NAADP-sensitive Ca2+ release channel in coronary arterial myocytes. J Cell Mol Med 13:3174–3185
Andrews NW (2000) Regulated secretion of conventional lysosomes. Trends Cell Biol 10: 316–321
Rodriguez A et al (1997) Lysosomes behave as Ca2+ -regulated exocytic vesicles in fibroblasts and epithelial cells. J Cell Biol 137:93–104
Rodriguez A et al (1999) CAMP regulates Ca2+ -dependent exocytosis of lysosomes and lysosome-mediated cell invasion by trypanosomes. J Biol Chem 274:16754–16759
LaPlante JM et al (2006) Lysosomal exocytosis is impaired in mucolipidosis type IV. Mol Genet Metab 89:339–348
Dong XP et al (2009) Activating mutations of the TRPML1 channel revealed by proline-scanning mutagenesis. J Biol Chem 284:32040–32052
Sardiello M et al (2009) A gene network regulating lysosomal biogenesis and function. Science 325:473–477
Medina DL et al (2011) Transcriptional activation of lysosomal exocytosis promotes cellular clearance. Dev Cell 21:421–430
Puertollano R, Kiselyov K (2009) TRPMLs: in sickness and in health. Am J Physiol Renal Physiol 296:F1245–F1254
Miedel MT et al (2008) Membrane traffic and turnover in TRP-ML1-deficient cells: a revised model for mucolipidosis type IV pathogenesis. J Exp Med 205:1477–1490
Kiselyov K, Muallem S (2008) Mitochondrial Ca2+ homeostasis in lysosomal storage diseases. Cell Calcium 44:103–111
Manzoni M et al (2004) Overexpression of wild-type and mutant mucolipin proteins in mammalian cells: effects on the late endocytic compartment organization. FEBS Lett 567: 219–224
Miedel MT et al (2006) Posttranslational cleavage and adaptor protein complex-dependent trafficking of mucolipin-1. J Biol Chem 281:12751–12759
Vergarajauregui S, Puertollano R (2006) Two di-leucine motifs regulate trafficking of mucolipin-1 to lysosomes. Traffic 7:337–353
Kim HJ et al (2009) The Ca(2+) channel TRPML3 regulates membrane trafficking and autophagy. Traffic 10:1157–1167
Cantiello HF et al (2005) Cation channel activity of mucolipin-1: the effect of calcium. Pflugers Arch 451:304–312
Raychowdhury MK et al (2004) Molecular pathophysiology of mucolipidosis type IV: pH dysregulation of the mucolipin-1 cation channel. Hum Mol Genet 13:617–627
Katz B, Minke B (2009) Drosophila photoreceptors and signaling mechanisms. Front Cell Neurosci 3:2
Zeevi DA et al (2010) Heteromultimeric TRPML channel assemblies play a crucial role in the regulation of cell viability models and starvation-induced autophagy. J Cell Sci 123: 3112–3124
Zhang F, Li PL (2007) Reconstitution and characterization of a nicotinic acid adenine dinucleotide phosphate (NAADP)-sensitive Ca2+ release channel from liver lysosomes of rats. J Biol Chem 282:25259–25269
Zhang F et al (2011) Reconstitution of lysosomal NAADP-TRP-ML1 signaling pathway and its function in TRP-ML1(-/-) cells. Am J Physiol Cell Physiol 301:C421–C430
Calcraft PJ et al (2009) NAADP mobilizes calcium from acidic organelles through two-pore channels. Nature 459:596–600
Yamaguchi S et al (2011) Transient receptor potential mucolipin 1 (TRPML1) and two-pore channels are functionally independent organellar ion channels. J Biol Chem 286:22934–22942
Grimm C et al (2010) Small molecule activators of TRPML3. Chem Biol 17:135–148
Cerny J et al (2004) The small chemical vacuolin-1 inhibits Ca(2+)-dependent lysosomal exocytosis but not cell resealing. EMBO Rep 5:883–888
Shen D, Wang X, Xu H (2011) Pairing phosphoinositides with calcium ions in endolysosomal dynamics: phosphoinositides control the direction and specificity of membrane trafficking by regulating the activity of calcium channels in the endolysosomes. Bioessays 33:448–457
Venugopal B et al (2009) Chaperone-mediated autophagy is defective in mucolipidosis type IV. J Cell Physiol 219:344–353
LaPlante JM et al (2011) The cation channel mucolipin-1 is a bifunctional protein that facilitates membrane remodeling via its serine lipase domain. Exp Cell Res 317:691–705
Vergarajauregui S, Martina JA, Puertollano R (2011) LAPTMs regulate lysosomal function and interact with mucolipin 1: new clues for understanding mucolipidosis type IV. J Cell Sci 124:459–468
Cabrita MA et al (1999) Mouse transporter protein, a membrane protein that regulates cellular multidrug resistance, is localized to lysosomes. Cancer Res 59:4890–4897
Pak Y et al (2006) Transport of LAPTM5 to lysosomes requires association with the ubiquitin ligase Nedd4, but not LAPTM5 ubiquitination. J Cell Biol 175:631–645
Vergarajauregui S, Martina JA, Puertollano R (2009) Identification of the penta-EF-hand protein ALG-2 As a Ca2+ -dependent interactor of mucolipin-1. J Biol Chem 284:36357–36366
Abe K, Puertollano R (2011) Role of TRP channels in the regulation of the endosomal pathway. Physiology (Bethesda) 26:14–22
Brailoiu E et al (2009) Essential requirement for two-pore channel 1 in NAADP-mediated calcium signaling. J Cell Biol 186:201–209
Venkatachalam K, Hofmann T, Montell C (2006) Lysosomal localization of TRPML3 depends on TRPML2 and the mucolipidosis-associated protein TRPML1. J Biol Chem 281:17517–17527
Curcio-Morelli C et al (2010) Functional multimerization of mucolipin channel proteins. J Cell Physiol 222:328–335
Karacsonyi C, Miguel AS, Puertollano R (2007) Mucolipin-2 localizes to the Arf6-associated pathway and regulates recycling of GPI-APs. Traffic 8:1404–1414
Lev S et al (2010) Constitutive activity of the human TRPML2 channel induces cell degeneration. J Biol Chem 285:2771–2782
Samie MA et al (2009) The tissue-specific expression of TRPML2 (MCOLN-2) gene is influenced by the presence of TRPML1. Pflugers Arch 459:79–91
Caplan S et al (2002) A tubular EHD1-containing compartment involved in the recycling of major histocompatibility complex class I molecules to the plasma membrane. EMBO J 21:2557–2567
Martina JA, Lelouvier B, Puertollano R (2009) The calcium channel mucolipin-3 is a novel regulator of trafficking along the endosomal pathway. Traffic 10:1143–1156
Lelouvier B, Puertollano R (2011) Mucolipin-3 regulates luminal calcium, acidification, and membrane fusion in the endosomal pathway. J Biol Chem 286:9826–9832
Atiba-Davies M, Noben-Trauth K (2007) TRPML3 and hearing loss in the varitint-waddler mouse. Biochim Biophys Acta 1772:1028–1031
Ho CY, Alghamdi TA, Botelho RJ (2011) Phosphatidylinositol-3,5-bisphosphate: no longer the poor PIP(2). Traffic 13(1):1–8
Folkerth RD et al (1995) Mucolipidosis IV: morphology and histochemistry of an autopsy case. J Neuropathol Exp Neurol 54:154–164
Silva GA (2006) Neuroscience nanotechnology: progress, opportunities and challenges. Nat Rev Neurosci 7:65–74
Silva GA (2007) Nanotechnology approaches for drug and small molecule delivery across the blood brain barrier. Surg Neurol 67:113–116
Silva GA (2010) Nanotechnology applications and approaches for neuroregeneration and drug delivery to the central nervous system. Ann N Y Acad Sci 1199:221–230
Poole B, Ohkuma S (1981) Effect of weak bases on the intralysosomal pH in mouse peritoneal macrophages. J Cell Biol 90:665–669
Reijngoud DJ, Oud PS, Tager JM (1976) Effect of ionophores on intralysosomal pH. Biochim Biophys Acta 448:303–313
Kogot-Levin A et al (2009) Mucolipidosis type IV: the effect of increased lysosomal pH on the abnormal lysosomal storage. Pediatr Res 65:686–690
Piper RC, Luzio JP (2004) CUPpling calcium to lysosomal biogenesis. Trends Cell Biol 14:471–473
Krogsgaard-Larsen P, StrÃmgaard K, Madsen U (2010) Textbook of drug design and discovery, 4th edn. CRC, Boca Raton, FL
Lee SJ, Cho KS, Koh JY (2009) Oxidative injury triggers autophagy in astrocytes: the role of endogenous zinc. Glia 57:1351–1361
Sands MS, Davidson BL (2006) Gene therapy for lysosomal storage diseases. Mol Ther 13:839–849
Sun B et al (2005) Correction of glycogen storage disease type II by an adeno-associated virus vector containing a muscle-specific promoter. Mol Ther 11:889–898
Dehay B et al (2010) Pathogenic lysosomal depletion in parkinson’s disease. J Neurosci 30:12535–12544
Nicot AS, Laporte J (2008) Endosomal phosphoinositides and human diseases. Traffic 9:1240–1249
Chow CY et al (2007) Mutation of FIG4 causes neurodegeneration in the pale tremor mouse and patients with CMT4J. Nature 448:68–72
Lenk GM et al (2011) Pathogenic mechanism of the FIG4 mutation responsible for Charcot-Marie-Tooth disease CMT4J. PLoS Genet 7:1002104
Pasinelli P, Brown RH (2006) Molecular biology of amyotrophic lateral sclerosis: insights from genetics. Nat Rev Neurosci 7:710–723
Chow CY et al (2009) Deleterious variants of FIG4, a phosphoinositide phosphatase, in patients with ALS. Am J Hum Genet 84:85–88
Sbrissa D et al (2007) Core protein machinery for mammalian phosphatidylinositol 3,5-bisphosphate synthesis and turnover that regulates the progression of endosomal transport. Novel Sac phosphatase joins the ArPIKfyve-PIKfyve complex. J Biol Chem 282:23878–23891
Duex JE et al (2006) Phosphoinositide 5-phosphatase Fig 4p is required for both acute rise and subsequent fall in stress-induced phosphatidylinositol 3,5-bisphosphate levels. Eukaryot Cell 5:723–731
Duex JE, Tang F, Weisman LS (2006) The Vac14p-Fig4p complex acts independently of Vac7p and couples PI3,5P2 synthesis and turnover. J Cell Biol 172:693–704
Ikonomov OC et al (2010) ArPIKfyve regulates Sac3 protein abundance and turnover: disruption of the mechanism by Sac3I41T mutation causing Charcot-Marie-Tooth 4J disorder. J Biol Chem 285: 26760–26764
Li S et al (2005) Mutations in PIP5K3 are associated with Francois-Neetens mouchetee fleck corneal dystrophy. Am J Hum Genet 77:54–63
Acknowledgements
The author is grateful to Dr. Shaya Lev and Maximilian Peters for careful reading of the manuscript. This review was made possible by the generous support of Rabbi David and Mrs. Anita Fuld.
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Zeevi, D.A. (2012). TRPML Channels in Function, Disease, and Prospective Therapies. In: Szallasi, A., Bíró, T. (eds) TRP Channels in Drug Discovery. Methods in Pharmacology and Toxicology. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-62703-077-9_9
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