title: Lynx1 supports neuronal health in the mouse dorsal striatum during aging: an ultrastructural investigation.
abstract: Nicotinic acetylcholine receptors have been shown to participate in neuroprotection in the aging brain. Lynx protein modulators dampen the activity of the cholinergic system through direct interaction with nicotinic receptors. Although lynx1 null mutant mice exhibit augmented learning and plasticity, they also exhibit macroscopic vacuolation in the dorsal striatum as they age, detectable at the optical microscope level. Despite the relevance of the lynx1 gene to brain function, little is known about the cellular ultrastructure of these age-related changes. In this study, we assessed degeneration in the dorsal striatum in 1-, 3-, 7-, and 13-month-old mice, using optical and transmission electron microscopy. We observed a loss of nerve fibers, a breakdown in nerve fiber bundles, and a loss of neuronal nuclei in the 13-month-old lynx1 null striatum. At higher magnification, these nerve fibers displayed intracellular vacuoles and disordered myelin sheaths. Few or none of these morphological alterations were present in younger lynx1 null mutant mice or in heterozygous lynx1 null mutant mice at any age. These data indicate that neuronal health can be maintained by titrating lynx1 dosage and that the lynx1 gene may participate in a trade-off between neuroprotection and augmented learning.
authors.affiliation: Biology Division, California Institute of Technology, MC156-29, 1200 E. California Blvd., Pasadena, CA, 91125, USA.
authors.forename: Atsuko
authors.initials: A
authors.lastname: Kobayashi
authors.forename: Rell L
authors.initials: RL
authors.lastname: Parker
authors.forename: Ashley P
authors.initials: AP
authors.lastname: Wright
authors.forename: Hajer
authors.initials: H
authors.lastname: Brahem
authors.forename: Pauline
authors.initials: P
authors.lastname: Ku
authors.forename: Katherine M
authors.initials: KM
authors.lastname: Oliver
authors.forename: Andreas
authors.initials: A
authors.lastname: Walz
authors.forename: Henry A
authors.initials: HA
authors.lastname: Lester
authors.forename: Julie M
authors.initials: JM
authors.lastname: Miwa
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000375:Aging / Q000378:metabolism*; D000818:Animals; D003342:Corpus Striatum / Q000166:cytology / Q000254:growth & development / Q000378:metabolism*; D008562:Membrane Glycoproteins / Q000235:genetics* / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D009186:Myelin Sheath / Q000378:metabolism; D009474:Neurons / Q000378:metabolism / Q000648:ultrastructure*; D009479:Neuropeptides / Q000235:genetics* / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; C120222:Lynx1 protein, mouse; D008562:Membrane Glycoproteins; D009479:Neuropeptides