Autonomous requirements of the Menkes disease protein in the nervous system

Victoria L. Hodgkinson, Sha Zhu, Yanfang Wang, Erik Ladomersky, Karen Nickelson, Gary A. Weisman, Jaekwon Lee, Jonathan D. Gitlin, Michael J. Petris

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Menkes disease is a fatal neurodegenerative disorder arising from a systemic copper deficiency caused by loss-of-function mutations in a ubiquitously expressed copper transporter, ATP7A. Although this disorder reveals an essential role for copper in the developing human nervous system, the role of ATP7A in the pathogenesis of signs and symptoms in affected patients, including severe mental retardation, ataxia, and excitotoxic seizures, remains unknown. To directly examine the role of ATP7A within the central nervous system, we generated Atp7aNes mice, in which the Atp7a gene was specifically deleted within neural and glial cell precursors without impairing systemic copper homeostasis, and compared these mice with the mottled brindle (mo-br) mutant, a murine model of Menkes disease in which Atp7a is defective in all cells. Whereas mo-br mice displayed neurodegeneration, demyelination, and 100% mortality prior to weaning, the Atp7aNes mice showed none of these phenotypes, exhibiting only mild sensorimotor deficits, increased anxiety, and susceptibility to NMDA-induced seizure. Our results indicate that the pathophysiology of severe neurological signs and symptoms in Menkes disease is the result of copper deficiency within the central nervous system secondary to impaired systemic copper homeostasis and does not arise from an intrinsic lack of ATP7A within the developing brain. Furthermore, the sensorimotor deficits, hypophagia, anxiety, and sensitivity to NMDA-induced seizure in the Atp7aNes mice reveal unique autonomous requirements for ATP7A in the nervous system. Taken together, these data reveal essential roles for copper acquisition in the central nervous system in early development and suggest novel therapeutic approaches in affected patients.

Original languageEnglish (US)
Pages (from-to)660-668
Number of pages9
JournalAmerican Journal of Physiology - Cell Physiology
Volume309
Issue number10
DOIs
StatePublished - 2015

Keywords

  • Copper
  • Menkes disease
  • Nervous system
  • Nutrition
  • Transporter

ASJC Scopus subject areas

  • Physiology
  • Cell Biology

Fingerprint Dive into the research topics of 'Autonomous requirements of the Menkes disease protein in the nervous system'. Together they form a unique fingerprint.

  • Cite this

    Hodgkinson, V. L., Zhu, S., Wang, Y., Ladomersky, E., Nickelson, K., Weisman, G. A., Lee, J., Gitlin, J. D., & Petris, M. J. (2015). Autonomous requirements of the Menkes disease protein in the nervous system. American Journal of Physiology - Cell Physiology, 309(10), 660-668. https://doi.org/10.1152/ajpcell.00130.2015