Novel Monoclonal Antibodies Demonstrate Biochemical Variation of Brain Parkin with Age

Aaron C. Pawlyk, Benoit I. Giasson, Deepak M. Sampathu, Francisco A. Perez, Kah Leong Lim, Valina L. Dawson, Ted M. Dawson, Richard D. Palmiter, John Q. Trojanowski, Virginia M.Y. Lee

Research output: Contribution to journalArticle

Abstract

Autosomal recessive juvenile parkinsonism is a movement disorder associated with the degeneration of dopaminergic neurons in substantia nigra pars compacta. The loss of functional parkin caused by parkin gene mutations is the most common single cause of juvenile parkinsonism. Parkin has been shown to aid in protecting cells from endoplasmic reticulum and oxidative stressors presumably due to ubiquitin ligase activity of parkin that targets proteins for proteasomal degradation. However, studies on parkin have been impeded because of limited reagents specific for this protein. Here we report the generation and characterization of a panel of parkin-specific monoclonal antibodies. Biochemical analyses indicate that parkin is present only in the high salt-extractable fraction of mouse brain, whereas it is present in both the high salt-extractable and RIPA-resistant, SDS-extractable fraction in young human brain. Parkin is present at decreased levels in the high salt-extractable fraction and at increased levels in the SDS-extractable fraction from aged human brain. This shift in the extractability of parkin upon aging is seen in humans but not in mice, demonstrating species-specific differences in the biochemical characteristics of murine versus human parkin. Finally, by using these highly specific anti-parkin monoclonal antibodies, it was not possible to detect parkin in α-synuclein-containing lesions in α -synucleinopathies thereby challenging prior inferences about the role of parkin in movement disorders other than autosomal recessive juvenile parkinsonism.

Original languageEnglish (US)
Pages (from-to)48120-48128
Number of pages9
JournalJournal of Biological Chemistry
Volume278
Issue number48
DOIs
StatePublished - Nov 28 2003

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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    Pawlyk, A. C., Giasson, B. I., Sampathu, D. M., Perez, F. A., Lim, K. L., Dawson, V. L., Dawson, T. M., Palmiter, R. D., Trojanowski, J. Q., & Lee, V. M. Y. (2003). Novel Monoclonal Antibodies Demonstrate Biochemical Variation of Brain Parkin with Age. Journal of Biological Chemistry, 278(48), 48120-48128. https://doi.org/10.1074/jbc.M306889200