A rat model of human FENIB (familial encephalopathy with neuroserpin inclusion bodies)

Katsura Takano, Yasuko Kitao, Reiko Inagi, Takashi Momoi, Tomohiro Matsuyama, Toshio Miyata, Yukio Yoneda, Hiroyuki Iso, David M. Stern, Osamu Hori, Satoshi Ogawa

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


FENIB (familial encephalopathy with neuroserpin inclusion bodies) is caused by intracellular accumulation/polymerization of mutant neuroserpins in the endoplasmic reticulum (ER). Transgenic rats overexpressing megsin (Tg meg), a newly identified serine protease inhibitor (serpin), demonstrated intraneuronal periodic-acid Schiff (PAS)-positive inclusions distributed throughout deeper layers of cerebral cortex, CA1 of the hippocampus, and substantia nigra. Hippocampal extracts from Tg meg rats showed increased expression of ER stress proteins, and activation of caspases-12 and -3, associated with decreased neuronal density. Enhanced ER stress was also observed in dopaminergic neurons in the substantia nigra, in parallel with decreased neuronal viability and motor coordination. In each case, PAS-positive inclusions were also positive for megsin. These data suggest that overexpression of megsin results in ER stress, eventuating in the formation of PAS-positive inclusions. Tg meg rats provide a novel model of FENIB, where accumulation of serpins in the ER induces selective dysfunction/loss of specific neuronal populations.

Original languageEnglish
Pages (from-to)1040-1047
Number of pages8
JournalBiochemical and biophysical research communications
Issue number3
Publication statusPublished - 2006 Aug 4
Externally publishedYes


  • Neuronal cell death
  • Neuroserpin
  • Oxidant stress
  • Oxygen/glucose regulated protein (ORP/GRP)
  • Protein malfolding

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


Dive into the research topics of 'A rat model of human FENIB (familial encephalopathy with neuroserpin inclusion bodies)'. Together they form a unique fingerprint.

Cite this