Spatiotemporal analysis of purkinje cell degeneration relative to parasagittal expression domains in a model of neonatal viral infection

J Virol. 2007 Mar;81(6):2675-87. doi: 10.1128/JVI.02245-06. Epub 2006 Dec 20.

Abstract

Infection of newborn Lewis rats with Borna disease virus (neonatal Borna disease [NBD]) results in cerebellar damage without the cellular inflammation associated with infections in later life. Purkinje cell (PC) damage has been reported for several models of early-life viral infection, including NBD; however, the time course and distribution of PC pathology have not been investigated rigorously. This study examined the spatiotemporal relationship between PC death and zonal organization in NBD cerebella. Real-time PCR at postnatal day 28 (PND28) revealed decreased cerebellar levels of mRNAs encoding the glycolytic enzymes aldolase C (AldoC, also known as zebrin II) and phosphofructokinase C and the excitatory amino acid transporter 4 (EAAT4). Zebrin II and EAAT4 immunofluorescence analysis in PND21, PND28, PND42, and PND84 NBD rat cerebella revealed a complex pattern of PC degeneration. Early cell loss (PND28) was characterized by preferential apoptotic loss of zebrin II/EAAT4-negative PC subsets in the anterior vermis. Consistent with early preferential loss of zebrin II/EAAT4-negative PCs in the vermis, the densities of microglia and the Bergmann glial expression of metallothionein I/II and the hyaluronan receptor CD44 were higher in zebrin II/EAAT4-negative zones. In contrast, early loss in lateral cerebellar lobules did not reflect a similar discrimination between PC phenotypes. Patterns of vermal PC loss became more heterogeneous at PND42, with the loss of both zebrin II/EAAT4-negative and zebrin II/EAAT4-positive neurons. At PND84, zebrin II/EAAT4 patterning was abolished in the anterior cerebellum, with preferential PC survival in lobule X. Our investigation reveals regional discrimination between patterns of PC subset loss, defined by zebrin II/EAAT4 expression domains, following neonatal viral infection. These findings suggest a differential vulnerability of PC subsets during the early stages of virus-induced neurodegeneration.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Animals, Newborn
  • Borna Disease / metabolism*
  • Borna Disease / pathology
  • Borna disease virus*
  • Calbindins
  • Cell Death
  • Cerebellum / physiopathology
  • Excitatory Amino Acid Transporter 4 / analysis
  • Excitatory Amino Acid Transporter 4 / metabolism
  • Fluorescent Antibody Technique, Indirect
  • Kinetics
  • Models, Neurological
  • Nerve Tissue Proteins / analysis
  • Nerve Tissue Proteins / metabolism
  • Oligonucleotide Array Sequence Analysis
  • Phosphofructokinase-1, Type C / analysis
  • Phosphofructokinase-1, Type C / metabolism
  • Polymerase Chain Reaction
  • Purkinje Cells / physiology*
  • RNA, Messenger / analysis
  • Rats
  • Rats, Inbred Lew
  • S100 Calcium Binding Protein G / metabolism

Substances

  • Calbindins
  • Excitatory Amino Acid Transporter 4
  • Nerve Tissue Proteins
  • RNA, Messenger
  • S100 Calcium Binding Protein G
  • Slc1a6 protein, rat
  • zebrin II
  • Phosphofructokinase-1, Type C