Ultrastructural localization of aa-crystallin to the bovine Lens fiber cell cytoskeleton

Paul G FitzGerald, Dcbra Graham

Research output: Contribution to journalArticle

61 Scopus citations

Abstract

Monoclonal antibodies to the bovine aA-crystallin were developed and used to probe the relationship between aA-crystallin and the bovine lens fiber cell Plasma Membrane-Cytoskeleton Complex (PMCC). Superficial bovine lens cortex was washed by repeated homogenization/centrifugation to remove "soluble protein." The resulting Plasma Membrane-Cytoskeleton Complex was covalently immobilized to inert resin, and extensively buffer washed. SDS PAGE and immunoblot analysis of both the covalently immobilized PMCC and of the sequentially-generated subcellular fractions shows that most of the lens alpha crystallin is "soluble" and readily extracted with physiologic buffers. However, this data also shows that 1) Non-alpha crystallins are progressively and quantitatively extracted from the PMCC with buffer, 2) An irreducible level of non-covalently bound alpha crystallin is achieved which cannot be readily extracted from the PMCC, even with 2 M urea, 1% NP40 or 0.4M KC1. Electron microscope level immunocytochemistry was performed on both the covalently immobilized PMCC, as well as on buffer-extracted thick frozen sections, using monoclonal antibodies to the αA-crystallin. The results show a very heavy labelling of both intermediate filaments and beaded filaments, but little or no labelling of fiber cell membranes. The data presented argues that a subtraction of the total αA-crystallin is strongly associated with the fiber cell cytoskeleton complex, and constitutes a quantitatively major component of the lens cytoskeleton fraction.

Original languageEnglish (US)
Pages (from-to)417-436
Number of pages20
JournalCurrent Eye Research
Volume10
Issue number5
DOIs
StatePublished - 1991

    Fingerprint

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

Cite this