title: [Analysis of telomere restriction fragments in human astrocytomas and glioblastomas].
abstract: OBJECTIVE
  To analyse the length of telomere restriction fragments (TRF) in different type of human astrocytomas as well as normal brain tissues and to evaluate the correlation of telomere status and tumor progression.
  
  
  METHODS
  DNAs extracted from normal and tumor samples were studied with Southern blot analysis, using (TTAGGG)4 probe specific for human telomeric sequences.
  
  
  RESULTS
  The lower portion of TRFs of astrocytoma type I, II and III was shortened gradually in comparison with that of normal brain tissues: both uper and lower portions of TRFs in 12 cases of glioblastoma multiformes studied were lost distinctively. However, no obvious length difference of TRFs could be detected between primary and recurrent glioblastomas.
  
  
  CONCLUSIONS
  Telomere reduction is one of the important genetic events during transformation of astrocytomas. Telomere repair mechanism may be initiated in glioblastoma cells which may, therefore, maintain a relative stabitity of TRFs and permit a constitutive proliferation of those malignant cells.
authors.affiliation: Division of Molecular Biology, Shenyang Medical College.
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.forename: H
authors.initials: H
authors.lastname: Li
authors.forename: Y
authors.initials: Y
authors.lastname: Luo
mesh_terms: D001254:Astrocytoma / Q000235:genetics*; D015139:Blotting, Southern; D001932:Brain Neoplasms / Q000235:genetics*; D005909:Glioblastoma / Q000235:genetics*; D006801:Humans; D012150:Polymorphism, Restriction Fragment Length; D016615:Telomere / Q000235:genetics*