Surface membrane glycopeptides which coincide with virus transformation and tumorigenesis

Area of Science:

• Cell Biology
• Virology
• Cancer Research

Background:

• Polyoma virus infection can induce cell transformation and tumor formation.
• Surface glycopeptides are key components of cell membranes and can be altered during cellular changes.

Purpose of the Study:

• To investigate the relationship between surface glycopeptides and polyoma virus-induced cell transformation and tumorigenesis in hamster embryo cells.
• To characterize glycopeptide changes associated with different transformation rates and tumorigenic potentials.

Main Methods:

• Isolation and analysis of surface glycopeptides from transformed hamster embryo cell clones.
• Enzymatic removal (trypsin, Pronase) and size fractionation (Sephadex G-50) of glycopeptides.
• Correlation of glycopeptide profiles with phenotypic transformation and tumor formation in vivo.

Main Results:

• A specific group of surface glycopeptides became increasingly evident during delayed transformation over 85 days.
• Rapidly transformed cells showed varying levels of these glycopeptides, with one less tumorigenic clone exhibiting fewer.
• The abundance of specific glycopeptides was directly proportional to the cells' tumor-forming ability.
• Tumor-derived cells consistently showed an abundance of these glycopeptides.

Conclusions:

• Specific surface membrane glycopeptides are associated with viral transformation.
• These glycopeptides appear to correlate with and potentially play a role in tumorigenesis induced by polyoma virus.