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Cylindroma overexpresses collagen VII, the major anchoring fibril protein

L Bruckner-Tuderman1, M Pfaltz, U W Schnyder

  • 1Department of Dermatology, University Hospital Zürich, Switzerland.

The Journal of Investigative Dermatology
|May 1, 1991
PubMed

Insights

Human cylindroma tumors provide an abundant source of collagen VII, a key protein in anchoring fibrils. These findings offer a new in vitro model for studying collagen VII and anchoring fibril formation.

Area of Science:

  • Dermatology
  • Biochemistry
  • Cell Biology

Background:

  • Human adnexal tumors called cylindromas exhibit a unique, thick basement membrane-like zone surrounding cell clusters.
  • This zone contains numerous anchoring fibrils, which are crucial for dermal-epidermal adhesion.

Purpose of the Study:

  • To investigate the composition of the basement membrane-like zone in cylindromas.
  • To evaluate the potential of cylindroma cells as a source for studying collagen VII and anchoring fibril formation.

Main Methods:

  • Ultrastructural analysis of the tumor's basement membrane-like zone.
  • Indirect immunofluorescence staining using antibodies against collagen VII.
  • Isolation of collagen VII from tumor tissue via pepsin digestion or chaotropic agent extraction.
  • Culture and passaging of cylindroma cells, followed by immunofluorescence and immunoblotting assays for collagen VII expression.

Main Results:

  • Ultrastructural analysis revealed recesses containing anchoring fibrils within the electron-dense zone.
  • Immunofluorescence staining confirmed strong collagen VII presence in this zone.
  • Collagen VII was successfully isolated from tumor tissue.
  • Cultured cylindroma cells demonstrated robust collagen VII expression in vitro.

Conclusions:

  • Cylindroma tumors are a rich source of collagen VII.
  • Cultured cylindroma cells provide a valuable in vitro model for studying collagen VII biosynthesis, regulation, and anchoring fibril formation.
  • This model overcomes limitations of other systems that fail to produce sufficient anchoring fibril proteins.

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