Occurrence of differentiated keratin peptide(K1) in cultured human squamous cell carcinomas

Biochem Biophys Res Commun. 1992 Feb 14;182(3):1440-5. doi: 10.1016/0006-291x(92)91895-w.


To date, the largest keratin peptide(K1, 68 KD) has been absent in cultured human squamous cell carcinomas. Using a low salt aqueous solution, not containing high salt and Triton X-100, as a washing buffer for keratin extraction, followed by two dimensional polyacrylamide gel electrophoresis, immunological techniques and Northern blot analysis, we demonstrated K1 peptide in two kinds of cultured human squamous cell carcinomas. Until now keratin extraction has been done using high salt/Triton X-100 solution during which K1 peptide may be removed together developed an affinity with the buffer. Many investigators may have therefore overlooked K1.

MeSH terms

  • Amino Acid Sequence
  • Base Sequence
  • Blotting, Northern
  • Carcinoma, Squamous Cell
  • Cell Differentiation
  • Cell Line
  • Electrophoresis, Gel, Two-Dimensional
  • Electrophoresis, Polyacrylamide Gel
  • Humans
  • Keratins / genetics
  • Keratins / isolation & purification
  • Keratins / metabolism*
  • Molecular Sequence Data
  • Molecular Weight
  • Oligodeoxyribonucleotides
  • RNA, Messenger / genetics
  • RNA, Messenger / isolation & purification
  • RNA, Neoplasm / genetics
  • RNA, Neoplasm / isolation & purification
  • Tumor Cells, Cultured


  • Oligodeoxyribonucleotides
  • RNA, Messenger
  • RNA, Neoplasm
  • Keratins