Characteristics of alpha-adrenoceptors in two human colorectal cancer cell lines

Devendra K. Agrawal, David M. Wildrick, Bruce M. Boman

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The DiFi and HT-29 human colorectal cancer cell lines were characterized and compared with respect to binding properties of alpha adrenoceptors present on the cell surface. Both cell lines possessed alpha-1 and alpha-2 adrenoceptors of high affinity; however, DiFi cells were rich in alpha-1 adrenoceptors, whereas HT-29 cells were rich in alpha-2 adrenoceptors. In each cell line, specificity of radioligand binding to alpha-1 or alpha-2 adrenoceptors was proved via competition studies using non-tritiated drugs. We believe this to be the first characterization of alpha-1 adrenoceptors in cell line HT-29 and of alpha-1 and alpha-2 adrenoceptors in DiFi cells. Differences between these cell lines in alpha adrenoceptor expression are discussed in relation to colon carcinogenesis. The high level of alpha-1 adrenoceptors seen in DiFi cells should make this cell line useful in studies of the function and regulation of this adrenoceptor subtype.

Original languageEnglish
Pages (from-to)176-184
Number of pages9
JournalBiochemical and Biophysical Research Communications
Issue number1
StatePublished - May 29 1992

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Biophysics
  • Molecular Biology


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