Properties of benzodiazepine binding sites in peripheral blood lymphocytes

L. Garau, M. Memo, M. Pizzi, C. Missale, M. A M Carai, W. Boi, M. G. Ennas, P. E. Manconi, P. F. Spano

Research output: Contribution to journalArticlepeer-review


Benzodiazepine (BDZ) binding sites were studied by using 3H-diazepam and 3H-Ro 5-4864 in intact lymphocytes from peripheral blood (PBL), in comparison to kidney and cerebellum. Experiments with 3H-diazepam performed at equilibrium and measuring kinetics revealed that BDZ binding sites are indeed present in rat PBL. The binding is saturable (Bmax 557 fmoles/106 cells), with high affinity (KD = 9.3 nM) and reversible. Specific binding sites are also observed by saturation experiments with 3H-Ro 5-4864 (Bmax 175 fmoles/106 cells, KD 2.2 nM). In addition, analysis of saturation isotherms obtained with 3H-diazepam indicates that BDZ binding sites are also present in human PBL. Scatchard plot of binding isotherms revealed an apparent single population of sites in all cases. The pharmacological characterization of BDZ binding sites in PBL, as compared with those of kidney and cerebellum, showed that these sites belong to the so-called 'peripheral type.'

Original languageEnglish
Pages (from-to)332-336
Number of pages5
JournalJournal of Clinical Laboratory Analysis
Issue number6
Publication statusPublished - 1989

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)


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