ernest at hiv.med.umn.edu (Ernest Retzel (1535 49118)) writes:
>A user here is wondering if someone [anyone?] knows of a program called
>Ligand, used, apparently, for determining the number of receptors on
>the surface of a cell?
As I understand it the history of ligand is: An algorithm
proposed by Feldman (1972) is at the heart of several programs,
e.g. Munson & Rodbard (1972), De Lean (1979), McPherson (1985),
which allow binding models to be applied to both simple and complex
experiments involving the interaction of one or more ligands at
one or more binding sites.
The ligand algorithm can estimate the binding parameters which
includes Bmax - the concentration of binding sites in the sample. If you
know the number of ligand binding sites per receptor (or are happy to
assume there is only one) then you can derive the number of receptors
from Bmax.
I have developed a version of LIGAND that is part of a general
non-linear extended least squares modelling system for PCs. The program
is MKMODEL. MKMODEL is distributed by BIOSOFT:
49 Bateman Street, Cambridge, CB2 1LR, UK - FAX +44 (223) 312873
or - TEL +44 (223) 68622
PO Box 10398, Ferguson, MO 63135-9913, USA - FAX +1 (314) 524-8129
Please contact them for prices. - TEL +1 (314) 524-8029
REFERENCES
De Lean A, Hancock AA, Lefkowitz RJ. Validation and statistical
analysis of a computer modeling method for quantitative analysis
of radioligand binding data for mixtures of pharmacological
receptor subtypes. Molec.Pharmacol. (1982) 21:5-16
Feldman HA. Mathematical theory of complex ligand-binding systems
at equilibrium. Analyt.Biochem. (1972) 48:317-338
McPherson GA. Analysis of radioligand binding experiments.
J.Pharmacol.Methods (1985) 14:213-228
Munson PJ. LIGAND. BCTIC Computer Code Collection. Vanderbilt
Medical Center, Nashville,TN, USA. (1981)
Munson PJ, Rodbard D. LIGAND: A versatile computerized approach
for characterization of ligand-binding systems. Analyt.Biochem.
(1980) 107:220-239
--
Nick Holford, Dept Pharmacology & Clinical Pharmacology
University of Auckland, Auckland, New Zealand
INTERNET: n.holford at aukuni.ac.nz
