Specific antibodies to bovine choline acetyltransferase raised in mice immunised with small amounts of partially purified enzyme.
Choline acetyltransferase was purified approximately 18,000-fold from 300 g of bovine caudate nuclei to a specific activity of 21 ?mol min mg protein. The overall procedure used was: extraction of the enzyme by high salt concentration, chromatography on carboxy-methyl-Sephadex, precipitation by ammonium sulphate, affinity chromatography on Blue-Sepharose and, finally absorption on hydroxylapatite. When the enzyme absorbed on hydroxylapatite was injected into mice, it provoked reproducibly a transient production of 'inhibitory' antibodies, followed by higher antibody titres mainly of 'non-inhibitory' type. These responses were elicited by injecting less than a total of 20 ?g of immunogen. The highest antibody titre was obtained less than 2 months following the initial immunisation. Species cross reactivity was investigated. This procedure should prove to be of value in the production of monoclonal antibodies to choline acetyltransferase.
Eder-Colli
L
L
Departments of Pharmacology and Human Anatomy, South Parks Road, Oxford, U.K.
Powell
J F
JF
Claudio Cuello
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A
David Smith
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A