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Comparison of lipolytic and melanotropic factors in bovine choroid plexus and in bovine pineal gland.

Aqueous extracts of bovine pineal gland stimulate lipolysis in adipose tissue of the rabbit but not of the cat, and darken the skin of the frog. Extracts of bovine choroid plexus stimulate lipolysis in adipose tissue of both rabbit and cat, and also darken the frog's skin. Both pineal glands and choroid plexus were fractionated by the following scheme: extraction with acetic acid ->fractional precipitation of the acid extract with acetone and ether -> chromatography on carboxymethylcellulose (CM-32). In both pineal and choroid plexus experiments, the rabbit lipolytic and melanotropic activities emerged from CM-32 together in two zones: an earlier zone (fraction 8) eluted at pH 4.9–5.1, which contained about 40% of the rabbit lipolytic and melanotropic activities applied to the column, and a later zone eluted at pH 6.5–7.0, containing about 5% of the activities. In the effluent from the choroid plexus (but not from the pineal) CM-32 column, a third region of biological activity was eluted at pH 6.0–6.5, wh...