title: Reduced beta-casein levels in milk samples from patients with postpartum psychosis.
abstract: Defatted breast milk from women with postpartum psychosis and from healthy lactating women was analyzed by high-resolution gel permeation chromatography as well as by sodium dodecyl sulfate (SDS) and urea polyacrylamide gel electrophoresis. The gel permeation procedure allowed quantitative analysis of milk proteins (including beta-casein) with minute amounts of defatted milk (10-15 microliter). By electrophoresis, further characterization of the protein pattern, including the beta-casein fraction, was obtained. Milk samples from five control and seven psychotic subjects were analyzed. The concentration of the beta-casein-containing peak was significantly lower in milk samples from the psychotic group by both chromatography and electrophoresis. These lower levels of beta-casein may result from a higher rate of enzymatic degradation generating i.a. peptides with opioid activity, as shown earlier in plasma and CSF of women with postpartum psychosis.
authors.affiliation: Department of Pharmacology, University of Uppsala, Sweden.
authors.forename: F
authors.initials: F
authors.lastname: Nyberg
authors.forename: L H
authors.initials: LH
authors.lastname: Lindström
authors.forename: L
authors.initials: L
authors.lastname: Terenius
mesh_terms: D000328:Adult; D000818:Animals; D002364:Caseins / Q000032:analysis*; D005260:Female; D006801:Humans; D008892:Milk / Q000032:analysis*; D011247:Pregnancy; D011618:Psychotic Disorders / Q000378:metabolism*; D011644:Puerperal Disorders / Q000378:metabolism*
chemical_list: D002364:Caseins