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The effect of monomeric (glycosylated and unglycosylated) and dimeric form of porcine prolactin on change of the blood levels of triglycerides (TG) and cholesterol in lipoproteins (LP) of different density and the activity of the main enzymes of plasmatic and liver lipid metabolism were studied under the conditions of experimental hyperprolactinemia in rabbits. It was shown to be accompanied by dyslipoproteinemia, characterized by a stable rise of TG in LP of very low, high and low density as well as by a rise of cholesterol concentration in VLDL and its decrease in HDL. Such changes in LP showed correlation with lowered activity of lipoprotein lipase, triglyceride lipase of the liver and plasmatic postheparin lipolytic activity. Analysis of prolactin-induced dyslipoproteinemia has shown that changes in plasma lipoproteins are of atherogenic nature.

A total of 121 inpatients with insulin and noninsulin dependent diabetes mellitus were investigated. The patients with noninsulin dependent diabetes mellitus were divided into 2 groups with relation to the presence or absence of secondary resistance to sulfonyl urea derivatives. Changes in the plasma and lipoprotein concentration of cholesterol (ChS) and triglycerides (TG) were analyzed. According to the author's classification, changes in lipoprotein patterns were distributed in some phenotypes of dyslipoproteinemias (DLP) and their prevalence was studied among the examinees. DLPs were detected in 84.3% of the patients (59.8% were latent). The patients demonstrated a high frequency of hypocholesterolemia of very low density lipoproteins (57.8%) and hypertriglyceridemia of low density lipoproteins (31.4%). These intralipoprotein variations were shown to be the chief element of phenotypical characterization of II (c, d), IV (b, c) and VI (a, b, c) DLP types, not included in Fredrickson's classification.