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Reduced Number of Circulating Monocytes After Institution of Insulin Therapy—Relevance for Development of Atherosclerosis in Diabetics?

Departments of Clinical Physiology, Central Hospital, Växjö, Sweden.

Hans Larsson, MD, PhD

Departments of Medicine, Central Hospital, Växjö, Sweden.

Hakan Odeberg, MD, PhD

Departments of Medicine, Central Hospital, Karlskrona, Sweden.

Twelve patients with Type II diabetes mellitus, insufficiently controlled with oral hypo glycemic agents, were studied before, after 2 months, and after 4 months on insulin therapy. For comparison the same variables were also studied in 10 healthy subjects. From the start, in the diabetic group, the authors found alterations in the hemorheologic parameters indicated by increased values for whole blood viscosity, plasma viscosity, red cell transit time (RCTT), and decreased values for white cell initial relative filtration rate (IrFR). In hematologic parameters they found increased values for mean corpuscular volume (MCV), leukocyte count, counts of neutrophils and monocytes, and a decreased count of lymphocytes. They also found increased values in the lipid parameters P-triglyc erides and Apo B/Apo A-I ratio, risk factors of coronary atherosclerosis. After 4 months of insulin treatment whole blood and plasma viscosity were still increased, but there was a partial improvement of lipoprotein abnormalities. Red and white cell filterability, however, tended to normalize. These results indicate that changes in blood cell filter ability do not necessarily influence in vitro measurements of blood viscosity. The change in RCTT during the insulin treatment was associated with a decreased MCV and the change in white cell IrFR with a decrease in the number of monocytes. This change of white cell filterability during insulin therapy, probably due to a reduced number of monocytes, may be of interest in the study of atherosclerosis and circulatory disease in diabetics.

Angiology, Vol. 49, No. 6, 423-433 (1998)
DOI: 10.1177/000331979804900602


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