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. 1994 Dec;98(3):489–493. doi: 10.1111/j.1365-2249.1994.tb05517.x

Circulating monocytes are activated in newly diagnosed type 1 diabetes mellitus patients.

K Josefsen 1, H Nielsen 1, S Lorentzen 1, P Damsbo 1, K Buschard 1
PMCID: PMC1534494  PMID: 7994912

Abstract

Investigations in the BB rat and the non-obese diabetic (NOD) mouse have provided substantial evidence for the involvement of the monocyte/macrophage system in the development of type 1 diabetes mellitus. However, it is not known whether monocytes play the same role in the pathogenesis of human type 1 diabetes. We investigated this problem in a longitudinal study of 29 recent-onset type 1 diabetes mellitus patients. Monocyte chemotaxis, phagocytosis and superoxide production as well as metabolic and haematological parameters were studied immediately after diagnosis and 6 months later. At diagnosis the patients had activated casein and C5a chemotaxis (casein 70 +/- 9 versus 150 +/- 5 (mean +/- s.e.m.), P < 0.001; C5a 137 +/- 10 versus 158 +/- 5, P < 0.05 (activation immobilizes monocytes, reducing the measured values)), and activated superoxide production (3.6 +/- 0.3 versus 3.0 +/- 0.3, P < 0.05). After 6 months casein chemotaxis (115 +/- 16 versus 150 +/- 5, P < 0.05) and Candida phagocytosis (3.3 +/- 0.1 versus 2.8 +/- 0.2, P < 0.001) were still activated. There was no correlation with other clinical or paraclinical parameters. We conclude that the circulating monocytes in newly diagnosed type 1 diabetes patients are activated. It is reasonable to expect that monocytes at the local site of inflammation in pancreas are even further activated. This could play a pathogenic role in beta cell destruction.

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Selected References

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