Serum proteins, particularly complements such as β
1-C / A-globulin (β
1C / A) and β
1-E-globulin (β
1E), proteinase inhibitors such as α
1-Antitrypsin (α
1AT), α
1-Antichymotrypsin (α
1X), Inter-α-Trypsininhibitor (IαI), α
2-Macroglobulin (α
2M), and Antithrombin III (AthIII), and other glycoproteins such as α
1-Acid-Glycoprotein (α
1AG), Ceruloplasmin (Cp), Haptoglobin (Hp), and Transferrin (Tf) were quantitatively measured by the use of the single radial immunodiffusion method in 122 cases of diabetes mellitus and in 23 normal adults (group H).
Diabetic patients were divided into three groups, group D: 44 diabetics without clinical mannifestations of microangiopathy, group R: 61 diabetics with retinopathy, and group N: 17 diabetics with nephropathy.
The results are summarized in the following. (1) In group D, increase of both β
1C/A and β
1E and decrease of AthIII were observed. (2) In group R, an increase of α
2M was observed in addition to the changes found in group D. (3) In group N, tendency of α
1AG to increase, a significant increase of α
1AT, and a remarkable increase of α
2M were observed in addition to the changes found in other two groups. (4) In patients being treated with insulin, increase ofα
2M was demonstrated with seemed to become more pronounced as the involvement of microangiopathy progressed.
As these serum proteins, the changes of which were observed in our study, are mostly closely related to the coagulation and fibrinolysis systems of the blood, it is suggested that changes of these serum proteins in diabetic patients would reflect one of the clues to elucidate the pathogenesis of diabetic microangiopathy, and that diabetic patients showing remarkable changes of these serum proteins might need careful clinical management in order to prevent progression of microangiopathy.
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