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The presence of immunoreactive insulin in saliva and its relationship to plasma immunoreactive insulin was investigated in healthy subjects, newly diagnosed non-obese Type 2 (non-insulin-dependent) diabetic patients and obese non-diabetic subjects, basally and after an oral glucose tolerance test. The mean +/- SEM fasting values of plasma and salivary immunoreactive insulin were significantly higher in diabetic patients and obese non-diabetic subjects than in normal volunteers (p less than 0.05). During the glucose challenge, the increase of salivary insulin was related with that of plasma in the three groups of subjects, with a time lag in normal and obese subjects. In normal volunteers, plasma and salivary peak values were respectively 49.5 +/- 13.4 microU/ml (p less than 0.05 vs obese subjects) at 60 min and 12.0 +/- 3.3 microU/min (p less than 0.05 vs obese subjects) at 120 min; in diabetic patients, the values were 51.7 +/- 5.6 microU/ml (p less than 0.05 vs obese subjects) and 14.6 +/- 4.1 microU/min at 120 min; in obese subjects, the peak value for plasma insulin was 111.5 +/- 40.1 microU/ml at 90 min and for salivary insulin 15.6 +/- 5.1 microU/min at 120 min. A positive linear relationship was shown between plasma and salivary insulin during the oral glucose tolerance test. The identity of salivary insulin was assessed by reversed-phase HPLC. We conclude that salivary immunoreactive insulin can be found in Type 2 diabetic patients and in obese non-diabetic subjects, as well as normal volunteers, that plasma and salivary insulin are related after a glucose load, and that differences exist in salivary insulin secretion patterns among the three groups of subjects.

diabetologia

Salivary insulin concentrations in Type 2 (non-insulin-dependent) diabetic patients and obese non-diabetic subjects: Relationship to changes in plasma insulin levels after an oral glucose load