In vitro secretion of interleukin-1 beta and interferon-gamma by peripheral blood lymphomononuclear cells in diabetic patients.
There is evidence that cytokines, in particular interleukin-1 beta (IL-1 beta) and interferon-gamma (IFN-gamma) might mediate beta cell destruction in type 1 diabetes. Therefore the secretion of these cytokines by peripheral blood lymphomononuclear cells (PBMNC) was investigated in basal conditions and 48 h after stimulation with T-cell mitogen phytohaemagglutinin (PHA) in 33 diabetic patients and in 10 normal controls. The patients were divided in 4 groups (Group 1, 10 controls; Group 2, 13 newly diagnosed type 1 diabetics, the onset had occurred from 5 days to 3 months before the study; Group 3, 10 Long Standing (LS) type 1 diabetics with duration of the disease between 2 years and 10 years; and Group 4, 10 type 2 diabetics). No difference was found among the 4 groups considered in IL-1 beta secretion by unstimulated cultures, although the percentage of TAC+ cells was significantly higher in type 1 newly diagnosed diabetic patients with respect to the LS, the type 2 diabetics and the controls. After PHA stimulation a significant increase of IL-1 beta was found in newly diagnosed type 1 diabetic patients in comparison with the control subjects, the LS and type 2 diabetic patients (P < 0.001). The supernatants of newly diagnosed type 1 diabetics also showed a significant reduction in IFN-gamma production both in basal (P < 0.01) and in stimulated conditions (P < 0.001) in comparison with the controls, the LS (P < 0.002 in basal, and P < 0.001 in stimulated conditions) and the type 2 diabetic patients (P < 0.001 both in basal and stimulated conditions).(ABSTRACT TRUNCATED AT 250 WORDS)
Ciampolillo
A
A
Istituto di Clinica Medica, Università di Bari, Policlinico P.zza Giulio Cesare, Italy.
Guastamacchia
E
E
Caragiulo
L
L
Lollino
G
G
De Robertis
O
O
Lattanzi
V
V
Giorgino
R
R
D000328:Adult; D001786:Blood Glucose / Q000032:analysis; D002478:Cells, Cultured; D003922:Diabetes Mellitus, Type 1 / Q000097:blood / Q000276:immunology*; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000276:immunology*; D005260:Female; D006442:Glycated Hemoglobin / Q000032:analysis; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis* / Q000097:blood; D007375:Interleukin-1 / Q000096:biosynthesis* / Q000097:blood; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000276:immunology*; D008297:Male; D010835:Phytohemagglutinins; D012016:Reference Values; D013601:T-Lymphocytes / Q000276:immunology*
D001786:Blood Glucose; D006442:Glycated Hemoglobin; D007371:Interferon-gamma; D007375:Interleukin-1; D010835:Phytohemagglutinins