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The Journal of Immunology, Vol 157, Issue 10 4690-4696, Copyright © 1996 by American Association of Immunologists

ARTICLES

Decreased IL-4 production in new onset type I insulin-dependent diabetes mellitus

MA Berman, CI Sandborg, Z Wang, KL Imfeld, F Zaldivar Jr, V Dadufalza and BA Buckingham
Pediatric and Adolescent Diabetes Research and Education Foundation, Children's Hospital of Orange County, CA 92868, USA.

IL-4 has been shown to protect against diabetes development in rodent models of insulin-dependent (type I) diabetes mellitus (IDDM). To study IL-4 production in human IDDM, PBMC from IDDM patients and controls were stimulated in vitro with PHA, anti-CD3 mAb, or PMA and ionophore. IL-4 production by PBMC or T cells was strongly impaired in IDDM patients at diabetes onset (p < 0.0001). The mean IL-4 response of patients in the honeymoon stage was higher than the mean of the new onset patients, but significantly lower than the control group (p = 0.01). Patients with IDDM of longer duration (>2 yr) showed a wide range of IL-4 responses and their mean IL-4 response was lower than the controls; however, the difference was not statistically significant. IL- 4 mRNA levels were measured using competitive reverse transcription PCR. The results showed greatly reduced mRNA levels in new onset IDDM. In contrast, IL-1 production (measured by ELISA) and IFN-gamma mRNA (measured by reverse transcription PCR) were not significantly different in IDDM. The results suggest an imbalance of inflammatory vs anti-inflammatory cytokine production at the onset of IDDM. Deficient IL-4 production as seen at the onset of IDDM may play a role in the development of diabetes by allowing the inflammatory/autoimmune process in pancreatic islets to progress.


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