• AUC for c-peptide responses following MMTT [ Time Frame: various ] [ Designated as safety issue: No ]
• frequency of severe hypoglycemia [ Time Frame: up to day 364 ] [ Designated as safety issue: Yes ]
• insulin dose in units per kilogram [ Time Frame: up to day 364 ] [ Designated as safety issue: No ]
• HbA1c levels [ Time Frame: up to day 364 ] [ Designated as safety issue: Yes ]

• AUC for c-peptide responses following MMTT [ Time Frame: various ]
• frequency of severe hypoglycemia [ Time Frame: up to day 364 ]
• insulin dose in units per kilogram [ Time Frame: up to day 364 ]
• HbA1c levels [ Time Frame: up to day 364 ]

This is a phase I trial in individuals who have been diagnosed with type 1 diabetes within the previous 3-48 months. The study is testing whether two immune system modifying drugs are safe when used in combination and if they have immune altering effects that indicate they can halt the progression of type 1 diabetes progression.

At the time of diagnosis with type 1 diabetes, 15-40% of beta cells may remain active and healthy in the pancreas, capable of producing insulin the body needs to regulate blood glucose levels. Because even small amounts of natural insulin production can decrease the long term effects of diabetes, it is essential that these cells are preserved.

This trial will test whether a combination of the drugs Proleukin (IL-2) and Rapamune (sirolimus) may be safely administered to recently diagnosed type 1 diabetes patients and whether it causes changes to the immune system that can halt the autoimmune destruction of the remaining beta cells. This drug combination has been found to be effective for long-term diabetes prevention in mouse models of type 1 diabetes.

This study is a phase I study for individuals 18-45 years of age who have been diagnosed with type 1 diabetes in the past 3-48 months. All participants will be treated with Proleukin (administered subcutaneously) for 28 days and Rapamune (taken orally) for 12 weeks. The study will last for 12 months, with possible additional follow-up of 24 months. Mixed meal tolerance tests, in which participants take a milkshake-like drink and have blood sampled over a 2-hour period, will take place during an initial screening visit and three additional times during the first year. All participants will also receive intensive diabetes management designed to maintain stable blood glucose levels.

• Drug: IL-2
• Drug: sirolimus

Inclusion Criteria:

• Diagnosed with type 1 diabetes (per ADA criteria) more than 3 but less than 48 months prior to enrollment
• Aged 18-45 years old
• positive for at least one islet cell autoantibody (GAD65-antibody, CA512-antibody and/or ICA)

Exclusion Criteria:

• chronic use of glucocorticoids or other immunosuppressive ages 4 weeks before enrollment
• History of recurrent infections, other autoimmune diseases, cardiac disease, cataracts or other chronic medical conditions that investigators believe could compromise participant safety
• females who are pregnant, lactating intend to get pregnant, or are unwilling to undergo pregnancy testing during the study
• males who intend to father a pregnancy during the first 6 months of the study
• participation in another clinical study within the last 30 days