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Melatonin rhythms in mice: role in autoimmune and lymphoproliferative diseases
1Centre for Experimental Pathology, Istituto Cantonale di Patologia, Locarno, Switzerland. aconti@guest.cscs.ch
Abstract:
Production of melatonin (MLT) in the pineal gland (PG) of inbred mice such as C57BI/6J, BALB/c, and AKR strains is still a matter of debate. In a recent study we validated the presence of MLT in the PG of these inbred mice. We found a short-term MLT peak in the middle of the dark period with a pattern that mirrors that found previously in the serum. In another study, based on the known immunoregulatory role of MLT, we investigated the role of the PG and MLT in autoimmune diabetes mellitus type I using, as an experimental model, female nonobese diabetic (NOD) mice. Mice were pinealectomized or treated chronically with MLT (injected subcutaneously or administered via drinking water). We found that neonatal pinealectomy accelerates the development of disease in female NOD mice, whereas exogenous MLT protects animals. This is in spite of the fact that MLT increased the production of insulin autoantibodies (IAA). We conclude that PG and MLT influence the development of autoimmune diabetes, although the mechanism of action needs further investigation.
Insights
Melatonin (MLT) is present in the mouse pineal gland (PG). MLT influences autoimmune diabetes, with pinealectomy accelerating disease and MLT treatment offering protection in nonobese diabetic mice.
Area of Science:
- Neuroendocrinology
- Immunology
- Metabolic Disorders
Background:
- The production of melatonin (MLT) in the pineal gland (PG) of inbred mice remains debated.
- MLT is known for its immunoregulatory functions.
Purpose of the Study:
- To validate MLT presence in the PG of C57BI/6J, BALB/c, and AKR mice.
- To investigate the role of the PG and MLT in autoimmune diabetes mellitus type I using nonobese diabetic (NOD) mice.
Main Methods:
- Validated MLT presence in the PG of inbred mice strains.
- Utilized pinealectomy and chronic MLT administration (subcutaneous injection, drinking water) in female NOD mice.
Main Results:
- Confirmed a short-term MLT peak in the PG during the dark period, mirroring serum patterns.
- Neonatal pinealectomy accelerated autoimmune diabetes in female NOD mice.
- Exogenous MLT administration protected NOD mice from disease development, despite increasing insulin autoantibodies (IAA).
Conclusions:
- The pineal gland and MLT significantly influence autoimmune diabetes development.
- The precise mechanisms by which MLT affects autoimmune diabetes require further investigation.