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High-mobility group box 1 expressions in hypoxia-induced damaged mouse islets
T Itoh1, S Iwahashi, M Shimoda
1Baylor Research Institute, Islet Cell Laboratory, Dallas, Texas, USA.
Transplantation Proceedings
|November 22, 2011
Summary
High-mobility group box 1 (HMGB1) is released from damaged islets exposed to hypoxia. Increased HMGB1 levels indicate islet damage and may serve as a marker for islet potency assays.
Area of Science:
- Cell Biology
- Transplantation Immunology
- Biochemistry
Background:
- Assessing islet quality is crucial for successful transplantation.
- High-mobility group box 1 (HMGB1) has been identified in damaged islets.
- Islets are susceptible to hypoxic damage during procurement and storage.
Purpose of the Study:
- To investigate HMGB1 expression and release in mouse islets subjected to hypoxia.
- To determine if HMGB1 can serve as a damage marker for isolated islets.
Main Methods:
- Mouse islets were exposed to hypoxic conditions.
- HMGB1 expression was analyzed using quantitative real-time PCR, Western blotting, and ELISA.
- Islet function was assessed via transplantation into diabetic mice.
Main Results:
- Hypoxia induced HMGB1 translocation from the nucleus to the cytoplasm in islets.
- HMGB1 messenger RNA (mRNA) levels increased under hypoxic conditions.
- Released HMGB1 levels, particularly per hour, were significantly elevated in damaged islets.
Conclusions:
- Hypoxia triggers HMGB1 synthesis and release from damaged islets.
- Released HMGB1 may function as a valuable biomarker for detecting islet damage.
- HMGB1 quantification could be utilized in islet potency assays for transplantation.
