TY - JOUR
T1 - Peptide Binding Glucose Regulated Protein 78 Improves Type 1 Diabetes by Preventing Pancreatic β Cell Apoptosis
AU - Raiter, A.
AU - Tenenbaum, A.
AU - Yackobovitch-Gavan, M.
AU - Battler, A.
AU - Hardy, B.
N1 - Publisher Copyright:
© J. A. Barth Verlag in Georg Thieme Verlag KG Stuttgart, New York.
PY - 2016/4/1
Y1 - 2016/4/1
N2 - Background and Objectives: Diabetes Type 1 is characterized by hyperglycemia due to reduced insulin secretion that results from the death of pancreatic β cells. It was suggested that endoplasmic reticulum (ER) stress is associated with the autoimmune-mediated β cell destruction. Glucose regulated protein 78 (GRP78) functions as a key regulator to maintain the ER function. Under stress conditions GRP78 is up-regulated and expressed on the cell surface serving as a signaling receptor. Our first objective was to examine the effects of peptide binding cell surface GRP78 to reduce the deleterious effects of diabetes induced by streptozotocin. The second objective was to demonstrate the ability of the peptide to protect the pancreatic β cells from apoptosis. Methods: The effect of ADoPep on weight loss, HbA1c levels and anti GRP78 antibody titers was evaluated in a diabetes mouse model. The effect of ADoPep on the pancreatic β Ins1E cell apoptosis was determined by FACS analysis. Results: The administration of ADoPep to diabetic mice retained the weight loss and reduced HbA1c significantly in 60% of mice. Titers of anti GRP78 antibodies increased in 70% of the treated mice. Apoptosis was significantly inhibited in stressed pancreatic β Ins 1E cells. Conclusions: We demonstrate that administration of the peptide ADoPep to diabetic mice improved type 1 diabetes by preventing pancreatic β cell apoptosis.
AB - Background and Objectives: Diabetes Type 1 is characterized by hyperglycemia due to reduced insulin secretion that results from the death of pancreatic β cells. It was suggested that endoplasmic reticulum (ER) stress is associated with the autoimmune-mediated β cell destruction. Glucose regulated protein 78 (GRP78) functions as a key regulator to maintain the ER function. Under stress conditions GRP78 is up-regulated and expressed on the cell surface serving as a signaling receptor. Our first objective was to examine the effects of peptide binding cell surface GRP78 to reduce the deleterious effects of diabetes induced by streptozotocin. The second objective was to demonstrate the ability of the peptide to protect the pancreatic β cells from apoptosis. Methods: The effect of ADoPep on weight loss, HbA1c levels and anti GRP78 antibody titers was evaluated in a diabetes mouse model. The effect of ADoPep on the pancreatic β Ins1E cell apoptosis was determined by FACS analysis. Results: The administration of ADoPep to diabetic mice retained the weight loss and reduced HbA1c significantly in 60% of mice. Titers of anti GRP78 antibodies increased in 70% of the treated mice. Apoptosis was significantly inhibited in stressed pancreatic β Ins 1E cells. Conclusions: We demonstrate that administration of the peptide ADoPep to diabetic mice improved type 1 diabetes by preventing pancreatic β cell apoptosis.
KW - ADoPep peptide
KW - GRP78
KW - apoptosis
KW - diabetes type 1
KW - pancreatic β cells
KW - streptozotocin mouse model
UR - http://www.scopus.com/inward/record.url?scp=84964596033&partnerID=8YFLogxK
U2 - 10.1055/s-0035-1569356
DO - 10.1055/s-0035-1569356
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AN - SCOPUS:84964596033
SN - 0947-7349
VL - 124
SP - 239
EP - 245
JO - Experimental and Clinical Endocrinology and Diabetes
JF - Experimental and Clinical Endocrinology and Diabetes
IS - 4
ER -
