TY - JOUR
T1 - Autophagy protects against human islet amyloid polypeptide-associated apoptosis
AU - Morita, Shuhei
AU - Sakagashira, Setsuya
AU - Shimajiri, Yoshinori
AU - Eberhardt, Norman L.
AU - Kondo, Toshikazu
AU - Kondo, Tomoyoshi
AU - Sanke, Tokio
PY - 2011/2
Y1 - 2011/2
N2 - Aims/Introduction: Islets in type2 diabetes are characterized by deposition of islet amyloid polypeptide (IAPP) as well as β-cell dysfunction. The unique amyloidogenic character of human (h)IAPP is associated with cytotoxicity. Autophagy is a ubiquitous system of cellular recycling that contributes to cell survival. Thus, we examined whether autophagy could ameliorate hIAPP-associated cytotoxicity. Materials and Methods: First, we used a COS-1 cell model, lacking endogenous IAPP that might affect cytotoxicity related to exogenous hIAPP. Next, we used the mouse β-cell line, MIN-6 cells. Both cells were transfected with hIAPP or rat (r)IAPP expression constructs, or transfected with bicistronic vectors expressing green fluorescent protein (GFP) and either hIAPP or rIAPP for flow cytometry analysis. Cell viability and apoptosis markers were studied in relation to chemical or genetic modulation of autophagy. Results: The viability of cells expressing hIAPP was significantly decreased as compared with those expressing rIAPP and the cleavage of pro-caspase-3 was elevated in hIAPP-transfected cells. The formation of autophagosomes and the conversion of microtubule-associated protein light chain 3BI to II were elevated in hIAPP-expressing cells. The viability of hIAPP-expressing cells was increased after treatment with rapamycin, an inducer of autophagy, and decreased after treatment with 3-methyladenine, an inhibitor of autophagy. In MIN-6 cells, annexin positive cells were increased by 3-methyladenine and decreased by rapamycin using flow cytometry. Knocking down of the autophagy protein 5 gene decreased hIAPP-transfected cell viability. Conclusions: Autophagy is co-localized with hIAPP expression and it plays a protective role in hIAPP-associated apoptosis.
AB - Aims/Introduction: Islets in type2 diabetes are characterized by deposition of islet amyloid polypeptide (IAPP) as well as β-cell dysfunction. The unique amyloidogenic character of human (h)IAPP is associated with cytotoxicity. Autophagy is a ubiquitous system of cellular recycling that contributes to cell survival. Thus, we examined whether autophagy could ameliorate hIAPP-associated cytotoxicity. Materials and Methods: First, we used a COS-1 cell model, lacking endogenous IAPP that might affect cytotoxicity related to exogenous hIAPP. Next, we used the mouse β-cell line, MIN-6 cells. Both cells were transfected with hIAPP or rat (r)IAPP expression constructs, or transfected with bicistronic vectors expressing green fluorescent protein (GFP) and either hIAPP or rIAPP for flow cytometry analysis. Cell viability and apoptosis markers were studied in relation to chemical or genetic modulation of autophagy. Results: The viability of cells expressing hIAPP was significantly decreased as compared with those expressing rIAPP and the cleavage of pro-caspase-3 was elevated in hIAPP-transfected cells. The formation of autophagosomes and the conversion of microtubule-associated protein light chain 3BI to II were elevated in hIAPP-expressing cells. The viability of hIAPP-expressing cells was increased after treatment with rapamycin, an inducer of autophagy, and decreased after treatment with 3-methyladenine, an inhibitor of autophagy. In MIN-6 cells, annexin positive cells were increased by 3-methyladenine and decreased by rapamycin using flow cytometry. Knocking down of the autophagy protein 5 gene decreased hIAPP-transfected cell viability. Conclusions: Autophagy is co-localized with hIAPP expression and it plays a protective role in hIAPP-associated apoptosis.
KW - Autophagy
KW - Islet amyloid polypeptide
KW - Type2 diabetes
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U2 - 10.1111/j.2040-1124.2010.00065.x
DO - 10.1111/j.2040-1124.2010.00065.x
M3 - Article
AN - SCOPUS:79960512207
SN - 2040-1116
VL - 2
SP - 48
EP - 55
JO - Journal of Diabetes Investigation
JF - Journal of Diabetes Investigation
IS - 1
ER -