Abstract
Glycation, one of the post-translational modifications, is known to influence protein structure and biological function. Advanced glycation end products (AGEs) have been shown to cause pathologies of diabetes. Glycation levels in patients with Alzheimer’s disease (AD) are higher than in normal people. However, whether the glycation of susceptible proteins is a triggering event for cell damage or simply a result remains to be elucidated. In this study, we demonstrated that ribose-conjugated BSA (Rib-BSA) directly induces PC12 cell death in a dose- and time-dependent manner. The IC50 is 4.6 μM. Unlike glucose-incubated BSA, Rib-BSA rapidly forms cytotoxic AGEs. PC12 is vulnerable to Rib-BSA. However, fructose can induce AGE formation, although no effect on cell survival was observed. This effect of Rib-BSA is reversed by pretreatment of pioglitazone and rosiglitazone, which belongs to thiazolidinediones (TZDs) and are peroxisome proliferator-activated receptor (PPAR-γ) ligands. Moreover, Rib-BSA upregulates inducible nitric oxide synthase (iNOS), cycloxygenase 2 (COX-2) expression, and p-38 phosphorylation and leaves extracellular regulated protein1/2 (ERK1/2) phosphorylation unchanged. The Rib-BSA-induced signaling changes are blocked by rosiglitazone and confirmed by PPAR-γ small-interfering RNA transfection. The reduction of cell survival by Rib-BSA is blocked by the iNOS inhibitor and p38 inhibitor. No effect on cell survival was observed using the COX-2 inhibitor. Consequently, these results show that Rib-BSA directly inducing PC12 cell death is a triggering event and TZDs protect PC12 cell from Rib-BSA damage. Signaling molecules, such as PPAR-γ, P38, and iNOS, are involved in Rib-BSA-mediated cytotoxicity.
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Abbreviations
- AGE:
-
Advanced glycation endproducts
- BSA:
-
Bovine serum albumin
- AD:
-
Alzheimer’s disease
- PC12 cell:
-
Pheochromocytoma cell
- Rib-BSA:
-
Ribose-conjugated BSA
- Glc-BSA:
-
Glucose-conjugated BSA
- Frc-BSA:
-
Fructose-conjugated BSA
- DM:
-
Diabetes mellitus
- iNOS:
-
Inducible nitric oxide synthase
- COX-2:
-
Cycloxygenase 2
- ERK:
-
Extracellular regulated protein
- MTT:
-
3-(4,5-Cimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide
- TZD:
-
Thiazolidinedione
- PPAR-γ:
-
Peroxisome proliferator-activated receptor-γ
- RAGEs:
-
Receptor for AGEs
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Acknowledgments
This work was supported by a Grant from the National Science Council of Taiwan (NSC99-2314-B-197-001-MY3) and a research fund from the Medical Research Center, Cardinal Tien Hospital in Taiwan (CTH-99-1-2A18 & CTH-100-1-2A06). Mass spectrometry analyses were performed by Ms. Tzu-Pei Fan at the MS facilities of the Genomics Research Center, Academia Sinica, and the Core Facilities for Protein Structural Analysis at the Institute of Biological Chemistry, Academia Sinica, supported by a National Science Council grant (NSC100-2325-B-001-029) and the Academia Sinica.
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T.-Y. Kuo and C.-L. Huang contributed equally to this work and should be considered as co-first authors.
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Fig. S1
Knockdown of PPAR-γ reverses the effect of pioglitazone (Pio, 10 μM) and rosiglitazone (Ro, 5 μM) on cytotoxicity induced by Rib-BSA in PC12 cells. a PPAR-γ siRNA was transfected 24 h earlier, followed by treatment of pioglitazone (Pio, 10 μM). Eight hours later, Rib-BSA (4 μM) was administered for 24 h for cell viability assay. b PPAR-γ siRNA was transfected 24 h earlier, followed by treatment of rosiglitazone (Ro, 5 μM). Eight hours later, Rib-BSA (4 μM) was administered for 24 h for cell viability assay. MTT assay was performed for cell viability. N = 9 each group, in three independent experiments. Data expressed as mean ± SEM. *p < 0.05 and **p < 0.01. *Compare with the control group. # p < 0.05 and ## p < 0.01, compared with the Rib-BSA group. (PPT 186 kb)
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Kuo, TY., Huang, CL., Yang, JM. et al. The role of ribosylated-BSA in regulating PC12 cell viability. Cell Biol Toxicol 28, 255–267 (2012). https://doi.org/10.1007/s10565-012-9220-3
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DOI: https://doi.org/10.1007/s10565-012-9220-3