Abstract
Diabetic cardiomyopathy (DC) is a unique disease frequently complicated to diabetes mellitus, manifesting endoplasmic reticulum (ER) stress and depressed calcium-handling proteins. We hypothesized that the abnormal FKBP12.6, SERCA2a, and CASQ2 are consequent to ER stress and apoptosis that are likely due to an entity of inflammation. These abnormalities may be attributed to reactive oxygen species genesis from activated NADPH oxidase which could respond to argirein (AR) through its anti-inflammatory activity. Sprague Dawley rats were randomly divided into six groups. Except the normal group, rats were injected with streptozotocin (STZ; 60 mg/kg, i.p.) once. During weeks 5 to 8 following STZ injection, rats were treated (in milligrams per kilogram per day, i.g.) with aminoguanidine (AMG, 100; an inducible nitric oxide synthase and AGEs inhibitor) or three doses of AR (50, 100, and 200). FKBP12.6, SERCA2a, and CASQ2 and ER stress chaperones Bip and PERK and apoptotic molecules were monitored in vivo and in vitro. Impaired cardiac performance and downregulated FKBP12.6, SERCA2a, and CASQ2 were significant in DC in vivo, and abnormal calcium-handling proteins were also found in high-glucose-incubated myocytes in vitro. ER stress manifested by upregulated Bip and PERK was predominant in association with DNA ladder and upregulated Bax and downregulated BCL-2 in vivo and in vitro. AR is effective to attenuate these abnormalities compared to AMG. Diabetic myocardium has inflammatory entity expressed as ER stress contributing to downregulated calcium-handling proteins. AR has potential in managing DC through attenuating depressed calcium-handling proteins, activated ER stress, and apoptosis in the myocardium.
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Abbreviations
- AGEs:
-
Advanced glycation end products
- AMG:
-
Aminoguanidine
- AR:
-
Argirein
- ATF-4:
-
Activating transcription factor-4
- ATF-6:
-
Activating transcription factor-6
- AT1:
-
Angiotensin 1 receptors
- Bip:
-
Immunoglobulin heavy chain binding protein
- Bax:
-
BCL-2 associated X protein
- BCL-2:
-
B cell CLL/lymphoma
- CASQ2:
-
Calsequestrin 2
- CHOP:
-
C/EBP homologous protein
- DC:
-
Diabetic cardiomyopathy
- DM:
-
Diabetes mellitus
- ER stress:
-
Endoplasmic reticulum stress
- ER:
-
Endoplasmic reticulum
- ETA :
-
Endothelin receptor A
- FKBP12.6:
-
FK506 binding protein 12.6
- iNOS:
-
Inducible nitric oxide synthase
- IRE1:
-
Inositol-requiring enzyme-1
- PERK:
-
PKR-like eukaryotic initiation factor 2α kinase
- ROS:
-
Reactive oxygen species
- RyR2:
-
Ryanodine receptor subtype 2
- STZ:
-
Streptozotocin
- SERCA2a:
-
Sarco/endoplasmic reticulum calcium ATPase 2a
- SD:
-
Sprague Dawley
- UPR:
-
Unfolded protein response
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Acknowledgments
This work was supported by National Natural Science Foundation of China, no. 81070145.
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The authors declare that they have no conflicts of interest to disclose.
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F.H. Shi and Y.S. Cheng contributed to the paper equally as co-first authors.
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Shi, F.H., Cheng, Y.S., Dai, D.Z. et al. Depressed calcium-handling proteins due to endoplasmic reticulum stress and apoptosis in the diabetic heart are attenuated by argirein. Naunyn-Schmiedeberg's Arch Pharmacol 386, 521–531 (2013). https://doi.org/10.1007/s00210-013-0852-5
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DOI: https://doi.org/10.1007/s00210-013-0852-5