Abstract
This study aims to characterize the bone-protecting effects of Alpha-lipoic acid (ALA), a potent antioxidant, against the detrimental effects of the coexistence of type 2 diabetes mellitus (T2DM) and postmenopausal osteoporosis (POP) and identify the possible mechanisms with particular reference to its modulation of YAP/Glut4 pathway. The T2DM and POP coexisting model was induced in mice by high fat diet (HFD) + Streptozocin (STZ) + ovariectomy (OVX). The mice in the treatment groups were given ALA for 10 weeks. In the in vitro study, MC3T3-E1 cells were induced with 500 μM methylglyoxal for 24 h with or without pretreatment with ALA for 24 h. The oxidative and antioxidative biomarkers, bone microarchitecture, histo-morphology, and related protein expression of apoptosis, osteogenic differentiation and the YAP/Glut4 pathway were detected. The results showed ALA could improve glucose tolerance, inhibit oxidative stress and apoptosis and alleviate bone loss. Further study by siRNA technology revealed that the YAP/Glut4 pathway was implicated in the pathogenesis of bone loss due to the coexistence of T2DM and POP. Taken together, the present study has demonstrated for the first time that ALA exerts potent protective effects against bone loss in T2DM and POP coexisting conditions by modulating the YAP/Glut4 pathway.
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Data availability
The data used to support the findings of this study are available from the corresponding authors upon request.
Abbreviations
- ALA:
-
alpha-lipoic acid
- T2DM:
-
type 2 diabetes mellitus
- POP:
-
postmenopausal osteoporosis
- HFD:
-
high fat diet
- STZ:
-
streptozocin
- OVX:
-
ovariectomy
- OP:
-
osteoporosis
- ER:
-
estrogen receptor
- BMD:
-
bone mineral density
- MG:
-
Methylglyoxal
- FBS:
-
fetal bovine serum
- FBG:
-
fasting blood glucose
- PBG:
-
postprandial blood glucose
- BV:
-
bone volume
- BS:
-
bone surface
- ROI:
-
region of interest
- GP:
-
growth plate
- HE:
-
hematoxylin and eosin
- LDH:
-
lactate dehydrogenase
- SOD:
-
superoxide dismutase
- MDA:
-
malonaldehyde
- GSH:
-
glutathione
- DCFH-DA:
-
2,7-dichlorofluorescein diacetate
- PVDF:
-
polyvinyl difluoride
- EMD:
-
membranes
- TBS:
-
tris-buffered saline
- LSD:
-
least significant difference
- OGTT:
-
oral glucose tolerance test
- GP:
-
growth plate
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Author contributions
All authors contributed to the study conception and design. H.S. and M.L. conceived and designed this study. L.X. and C.Z. performed the major experiments and data analysis and drafted the manuscript. C.W., J.B., G.H., Y.C. and G.X. provided technological support. All the authors have read and approved this manuscript.
Funding
The work was supported in part by grants from Important Science Fund of Science and Technology Bureau of Liaoning Province (2020JH2/10300056) and Fund of Department of Education of Liaoning Provincial (No. LZ2019016).
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Xu, L., Zhang, C., Bao, J. et al. Alpha-lipoic Acid Prevents Bone Loss in Type 2 Diabetes and Postmenopausal Osteoporosis Coexisting Conditions by Modulating the YAP/Glut4 Pathway. Cell Biochem Biophys (2024). https://doi.org/10.1007/s12013-024-01216-w
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DOI: https://doi.org/10.1007/s12013-024-01216-w