Highlights
- •We and others’ previous work led us to hypothesize that ABCA1 dysfunction could aggravate the renal injury in DM.
- •In this study, we generated a DM-ABCA1-/- mouse model to investigate the role of ABCA1 in GECs injury for the first time in DM.
- •ABCA1 deficiency contributed to inflammatory injury and apoptosis of GECs through endoplasmic reticulum stress in DM.
- •ABCA1 maybe a potential effective therapeutic target for early DKD progression.
Abstract
Background
Hyperglycemia and dyslipidemia are two major characteristics of diabetes. In this
study, the effects of glomerular cholesterol accumulation primarily due to ABCA1 deficiency
on glomerular endothelial injury in diabetic kidney disease (DKD) and the possible
mechanisms were investigated.
Methods
The effects of ABCA1 deficiency on glomerular lipid deposition and kidney injury were
examined in a type 2 diabetic mouse model with ABCA1 deficiency in glomerular endothelial
cells (DM-ABCA1−/− mice) and human renal glomerular endothelial cells (HRGECs) cultured
in high glucose and high cholesterol conditions, which simulated type 2 diabetes in
vitro.
Results
ABCA1 deficiency in glomerular endothelial cells exacerbated renal lipid deposition
and kidney injuries in type 2 diabetic mice and manifested as increased creatinine
levels, more severe proteinuria, mesangial matrix expansion and fusion of foot processes,
and more pronounced renal inflammatory injury and cell death. In HRGECs cultured under
high glucose and high cholesterol conditions, ABCA1 deficiency increased the deposition
of cellular cholesterol, contributed to inflammation and apoptosis, damaged the endothelial
glycocalyx barrier, and induced endoplasmic reticulum stress (ERS). Conversely, ABCA1
overexpression enhancing cholesterol efflux or inhibition of ERS in vitro, significantly
protected against glomerular endothelial injury stimulated by high glucose and high
cholesterol.
Conclusions
These findings establish a pathogenic role of ABCA1 deficiency in glomerular endothelium
injury and dysfunction and imply that ABCA1 may represent a potential effective therapeutic
target for early diabetic kidney disease.
Graphical abstract

Graphical Abstract
Keywords
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Article info
Publication history
Published online: December 12, 2022
Accepted:
December 6,
2022
Received:
June 24,
2022
Identification
Copyright
© 2022 Elsevier Inc. All rights reserved.