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Neurosci Lett. 2017 Jul 13;653:152-158. doi: 10.1016/j.neulet.2017.05.059. Epub 2017 May 29.

Blood-brain barrier disruption in diabetic mice is linked to Nrf2 signaling deficits: Role of ABCB10?

Author information

1
Department of Pharmaceutical Sciences, Texas Tech University Health Sciences Center, Amarillo, TX 79109, USA. Electronic address: ravi.sajja@ttuhsc.edu.
2
Department of Pharmaceutical Sciences, Texas Tech University Health Sciences Center, Amarillo, TX 79109, USA. Electronic address: shikha.prasad@ttuhsc.edu.
3
Department of Pharmaceutical Sciences, Texas Tech University Health Sciences Center, Amarillo, TX 79109, USA. Electronic address: sntang@gmail.com.
4
Department of Pharmaceutical Sciences, Texas Tech University Health Sciences Center, Amarillo, TX 79109, USA. Electronic address: md.a.kaisar@ttuhsc.edu.
5
Department of Pharmaceutical Sciences, Texas Tech University Health Sciences Center, Amarillo, TX 79109, USA. Electronic address: luca.cucullo@ttuhsc.edu.

Abstract

Blood-brain barrier (BBB) damage is a critical neurovascular complication of diabetes mellitus that adversely affects the CNS health and function. Previously, we showed the protective role of NF-E2 related factor-2 (Nrf2), a redox sensitive transcription factor, in regulation of BBB integrity. Given the pathogenic role of mitochondrial oxidative stress in diabetes-related microvascular complications, we focused on assessing: 1) the impact of diabetes on brain Nrf2 in correlation with BBB permeability and 2) Nrf2-dependent regulation of the mitochondrial transporter ABCB10, an essential player in mitochondrial function and redox balance at BBB endothelium. Using live animal fluorescence imaging, we demonstrated a strong increase in BBB permeability to 70kDa dextran in db/db diabetic mice that correlated with significant down-regulation of brain Nrf2 protein. Further, Nrf2 gene silencing in human BBB endothelial cells markedly suppressed ABCB10 protein, while Nrf2 activation by sulforaphane up-regulated ABCB10 expression. Interestingly, ABCB10 knockdown resulted in a strong-induction of Nrf2 driven anti-oxidant responses as evidenced by increased expression of Nrf2 and its downstream targets. Nrf2 or ABCB10 silencing elevated endothelial-monocyte adhesion suggesting an activated inflammatory cascade. Thus, our results demonstrate a novel mechanism of ABCB10 regulation driven by Nrf2. In summary, Nrf2 dysregulation and ABCB10 suppression could likely mediate endothelial oxidative/inflammatory stress and BBB disruption in diabetic subjects.

KEYWORDS:

ABCB10; In vivo imaging; Leukocyte; Mitochondria; Oxidative stress; db/db mice

PMID:
28572033
PMCID:
PMC5520987
DOI:
10.1016/j.neulet.2017.05.059
[Indexed for MEDLINE]
Free PMC Article

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