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2018 ; 6
(14
): e13732
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Butyrate regulates inflammatory cytokine expression without affecting oxidative
respiration in primary astrocytes from spontaneously hypertensive rats
#MMPMID30039527
Yang T
; Rodriguez V
; Malphurs WL
; Schmidt JT
; Ahmari N
; Sumners C
; Martyniuk CJ
; Zubcevic J
Physiol Rep
2018[Jul]; 6
(14
): e13732
PMID30039527
show ga
Neurons and glia exhibit metabolic imbalances in hypertensive animal models, and
loss of metabolic homeostasis can lead to neuroinflammation and oxidative stress.
The objective of this study was to determine the effects of the microbial
metabolite butyrate on mitochondrial bioenergetics and inflammatory markers in
mixed brainstem and hypothalamic primary cultures of astrocytes between
normotensive (Sprague-Dawley, S-D) and spontaneously hypertensive (SHR) rats.
Bioenergetics of mitochondria in astrocytes from normotensive S-D rats were
modified with butyrate, but this was not the case in astrocytes derived from SHR,
suggesting aberrant mitochondrial function. Transcripts related to oxidative
stress, butyrate transporters, butyrate metabolism, and neuroinflammation were
quantified in astrocyte cultures treated with butyrate at 0, 200, 600, and
1000 ?mol/L. Butyrate decreased catalase and monocarboxylate transporter 1 mRNA
in astrocytes of S-D rats but not in the SHR. Moreover, while butyrate did not
directly regulate the expression of 3-hydroxybutyrate dehydrogenase 1 and 2 in
astrocytes of either strain, the expression levels for these transcripts in
untreated cultures were lower in the SHR compared to S-D. We observed higher
levels of specific inflammatory cytokines in astrocytes of SHR, and treatment
with butyrate decreased expression of Ccl2 and Tlr4 in SHR astrocytes only.
Conversely, butyrate treatment increased expression of tumor necrosis factor in
astrocytes from SHR but not from the S-D rats. This study improves our
understanding of the role of microbial metabolites in regulating astrocyte
function, and provides support that butyrate differentially regulates both the
bioenergetics and transcripts related to neuroinflammation in astrocytes from SHR
versus S-D rats.