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2015 ; 6
(9
): 1637-48
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Modulating Molecular Chaperones Improves Mitochondrial Bioenergetics and
Decreases the Inflammatory Transcriptome in Diabetic Sensory Neurons
#MMPMID26161583
Ma J
; Pan P
; Anyika M
; Blagg BS
; Dobrowsky RT
ACS Chem Neurosci
2015[Sep]; 6
(9
): 1637-48
PMID26161583
show ga
We have previously demonstrated that modulating molecular chaperones with KU-32,
a novobiocin derivative, ameliorates physiologic and bioenergetic deficits of
diabetic peripheral neuropathy (DPN). Replacing the coumarin core of KU-32 with a
meta-fluorinated biphenyl ring system created KU-596, a novobiocin analogue
(novologue) that showed neuroprotective activity in a cell-based assay. The
current study sought to determine whether KU-596 offers similar therapeutic
potential for treating DPN. Administration of 2-20 mg/kg of KU-596 improved
diabetes induced hypoalgesia and sensory neuron bioenergetic deficits in a
dose-dependent manner. However, the drug could not improve these neuropathic
deficits in diabetic heat shock protein 70 knockout (Hsp70 KO) mice. To gain
further insight into the mechanisms by which KU-596 improved DPN, we performed
transcriptomic analysis of sensory neuron RNA obtained from diabetic wild-type
and Hsp70 KO mice using RNA sequencing. Bioinformatic analysis of the
differentially expressed genes indicated that diabetes strongly increased
inflammatory pathways and that KU-596 therapy effectively reversed these
increases independent of Hsp70. In contrast, the effects of KU-596 on decreasing
the expression of genes regulating the production of reactive oxygen species were
more Hsp70-dependent. These data indicate that modulation of molecular chaperones
by novologue therapy offers an effective approach toward correcting nerve
dysfunction in DPN but that normalization of inflammatory pathways alone by
novologue therapy seems to be insufficient to reverse sensory deficits associated
with insensate DPN.