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2016 ; 6
(ä): 153-158
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Attention deficit-hyperactivity disorder suffers from mitochondrial dysfunction
#MMPMID27896136
Verma P
; Singh A
; Nthenge-Ngumbau DN
; Rajamma U
; Sinha S
; Mukhopadhyay K
; Mohanakumar KP
BBA Clin
2016[Dec]; 6
(ä): 153-158
PMID27896136
show ga
BACKGROUND: Pathophysiology of attention-deficit hyperactivity disorder (ADHD) is
not known, and therefore the present study investigated mitochondrial defects, if
any in cybrids created from patients and control population. METHODS: To
investigate mitochondrial pathology in ADHD, cybrids cell lines were created from
ADHD probands and controls by fusing their platelets with ?(0)-cells prepared
from SH-SY5Y neuroblastoma cell line. Cellular respiration, oxidative stress,
mitochondrial membrane potential and morphology were evaluated employing
oxygraph, mitochondria-specific fluorescence staining and evaluation by FACS, and
immunocytochemistry. HPLC-electrochemical detection, quantitative RT-PCR and Blue
Native PAGE were employed respectively for assays of serotonin, mitochondrial
ATPase 6/8 subunits levels and complex V activity. RESULTS: Significantly low
cellular and mitochondrial respiration, ATPase6/8 transcripts levels,
mitochondrial complex V activity and loss of mitochondrial membrane potential and
elevated oxidative stress were observed in ADHD cybrids. Expression of monoamine
oxidizing mitochondrial enzymes, MAO-A and MAO-B levels remained unaffected.
Two-fold increase in serotonin level was noted in differentiated cybrid-neurons.
CONCLUSIONS: Since cybrids are shown to replicate mitochondrial defects seen in
post-mortem brains, these observed defects in ADHD cybrids strongly suggest
mitochondrial pathology in this disorder. GENERAL SIGNIFICANCE: Mitochondrial
defects are detected in ADHD cybrids created from patients' platelets, implying
bioenergetics crisis in the mitochondria could be a contributory factor for ADHD
pathology and/or phenotypes.