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2016 ; 5
(7
): e335
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Hairpin Ribozyme Genes Curtail Alcohol Drinking: from Rational Design to in vivo
Effects in the Rat
#MMPMID27404720
Sapag A
; Irrazábal T
; Lobos-González L
; Muñoz-Brauning CR
; Quintanilla ME
; Tampier L
Mol Ther Nucleic Acids
2016[Jul]; 5
(7
): e335
PMID27404720
show ga
Ribozyme genes were designed to reduce voluntary alcohol drinking in a rat model
of alcohol dependence. Acetaldehyde generated from alcohol in the liver is
metabolized by the mitochondrial aldehyde dehydrogenase (ALDH2) such that
diminishing ALDH2 activity leads to the aversive effects of blood acetaldehyde
upon alcohol intake. A stepwise approach was followed to design genes encoding
ribozymes targeted to the rat ALDH2 mRNA. In vitro studies of accessibility to
oligonucleotides identified suitable target sites in the mRNA, one of which
fulfilled hammerhead and hairpin ribozyme requirements (CGGUC). Ribozyme genes
delivered in plasmid constructs were tested in rat cells in culture. While the
hairpin ribozyme reduced ALDH2 activity 56% by cleavage and blockade (P <
0.0001), the hammerhead ribozyme elicited minor effects by blockade. The hairpin
ribozyme was tested in vivo by adenoviral gene delivery to UChB alcohol drinker
rats. Ethanol intake was curtailed 47% for 34 days (P < 0.0001), while blood
acetaldehyde more than doubled upon ethanol administration and ALDH2 activity
dropped 25% in liver homogenates, not affecting other ALDH isoforms. Thus,
hairpin ribozymes targeted to 16 nt in the ALDH2 mRNA provide durable and
specific effects in vivo, representing an improvement on previous work and
encouraging development of gene therapy for alcoholism.