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The Population Prevalence, Associations of Congenital Heart Defect and Mortality Risk for Down’s Syndrome in South Korea Based on National Health Insurance Service (NHIS) Data
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Growth hormone (GH) has been frequently used to control the aging process in healthy individuals, probably due to its slowing effect on senescence-associated degeneration. Mitochondrial dysfunction is related to the aging process, and one of the chemical models of Huntington’s disease is that it can be induced by mitochondrial toxin. To investigate the potential application of GH to modify the progression of Huntington’s disease (HD), we examined whether GH can protect the functional deterioration by striatal damage induced by 3-nitropropionic acid (3NP).
3NP (63 mg/kg/day) was delivered to Lewis rats by osmotic pumps for five consecutive days, and the rats received intraperitoneal administration of GH or vehicle (saline) throughout the experiment. Neurological deficits and body weight were monitored. A 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) test was performed to further determine the mitochondrial activity in cultured N18TG2 neuroblastoma cells
3NP-treated rats showed progressive neurologic deficits with striatal damage. Application of GH accelerated behavioral deterioration, particularly between day 3 and day 5, resulting in reduced survival outcome. The body weights of rats given 3NP were decreased, but GH did not affect such decrease compared to the non-treated control group. The effect of GH on cultured neuronal cells was a decrease in the MTT absorbance, suggesting a lower number of cells in a dose dependent pattern.
Those results suggest that application of GH to a 3NP-induced experimental model of HD deteriorates the progress of functional deficits, possibly disturbing mitochondrial activities.
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MicroRNAs (miRNAs) are small RNAs comprised of 20–25 nucleotides that regulates gene expression by inducing translational repression or degradation of target mRNA. The importance of miRNAs as a mediator of disease pathogenesis and therapeutic targets is rapidly emerging in neuroscience, as well as oncology, immunology, and cardiovascular diseases. In Parkinson’s disease and related disorders, multiple studies have identified the implications of specific miRNAs and the polymorphisms of miRNA target genes during the disease pathogenesis. With a focus on Parkinson’s disease, spinocerebellar ataxia, hereditary spastic paraplegia, and Huntington’s disease, this review summarizes and interprets the observations, and proposes future research topics in this field.
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