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Review

Rationale for the Use of Histone Deacetylase Inhibitors as a Dual Therapeutic Modality in Multiple Sclerosis

Pages 67-75 | Received 25 Jan 2006, Accepted 05 Mar 2006, Published online: 07 Apr 2006
 

Abstract

Major recent advances in the field of chromatin remodeling have dramatically changed our understanding of the ways in which genes are regulated. Epigenetic regulators such as histone deacetylases (HDACs) and histone acetyltransferases (HATs) are increasingly being implicated as direct or indirect components in the regulation of expression of neuronal, immune and other tissue specific genes. HDACs and HATs have been shown to play important roles in cell growth, cell cycle control, development, differentiation and survival. Mutations in genes that encode HDAC-binding proteins cause neurological disorders, such as MeCP2 mutations in Rett's syndrome. Mutations of CBP, a gene with HAT function, cause the mental retardation-associated Rubinstein-Taybi syndrome. Recently, HDAC inhibitors have been found to ameliorate progression of the spinal muscular atrophy (SMA) motor neuron disease and the Huntington disease mouse models. The neuroprotective role of HDAC inhibitors seems to extend to other diseases that share mechanisms of oxidative stress, inflammation and neuronal cell apoptosis. HDAC inhibitors also have widespread modulatory effects on gene expression within the immune system and have been used successfully in the lupus and rheumatoid arthritis autoimmune disease models. Recently, we demonstrated the efficacy of the HDAC inhibitor Trichostatin A in ameliorating disease in the multiple sclerosis (MS) animal model, experimental autoimmune encephalomyelitis (EAE). In this review we describe the current literature surrounding these inhibitors and propose a rationale for harnessing both their neuroprotective and anti-inflammatory effects to treat MS, an autoimmune, demyelinating and degenerative disease of the human central nervous system (CNS).

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