title: Potential of protease inhibitor in 3-nitropropionic acid induced Huntington's disease like symptoms: mitochondrial dysfunction and neurodegeneration.
abstract: Huntington's disease (HD) is a genetic, neurodegenerative disorder mainly characterized by motor dysfunction, cognitive decline and psychiatric disturbances. 3-Nitropropionic acid (3-NP) is an inhibitor of succinate dehydrogenase (Complex II) of the mitochondrial respiratory chain, which thereby reduces production of ATP. It induces neurotoxicity by causing striatal degeneration, energy deficit and oxidative stress. Angiotensin converting enzyme (ACE) is an important protease in the renin angiotensin system (RAS) responsible for the conversion of Angiotensin I to Angiotensin II. Angiotensin-II stimulates mitochondrial oxidant release leading to depression of energy metabolism. ACE inhibitors have shown promise in disorders like stress, anxiety, and depression in addition to showing beneficial effects in cognitive disorders like Alzheimer's. Angiotensin-II inhibition enhances energy production by lowering mitochondrial oxidant production, and hence protects mitochondrial structure. Trandolapril is a centrally active ACE inhibitor. 3-NP administered systematically (20mg/kg, i.p) for 4 days consecutively induced HD like symptoms - loss of body weight, neurobehavioral alterations like memory dysfunction (elevated plus maze, Morris water maze performance), Hind-limb impairment (Narrow beam test), motor incoordination (locomotor activity). Biochemical studies on brain tissue showed increased lipid peroxidation, nitrite levels and acetylcholinesterase activity along with decreased levels of reduced glutathione, catalase activity. Mitochondrial enzyme complex activities (I, II, IV and MTT assay) were found to be significantly lowered in brain mitochondria. Administration of Trandolapril (4 and 6 mg/kg, p.o) daily for 12 days showed significant improvement in body weight, neurobehavioral parameters, oxidative stress and mitochondrial enzyme activities in rat brain. These findings were further confirmed by histopathological studies which showed improvement in 3-NP induced brain lesions. This study indicates that Trandolapril could be an effective treatment option for the management of HD.
authors.affiliation: Department of Pharmacology, Bombay College of Pharmacy, Mumbai, India. Electronic address: ashwini.hariharan@gmail.com.
authors.forename: Ashwini
authors.initials: A
authors.lastname: Hariharan
authors.affiliation: Department of Pharmacology, Bombay College of Pharmacy, Mumbai, India.
authors.forename: Shruthi
authors.initials: S
authors.lastname: Shetty
authors.affiliation: Department of Pharmacology, Bombay College of Pharmacy, Mumbai, India.
authors.forename: Trupti
authors.initials: T
authors.lastname: Shirole
authors.affiliation: Department of Pharmacology, Bombay College of Pharmacy, Mumbai, India.
authors.forename: Aarti G
authors.initials: AG
authors.lastname: Jagtap
mesh_terms: D000806:Angiotensin-Converting Enzyme Inhibitors; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D005260:Female; D006816:Huntington Disease / Q000139:chemically induced / Q000188:drug therapy*; D007211:Indoles / Q000627:therapeutic use*; D018782:Maze Learning / Q000187:drug effects; D008928:Mitochondria / Q000187:drug effects* / Q000378:metabolism; D009043:Motor Activity / Q000187:drug effects; D009574:Nitro Compounds / Q000633:toxicity*; D011422:Propionates / Q000633:toxicity*; D051381:Rats; D017208:Rats, Wistar; D065852:Spatial Memory / Q000187:drug effects; D013385:Succinate Dehydrogenase / Q000378:metabolism
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D007211:Indoles; D009574:Nitro Compounds; D011422:Propionates; C052035:trandolapril; D013385:Succinate Dehydrogenase; C015392:3-nitropropionic acid
keywords: 3-Nitropropionic acid; Huntington's disease; Mitochondrial stress; Renin angiotensin system (RAS); Trandolapril