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Free radicals: important cause of pathologies refer to ageing.
Panminerva Med. 1999 Dec; 41(4):335-9.PM

Abstract

Free radical are highly reactive chemical species with an unpaired electron in an atomic or molecular orbital. In biological systems, the most important free radicals are superoxide anion and hydrogen peroxide; in the presence of transition metals such as iron, copper and manganese both these free radicals produce hydroxyl radicals. Free radicals attack proteins, nuclei acids and membranes containing large quantities of polyunsaturated fatty acids. Because of their toxicity, the organism has developed ways to deactivate them. The superoxide dismutase enzyme (SOD) catalyzes dismutation of the superoxide radical into hydrogen peroxide and oxygen hydrogen peroxide is in turn reduced to water and oxygen by peroxidase glutathione and catalase enzymes. The production of radicals in the brain is due to catecholamine metabolism such as dopamine and norepinephrine and is increased by the presence of transition metals and by a deficiency of antioxidant agents such as vitamin E. Two main groups of dementia exist in older age: the multi-infarctual dementias, caused by cerebrovascular disorders and the primary degenerative disorders such as Alzheimer, where no vascular disease is evident. Free radicals play an important role in Parkinson's disease, in Alzheimer's disease and in stroke. The value of SOD and CAT activity following the above mentioned degenerative diseases differ among the various studies carried out. In Alzheimer's disease, the value of SOD activity probably increases in the neuropathologically involved areas. In stroke, the SOD value does not vary either in the ischemic area or in the peri-infarctual one during the first 24 hrs after lesion, while the CAT value decreases.

Authors+Show Affiliations

Center of Clinical Chemistry, I.N.R.C.A., Scientific Institute for Hospitalization and Therapy, Fermo, Italy.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Review

Language

eng

PubMed ID

10705716

Citation

Venarucci, D, et al. "Free Radicals: Important Cause of Pathologies Refer to Ageing." Panminerva Medica, vol. 41, no. 4, 1999, pp. 335-9.
Venarucci D, Venarucci V, Vallese A, et al. Free radicals: important cause of pathologies refer to ageing. Panminerva Med. 1999;41(4):335-9.
Venarucci, D., Venarucci, V., Vallese, A., Battilà, L., Casado, A., De la Torre, R., & Lopez Fernandez, M. E. (1999). Free radicals: important cause of pathologies refer to ageing. Panminerva Medica, 41(4), 335-9.
Venarucci D, et al. Free Radicals: Important Cause of Pathologies Refer to Ageing. Panminerva Med. 1999;41(4):335-9. PubMed PMID: 10705716.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Free radicals: important cause of pathologies refer to ageing. AU - Venarucci,D, AU - Venarucci,V, AU - Vallese,A, AU - Battilà,L, AU - Casado,A, AU - De la Torre,R, AU - Lopez Fernandez,M E, PY - 2000/3/8/pubmed PY - 2000/4/15/medline PY - 2000/3/8/entrez SP - 335 EP - 9 JF - Panminerva medica JO - Panminerva Med VL - 41 IS - 4 N2 - Free radical are highly reactive chemical species with an unpaired electron in an atomic or molecular orbital. In biological systems, the most important free radicals are superoxide anion and hydrogen peroxide; in the presence of transition metals such as iron, copper and manganese both these free radicals produce hydroxyl radicals. Free radicals attack proteins, nuclei acids and membranes containing large quantities of polyunsaturated fatty acids. Because of their toxicity, the organism has developed ways to deactivate them. The superoxide dismutase enzyme (SOD) catalyzes dismutation of the superoxide radical into hydrogen peroxide and oxygen hydrogen peroxide is in turn reduced to water and oxygen by peroxidase glutathione and catalase enzymes. The production of radicals in the brain is due to catecholamine metabolism such as dopamine and norepinephrine and is increased by the presence of transition metals and by a deficiency of antioxidant agents such as vitamin E. Two main groups of dementia exist in older age: the multi-infarctual dementias, caused by cerebrovascular disorders and the primary degenerative disorders such as Alzheimer, where no vascular disease is evident. Free radicals play an important role in Parkinson's disease, in Alzheimer's disease and in stroke. The value of SOD and CAT activity following the above mentioned degenerative diseases differ among the various studies carried out. In Alzheimer's disease, the value of SOD activity probably increases in the neuropathologically involved areas. In stroke, the SOD value does not vary either in the ischemic area or in the peri-infarctual one during the first 24 hrs after lesion, while the CAT value decreases. SN - 0031-0808 UR - https://www.unboundmedicine.com/medline/citation/10705716/Free_radicals:_important_cause_of_pathologies_refer_to_ageing_ L2 - https://medlineplus.gov/olderadulthealth.html DB - PRIME DP - Unbound Medicine ER -