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The paper summarizes literature data on the importance of oxidative stress as one of the pathogenetic mechanisms in Alzheimer's disease. The paper describes the main specific and nonspecific ways of reactive oxygen species generation in the course of the disease development. The effect of reactive oxygen species generated by the functional activity of cells, i.e. apoptosis and mitotic cycle, is shown. The role of the regulatory system of nodal cells is performed by phosphorylation/dephosphorylation process which is associated with intense phosphorylation of tau protein and mitosis-specific proteins. In Alzheimer's disease, the regulating function of peptidyl-prolyl isomerases in particular of Pin1 associated with maintaining a balanced state of phosphorylation/dephosphorylation processes is disturbed. Taking into consideration the multifactorial impairment of the cell cycle control, this process should be considered from the standpoint of the general state of metabolic processes, and oxidative stress has one of the key positions in aging.Obobshcheny literaturnye dannye o znachimosti okislitel'nogo stressa v kachestve odnogo iz patogeneticheskikh zven'ev bolezni Al'tsgeĭmera. Otrazheny osnovnye spetsificheskie i nespetsificheskie puti generatsii aktivnykh form kisloroda pri razvitii bolezni. Pokazano vliianie generiruemykh aktivnykh form kisloroda na funktsional'nuiu aktivnost' kletok – apoptoz i mitoticheskiĭ tsikl. Rol' uzlovoĭ reguliatornoĭ sistemy kletok pri étom vypolniaiut protsessy fosforilirovaniia/defosforilirovaniia, chto sopriazheno s intensivnym fosforilirovaniem belka tau, belkov, uchastvuiushchikh v mitoze. Pri bolezni Al'tsgeĭmera narushaetsia reguliruiushchaia funktsiia peptidil-prolilizomeraz, v chastnosti, Pin1, sviazannaia s podderzhaniem sbalansirovannogo sostoianiia protsessov fosforilirovaniia/defosforilirovaniia. Uchityvaia mnogofaktornost' narusheniia kontrolia kletochnogo tsikla, sleduet rassmatrivat' étot protsessa s pozitsiĭ obshchego sostoianiia metabolicheskikh protsessov, odnu iz kliuchevykh pozitsiĭ kotorykh pri starenii organizma zanimaet okislitel'nyĭ stress.