کسانی که در طول زندگی مغز خود را با کنش های شناختی مانند خواندن، نوشتن، و انجام بازی ها [ی فکری] فعال نگاه می دارند به نظر می رسد که میزان کمتری از پروتیین آمیلوید-بتا، که بخش عمده جرم آمیلوید در بیماری آلزایمر را تشکیل می دهد، انباشت می کنند.
بر پایه مطالعه ای که بار نخست به صورت آنلاین در "ارکایوز اف نورولوژی" [آرشیو عصب شناسی]، یک نشریه علمی جاما/آرکایوز، انتشار یافت، ساخت به تازگی رادیوفارماسوتیکال کربن 11، که ترکیب بی. پیتزبرگ ([ 11 C]PiB) عنوان گرفت، به پژوهشگران امکان داد تا شکل های فیبری/فیبریلار آمیلوید-بتا (Aβ) را تصویربرداری نمایند.
سوزان ام. لاودن، از دانشگاه کالیفرنا در برکلی و عضو آزمایشگاه ملی لورنس برکلی، دارنده درجه دکترا، و همکارانش آزمایش [11 C]PiB PET و عصب-روانشناسانه را بر روی نمونه ای از شرکت کنندگان سالمند از نظر شناختی عادی انجام دادند. پژوهشگران Aβ را به عنوان غشای میانگین درک آزمون [11 C]PiB PET تعریف کردند. آنها 65 سالمند سالم، با میانیگین سنی 1/76 سال، را مورد بررسی قرار دادند و نتایج آنها را با نتایج 11 شرکت کننده جوان، با میانگین سنی 5/24 سال، و 10 بیمار مبتلا به آلزایمر با میانگین سنی 8/74 سال مقایسه نمودند. پژوهشگران همه شرکت کنندگان را از جهت رفتار و شیوه های گوناگون زندگی، شامل تناوب شرکت در فعالیت های شناختی در مراحل مختلف زندگی شان، از شش سالگی تاکنون، مورد کند و کاو قرار دادند.
این پژوهشگران نوشتند: "ما گزارش می دهیم که میان فعالیت های شناختی و [11 C]PiB PET رابطه مستقیمی وجود دارد، که چنین القا می کند که عوامل شیوه های زندگی در کسانی که درگیر فعالیت های شناختی بالایی هستند ممکن است مانع و یا کاهش دهنده انباشت آمیلوید-بتا بوده، و شاید بر نقطه آغاز رشد بیماری آلزایمر تاثیر می گذارد." [ادامه در زیر ...]
Stimulating Cognitive Activity Lowers Risk of Alzheimer's
Medical News Today | 26 Jan 2012
Findings published Online First by Archives of Neurology, a JAMA/Archives journal, show that people who keep their brain active throughout their lives with cognitively stimulating activities like reading, writing and playing games seem to have lower levels of the β-amyloid protein, which is the major part of the amyloid plaque in Alzheimer disease.
The recently developed radiopharmaceutical carbon 11-labeled Pittsburgh Compound B ([ 11 C]PiB), has enabled researchers to image fibrillar (fiber) forms of the β-amyloid (Aβ) protein.
Susan M. Landau, Ph.D., at the University of California in Berkeley and the Lawrence Berkeley National Laboratory, and her team performed [ 11 C]PiB PET (positron emission tomography) and neuropsychological testing in a sample of cognitively normal older participants. The researchers defined Aβ as average cortical [ 11 C]PiB PET uptake. They assessed 65 healthy elderly people, with an average age of 76.1 years, and compared them with 11 young participants, with an average age of 24.5 years, and 10 patients with Alzheimer disease (AD) aged on average 74.8 years. The researchers surveyed all participants in terms of their different lifestyle practices, including the frequency in which they participated in cognitively engaging activities at different phases throughout their life, starting from the age of 6 years to their current age.
They write: "We report a direct association between cognitive activity and [ 11 C]PiB uptake, suggesting that lifestyle factors found in individuals with high cognitive engagement may prevent or slow deposition of β-amyloid, perhaps influencing the onset and progression of AD."
According to the findings, a greater participation in cognitively stimulating activities throughout a person's life, particularly in early and middle life, seems to be linked to reduced [ 11 C]PiB uptake. The researchers noted that the [ 11 C]PiB uptake was similar between elderly individuals with the highest cognitive activity and young people in the control group, whilst those with the lowest cognitive activity had [ 11 C]PiB uptake similar to AD patients.
The researchers note that even though a greater cognitive activity was linked to more physical exercise, it was not linked to [ 11 C]PiB uptake. They indicate that the likelihood of engaging in cognitively stimulating activities tends to be linked to various lifestyle practices, which have been implicated in other studies with a decreased risk of AD-related pathology.
The researchers conclude: "It is unlikely that our results reflect a single unitary cause of AD, which is a complex disease with many potential pathogenetic processes. Furthermore, cognitive activity is just one component of a complex set of lifestyle practices linked to AD risk that may be examined in future work. However, the present findings extend previous findings that link cognitive stimulation and AD risk (an indirect downstream effect of Aβ) by providing evidence that is consistent with a model in which cognitive stimulation is linked directly to the AD-related pathology itself."
Written Petra Rattue
Copyright: Medical News Today
References:
Arch Neurol. Published online January 23, 2012. doi:10.1001/archneurol.2011.2748.