Neurobiology of Aging | September 4, 2021
van den Bosch KA, Verberk IMW, Ebenau JL, van der Lee SJ, Jansen IE, Prins ND, Scheltens P, Teunissen CE and Van der Flier WM
Neurobiology of Aging. 2021
https://doi.org/10.1016/j.neurobiolaging.2021.08.018
Brain-derived neurotrophic factor (BNDF) plays a role in synapse integrity. We investigated in 398 cognitively normal adults (60±8y, 41%F, MMSE=28±1) the joint association of the Val66Met polymorphism of the BDNF gene (Met+/-) and plasma BDNF levels and abnormal CSF amyloid-beta (A+/-) with cognitive decline and dementia risk. Age-, sex- and education-adjusted linear mixed models showed that compared to Met-A-, Met+A+ showed steeper decline on tests of global cognition, memory, language, attention and executive functioning, while Met-A+ showed steeper decline on a smaller number of tests. There were no associations between Met+A- and cognitive decline. Cox models showed that compared to Met-A-, Met+A+ participants were at increased risk of dementia (HR=8.8, 95%CI: 2.8–27.9), as was Met-A+ (HR=6.5, 95%CI: 2.2–19.5). Lower plasma BDNF was associated with an increased risk of progression to dementia in the A+ participants. Our results imply that Met-carriage on top of amyloid-beta pathology might increase rate of cognitive decline to dementia.
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