Sex-specific modulation of amyloid-β on tau phosphorylation underlies faster tangle accumulation in females
Yi‐Ting Wang, Joseph Therriault, Stijn Servaes, Cécile Tissot, Nesrine Rahmouni, Arthur C. Macedo, Jaime Fernández Arias, Sulantha Mathotaarachchi, Andréa Lessa Benedet, Jenna Stevenson, Nicholas J. Ashton, Firoza Z Lussier, Tharick A. Pascoal, Henrik Zetterberg, Maria Natasha Rajah, Kaj Blennow, Serge Gauthier, Pedro Rosa‐Neto, for the Alzheimer’s Disease Neuroimaging Initiative, Michael W Weiner, Paul Aisen, Michael W Weiner, Paul Aisen, Ronald Petersen, Clifford R Jack, William J. Jagust, John Q. Trojanowki, Arthur W Toga, Laurel Beckett, Robert C. Green, Andrew J Saykin, John C. Morris, Richard J Perrin, Leslie M. Shaw, Zaven S. Khachaturian, Maria Carrillo, William Z. Potter, Lisa L. Barnes, Marie Bernard, John K Hsiao, Jonathan Jackson, Eliezer Masliah, Donna Masterman, Ozioma C. Okonkwo, Richard J. Perrin, Laurie Ryan, Nina Silverberg, Adam Fleisher, Michael W Weiner, Diana Truran Sacrey, Juliet Fockler, Cat Conti, Dallas P. Veitch, John Neuhaus, Chengshi Jin, Rachel L. Nosheny, Miriam T. Ashford, Derek Flenniken, Adrienne Kormos, Robert C Green, Tom Montine, Cat Conti, Ronald Petersen, Paul Aisen, Michael S. Rafii, Rema Raman, Gustavo Jiménez, Michael Donohue, Devon Gessert, Jennifer Salazar, Caileigh Zimmerman, Yuliana Cabrera, Sarah Walter, Garrett Miller, Godfrey Coker, Taylor Clanton, Lindsey Hergesheimer, Stephanie Smith, Olusegun Adegoke, Payam Mahboubi, Shelley Moore, Jeremy Pizzola, Elizabeth Shaffer, Brittany Sloan, Laurel Beckett, Danielle Harvey, Michael Donohue, Clifford R Jack, Arvin Forghanian-Arani, Bret Borowski, Chad Ward, Christopher G. Schwarz, David Jones, Jeff Gunter, Kejal Kantarci, Matthew L. Senjem, Prashanthi Vemuri, Robert I. Reid, Nick C. Fox, Ian B. Malone
Abstract
Females are disproportionately affected by dementia due to Alzheimer's disease. Despite a similar amyloid-β (Aβ) load, a higher load of neurofibrillary tangles (NFTs) is seen in females than males. Previous literature has proposed that Aβ and phosphorylated-tau (p-tau) synergism accelerates tau tangle formation, yet the effect of biological sex in this process has been overlooked. In this observational study, we examined longitudinal neuroimaging data from the TRIAD and ADNI cohorts from Canada and USA, respectively. We assessed 457 participants across the clinical spectrum of Alzheimer's disease. All participants underwent baseline multimodal imaging assessment, including MRI and PET, with radioligands targeting Aβ plaques and tau tangles, respectively. CSF data were also collected. Follow-up imaging assessments were conducted at 1- and 2-year intervals for the TRIAD cohort and 1-, 2- and 4-year intervals for the ADNI cohort. The upstream pathological events contributing to faster tau progression in females were investigated-specifically, whether the contribution of Aβ and p-tau synergism to accelerated tau tangle formation is modulated by biological sex. We hypothesized that cortical Aβ predisposes tau phosphorylation and tangle accumulation in a sex-specific manner. Findings revealed that Aβ-positive females presented higher CSF p-tau181 concentrations compared with Aβ-positive males in both the TRIAD (P = 0.04, Cohen's d = 0.51) and ADNI (P = 0.027, Cohen's d = 0.41) cohorts. In addition, Aβ-positive females presented faster NFT accumulation compared with their male counterparts (TRIAD: P = 0.026, Cohen's d = 0.52; ADNI: P = 0.049, Cohen's d = 1.14). Finally, the triple interaction between female sex, Aβ and CSF p-tau181 was revealed as a significant predictor of accelerated tau accumulation at the 2-year follow-up visit (Braak I: P = 0.0067, t = 2.81; Braak III: P = 0.017, t = 2.45; Braak IV: P = 0.002, t = 3.17; Braak V: P = 0.006, t = 2.88; Braak VI: P = 0.0049, t = 2.93). Overall, we report sex-specific modulation of cortical Aβ in tau phosphorylation, consequently facilitating faster NFT progression in female individuals over time. This presents important clinical implications and suggests that early intervention that targets Aβ plaques and tau phosphorylation may be a promising therapeutic strategy in females to prevent the further accumulation and spread of tau aggregates.