Profiles

Henrietta Nielsen

Biträdande lektor

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Arbetar vid Institutionen för neurokemi
Telefon 08-16 18 86
E-post henrietta.nielsen@neurochem.su.se
Besöksadress Svante Arrheniusväg 16 B
Rum C 468
Postadress Institutionen för neurokemi 106 91 Stockholm

Publikationer

I urval från Stockholms universitets publikationsdatabas
  • 2017. Henrietta M. Nielsen (et al.). Alzheimer's Research & Therapy 9

    Background

    Carriers of the APOE epsilon 4 allele are at increased risk of developing Alzheimer's disease (AD), and have been shown to have reduced cerebral metabolic rate of glucose (CMRgl) in the same brain areas frequently affected in AD. These individuals also exhibit reduced plasma levels of apolipoprotein E (apoE) attributed to a specific decrease in the apoE4 isoform as determined by quantification of individual apoE isoforms in APOE epsilon 4 heterozygotes. Whether low plasma apoE levels are associated with structural and functional brain measurements and cognitive performance remains to be investigated.

    Methods

    Using quantitative mass spectrometry we quantified the plasma levels of total apoE and the individual apoE3 and apoE4 isoforms in 128 cognitively normal APOE epsilon 3/epsilon 4 individuals included in the Arizona APOE cohort. All included individuals had undergone extensive neuropsychological testing and 25 had in addition undergone FDG-PET and MRI to determine CMRgl and regional gray matter volume (GMV).

    Results

    Our results demonstrated higher apoE4 levels in females versus males and an age-dependent increase in the apoE3 isoform levels in females only. Importantly, a higher relative ratio of apoE4 over apoE3 was associated with GMV loss in the right posterior cingulate and with reduced CMRgl bilaterally in the anterior cingulate and in the right hippocampal area. Additional exploratory analysis revealed several negative associations between total plasma apoE, individual apoE isoform levels, GMV and CMRgl predominantly in the frontal, occipital and temporal areas. Finally, our results indicated only weak associations between apoE plasma levels and cognitive performance which further appear to be affected by sex.

    Conclusions

    Our study proposes a sex-dependent and age-dependent variation in plasma apoE isoform levels and concludes that peripheral apoE levels are associated with GMV, CMRgl and possibly cognitive performance in cognitively healthy individuals with a genetic predisposition to AD.

Visa alla publikationer av Henrietta Nielsen vid Stockholms universitet

Senast uppdaterad: 16 maj 2017

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