Psychopharmacology

, Volume 188, Issue 4, pp 509–520

PET imaging of cortical 11C-nicotine binding correlates with the cognitive function of attention in Alzheimer’s disease

  • Ahmadul Kadir
  • Ove Almkvist
  • Anders Wall
  • Bengt Långström
  • Agneta Nordberg
Original Investigation

DOI: 10.1007/s00213-006-0447-7

Cite this article as:
Kadir, A., Almkvist, O., Wall, A. et al. Psychopharmacology (2006) 188: 509. doi:10.1007/s00213-006-0447-7

Abstract

Rationale

Patients suffering from Alzheimer’s disease (AD) experience a marked reduction in cortical nicotinic acetylcholine receptors (nAChRs). In particular, selective loss of the α4β2 nAChR subtype was observed in postmortem AD brain tissue. The α4 and α7 nAChR subunits were suggested to play an important role in cognitive function. Positron emission tomography (PET) has so far been used to visualize neuronal nAChRs in vivo by 11C-nicotine binding.

Objectives

To investigate the relationship between measures of cognitive function and in vivo 11C-nicotine binding in mild AD brain as assessed by PET.

Materials and methods

Twenty-seven patients with mild AD were recruited in this study. A dual tracer model with administration of 15O-water for regional cerebral blood flow and (S)(−)11C-nicotine was used to assess nicotine binding sites in the brain by PET. Cognitive function was assessed using neuropsychological tests of global cognition, episodic memory, attention, and visuospatial ability.

Results

Mean cortical 11C-nicotine binding significantly correlated with the results of attention tests [Digit Symbol test (r=−0.44 and p=0.02) and Trail Making Test A (TMT-A) (r=0.42 and p=0.03)]. No significant correlation was observed between 11C-nicotine binding and the results of tests of episodic memory or visuospatial ability. Regional analysis showed that 11C-nicotine binding in the frontal and parietal cortex, which are the main areas for attention, correlated significantly with the Digit Symbol test and TMT-A results.

Conclusion

Cortical nicotinic receptors in vivo in mild AD patients are robustly associated with the cognitive function of attention.

Keywords

Alzheimer’s disease (AD)Nicotinic acetylcholine receptors (nAChRs)Positron emission tomography (PET)11C-nicotine bindingCognitionAttention

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Ahmadul Kadir
    • 1
  • Ove Almkvist
    • 2
    • 3
    • 4
  • Anders Wall
    • 5
  • Bengt Långström
    • 5
  • Agneta Nordberg
    • 1
    • 3
  1. 1.Department of Neurobiology, Care Sciences and Society, Division of Molecular NeuropharmacologyKarolinska Institutet, Karolinska University Hospital HuddingeStockholmSweden
  2. 2.Department of Neurobiology, Care Sciences and SocietyKarolinska Institutet, Karolinska University Hospital HuddingeStockholmSweden
  3. 3.Department of Geriatric MedicineKarolinska University Hospital HuddingeStockholmSweden
  4. 4.Department of PsychologyStockholm UniversityStockholmSweden
  5. 5.Uppsala ImanetUppsalaSweden