Brazilian Green Propolis Prevents Cognitive Decline into Mild Cognitive Impairment in Elderly People Living at High Altitude

Aiqin Zhu, Zhou Wu, Xin Zhong, Junjun Ni, Yinglan Li, Jie Meng, Can Du, Xue Zhao, Hiroshi Nakanishi, Shizheng Wu

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Background: Systemic inflammation is known as a risk factor of cognitive decline. Objective: To investigate the effects of propolis on cognitive decline and systemic inflammation in elderly people living at high altitude. Methods: Sixty participants (average 72.8 years) living at altitude (2,260 meters) were randomized to receive propolis (0.83g, n=30) or placebo (n=30) for 24 months. Cognitive outcomes were assessed using MMSE and serum cytokine levels were measured for 24 months in a double-blind study. Results: MMSE scores were 26.17 at baseline and 23.87 at 24 months in placebo group. Compared to placebo group, improvements of MMSE scores were significant in propolis-treated subjects (p=0.007) with a response emerging over time (time points×group interaction, p=0.016). In addition, the serum IL-1β and IL-6 levels were significantly different across treatments (p<0.0001) showing upward and downward trends in placebo- and propolis-treated subjects, respectively (p<0.0001). Serum levels of TNF-α were not significantly different across treatment (p=0.0528) but with a response emerging over time (time points×group interaction, p=0.016). In contrast, serum levels of TGFβ1 were significantly different across treatments (p<0.0001) showing downward and upward trends in placebo- and propolis-treated subjects, respectively. Serum levels of IL-10 were significant for the effect of groups (p=0.0411). Furthermore, MMSE scores correlated with the decrease in IL-1β and the increase in TGFβ1 in serum. Conclusion: Elderly people living at high altitude developed to MCI in 24 months with exacerbation of systemic inflammation. Ingestion of propolis (>12 months) protected against cognitive decline after systemic inflammation was reduced.

Original languageEnglish
Pages (from-to)551-560
Number of pages10
JournalJournal of Alzheimer's Disease
Volume63
Issue number2
DOIs
Publication statusPublished - Jan 1 2018

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Clinical Psychology
  • Geriatrics and Gerontology
  • Psychiatry and Mental health

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