Saturday, March 12, 2022

Higher baseline inflammatory marker levels predict 10-year cognitive decline in type 2 diabetes

The study included 1,066 adults aged 60 to 75 years with type 2 diabetes.

The researchers measured C-reactive protein, interleukin-6, tumour necrosis factor-alpha and fibrinogen.

Data indicated that higher interleukin-6 was associated with a greater decline in tests of executive function and abstract reasoning.

 According to a study, higher baseline levels of systemic inflammatory markers, including plasma interleukin-6 and fibrinogen, were associated with a greater cognitive decline for adults with type 2 diabetes for 10 years. "At least some of this association appeared to be specific to certain cognitive domains and to be independent of vascular and diabetes-related risk factors," Anniek J Sluiman, PhD, a senior population health researcher at the University of Edinburgh, UK, and colleagues wrote in Diabetologia.

For the prospective Edinburgh type 2 diabetes study, Sluiman and colleagues sought to assess the longitudinal association of circulating markers of systemic inflammation with subsequent long-term cognitive change in older people with type 2 diabetes.

The study included 1,066 adults aged 60 to 75 years with type 2 diabetes. At baseline, the researchers measured Researchers, interleukin-6, tumour necrosis factor-alpha and fibrinogen, and performed neuropsychological testing on major cognitive domains. They repeated cognitive testing at 10 years for 581 participants and determined a general cognitive ability score via the battery of seven individual cognitive tests using principal component analysis.

After adjusting for age, sex and baseline general cognitive ability, researchers observed an association between higher baseline levels of fibrinogen and interleukin-6, a greater decline in general cognitive ability. However, these associations no longer proved statistically significant after adjustment for baseline vascular and diabetes-related covariables.

In addition, data indicated that higher interleukin-6 was associated with a greater decline in tests of executive function and abstract reasoning, whereas raised levels of fibrinogen and C-reactive protein were associated with a greater decline in processing speed. The statistical significance remained after adjustment for diabetes- and vascular-related risk factors, according to the researchers.

"Our results go some way to addressing the previous paucity of evidence of a prospective association between markers of systemic inflammation and cognitive decline in people with type 2 diabetes," researchers wrote. "As this is primarily an exploratory observational study, clinical implications are limited and indirect," they added.

If future investigation proves the pathophysiological association causal, they wrote, "The possibility arises that efforts taken to reduce overall systemic inflammation may be beneficial in preventing the onset and severity of cognitive decline in people with type 2 diabetes. In addition, even if the findings do not translate into direct impact on therapeutic pathways, they could potentially help identify higher-risk groups within the diabetes population and so impact on clinical guidelines and decision-making."

 

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