Particulate Matter in Pollution Exacerbates Environmental Illness via the Nrf2 Pathway!

In the past, I have made several post on particulate matter and how pollution may negatively influence the main environmental illnesses chronic fatigue syndrome, fibromyalgia and multiple chemical sensitivity. It is believe that what these conditions have in common is higher than normal oxidative stress and higher levels of inflammation. In addition, I believe that deficiencies in the Nrf2 pathway may exacerbate the conditions.

Through the discoveries from a study on dendritic cells, more has been learned about how Nrf2 and particulate matter interact to lessen or contribute to disease. Dendritic cells are an important part of the antigen-presenting immune system. The author writes that exposure to particulate matter in an Nrf2 deficient environment leads to 1) impairment of antigen endocytosis 2) significantly higher levels of oxidative stress probably due to lower levels of antioxidants like GCL and HO-1 3) higher levels of inflammatory cytokines including TNF-a and Il-6 4) lower levels of Il-18 4) less sensitivity to NAC and 5) Nrf2 deficiency may influence Th2 cytokine development leading to allergic diseases. (1)

This study provides clues to how particulate matter may influence the development of higher than normal levels of oxidative stress. People with conditions that already have conditions where these levels are higher should be aware that exposure to pollution indoors and outdoors may make their symptoms worse. In addition, we previously have written that many things can cause deficiency in the Nrf2 antioxidant pathway. This includes genetic factors, direct chemical exposure, changes to the microbiome and high fat diets.


1. Disruption of the transcription factor Nrf2 promotes pro-oxidative dendritic cells that stimulate Th2-like immunoresponsiveness upon activation by ambient particulate matter. Journal of immunology (Baltimore, Md. : 1950), Vol. 181, No. 7. (01 October 2008), pp. 4545-4559 by Marc A. Williams, Tirumalai Rangasamy, Stephen M. Bauer, et al.