Nevada desert dust with heavy metals suppresses IgM antibody production
Keil, Deborah E; Buck, Brenda; Goossens, Dirk; McLaurin, Brett; Murphy, Lacey; Leetham-Spencer, Mallory; Teng, Yuanxin; Pollard, James; Gerads, Russell; DeWitt, Jamie C.
Systemic health effects from exposure to a complex natural dust containing heavy metals from the Nellis Dunes Recreation Area (NDRA) near Las Vegas, NV, were evaluated. Several toxicological parameters were examined following lung exposure to emissive dust from three geologic sediment types heavily used for recreational off- road activities: yellow sand very rich in arsenic (termed CBN 5); a shallow cover of loose dune sand overlying a gravelly subsoil bordering dune fields (termed CBN 6); and brown claystone and siltstone (termed CBN 7). Adult female B6C3F1 mice were exposed by oropharyngeal administration to these three types of geogenic dusts at 0.01–100 mg of dust/kg of body weight, once per week for four weeks. The median grain sizes were 4.6, 3.1, and 4.4 μm, for CBN 5, 6, and 7, respectively. Each type of dust contained quantifiable amounts of aluminum, vanadium, chromium, manganese, iron, cobalt, copper, zinc, arsenic, strontium, cesium, lead, uranium, and others. Descriptive markers of immunotoxicity, neurotoxicity, hematology, and clinical chemistry parameters were assessed. Notable among all three CBN units was a systemic, dose-responsive decrease in antigen-specific IgM antibody responses. Geogenic dust from CBN 5 produced more than a 70% suppression in IgM responses, establishing a lowest adverse effect level (LOAEL) of 0.01 mg/kg. A suppression in IgM responses and a corre- sponding increase in serum creatinine determined a LOAEL of 0.01 mg/kg for CBN 6. The LOAEL for CBN 7 was 0.1 mg/kg and also was identified from suppression in IgM responses. These results are of concern given the frequent off-road vehicle traffic and high visitor rates at the NDRA, estimated at 300,000 each year.
Keil, Deborah E, & Buck, Brenda, & Goossens, Dirk, & McLaurin, Brett, & Murphy, Lacey, & Leetham-Spencer, Mallory, & Teng, Yuanxin, & Pollard, James, & Gerads, Russell, & DeWitt, Jamie C.. (February 2018). Nevada desert dust with heavy metals suppresses IgM antibody production. Toxicology Reports, (258-269. Retrieved from http://hdl.handle.net/10342/7699
Keil, Deborah E, and Buck, Brenda, and Goossens, Dirk, and McLaurin, Brett, and Murphy, Lacey, and Leetham-Spencer, Mallory, and Teng, Yuanxin, and Pollard, James, and Gerads, Russell, and DeWitt, Jamie C.. "Nevada desert dust with heavy metals suppresses IgM antibody production". Toxicology Reports. . (258-269.), February 2018. October 24, 2020. http://hdl.handle.net/10342/7699.
Keil, Deborah E and Buck, Brenda and Goossens, Dirk and McLaurin, Brett and Murphy, Lacey and Leetham-Spencer, Mallory and Teng, Yuanxin and Pollard, James and Gerads, Russell and DeWitt, Jamie C., "Nevada desert dust with heavy metals suppresses IgM antibody production," Toxicology Reports 5, no. (February 2018), http://hdl.handle.net/10342/7699 (accessed October 24, 2020).
Keil, Deborah E, Buck, Brenda, Goossens, Dirk, McLaurin, Brett, Murphy, Lacey, Leetham-Spencer, Mallory, Teng, Yuanxin, Pollard, James, Gerads, Russell, DeWitt, Jamie C.. Nevada desert dust with heavy metals suppresses IgM antibody production. Toxicology Reports. February 2018; 5() 258-269. http://hdl.handle.net/10342/7699. Accessed October 24, 2020.