TY - JOUR
T1 - Fluoride exposure is associated with altered metabolism of arsenic in an adult Mexican population
AU - Jiménez-Córdova, Mónica I.
AU - Sánchez-Peña, Luz C.
AU - Barrera-Hernández, Ángel
AU - González-Horta, Carmen
AU - Barbier, Olivier C.
AU - Del Razo, Luz M.
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/9/20
Y1 - 2019/9/20
N2 - Arsenic (As)and fluoride (F)are two common groundwater toxicants. The toxicity of As is closely related to As metabolism, and several biological and environmental factors have been associated with As modification. However, limited information about the effect of F exposure on the modification of the As metabolism profile has been described. The aim of this study was to assess the interaction effect of As[sbnd]F coexposure on the As metabolism profile in an adult population environmentally exposed to low-moderate As levels. A cross-sectional study was conducted in 236 adults from three Mexican communities. F and As concentrations were quantified in water samples. The concentrations of urinary F and As species [inorganic arsenic (iAs), monomethylated arsenic (MAs)and dimethylated arsenic (DMAs)]were also determined and used as exposure biomarkers. As species percentages and methylation indices were estimated to evaluate the As methylation profile. Our results showed a relationship between the water and urine concentrations of both contaminants and, a significant correlation between the As and F concentrations in water and urine samples. A statistically significant interaction of F and As exposure on the increase in MAs% (β = 0.16, p = 0.018)and the decrease in DMAs% (β = −0.3, p = 0.034), PMI (β = −0.07, p = 0.052)and SMI (β = −0.13, p = 0.097)was observed. These findings indicate that drinking water is the main source of As[sbnd]F coexposure and suggest that F exposure decreases As methylation capacity. However, additional large and prospective studies are required to confirm our findings, and to elucidate the involved mechanisms of interaction and their implications in adverse health effects.
AB - Arsenic (As)and fluoride (F)are two common groundwater toxicants. The toxicity of As is closely related to As metabolism, and several biological and environmental factors have been associated with As modification. However, limited information about the effect of F exposure on the modification of the As metabolism profile has been described. The aim of this study was to assess the interaction effect of As[sbnd]F coexposure on the As metabolism profile in an adult population environmentally exposed to low-moderate As levels. A cross-sectional study was conducted in 236 adults from three Mexican communities. F and As concentrations were quantified in water samples. The concentrations of urinary F and As species [inorganic arsenic (iAs), monomethylated arsenic (MAs)and dimethylated arsenic (DMAs)]were also determined and used as exposure biomarkers. As species percentages and methylation indices were estimated to evaluate the As methylation profile. Our results showed a relationship between the water and urine concentrations of both contaminants and, a significant correlation between the As and F concentrations in water and urine samples. A statistically significant interaction of F and As exposure on the increase in MAs% (β = 0.16, p = 0.018)and the decrease in DMAs% (β = −0.3, p = 0.034), PMI (β = −0.07, p = 0.052)and SMI (β = −0.13, p = 0.097)was observed. These findings indicate that drinking water is the main source of As[sbnd]F coexposure and suggest that F exposure decreases As methylation capacity. However, additional large and prospective studies are required to confirm our findings, and to elucidate the involved mechanisms of interaction and their implications in adverse health effects.
KW - Arsenic metabolism
KW - Chihuahua
KW - Contaminated water
KW - Fluoride-arsenic coexposure
KW - Interaction effect
KW - Urine
UR - http://www.scopus.com/inward/record.url?scp=85066298299&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2019.05.356
DO - 10.1016/j.scitotenv.2019.05.356
M3 - Artículo
C2 - 31158625
AN - SCOPUS:85066298299
SN - 0048-9697
VL - 684
SP - 621
EP - 628
JO - Science of the Total Environment
JF - Science of the Total Environment
ER -