Prenatal lead levels, plasma amyloid β levels, and gene expression in young adulthood.

Abstract:

BACKGROUND:Animal studies suggest that early-life lead exposure influences gene expression and production of proteins associated with Alzheimer's disease (AD). OBJECTIVES:We attempted to assess the relationship between early-life lead exposure and potential biomarkers for AD among young men and women. We also attempted to assess whether early-life lead exposure was associated with changes in expression of AD-related genes. METHODS:We used sandwich enzyme-linked immunosorbent assays (ELISA) to measure plasma concentrations of amyloid β proteins Aβ40 and Aβ42 among 55 adults who had participated as newborns and young children in a prospective cohort study of the effects of lead exposure on development. We used RNA microarray techniques to analyze gene expression. RESULTS:Mean plasma Aβ42 concentrations were lower among 13 participants with high umbilical cord blood lead concentrations (≥ 10 μg/dL) than in 42 participants with lower cord blood lead concentrations (p = 0.08). Among 10 participants with high prenatal lead exposure, we found evidence of an inverse relationship between umbilical cord lead concentration and expression of ADAM metallopeptidase domain 9 (ADAM9), reticulon 4 (RTN4), and low-density lipoprotein receptor-related protein associated protein 1 (LRPAP1) genes, whose products are believed to affect Aβ production and deposition. Gene network analysis suggested enrichment in gene sets involved in nerve growth and general cell development. CONCLUSIONS:Data from our exploratory study suggest that prenatal lead exposure may influence Aβ-related biological pathways that have been implicated in AD onset. Gene network analysis identified further candidates to study the mechanisms of developmental lead neurotoxicity.

authors

Mazumdar M,Xia W,Hofmann O,Gregas M,Ho Sui S,Hide W,Yang T,Needleman HL,Bellinger DC

doi

10.1289/ehp.1104474

subject

Has Abstract

pub_date

2012-05-01 00:00:00

pages

702-7

issue

5

eissn

0091-6765

issn

1552-9924

journal_volume

120

pub_type

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