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Air Quality Criteria for Lead Volume II of II - (NEPIS)(EPA) - US ...

Air Quality Criteria for Lead Volume II of II - (NEPIS)(EPA) - US ...

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AX5-9<br />

Table AX5-2.3. <strong>Lead</strong> Binding and Transport in Human Erythrocytes<br />

Dose and Route <strong>of</strong><br />

Exposure Duration Species Blood lead Effect Authors<br />

0–60 pM Pb ion,<br />

In vitro<br />

Zn—Zinc<br />

20 min Human erythrocyte lysates — Human erythrocyte lysate porphobilinogen activity is increased by Zn 2+<br />

with a Km <strong>of</strong> 1.6 pM and inhibited by Pb with a Ki <strong>of</strong> 0.07 pM, Pb<br />

reduced the affinity <strong>for</strong> the substrate 5- aminolevulinate, non-<br />

competitively.<br />

Simons (1995)

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