13.02.2013 Views

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

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

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

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

AX5-114<br />

Table AX5-7.2. <strong>Lead</strong> and Free Radicals<br />

Author Animal Species <strong>Lead</strong> Dosage Blood <strong>Lead</strong> Findings<br />

Pereira et al.<br />

(1992)<br />

Somashekaraiah<br />

et al. (1992)<br />

Bondy and Guo<br />

(1996)<br />

Blazka et al.<br />

(1994)<br />

Quinn and Harris<br />

(1995)<br />

Rats ALA-treated (40 mg/kg every<br />

2 days <strong>for</strong> 15 days)<br />

Chick embryos 1.25 and 2.5 momol/kg <strong>of</strong> Pb acetate<br />

Sprague-Dawley<br />

rat cerebral<br />

synaptosomes<br />

Mouse brain<br />

microvascular<br />

endothelial cell<br />

culture<br />

Rat cerebellum<br />

homogenates<br />

0.5 mM Pb acetate<br />

10, 100, and 1,000 nM Pb acetate<br />

17–80 nM Pb nitrate<br />

Ercal et al. (1996) C57BL/6 mice 1300 ppm Pb acetate <strong>for</strong> 5 wks,<br />

Nac, 5.5 mmol/kg, or DMSA,<br />

1 mmol/kg, given in 6th week.<br />

Vaziri and coworkers<br />

(1997–<br />

2004)<br />

Farmand et al.<br />

(2005)<br />

Gurer et al.<br />

(1999)<br />

Sprague-Dawley<br />

rats<br />

Sprague-Dawley<br />

rats<br />

—<br />

—<br />

—<br />

—<br />

—<br />

36.5 µg/dL in Pb-treated;<br />

13.7 µg/dL in Pb +<br />

DMSA-treated<br />

Fatigued earlier than controls.<br />

Increase <strong>of</strong> CuZn SOD in brain, muscle and liver.<br />

See Section 5.5 <strong>for</strong> details Variable See Section 5.5 <strong>for</strong> details.<br />

100 ppm Pb acetate <strong>for</strong> 3 mo<br />

Fischer 344 rats 1100 ppm Pb acetate <strong>for</strong> 5 wks,<br />

Captopril <strong>for</strong> 6th wk<br />

—<br />

24.6µg/dL in Pb-treated.<br />

23.8 µg/dL in Pb +<br />

Captopril-treated<br />

Lipoperoxides maximal at 9 hrs and returned to normal at<br />

72 hrs.<br />

GSH depleted. GST, SOD and catalase increased in liver,<br />

brain and heart at 72 hrs.<br />

Generation <strong>of</strong> ROS not increased by Pb alone but increased<br />

when 50 µM iron sulfate added.<br />

Constitutive production <strong>of</strong> nitrite, but not inducible, decreased<br />

by Pb. Extracellular calcium abolishes this effect.<br />

Constitutive NOS activity inhibited 50% by 17 nM Pb and<br />

100% by 80 nM Pb. Reversed by increasing Ca concentration.<br />

Liver and brain GSH depleted by Pb and MDA increased.<br />

Both were restored by either DMSA or NAC. However,<br />

DMSA reduced blood, liver, and brain Pb levels while NAC<br />

did not.<br />

CuZnSOD activity increased in kidney. CuZnSOD activity<br />

increased in aorta whereas protein abundance unchanged.<br />

Guanylate cyclase protein abundance in aorta decreased.<br />

MDA in liver, brain, and kidney increased by Pb. GSH<br />

decreased. Captopril reversed these findings.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!