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Table 5 Relative mRNA level for oxidative stress-related proteins to β-actin

From: Role of Nrf2 in inflammatory response in lung of mice exposed to zinc oxide nanoparticles

  

Amount of ZnO-NPs administered (μg)

Simple regression

Multiple regression

Genotype

0

10

30

Effect of ZnO-NPs

Interaction of ZnO-NPs and Nrf2 deletion

Effect of ZnO-NPs

Effect of Nrf2 deletion

SOD1

Wild type

Nrf2−/−

1.5 ± 0.4

1.02 ± 0.3

1.8 ± 0.7

1.5 ± 0.3*

2.3 ± 0.9

1.2 ± 0.3

0.025(p = 0.027)

0.0023 (p = 0.68)

−0.011

(p = 0.083)

0.014(p = 0.028)

−0.31(p = 0.0003)

CAT

Wild type

Nrf2−/−

2.4 ± 0.5

2.6 ± 0.7

1.9 ± 0.7

2.7 ± 1.0

3.2 ± 1.5(p = 0.042)

2.3 ± 0.8

0.030 (p = 0.063)

−0.011 (p = 0.45)

−0.02

(p = 0.06)

0.012 (p = 0.28)

0.011 (p = 0.94)

GcLc

Wild type

Nrf2−/−

1.6 ± 0.5

1.3 ± 0.4

1.4 ± 0.4

1.6 ± 0.5

1.9 ± 0.9

1.1 ± 0.2

0.011(p = 0.25)

−0.011 (p = 0.14)

−0.011

(p = 0.082)

0.0016(p = 0.80)

−0.17(p = 0.032)

GcLm

Wild type

Nrf2−/−

1.5 ± 0.6

1.3 ± 0.3

1.1 ± 0.3

1.3 ± 0.2

1.3 ± 0.5

1.0 ± 0.3

−0.0033 (p = 0.65)

− 0.0095 (p = 0.48)

−0.0031

(p = 0.50)

− 0.0061 (p = 0.18)

−0.057(p = 0.32)

NQO1

Wild type

Nrf2−/−

0.9 ± 0.5

0.7 ± 0.1

0.9 ± 0.8

0.9 ± 0.3

0.9 ± 0.8

0.6 ± 0.1

−0.00095 (p = 0.93)

− 0.0045 (p = 0.23)

−0.0018 (p = 0.77)

− 0.0025 (p = 0.67)

−0.064(p = 0.39)

GR

Wild type

Nrf2−/−

1.3 ± 0.7

2.1 ± 0.5

0.9 ± 0.3

1.8 ± 0.5

4.6 ± 6.7

1.7 ± 0.7

0.12(p = 0.040)

−0.011 (p = 0.24)

−0.067

(p = 0.043)

–

–

HO-1

Wild type

Nrf2−/−

7.5 ± 3.0

5.8 ± 2.5

7.1 ± 2.3

3.8 ± 1.6

6.8 ± 1.9

4.2 ± 1.7

−0.023 (p = 0.53)

− 0.042 (p = 0.22)

0.0095 (p = 0.70)

− 0.031 (p = 0.21)

−1.25(p = 0.0002)

MT-1

Wild type

Nrf2−/−

1.5 ± 0.9

1.9 ± 1.1

1.4 ± 0.6

2.2 ± 0.6

3.8 ± 2.5*

2.6 ± 0.9

0.081(p = 0.0017)

−0.0033 (p = 0.83)

−0.042

(p = 0.0063)

–

–

MT-2

Wild type

Nrf2−/−

1.9 ± 0.7

3.7 ± 1.6

1.9 ± 0.8

3.8 ± 1.4

3.9 ± 2.0*

4.1 ± 2.5

0.072 (p = 0.001)

0.013(p = 0.66)

−0.029

(p = 0.097)

0.046 (p = 0.012)

0.68(p = 0.0035)

  1. Mean ± SD. * p < 0.05compared to the corresponding genotype control by Dunnett’s multiple comparison following ANOVA. Simple regression analysis in each genotype and multiple regression analysis in a model with interaction was conducted. As the interaction was not significant for SOD1, CAT, GcLc, GcLm, NQO1, HO-1 or MT-2, multiple regression in a model without interaction was finally conducted to estimate effect of ZnO-NPs or Nrf2 deletion