Table 4 Comparative biodistribution of 99mTc-labeled G3 variants in BALB/C nu/nu mice bearing SKOV3 xenografts at 4 and 24 h pi.

From: Optimal composition and position of histidine-containing tags improves biodistribution of 99mTc-labeled DARPin G3

 

[99mTc]Tc(CO)3-H6-G3

[99mTc]Tc(CO)3-G3-H6

[99mTc]Tc(CO)3-(HE)3-G3

[99mTc]Tc(CO)3-G3-(HE)3

4h

Blood

0.19 ± 0.06c

0.14 ± 0.03e

0.18 ± 0.03f

0.36 ± 0.07

Salivary glands

1.9 ± 0.2c

1.5 ± 0.2

0.7 ± 0.2b,d

1. 1 ± 0.3

Lung

0.5 ± 0.1a

0.7 ± 0.1

0.34 ± 0.02b,d,f

0.6 ± 0.1

Liver

5.5 ± 0.3c

4.2 ± 0.9

1.8 ± 0.1b,d,f

3.1 ± 0.7

Spleen

0.9 ± 0.1a

1.1 ± 0.1

0.47 ± 0.04b,d,f

1.0 ± 0.1

Stomach

0.8 ± 0.1

0.8 ± 0.2

0.4 ± 0.1b,d

0.7 ± 0.1

Kidney

297 ± 16a,c

220 ± 30

237 ± 30

211 ± 41

Tumor

9 ± 3

8 ± 2

9 ± 1

7 ± 1

Muscle

0.21 ± 0.03

0.3 ± 0.1

0.11 ± 0.01b,d,f

0.23 ± 0.04

Bone

0.9 ± 0.1

0.9 ± 0.3

0.4 ± 0.1b,d

0.7 ± 0.2

24h

Blood

0.07 ± 0.01c

0.08 ± 0.01e

0.09 ± 0.01f

0.15 ± 0.01

Salivary glands

1.0 ± 0.3

1.5 ± 0.2e

0.4 ± 0.1d

0.8 ± 0.2

Lung

0.3 ± 0.1

0.7 ± 0.1

0.3 ± 0.1

0.4 ± 0.1

Liver

3.6 ± 0.4a,c

4.6 ± 0.4

1.2 ± 0.2b,d,f

2.6 ± 0.1

Spleen

0.9 ± 0.4

1.1 ± 0.1

0.4 ± 0.1b,d,f

0.9 ± 0.1

Stomach

0.4 ± 0.1

0.9 ± 0.1

0.22 ± 0.04b,d,f

0.40 ± 0.03

Kidney

177 ± 25

212 ± 31

134 ± 16b

144 ± 7

Tumor

8 ± 2c

9 ± 1

7 ± 2

5 ± 1

Muscle

0.16 ± 0.02

0.31 ± 0.04

0.08 ± 0.02d,f

0.20 ± 0.04

Bone

0.5 ± 0.1c

1.0 ± 0.3

0.3 ± 0.1d,f

0.8 ± 0.1

  1. Data are presented as mean %ID/g values with SD from four mice. One-way ANOVA with Bonferroni’s multiple comparisons test was performed to find significant differences. aSignificant difference between [99mTc]Tc(CO)3-H6-G3 and [99mTc]Tc(CO)3-G3-H6. bSignificant difference between [99mTc]Tc(CO)3-H6-G3 and [99mTc]Tc(CO)3-(HE)3-G3. cSignificant difference between [99mTc]Tc(CO)3-H6-G3 and [99mTc]Tc(CO)3-G3-(HE)3. dSignificant difference between [99mTc]Tc(CO)3-G3-H6 and [99mTc]Tc(CO)3-(HE)3-G3. eSignificant difference between [99mTc]Tc(CO)3-G3-H6 and [99mTc]Tc(CO)3-G3-(HE)3. fSignificant difference between [99mTc]Tc(CO)3-(HE)3-G3 and [99mTc]Tc(CO)3-G3-(HE)3.