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crc press - E-Lib FK UWKS

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Cell-Penetrating Peptide Conjugations and Magnetic Cell Labels 343<br />

H 2N<br />

GRKKRRQRRRGYK-NH 2<br />

Bound (nmole)<br />

5<br />

4<br />

3<br />

2<br />

1<br />

0<br />

0<br />

- OOC<br />

N<br />

C N N COO -<br />

O<br />

Gd +3<br />

FIGURE 15.10 Top: Chemical structure of Tat-DOTA-Gd. The center ion can be replaced<br />

with Dy or In. Center: Uptake of Tat-DOTA- 111 In and DOTA- 111 In into mouse lymphocytes.<br />

Bottom: MR image of unlabeled (left) and Gd-Tat labeled cells (right) embedded in agar (T1<br />

weighted spin-echo (TR/TE) 300/11). The labeled lymphocytes appear markedly hyperintense<br />

and are readily detectable. (From Bhorade, R. et al., Bioconjug. Chem., 11, 301, 2000. With<br />

permission.)<br />

N<br />

100 200<br />

Added (nmole)<br />

COO -

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