Experimental Study of the Biodistribution of New Bone-Seeking Compounds Based on Phosphonic Acids and Gallium-68

Biodistribution of 68Ga-NODA-Aminoglucose in Intact and Tumor-Bearing Mice

We studied the biodistribution of ⁶⁸Ga-NODA-aminoglucose (⁶⁸Ga-NODA-AG) in normal mice and mice with experimental model of colon adenocarcinoma tumor. It was shown that ⁶⁸Ga-NODA-aminoglucose was retained in the tumor for 3 h after injection and demonstrated high level of accumulation in the tumor. Rapid clearance of radioactivity from other organs was observed. The results suggest that ⁶⁸Ga-NODA-aminoglucose is a promising agent for tumor visualization by positron emission tomography.

A Comparative Study of the Pharmacokinetics of Bis- and Pentaphosphonic Acids Labeled with Gallium-68 in Rats with Experimental Model of Bone Callus

We analyzed biodistribution of ⁶⁸Ga-labeled hydroxyethylidenediphosphonic acid (⁶⁸Ga-HEDP) and diethylenetriaminepentakis(methylenephosphonic acid) (⁶⁸Ga-DTPMP) in Wistar rats with experimental model of bone callus. It was shown that the content of ⁶⁸Ga-DTPMP and ⁶⁸Ga-HEDP in bone callus was ~1.5-fold higher than in intact femur. ⁶⁸Ga-DTPMP was characterized by higher stability in vivo, higher uptake in the bone tissue, and lower uptake in others visceral organs in comparison with ⁶⁸Ga-HEDP. Thus, ⁶⁸Ga-DTPMP had more suitable pharmacokinetic properties than ⁶⁸Ga-HEDP.