Total syntheses of three copper (II) tetracarboranylphenylporphyrins containing 40 or 80 boron atoms and their biological properties in EMT-6 tumor-bearing mice.

Abstract:

:Three carboranyltetraphenylporphyrins containing 40 or 80 boron atoms were synthesized and evaluated for their biodistribution and toxicity in EMT-6 tumor-bearing mice. Copper (II) meso-5,10,15,20-tetrakis[3-methoxy-4-(o-carboranylmethoxy)phenyl]porphyrin, 6, and copper (II) meso-5,10,15,20-tetrakis[3-hydroxy-4-(o-carboranylmethoxy)phenyl]porphyrin, 8, are B40 congeners with different lipophilicities, each less than their B80 congener, copper (II) meso-5,10,15,20-tetrakis[m-(3,5-di-o-carboranylmethoxybenzyloxy)phenyl]porphyrin, 18. Two days after the last of a series of i.p. injections in BALB/c mice bearing EMT-6 mammary tumors, a dose of 185 mg/kg 6 (54 mg/kg B) delivered over 3.5 times the concentration of boron to tumor (169 microg/g B) than did 118 mg/kg 8 (36 mg/kg B), which delivered 35 microg/g B, or 87 mg/kg 18 (30 mg/kg B), which delivered 46 microg/g B. The tumor-to-blood and tumor-to-brain boron concentration ratios at that time for all three porphyrins exceeded 80:1. Two days after the last injection, there resulted moderate thrombocytopenia that essentially disappeared two days later from 6 and 18, and mild leukocytosis from 6, 8, and 18, all of which were clinically inconsequential. Thus, 6 may rank among the most clinically promising carboranyl porphyrins ever made to deliver 10B to tumors for boron neutron-capture therapy (BNCT) that has also been tested for its toxicity in vivo.

journal_name

Bioorg Med Chem

authors

Wu H,Micca PL,Makar MS,Miura M

doi

10.1016/j.bmc.2006.04.010

subject

Has Abstract

pub_date

2006-08-01 00:00:00

pages

5083-92

issue

15

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(06)00291-4

journal_volume

14

pub_type

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