Safety and efficacy of a novel cannabinoid chemotherapeutic, KM-233, for the treatment of high-grade glioma.
OBJECTIVE
To test in vitro and in vivo the safety and efficacy of a novel chemotherapeutic agent, KM-233, for the treatment of glioma.


METHODS
In vitro cell cytotoxicity assays were used to measure and compare the cytotoxic effects of KM-233, Delta(8)-tetrahydrocannabinol (THC), and bis-chloroethyl-nitrosurea (BCNU) against human U87 glioma cells. An organotypic brain slice culture model was used for safety and toxicity studies. A human glioma-SCID mouse side-pocket tumor model was used to test in vivo the safety and efficacy of KM-233 with intratumoral and intra-peritoneal administration.


RESULTS
KM-233 is a classical cannabinoid with good blood brain barrier penetration that possesses a selective affinity for the CB2 receptors relative to THC. KM-233 was as efficacious in its cytotoxicity against human U87 glioma as Delta(8)-tetrahydrocannabinol, and superior to the commonly used anti-glioma chemotherapeutic agent, BCNU. The cytotoxic effects of KM-233 against human glioma cells in vitro occur as early as two hours after administration, and dosing of KM-233 can be cycled without compromising cytotoxic efficacy and while improving safety. Cyclical dosing of KM-233 to treat U87 glioma in a SCID mouse xenograft side pocket model was effective at reducing the tumor burden with both systemic and intratumoral administration.


CONCLUSIONS
These studies provide both in vitro and in vivo evidence that KM-233 shows promising efficacy against human glioma cell lines in both in vitro and in vivo studies, minimal toxicity to healthy cultured brain tissue, and should be considered for definitive preclinical development in animal models of glioma.
Duntsch
Christopher
C
Department of Neurosurgery, The University of Tennessee Health Science Center, Memphis, TN 38163, USA. duntsch@bellsouth.net
Divi
Murali Krishna
MK
Jones
Terreia
T
Zhou
Qihong
Q
Krishnamurthy
Mathangi
M
Boehm
Peter
P
Wood
George
G
Sills
Allen
A
Moore
Bob M
BM
D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D001932:Brain Neoplasms / Q000188:drug therapy*; D002186:Cannabinoids / Q000494:pharmacology*; D002330:Carmustine / Q000494:pharmacology; D045744:Cell Line, Tumor; D013759:Dronabinol / Q000494:pharmacology; D004334:Drug Administration Schedule; D005910:Glioma / Q000188:drug therapy*; D006801:Humans; D020128:Inhibitory Concentration 50; D051379:Mice; D016513:Mice, SCID; D009924:Organ Culture Techniques
D000970:Antineoplastic Agents; D002186:Cannabinoids; C512823:KM-233; D013759:Dronabinol; D002330:Carmustine