Hussaini Syed-Sha-Qhattal
DPT Laboratories, USA
Title: Tumor targeted hyaluornan grafted Liposomes – design and process development challenges
Biography
Biography: Hussaini Syed-Sha-Qhattal
Abstract
Hyaluronan grafted liposomes were developed to provide long circulation of the loaded drugs while also providing the receptor CD44 mediated internalization by target tumor cells. Investigations were carried out in vitro and in vivo to determine the effect of polymer molecular weight, grafting density along with presence or absence of PEGylated lipids on the liposome. Classical radiopharmacokinetics and Near Infrared Animal imaging techniques were used to track the biofate of the injected liposomes in healthy and tumor bearing mice. We observed that presence of surface hyaluronan negatively impacts the circulation and thus tumor accumulation of liposomes. When PEGylated lipids were incorporated in the hyaluronan liposomes a decrease in clearance of these liposomes was seen which correlated well with longer circulation and enhanced tumor accumulation. Enhanced tumor internalization was associated with the hyaluronan moiety of the liposomes and they had nearly two fold higher internalization compared to Pegylated liposomes devoid of Hyaluronan. Enhanced cell kill was then demonstrated by a Caspase-3 staining of the tumor slices suggesting the enhanced efficacy of hyaluronan grafted tumor targeted liposomes compared to PEGylated liposomes.This study was then analyzed for the industrial feasability was outlined with discussion on the generic reverse engineering concepts.