Profile: Protalix Biotherapeutics Inc (PLX.A)
12 Dec 2013
Protalix BioTherapeutics, Inc. is a biopharmaceutical company focused on the development and commercialization of recombinant therapeutic proteins based on its ProCellEx protein expression system, ProCellEx. Using its ProCellEx system, the Company is developing a pipeline of biosimilar or generic versions of recombinant therapeutic proteins based on its plant cell-based expression technology, which focuses pharmaceutical markets and that rely upon known biological mechanisms of action. ProCellEx protein expression system consists of a set of technologies and capabilities for the development of recombinant proteins, including advanced genetic engineering technology and plant cell-based protein expression methods. Its ProCellEx protein expression system is built on flexible custom-designed bioreactors made of polyethylene and optimized for the development of complex proteins in plant cell cultures. In June 2010, it had completed the preliminary phase I clinical trial of PRX-105.
Taliglucerase alfa is a plant cell expressed recombinant glucocerebrosidase enzyme (GCD) for the treatment of Gaucher disease. The Company has commenced pre-clinical studies of an oral form of taliglucerase alfa. Its oral taliglucerase alfa is a plant cell expressed form of GCD that is naturally encapsulated within carrot cells genetically engineered to express the GCD enzyme. Pre-clinical studies of oral taliglucerase alfa demonstrate the stability of the enzyme in the cell and the capacity of the cell’s cellulose wall to protect the enzyme against degradation in the digestive tract in an in-vitro model of the stomach and intestines. Additionally, rats fed with lyophilized carrot cells expressing GCD have accumulated the active enzyme in the target organs; the spleen and liver. As of December 31, 2010, the Company had completed Phase III Clinical Trial.
The Company is developing PRX-102, its plant cell expressed modified version of the recombinant alpha-GAL-A protein, a therapeutic enzyme for the treatment of Fabry disease. Fabry disease is a rare, hereditary, genetic lysosomal storage disorder in humans caused by an X-lined deficiency of the alpha-GAL-A enzyme. The Company is in the animal evaluation testing phase of the development of PRX-102, which tests are based on a mouse model for Fabry disease.
Protalix Ltd. is a wholly owned subsidiary of the Company is licensed the rights to certain technology under a research and license agreement with Yissum Research and Development Company (Yissum) and the Boyce Thompson Institute, Inc. Pursuant to the agreement, the Company is developing PRX-105, a plant cell-based acetylcholinesterase (AChE) and its molecular variants for the use in several therapeutic and prophylactic indications, as well as in a biodefense program and an organophosphate-based pesticide treatment program.
As of December 31, 2010, its in-vitro experiments of PRX-105 have shown that the acetylcholinesterase enzyme in its ProCellEx protein expression system demonstrates biological activity on biochemical and cellular levels. In addition, early animal studies demonstrated that the acetylcholinesterase expressed in its ProCellEx protein expression system was able to treat animals exposed to the nerve gas agent analogues, both when injected with its acetylcholinesterase product candidate immediately before exposure or when injected after exposure. In March 2010, it initiated a preliminary phase I clinical trial of PRX-105, which the Company completed in June 2010.
pr-antiTNF is a candidate for the treatment of certain autoimmune diseases such as rheumatoid arthritis, juvenile idiopathic arthritis, ankylosing, spondylitis, psoriatic arthritis and plaque psoriasis. The Company has designed the antiTNF as pr-antiTNF. pr-antiTNF is a plant cell-expressed recombinant fusion protein made from the soluble form of the human TNF receptor (TNFR), fused to the Fc component of a human antibody domain. pr-antiTNF has an identical amino acid sequence to Enbrel and its in-vitro and preclinical animal studies have demonstrated that pr-antiTNF exhibits similar activity to Enbrel. Specifically, pr-antiTNF binds TNF thereby inhibiting it from binding to cellular surface TNF receptors and protects L929 cells from TNF-induced apoptosis in a dose-dependent manner.
The Company competes with Genzyme, Actelion, Crucell N.V., Biolex, Inc., Chlorogen, Inc., Greenovation Biotech GmbH, Symbiosys, Novartis AG/Sandoz Pharmaceuticals, BioGeneriX AG, Stada Arzneimittel AG, BioPartners GmbH and Teva.
Protalix Biotherapeutics Inc
2 Snunit St., Science Park, POB