A new cell & gene therapy approach to treat common bleeding disorder

July 28, 2020

In a new study from the Wake Forest Institute for Regenerative Medicine (WFIRM) researchers have developed an optimized cellular platform for delivering Factor 8 to better treat patients with hemophilia A.

Hemophilia A is a genetic disorder caused by a deficiency in, or the absence of, coagulation Factor 8), an essential protein for blood to clot. Hemophilia A is an x-linked genetic disease, and thus almost always affects males, and it occurs in 1 in 5,000 live male births. Roughly 20,000 individuals in the United States suffer from hemophilia A, and it is estimated that more than 400,000 people worldwide have this devastating disease, according to http://www.hemophilia.org. Hemophilia A is currently treated with infusions of expensive Factor 8 products 2-3 times per week for the entire life of the patient.

While these treatments have dramatically improved the life expectancy of patients with hemophilia A, they are unavailable to nearly 75% of the world's patients, they cost well over $250,000 a year (per patient), and complications can send the price tag to more than $1 million. Moreover, as many as 30% of patients with the severe form of hemophilia A develop an immune response (inhibitors) to the infused Factor 8 protein, rendering subsequent treatments ineffective and placing the patient at risk of life-threatening bleeding events. In addition, and perhaps most important, these treatments are not curative.

The delivery of Factor 8 through gene and/or cellular platforms has, therefore, emerged as a promising approach to provide long-term correction of hemophilia A. For this study, the researchers investigated the suitability of human placental cells as delivery vehicles for Factor 8 and determined an optimal Factor 8 transgene to secrete therapeutic Factor 8 levels from these cells. Using cells that are modified to over express Factor 8 allows safeguards in production that are not possible when direct vector injection is used to treat patients.

"This is about the quality of life for these patients," said lead author Graca Almeida-Porada, MD, PhD of WFIRM. "We are trying to develop not just a treatment, but a cure."

The research group demonstrated, for the first time, that human placental cells constitutively secrete low levels of Factor 8, confirming these cells possess the machinery necessary to express and process this challenging protein, and suggesting they may be ideally suited as a cellular platform for delivering and producing Factor 8 to correct hemophilia A.

"We demonstrated human placenta-derived mesenchymal cells possess a set of several fairly unique properties that make them ideal both for cellular therapies/regenerative medicine, and as vehicles for Factor 8 delivery," said Almeida-Porada. "In addition, because the pharmaceutical properties of Factor 8 can be markedly enhanced by changing the coding sequence to facilitate Factor 8 processing and secretion by the cells, we identified a modified Factor 8 transgene, amongst the several developed by our colleagues at Emory, that yielded optimal Factor 8 expression and secretion from placental cells."

While our initial goal is to use this treatment to correct hemophilia A prior to birth, Almeida-Porada said the approach could also be used in those pediatric and adult patients who develop Factor 8 inhibitors during their lifetime. Further preclinical studies will be needed to establish in vivo safety and efficacy of this therapy, for both prenatal and postnatal recipients, she added.

"It is our hope this approach can be moved forward as a long-lasting and curative treatment option for patients with hemophilia A," added co-author and WFIRM Director Anthony Atala, MD.
-end-
The study was recently published in the journal Molecular Therapy: Methods & Clinical Development.

Almeida-Porada leads the WFIRM Fetal Research and Therapy Program which is made up by a multidisciplinary team of faculty. The mission of the program is to pursue basic and translational research to develop optimal prenatal treatment approaches for genetic disorders and other life-threatening conditions. WFIRM is the only center in North Carolina to currently house such a research program.

The work was supported by NIH/NHLBI grants HL130856, HL135853 and HL148681. Additional co-authors include: Nadia El-Akabawy, Martin Rodriguez, Ritu Ramamurthy, Andrew Rabah, Brady Trevisan, Alshaimaa Morsi, Sunil George, and Christopher D. Porada, all of WFIRM; Diane Meares and Andrew Farland from the Hematology/Oncology Department at Wake Forest University Health Sciences, and Jordan Shields, Christopher B. Doering, and H. Trent Spencer at Emory University. Authors Almeida-Porada and Porada are inventors on patent rights related to this work owned by Wake Forest University Health Sciences. The patents, whose value may be affected by publication, have the potential to generate royalty income in which the inventors would share.

About the Wake Forest Institute for Regenerative Medicine: The Wake Forest Institute for Regenerative Medicine is recognized as an international leader in translating scientific discovery into clinical therapies, with many world firsts, including the development and implantation of the first engineered organ in a patient. Over 400 people at the institute, the largest in the world, work on more than 40 different tissues and organs. A number of the basic principles of tissue engineering and regenerative medicine were first developed at the institute. WFIRM researchers have successfully engineered replacement tissues and organs in all four categories - flat structures, tubular tissues, hollow organs and solid organs - and 15 different applications of cell/tissue therapy technologies, such as skin, urethras, cartilage, bladders, muscle, kidney, and vaginal organs, have been successfully used in human patients. The institute, which is part of Wake Forest School of Medicine, is located in the Innovation Quarter in downtown Winston-Salem, NC, and is driven by the urgent needs of patients. The institute is making a global difference in regenerative medicine through collaborations with over 400 entities and institutions worldwide, through its government, academic and industry partnerships, its start-up entities, and through major initiatives in breakthrough technologies, such as tissue engineering, cell therapies, diagnostics, drug discovery, biomanufacturing, nanotechnology, gene editing and 3D printing.

Wake Forest Baptist Medical Center

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