Control of erythropoietin secretion by doxycycline or mifepristone in mice bearing polymer-encapsulated engineered cells.

Abstract:

:Cell encapsulation offers a safe and manufacturable method for the systemic delivery of therapeutic proteins from genetically engineered cells. However, control of dose delivery remains a major issue with regard to clinical application. We generated populations of immortalized murine NIH 3T3 fibroblasts that secrete mouse erythropoietin (Epo) in response to stimulation by doxycycline or mifepristone. Engineered cells were introduced into AN69 hollow fibers, which were implanted in the peritoneal cavity or recipient mice. Animals receiving doxycycline or mifepristone showed stable polyhemia and increased serum Epo concentrations over a 6-month observation period, whereas animals not receiving the inducer drug had normal hematocrits. Epo secretion could be switched on and off, depending on the presence of doxycycline in the drinking water. In contrast, polyhemia was hardly reversible after subcutaneous injections of mifepristone. These data show that a permanent and regulated systemic delivery of a therapeutic protein can be obtained by the in vivo implantation of engineered allogeneic cells immunoprotected in membrane polymers.

journal_name

Hum Gene Ther

journal_title

Human gene therapy

authors

Serguera C,Bohl D,Rolland E,Prevost P,Heard JM

doi

10.1089/10430349950018823

keywords:

subject

Has Abstract

pub_date

1999-02-10 00:00:00

pages

375-83

issue

3

eissn

1043-0342

issn

1557-7422

journal_volume

10

pub_type

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