Delivery of gene products via mesangial cells

C - Chemistry – Metallurgy – 12 – N

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C12N 5/10 (2006.01) A01K 67/027 (2006.01) A61K 35/23 (2006.01) A61K 48/00 (2006.01) C12N 5/06 (2006.01) A61K 38/00 (2006.01)

Patent

CA 2153482

Disclosed are methods that achieve i) site-directed delivery, ii) in situ amplification, and iii) sustained expression of an exogenous gene product within renal glomeruli. An exogenous gene, <u>E. coli</u>.beta.-galactosidase, was introduced into cultured rat mesangial cells using a replication-defective retrovirus, and stable infectants were administered to a rat kidney via the renal artery. In the injected kidney, the engineered, cultured mesangial cells populated 40 % of glomeruli site-specifically. The gene product was detected throughout a 14-week period of observation. In an alternative method, engineered, cultured mesangial cells were injected into a kidney subjected to an antibody that induces mesangiolysis followed by mesangial regeneration. Under these conditions, expression of .beta.-galactosidase was dramatically amplified <u>in situ</u>, and high level expression continued for at least 8 weeks.

Procédés permettant (i) une administration dirigée, (ii) une amplification in situ, et (iii) une expression prolongée d'un produit génique exogène à l'intérieur des glomérules rénaux. On a introduit un gène exogène, la .beta.-galactosidase de E. Coli, dans des cellules mésangiales de culture du rat, à l'aide d'un rétrovirus à réplication défectueuse, et on a administré des substances infectantes stables au rein d'un rat par l'intermédiaire de l'artère rénale. Dans ce rein, les cellules mésangiales de culture manipulées ont peuplé de manière dirigée 40 % des glomérules. On a détecté le produit génique tout au long d'une période de 14 semaines d'observation. Selon un autre procédé, on a injecté des cellules mésangiales de culture et manipulées dans un rein soumis à un anticorps qui provoque une mésangiolyse suivie d'une régénération mésangiale. Dans ces conditions, l'expression de la .beta.-galactosidase était fortement amplifiée in situ, et une expression de haut niveau a duré au moins 8 semaines.

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