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Local therapeutic efficacy with reduced systemic side effects by rapamycin-loaded subcapsular microspheres
Lucas L Falke1, Stefan H van Vuuren1, Filis Kazazi-Hyseni2
1Department of Pathology, University Medical Centre Utrecht, The Netherlands.
Biomaterials
|December 28, 2014
Summary
Local delivery of rapamycin microspheres reduced kidney fibrosis and inflammation in rats. This targeted approach minimized systemic side effects, offering a promising strategy for chronic kidney disease treatment.
Area of Science:
- Nephrology
- Pharmacology
- Biomaterials
Background:
- Chronic kidney disease (CKD) is a growing global health concern, with kidney fibrosis as its primary outcome.
- Current systemic treatments for CKD, like rapamycin, have significant side effects.
- Developing localized therapies is crucial to mitigate adverse effects and improve treatment efficacy.
Purpose of the Study:
- To evaluate the antifibrotic potential of rapamycin delivered via microspheres locally under the kidney capsule.
- To assess the local and systemic side effects of this localized rapamycin delivery method.
- To compare the efficacy of local versus systemic rapamycin administration in a rat model of kidney injury.
Main Methods:
- Rapamycin-loaded microspheres were administered subcapsularly in ureter-obstructed rats.
- Intrarenal mTOR activity, myofibroblast accumulation, fibrotic gene expression, and T-lymphocyte infiltration were assessed.
- Systemic effects, including weight loss, were monitored.
Main Results:
- Local rapamycin delivery effectively reduced intrarenal mTOR activity, myofibroblast accumulation, fibrotic gene expression, and T-lymphocyte infiltration.
- Antifibrotic effects were most pronounced near the microsphere depots.
- Unlike systemic rapamycin, local delivery did not cause significant systemic side effects like weight loss.
Conclusions:
- Subcapsular delivery of rapamycin microspheres is a viable strategy for localized antifibrotic therapy in kidney injury.
- This localized approach effectively inhibits fibrosis with reduced systemic toxicity.
- Targeted delivery enhances therapeutic benefits while minimizing off-target adverse effects, paving the way for novel CKD treatments.
