Safety and efficacy of intracapsular tranilast microspheres in experimental posterior capsule opacification.

Abstract

PURPOSE:

To evaluate the safety and efficacy of a sustained-release agent designed to reduce posterior capsule opacification (PCO).

SETTING:

Department of Ophthalmology, EENT Hospital, Fudan University, Shanghai, Peoples Republic of China.

METHODS:

Free tranilast (TFree) was incorporated into polylactic acid microspheres and then tested using a rabbit model of PCO. Twenty-nine rabbits were randomized into 5 groups treated with balanced saline solution (BSS control); TFree; or 0.5, 1.0, or 2.0 mg tranilast microspheres (TMicro). Standard phacoemulsification cataract surgery, including manual aspiration of all visible soft lens matter, was performed in all groups. The selected test agent was then injected into the lens capsule. Postoperative clinical examinations were performed at 1, 3, 7, 14, 30, 60, and 90 days. Posterior capsule opacification was quantified using high-resolution computer image analysis at 1, 2, and 3 months. Histological examination was performed at 3 months.

RESULTS:

Eyes treated with TMicro had significantly less PCO than the eyes in the BSS and TFree groups. While the BSS control eyes had increased PCO over 3 months, eyes in the TMicro group had reduced PCO over time in a dose-dependent fashion. Histological examination showed reduced lens epithelial cell proliferation in the TMicro groups, with no manifest damage to the cornea, iris, or retina compared with the BSS controls. There was a transient increase in postoperative inflammation in all tranilast-treated groups compared with the BSS controls.

CONCLUSION:

Sustained-release intracapsular tranilast reduced PCO in an experimental model of PCO, suggesting further investigation of its therapeutic potential is justified.

• Authors: Man Wang, Jin-Jun Zhang, Timothy L Jackson, Xinghuai Sun, Wei Wu, John Marshall
• Journal: Journal of cataract and refractive surgery (J Cataract Refract Surg) Vol. 33 Issue 12 Pg. 2122-8 (Dec 2007) ISSN: 0886-3350 [Print] United States
• PMID: 18053915 (Publication Type: Journal Article)

Chemical References

• Anti-Allergic Agents
• Delayed-Action Preparations
• ortho-Aminobenzoates
• tranilast

Topics

• Animals
• Anti-Allergic Agents (administration & dosage, adverse effects)
• Cataract (drug therapy, pathology)
• Delayed-Action Preparations (administration & dosage, adverse effects)
• Disease Models, Animal
• Dose-Response Relationship, Drug
• Female
• Injections
• Lens Capsule, Crystalline (drug effects, pathology)
• Male
• Microspheres
• Phacoemulsification
• Postoperative Complications
• Rabbits
• Time Factors
• Treatment Outcome
• ortho-Aminobenzoates (administration & dosage, adverse effects)