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2014 ; 7
(3
): 437-40
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Experimental histopathological study on retinal and renal cellular response to
intravitreous antiangiogenic drugs
#MMPMID24967187
Fortes Filho JB
; Maia M
; Tartarella MB
; Meyer FS
; Fortes BG
; Kliemann LM
Int J Ophthalmol
2014[]; 7
(3
): 437-40
PMID24967187
show ga
AIM: To evaluate histopathological retinal and renal response after one single
dose of intravitreous injection of antiangiogenic drugs ranibizumab and
bevacizumab in rats. METHODS: Experimental study in 60d of life adults Wistar
rats. Ten animals were included. Group 1 included 5 animals that were injected
with 1 µL ranibizumab 1.25 mg in the right eye and with 1 µL of balanced salt
solution (BSS) in the left eye, as control; Group 2 included 5 animals that were
injected with 1 µL of bevacizumab in the right eye and with 1 µL of BSS in the
fellow eye. All injections were performed with Hamilton syringes. After 15d of
the interventions, all animals were sacrificed in CO2 chamber. Both eyes were
enucleated and one kidney was removed, fixed and embedded in paraffin for
histopathological analysis by optic microscopy. For statistical purposes the
initial expected abnormal histopathological responses were defined as 0%.
RESULTS: Atypical histopathological retinal response was detected in 2 eyes
injected with ranibizumab (40%) as well as in 2 control eyes in group 1. Same was
detected in 1 eye injected with bevacizumab (20%) as well as in 1 control eye, in
group 2. The noted atypical findings were lymphocytes and eosinophils in the
vitreous posterior cavity and mild retinal inflammatory reaction with ganglion
cell layer edema but without clinical significance. No atypical histopathological
renal response was detected. CONCLUSION: Unexpected atypical histopathological
retinal response without clinical significance was observed in 3 eyes injected
with antiangiogenic drugs (2 in group 1 and 1 in group 2) as well as in 3 control
eyes (2 in group 1 and 1 in group 2). No atypical renal response was detected
suggesting no extra ocular involvement of the intravitreous injected
antiangiogenic drugs.