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Intravitreal injection of the synthetic peptide LyeTx I b, derived from a spider toxin, into the rabbit eye is safe and prevents neovascularization in a chorioallantoic membrane model J. Venom. Anim. Toxins incl. Trop. Dis.
Silva,Flavia Rodrigues da; Paiva,Mayara Rodrigues Brandão de; Dourado,Lays Fernanda Nunes; Silva,Rummenigge Oliveira; Silva,Carolina Nunes da; Costa,Bruna Lopes da; Toledo,Cibele Rodrigues; Lima,Maria Elena de; Silva-Cunha,Armando da.
Abstract Background: The great diversity of molecules found in spider venoms include amino acids, polyamines, proteins and peptides, among others. Some of these compounds can interact with different neuronal receptors and ion channels including those present in the ocular system. To study potential toxicity and safety of intravitreal injection in rabbits of LyeTx I b, a synthetic peptide derived from the toxin LyeTx I found in venom from the spider Lycosa eritrognatha and to evaluate the angiogenic activity on a CAM model. Methods: ARPE-19 cells were treated with LyeTx I b (0.36; 0.54; 0.72; 2.89; 4.34 or 9.06 μM). In this study, New Zealand rabbits were used. LyeTx I b (2.89 μM) labeled with FITC dissolved in PBS, or only PBS, were injected into...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lycosa eritrognatha; LyeTx I b; Intravitreal injection; Retinal diseases; Toxicity; Retinal neovascularization.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992018000100322
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Development and validation of alternative methods by non-aqueous acid-base titration and derivative ultraviolet spectrophotometry for quantification of sildenafil in raw material and tablets BJPS
Silva,Taízia Dutra; Toledo,Cibele Rodrigues; Vianna-Soares,Cristina Duarte.
Sildenafil citrate (SILC) is a potent phosphodiesterase-5 inhibitor used for erectile dysfunction and pulmonary hypertension. This study shows two simple, fast and alternative analytical methods for SILC determination by non-aqueous titration and by derivative ultraviolet spectrophotometry (DUS) in active pharmaceutical ingredient and/or dosage forms. The quantitation method of SILC active pharmaceutical ingredient by non-aqueous acid-base titration was developed using methanol as solvent and 0.1 mol/L of perchloric acid in acetic acid as titrant. The endpoint was potentiometrically detected. The non-aqueous titration method shows satisfactory repeatability and intermediate precision (RSD 0.70-1.09%). The neutralization reaction occurred in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sildenafil citrate; Vasodilator; Derivative ultraviolet spectrophotometry; Non-aqueous acid-base titrimetry; Sildenafil citrate/quality control..
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502017000100608
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PLGA-corosolic acid implants for potential application in ocular neovascularization diseases BJPS
Toledo,Cibele Rodrigues; Pereira,Vinícius Viana; Andrade,Gracielle Ferreira; Silva-Cunha,Armando.
Angiogenesis is the formation of new blood vessels from preexisting vasculature. Uncontrolled angiogenesis is associated with progression of several ocular pathologies, such as diabetic retinopathy and macular degeneration. Thus, the inhibition of this process consists in an interesting therapeutic target. Corosolic acid (CA) is a natural derivative of ursolic acid, found in many medicinal herbs and exhibits numerous biological properties, including the antiangiogenic activity. The present study reports the production of CA-loaded poly d,l-lactidecoglycolide acid (PLGA) devices by melt technique. HPLC-UV method was developed and validated to evaluate the uniformity and the release profile of the developed systems. The devices were also characterized by...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Corosolic acid; PLGA; Antiangiogenic activity; Implant.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100569
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