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Silva FRD, Paiva MRBD, Dourado LFN, Silva RO, Silva CND, Costa BLD, Toledo CR, de Lima ME, Silva-Cunha AD. 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 chorio-allantoic membrane model. J Venom Anim Toxins Incl Trop Dis 2018; 24:31. [PMID: 30479614 PMCID: PMC6249906 DOI: 10.1186/s40409-018-0168-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 10/31/2018] [Indexed: 12/11/2022] Open
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 vitreous humor. Electroretinogram (ERG) was recorded 1 day before injection and at 7, 14 and 28 days post-injection. Clinical examination of the retina was conducted through tonometer and eye fundus after ERG. Eyes were enucleated and retinas were prepared for histology in order to assess retinal structure. CAMs were exposed to LyeTx I b (0.54; 0.72; 2.17 or 2.89 μM). Results ARPE-19 cells exposed to LyeTx I b showed cell viability at the same levels of the control. The fluorescence of LyeTx I b labeled with FITC indicated its retinal localization. Our findings indicate ERG responses from rats injected in the eye with LyeTx I b were very similar to the corresponding responses of those animals injected only with vehicle. Clinical examination found no alterations of intraocular pressure or retinal integrity. No histological damage in retinal layers was observed. CAM presented reduced neovascularization when exposed to LyeTx I b. Conclusions Intravitreal injection of LyeTx I b is safe for use in the rabbit eye and prevents neovascularization in the CAM model, at Bevacizumab levels. These findings support intravitreal LyeTx I b as a good candidate to develop future alternative treatment for the retina in neovascularization diseases.
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Affiliation(s)
- Flavia Rodrigues da Silva
- 1Faculdade de Farmácia, Universidade Federal de Minas Gerais, Av Antônio Carlos, 6627, 2nd Floor, Room 2031, Pampulha, Belo Horizonte, Minas Gerais 31270-901 Brazil
| | - Mayara Rodrigues Brandão de Paiva
- 1Faculdade de Farmácia, Universidade Federal de Minas Gerais, Av Antônio Carlos, 6627, 2nd Floor, Room 2031, Pampulha, Belo Horizonte, Minas Gerais 31270-901 Brazil
| | - Lays Fernanda Nunes Dourado
- 1Faculdade de Farmácia, Universidade Federal de Minas Gerais, Av Antônio Carlos, 6627, 2nd Floor, Room 2031, Pampulha, Belo Horizonte, Minas Gerais 31270-901 Brazil
| | - Rummenigge Oliveira Silva
- 1Faculdade de Farmácia, Universidade Federal de Minas Gerais, Av Antônio Carlos, 6627, 2nd Floor, Room 2031, Pampulha, Belo Horizonte, Minas Gerais 31270-901 Brazil
| | - Carolina Nunes da Silva
- 1Faculdade de Farmácia, Universidade Federal de Minas Gerais, Av Antônio Carlos, 6627, 2nd Floor, Room 2031, Pampulha, Belo Horizonte, Minas Gerais 31270-901 Brazil
| | - Bruna Lopes da Costa
- 1Faculdade de Farmácia, Universidade Federal de Minas Gerais, Av Antônio Carlos, 6627, 2nd Floor, Room 2031, Pampulha, Belo Horizonte, Minas Gerais 31270-901 Brazil
| | - Cibele Rodrigues Toledo
- 1Faculdade de Farmácia, Universidade Federal de Minas Gerais, Av Antônio Carlos, 6627, 2nd Floor, Room 2031, Pampulha, Belo Horizonte, Minas Gerais 31270-901 Brazil
| | - Maria Elena de Lima
- 2Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901 Brazil
| | - Armando da Silva-Cunha
- 1Faculdade de Farmácia, Universidade Federal de Minas Gerais, Av Antônio Carlos, 6627, 2nd Floor, Room 2031, Pampulha, Belo Horizonte, Minas Gerais 31270-901 Brazil
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