Human retinal proteomics study of adults and two-month old infants

Abstract

Objective To identify proteins that have expressed in human eyes from adults and two-month old infants by proteomics approach, so as to build a two-dimensional gel electrophoresis (two-DE) reference map for human retina. The difference of proteomics between the retinas of adults and two-month old infants are also studied. Methods Human retina tissues were collected from donor eyes (nine adults and two infants). Proteins were separated by two-DE. The gels were analyzed by image software. Protein spots were excised from the gels and detected by matrix assisted laser desorption ionization time off light mass spectrometry (MALDI-TOF-MS). Results A total of 1179 spots and 1295 spots were detected respectively on two-DE gels of Coomassie-stained adults and two-month old infants retina, of which 1039 spots were matched in the position. Five spots up-regulated were successfully identified. Human serum albumin and 4 guanylate kinase 1 (GUK1) were identified in adult retina. β2-tubulin, transaldolasel and alpha A-crystallin were identified in infant retina. Conclusion The two-DE reference map for retina proteomics is successfully established. This study provides an evidence of changes in retinal protein levels between adults and infants and biochemical pathways for future studies of human retina development. Key words: Proteomics; Retina/physiology; Adult; Infant