title: Localization of proline-like immunoreactivity in young rat retinal neurons.
abstract: OBJECTIVE
  To localize proline in the rat retina.
  
  
  METHODS
  We prepared antibodies raised against proline coupled to bovine serum albumin (BSA) with glutaraldehyde. To confirm the specificity of the antiserum, crossreactivity with other amino acids was determined using an immunodot procedure. Rat eyes were enucleated on postnatal day 21. Immunohistochemistry was performed on semi-thin sections using gold-labelled secondary antibodies and a silver-enhancement technique.
  
  
  RESULTS
  Immunodots revealed that the antiserum was specific for proline. Amino acids from retinal extracts were separated on gel, transferred to BSA-glutaraldehyde treated filters, and stained with antibodies to determine if our antibody reacted only with proline. Staining was most intense on postnatal day 21 and disappeared in the adult retina. In addition to Muller cells, horizontal cells, amacrine cells, and some cells in the ganglion cell layer were labelled.
  
  
  CONCLUSIONS
  Antibodies raised against proline revealed a transient immunoreactivity in young rat neurons. Our findings strongly indicate that the retina may express a high level of proline in the developmental stages. This result may provide a clue for clarifying the role of proline in the retina.
authors.affiliation: Department of Ophthalmology, Tohoku University School of Medicine, Sendai, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Nishikawa
authors.forename: S
authors.initials: S
authors.lastname: Ishiguro
authors.forename: M
authors.initials: M
authors.lastname: Tamai
mesh_terms: D000818:Animals; D000918:Antibody Specificity; D002846:Chromatography, Affinity; D003429:Cross Reactions / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D007114:Immunization; D007074:Immunoglobulin G / Q000096:biosynthesis / Q000302:isolation & purification; D007150:Immunohistochemistry; D009474:Neurons / Q000737:chemistry*; D011392:Proline / Q000032:analysis* / Q000276:immunology; D011817:Rabbits; D051381:Rats; D017207:Rats, Sprague-Dawley; D012160:Retina / Q000737:chemistry*
chemical_list: D007074:Immunoglobulin G; D011392:Proline