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Changes in the distribution of insulin-like growth factor I, thioredoxin, thioredoxin reductase and ribonucleotide reductase during the development of the retina.

Authors: Hansson, HA  Holmgren, A  Norstedt, G  Rozell, B 
Citation: Hansson HA, etal., Exp Eye Res. 1989 Mar;48(3):411-20.
Pubmed: (View Article at PubMed) PMID:2647502

The postnatal development of the rat retina offers good opportunities to follow migration and differentiation of neuroectodermal cells. In this study we have analyzed, by immunohistochemical methods, the distribution of several protein antigens and the trophic peptide insulin-like growth factor I (IGF-I; somatomedin-C). The latter contains disulfide bonds, which in vitro are reduced by the thioredoxin system, i.e. thioredoxin, thioredoxin reductase and NADPH. Ribonucleotide reductase provides growing cells with deoxyribonucleotides, necessary for DNA synthesis, and thioredoxin is an in vitro hydrogen donor. By immunofluorescence IGF-I immunoreactivity was observed throughout the Muller neuroglial cells in the developing retina, but only to a very small extent in the mature retina. Nerve cells showed transient expression of IGF-I during their development. The IGF-I immunoreactivity is likely to be due to local synthesis, since we could demonstrate retinal IGF-I mRNA. Treatment with the transport-blocking agent colchicine caused the Muller glial cells and the retinal pigment epithelium cells to become IGF-I immunoreactive. Thioredoxin and thioredoxin reductase immunoreactivities are confined to neurons and photoreceptor cells in the developing retina. Ribonucleotide reductase subunit M1 immunoreactivity was only observed during the first postnatal week in proliferating neuroectodermal cells. In conclusion, IGF-I and ribonucleotide reductase subunit M1 immunoreactivities are transiently expressed by neuroectodermal cells in the developing rat retina. In contrast, the proteins of the thioredoxin system are demonstrable also in the mature retina.

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CRRD Object Information
CRRD ID: 5133699
Created: 2011-06-24
Species: All species
Last Modified: 2011-06-24
Status: ACTIVE



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