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Differential expression of neuroendocrine-specific protein in form-deprived chick eyes
S Fujii1, M F Escaño, K Ishibashi
1Department of Ophthalmology, Kobe University School of Medicine, Japan. sfujii@post.med.kobe-u.ac.jp
Insights
Form deprivation upregulates neuroendocrine-specific proteins A and C in chick eyes. This suggests a potential link to myopia development, independent of ocular elongation or refractive error.
Area of Science:
- Ophthalmology
- Molecular Biology
- Genetics
Background:
- Form deprivation is a known stimulus for myopia development in animal models.
- Understanding the molecular mechanisms underlying form deprivation is crucial for myopia research.
Purpose of the Study:
- To identify genes with elevated expression in the retina-retinal pigment epithelium-choroid complex of form-deprived chick eyes.
- To investigate the role of neuroendocrine-specific proteins in the response to form deprivation.
Main Methods:
- Differential display technique and cDNA library screening were used to isolate enriched mRNAs from form-deprived chick eyes.
- Neuroendocrine-specific proteins A and C were cloned and their expression levels analyzed using Northern blot, Western blot, and immunohistochemistry.
Main Results:
- A clone homologous to chick neuroendocrine-specific proteins A and C was identified.
- Increased mRNA and protein levels of neuroendocrine-specific proteins A and C were confirmed in form-deprived eyes.
- These proteins were localized to the inner segments of photoreceptor cells, likely cone cells.
Conclusions:
- The expression of neuroendocrine-specific proteins A and C mRNAs in cone photoreceptor cells is upregulated by form deprivation within 14 days.
- This upregulation is not observed in response to negative spectacle lenses, suggesting it's not a consequence of ocular elongation or myopic refraction.
- The induction of these proteins may be causally related to myopia development or an unrelated effect of form deprivation.
Purpose:
To identify genes that are highly expressed in form-deprived retina-retinal pigment epithelium-choroid tissues. Neuroendocrine-specific proteins were found to be highly expressed.
Methods:
mRNAs enriched in retina-retinal pigment epithelium-choroid tissues from 3-, 7-, and 14-day form-deprived chick eyes were isolated by differential display technique with cDNA library screening. Neuroendocrine-specific protein A and C were cloned in control and form-deprived eyes. mRNA and protein levels, with respective regional localizations, were examined by Northern blot, Western blot, and immunohistochemical analyses, respectively.
Results:
The isolated clone included an insert with a sequence homologous to both chick neuroendocrine-specific proteins A and C. The increases in mRNA and protein levels were confirmed by Northern and Western blot analyses, respectively. Immunohistochemical localization of neuroendocrine-specific proteins A and C was detected in the layer of photoreceptor inner segments, presumably in the cone cells. Northern blot analysis using negative lenses showed that levels of neuroendocrine-specific protein A and C mRNAs were not altered using negative lenses.
Conclusions:
The expression of both neuroendocrine-specific proteins A and C mRNAs in cone photoreceptor cells was upregulated within 14 days of form deprivation, but not in response to negative spectacle lenses. These data suggest that the increase in induction of neuroendocrine-specific proteins is not a secondary consequence of ocular elongation or myopic refraction. Induction of neuroendocrine-specific proteins in form-deprived eyes may be causally related to the development of myopia or may be an unrelated effect of form deprivation.