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Dev Dyn. 2014 Oct;243(10):1298-309. doi: 10.1002/dvdy.24141. Epub 2014 Apr 30.

AP-2α is required after lens vesicle formation to maintain lens integrity.

Author information

1
Department of Pathology and Molecular Medicine, McMaster University Health Science Centre, Hamilton, Ontario, Canada.

Abstract

BACKGROUND:

Transcription factors are critical in regulating lens development. The AP-2 family of transcription factors functions in differentiation, cell growth and apoptosis, and in lens and eye development. AP-2α, in particular, is important in early lens development, and when conditionally deleted at the placode stage defective separation of the lens vesicle from the surface ectoderm results. AP-2α's role during later stages of lens development is unknown. To address this, the MLR10-Cre transgene was used to delete AP-2α from the lens epithelium beginning at embryonic day (E) 10.5.

RESULTS:

The loss of AP-2α after lens vesicle separation resulted in morphological defects beginning at E18.5. By P4, a small highly vacuolated lens with a multilayered epithelium was evident in the MLR10-AP-2α mutants. Epithelial cells appeared elongated and expressed fiber cell specific βB1 and γ-crystallins. Epithelial cell polarity and lens cell adhesion was disrupted and accompanied by the misexpression of ZO-1, N-Cadherin, and β-catenin. Cell death was observed in the mutant lens epithelium between postnatal day (P) 14 and P30, and correlated with altered arrangements of cells within the epithelium.

CONCLUSIONS:

Our findings demonstrate that AP-2α continues to be required after lens vesicle separation to maintain a normal lens epithelial cell phenotype and overall lens integrity and to ensure correct fiber cell differentiation.

KEYWORDS:

AP-2; differentiation; lens development; lens epithelium; transcription factors

PMID:
24753151
DOI:
10.1002/dvdy.24141
[Indexed for MEDLINE]
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