Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

pRb and p107 regulate E2F activity during lens fiber cell differentiation

A M Rampalli1, C Y Gao, V M Chauthaiwale

  • 1Laboratory of Molecular and Developmental Biology, National Eye Institute, NIH, Bethesda, Maryland 20892, USA.

Oncogene
|February 19, 1998
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

[Progress in the study of poor response to proprotein convertase subtilisin/kexin type 9 monoclonal antibodies].

Zhonghua xin xue guan bing za zhi·2026
Same author

[The relationship between variant angina pectoris syncope and coronary artery spastic targeted location, arrhythmia and coronary artery stenostic lesion].

Zhonghua xin xue guan bing za zhi·2025
Same author

[Application of modified percutaneous closure in the treatment of ventricular septal rupture after acute myocardial infarction].

Zhonghua xin xue guan bing za zhi·2024
Same author

[Correlation between coronary artery tortuosity and poor prognosis in patients with septal hypertrophic cardiomyopathy].

Zhonghua xin xue guan bing za zhi·2024
Same author

[Observation on the clinical outcomes of continued pregnancy following cesarean scar pregnancy in 55 women].

Zhonghua fu chan ke za zhi·2023
Same author

[Sacubitril/valsartan attenuates left ventricular remodeling and improve cardiac function by upregulating apelin/APJ pathway in rats with heart failure].

Zhonghua xin xue guan bing za zhi·2022

In differentiating lens cells, retinoblastoma protein (pRb) and p107, not p130, primarily regulate E2F transcription factor activity. This study identifies key proteins involved in lens cell growth arrest and differentiation.

Area of Science:

  • Molecular Biology
  • Cellular Differentiation
  • Ophthalmology

Background:

  • E2F transcription factors are crucial for cell cycle regulation.
  • Interactions with pRb family proteins (pRb, p107, p130) inhibit E2F activity during differentiation and growth arrest.
  • Lens epithelial cells differentiate into fiber cells, a process involving regulated growth arrest.

Purpose of the Study:

  • To investigate which E2F and pRb family members regulate growth arrest during lens epithelial cell differentiation.
  • To characterize E2F protein complexes in rat lens epithelia and fiber cells.

Main Methods:

  • Reverse Transcription Polymerase Chain Reaction (RT/PCR) to detect E2F family gene expression.
  • Electrophoretic Mobility Shift Assay (EMSA) to analyze E2F protein complexes.

Related Experiment Videos

  • Immunoblotting (Western blot) and Immunocytochemistry to identify specific proteins (pRb, p107, p130) within complexes and their cellular localization.

    • Main Results:

    • Lens epithelial cells express all five E2F family members; fiber cells express E2F-1, E2F-3, and E2F-5.
    • Epithelial cells form two E2F complexes; fiber cells form three, with one shared complex.
    • p107 is present in one epithelial and two fiber cell E2F complexes. pRb is found in a fiber cell complex (detected by shift/Western assay) and is hypophosphorylated in fiber cells compared to epithelial cells.
    • p130/E2F complexes are absent in fiber cells, correlated with ubiquitinated p130 forms.

    Conclusions:

    • pRb and p107 are the main regulators of E2F activity during rat lens fiber cell differentiation.
    • The absence of p130/E2F complexes suggests a distinct regulatory mechanism in lens fiber cell terminal differentiation compared to other cell types.
    • Understanding these molecular interactions is key to comprehending lens development and potential pathologies.