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

Integrin synthesis and utilization in cultured human osteoblasts

M Pistone1, C Sanguineti, A Federici

  • 1Istituto di Fisiologia, University of Genova, Italy.

Cell Biology International
|July 1, 1996
PubMed
Summary

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

The impact of face masks on face-to-face neural tracking of speech: Auditory and visual obstacles.

Heliyon·2024
Same author

Telemonitoring for Cystic fibrosis patients of Bambino Gesù Children's Hospital during COVID-19.

La Clinica terapeutica·2022
Same author

Evaluation of nutritional status through bioimpedance analysis in a group of Cystic Fibrosis patients.

La Clinica terapeutica·2022
Same author

Bone impaction grafting and anti-protrusio cages in high-grade acetabular defects: a 22-year single centre experience.

Archives of orthopaedic and trauma surgery·2021
Same author

[IRM et myocardite infectieuse].

Annales de cardiologie et d'angeiologie·2020
Same author

The PRECEDE-PROCEED model as a tool in Public Health screening: a systematic review.

La Clinica terapeutica·2020

This study examined how cultured human osteoblasts stick to proteins in the extracellular matrix and which integrins are involved. Researchers found that osteoblasts strongly adhere to fibronectin, laminin, and collagen. They used antibodies to test which integrins are important for adhesion and found that beta 1 integrins are key for fibronectin, laminin, and collagen, while alpha 5 integrins are specific to fibronectin. The study also showed that certain integrins organize into focal contacts when cells adhere in the presence of serum, but not on laminin or collagen. These findings help clarify how osteoblasts form stable attachments and could inform tissue engineering strategies.

Area of Science:

  • Cell adhesion mechanisms in tissue engineering
  • Extracellular matrix interactions in bone biology

Background:

Human osteoblasts rely on integrins to interact with the extracellular matrix. Prior research has shown that these cells use specific integrin subunits to adhere to proteins like fibronectin and collagen. However, the exact integrin subtypes involved in adhesion to different matrix proteins remain unclear. This uncertainty drove the need to investigate which integrins are synthesized and how they are organized in focal contacts. No prior work had resolved the localization patterns of integrins on laminin or collagen substrates. Understanding these interactions is essential for advancing tissue engineering and bone regeneration strategies. The role of beta 1 integrins in adhesion has been established, but their distribution in focal contacts is still debated. This gap motivated the current study to clarify integrin utilization in cultured human osteoblasts.

Purpose Of The Study:

The aim of this study was to determine which integrins are synthesized by cultured human osteoblasts and how they are organized in focal contacts. The specific problem addressed was the lack of clarity about integrin subtypes involved in adhesion to different extracellular matrix proteins. The motivation stemmed from the need to understand how osteoblasts form stable attachments in vitro. Researchers sought to identify which integrins are present and where they localize during cell adhesion. The study focused on proteins like fibronectin, laminin, and collagen. The authors proposed to use immunoprecipitation and immunolocalization to detect integrin subunits. By analyzing adhesion patterns, the study aimed to clarify integrin function in focal contacts. This work could help improve cell culture techniques for bone tissue engineering.

Keywords:
integrin adhesionosteoblast cell cultureextracellular matrix proteinsfocal contact formation

Frequently Asked Questions

The study detected synthesis of alpha 3 beta 1, alpha 5 beta 1, alpha v beta 3, and an alpha v beta 1-like dimer in cultured human osteoblasts.

The researchers used immunolocalization techniques to map integrin distribution in focal contacts on different extracellular matrix proteins.

Fibronectin is a major extracellular matrix protein, and the study showed that alpha 5 integrins specifically mediate adhesion to fibronectin.

In serum-containing conditions, beta 3 and alpha v integrins localized in focal contacts, suggesting serum influences integrin organization.

Related Experiment Videos

Main Methods:

The study used cultured human osteoblasts and tested their adhesion to extracellular matrix proteins. Researchers measured adhesion rates to laminin, collagen, vitronectin, and fibronectin. They used antibodies against beta 1 and alpha 5 integrin subunits to assess their role in adhesion. Metabolically labeled cell lysates were immunoprecipitated to detect integrin subunits. A panel of polyclonal antibodies was used to identify alpha and beta subunits. Immunolocalization techniques mapped integrin distribution in focal contacts. Cells were cultured in the presence of serum to observe integrin organization. The study compared adhesion patterns on different substrates to determine integrin localization.

Main Results:

Osteoblasts adhered to fibronectin, laminin, and collagen with 77-100% efficiency within 2 hours. Spreading occurred on these substrates at 55 nM concentration. Antibodies to beta 1 integrin reduced adhesion to fibronectin, laminin, and collagen. Antibodies to alpha 5 integrin only affected adhesion to fibronectin. Immunoprecipitation revealed synthesis of alpha 3 beta 1, alpha 5 beta 1, alpha v beta 3, and alpha v beta 1-like dimers. Immunolocalization showed additional alpha 4, alpha 1, and beta 5 subunits. Beta 3 and alpha v integrins localized in focal contacts when cells adhered in serum. Alpha 5 and beta 1 integrins localized in focal contacts on fibronectin substrates.

Conclusions:

The authors proposed that human osteoblasts synthesize multiple integrin subunits, including alpha 3 beta 1, alpha 5 beta 1, and alpha v beta 3. They suggested that beta 1 integrins are essential for adhesion to fibronectin, laminin, and collagen. The study indicated that alpha 5 integrins specifically mediate adhesion to fibronectin. Researchers observed that beta 3 and alpha v integrins organize into focal contacts in serum-containing conditions. On fibronectin substrates, alpha 5 and beta 1 integrins localized in focal contacts. No integrins localized in focal contacts on laminin or collagen substrates. These findings suggest that integrin localization depends on the extracellular matrix protein. The study supports the idea that integrin distribution varies with substrate type.

No, the study found that none of the integrins investigated localized in focal contacts on laminin or collagen substrates.

The study suggests that integrin localization in focal contacts depends on the extracellular matrix protein, with fibronectin supporting focal contact formation.