Related Experiment Video
Updated: Jun 16, 2026
08:26
Development of Amelogenin-chitosan Hydrogel for In Vitro Enamel Regrowth with a Dense Interface
Published on: July 10, 2014
Photoactive chitosan switching on bone-like apatite deposition
Valeria Chiono1, Piergiorgio Gentile, Francesca Boccafoschi
1Department of Mechanics, Politecnico di Torino, Italy.
Biomacromolecules
|January 21, 2010
Summary
This study synthesized a chitosan-g-fluorescein (CHFL) polymer that stimulates bone-like apatite deposition under visible light. This biocompatible photosensitizer enhances osteoblast cell adhesion, proliferation, and mineralization, offering potential for bone and dental repair therapies.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Biomedical Engineering
Background:
- Chitosan (CH) is a biocompatible polymer with potential in tissue engineering.
- Developing photosensitive materials that promote biomineralization is crucial for bone regeneration.
Purpose of the Study:
- To synthesize and characterize a novel chitosan-g-fluorescein (CHFL) conjugate polymer.
- To evaluate CHFL's ability to stimulate hydroxyapatite deposition and support osteoblast-like cell functions under visible light irradiation.
Main Methods:
- Synthesis of CHFL conjugate and characterization using UV-vis and FTIR-ATR spectroscopy.
- Fabrication of CHFL films by solvent casting and assessment of apatite deposition from simulated body fluid (SBF).
- In vitro evaluation of MG63 osteoblast-like cell adhesion, proliferation (MTT assay), and mineralization (ALP assay) on CHFL films.
Main Results:
- Successful synthesis and characterization of the water-soluble CHFL conjugate.
- Visible light irradiation of CHFL films induced significant calcium phosphate crystal deposition, confirmed as apatite.
- CHFL films promoted MG63 cell adhesion and proliferation, with significantly enhanced mineralization under light exposure.
Conclusions:
- The synthesized CHFL conjugate is a biocompatible, water-soluble photosensitizer.
- Visible light activation of CHFL stimulates biomineralization and improves osteoblast function.
- CHFL holds promise for developing new therapeutic strategies in bone and dental tissue repair.
Related Concept Videos
01:40Bone Remodeling
Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
01:18The Bone Matrix
Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in acid or...
01:31Essential Minerals for Bone Health
The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
01:17Hormones and Bone Tissue
The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
01:31Osteoclasts in Bone Remodeling
Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...