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関連する概念動画

Bone Structure01:55

Bone Structure

Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.
Bone Remodeling01:40

Bone 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.
Amyloid Fibrils03:03

Amyloid Fibrils

Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining, normally used to...
Osteoclasts in Bone Remodeling01:31

Osteoclasts 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...
The Bone Matrix01:18

The 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...
Essential Minerals for Bone Health01:31

Essential 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...

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関連する実験動画

Updated: Jul 10, 2026

Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect
09:35

Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect

Published on: September 11, 2015

ヒドロキシアパタイトの表面誘発ペプチドの折りたたみ

Lisa A Capriotti1, Thomas P Beebe, Joel P Schneider

  • 1Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.

Journal of the American Chemical Society
|April 3, 2007
PubMed
まとめ

研究者は,Hydroxyapatite (HA) 表面に結合すると折りたたむペプチド,JAK1を設計しました. 特定のアミノ酸配列によって引き起こされるこの制御された折り畳みは,バイオマテリアル設計とペプチド工学の新しい道を開きます.

科学分野:

  • バイオマテリアル科学 バイオマテリアル科学
  • ペプチドデザイン ペプチドデザイン
  • 表面化学について

背景:

  • 特定の機能を持つペプチドを設計することは,先進的なバイオ材料にとって極めて重要です.
  • インターフェースでのペプチド構造と行動を制御することは,依然として課題です.
  • ハイドロキシアパタイト (HA) は,生物学的システムにおける重要な鉱物であり,ユニークな表面特性を有しています.

研究 の 目的:

  • ハイドロキシアパタイト (HA) との相互作用で折りたたむ新しいペプチド (JAK1) を設計し,特徴づけること.
  • ガンマ-カルボキシグルタミン酸 (Gla) 残留物のHA誘発ペプチド折り畳みにおける役割を調査する.
  • HA上のJAK1の結合親和性と表面覆いを定量化するために.

主な方法:

  • 定期的なGla残留を組み込んだDe novoペプチド設計.
  • 円形二重化 (CD) スペクトロスコーピーは,溶液およびHA上の二次構造を評価するために使用されます.
  • 溶液の振る舞いを決定するために分析的超遠心分離.
  • 表面結合を特徴づけるために,アドソルプションイソサームとX線光電子スペクトロスコーピー (XPS) を用いた.

主要な成果:

さらに関連する動画

Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications
05:41

Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications

Published on: February 23, 2017

Synthesis of Graphene-Hydroxyapatite Nanocomposites for Potential Use in Bone Tissue Engineering
07:14

Synthesis of Graphene-Hydroxyapatite Nanocomposites for Potential Use in Bone Tissue Engineering

Published on: July 27, 2022

関連する実験動画

Last Updated: Jul 10, 2026

Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect
09:35

Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect

Published on: September 11, 2015

Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications
05:41

Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications

Published on: February 23, 2017

Synthesis of Graphene-Hydroxyapatite Nanocomposites for Potential Use in Bone Tissue Engineering
07:14

Synthesis of Graphene-Hydroxyapatite Nanocomposites for Potential Use in Bone Tissue Engineering

Published on: July 27, 2022

  • JAK1は緩衝塩水では構造化されていないが,HAと結合すると螺旋状の構造を採用する.
  • ペプチドはHAに強い結合を示し,解離常数 (Kd) は310 nMである.
  • アドソルプションイソテルムとXPSは,JAK1がHA表面に自己限定単層を形成することを示しています.
  • 定期的なGlaの位置付けは,HA誘発の折り畳みメカニズムを支配する.

結論:

  • HA表面は,設計されたペプチドの分子内折り合いを効果的に引き起こすことができます.
  • この研究は,HA誘発ペプチド折り畳みのための基本的な設計規則を提供します.
  • この発見は,ペプチドベースの新しい生体材料と表面機能化戦略の開発に道を開く.