腫瘍死滅因子モノクローナル抗体と受容体融合タンパク質の骨代謝に対する異なる作用
Chenyu Ran1, Xinyu Tao2, Huijun Shao3
1Department of Allergy and Clinical Immunity, The First Affiliated Hospital of USTC, Division of Life Sciencesand Medicine, University of Science and Technology of China, No. 17 LuJiang Road, Hefei 230001, Anhui, China; Department of Rheumatology and Immunology, The First Affiliated Hospital of USTC, Division of Life Sciencesand Medicine, University of Science and Technology of China, No. 17 LuJiang Road, Hefei 230001, Anhui, China; Wannan Medical College, No. 10 Kangfu Road, Wuhu 241000, Anhui, China.
International immunopharmacology
|August 21, 2025
まとめ
アダリムマブとは異なり,骨の形成経路を強化することで骨折の治癒を促進します. これは,腫瘍死滅因子-α (TNF-α) 阻害剤が骨の代謝と骨粗鬆症の治療に有意な影響を及ぼすことを示唆している.
科学分野:
- 整形外科
- 免疫学
- 薬理学について
背景:
- 腫瘍死滅因子-α (TNF-α) は,溶解性 (sTNF-α) と膜結合性 (tmTNF-α) の形態を通して骨の代謝に影響を与える.
- エタナーセプト (受容体融合タンパク質) とアダリムマブ (モノクローナル抗体) のようなTNF阻害剤は,これらのTNFα形態を差異的にブロックする.
- 明確なTNFR信号伝達経路は,TNF阻害剤が骨代謝に与える様々な影響を示唆している.
研究 の 目的:
- エタナーセプトとアダリムマブが骨折の治癒に及ぼす影響の違いを調査する.
- これらのTNF阻害剤が骨の代謝に及ぼす様々な影響を調査する.
主な方法:
- ネズミの股関節部欠陥モデルを用いて,10週間にわたって塩分液,エタネルセプト,またはアダリムマブを投与した.
- 骨折の治癒は,総観察,X線,マイクロCT,および組織学的染色を用いて評価された.
- RT- PCRで骨代謝遺伝子発現 (RANKL,COLI,BMP2,DKK1,Runx2,Wnt) を分析した.
主要な成果:
- エタナーセプトの治療は,骨の形成と成熟を促し,オステオカルシン発現を増加させた.
- ヒストロジカルとマイクロCTの分析では,エタネセプト群のトラベキュラは,対照群とアダリムマブ群と比較して,より強固であることが示された.
- エタネルセプトはCOLI,BMP2,DKK1を上昇させ,RANKLを低下させたが,アダリムマブはRANKLの発現を低下させた.
結論:
- エタナーセプトのようなTNFα受容体の融合タンパク質は,BMP2とDKK1経路を通じて骨折の治癒を促進する可能性があります.
- TNF阻害剤は骨の代謝に顕著な影響を及ぼし,新しい骨の形成と潜在的に骨粗鬆症に影響を与えます.
- これらの発見は,骨関連疾患の管理における異なる治療の可能性を強調しています.
関連する概念動画
01:31Osteoclasts in Bone Remodeling
3.2K
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...
3.2K
01:17Hormones and Bone Tissue
2.9K
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...
2.9K
01:24Drugs for Treatment of Crohn's Disease in IBD Using Biologic Agents: Anti-TNF
231
Tumor Necrosis Factor (TNF), a proinflammatory cytokine, contributes significantly to the inflammation seen in Crohn's disease. It exists as soluble TNF and membrane-bound TNF, with actions mediated through TNF receptors (TNFR). TNFR activation leads to the release of proinflammatory cytokines, T-cell activation, collagen production, and leukocyte migration, all contributing to inflammation in Crohn's disease. Anti-TNF monoclonal antibodies, namely infliximab (Remicade), adalimumab...
231
02:57Targeted Cancer Therapies
7.8K
The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
There are several types of targeted therapies against...
There are several types of targeted therapies against...
7.8K
01:27Tumor Immunotherapy
660
Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
660
01:40Bone Remodeling
38.5K
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.
38.5K