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関連する概念動画

Multipotency and Niche of Bulge Stem Cell01:06

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Hair growth begins with the production of keratinocytes by the basal cells of the hair bulb. As new cells are deposited at the hair bulb, the hair shaft is pushed through the follicle toward the surface. Keratinization is completed as the cells are pushed to the skin surface to form the shaft of hair that is externally visible. The external hair is completely dead and composed entirely of keratin. Hair can be cut or shaven without damaging the hair structure because the cut is superficial. Most...
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The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular...
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The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
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衰えつつあるメラノサイトによるシグナリングは,髪の成長を過度に活性化させる.

Xiaojie Wang1,2,3, Raul Ramos4,5,6, Anne Q Phan7

  • 1Department of Developmental and Cell Biology, University of California, Irvine, CA, USA. xiaojiw2@uci.edu.

Nature
|June 21, 2023
PubMed
まとめ

衰えつつあるメラノサイトは オステオポントンを分泌し 髪の幹細胞を駆使して 髪を再生します この発見により 老化細胞は 再生性疾患の 潜在的治療標的として 注目されるようになりました

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科学分野:

  • 細胞生物学
  • 皮膚科
  • 再生医療

背景:

  • ニッチ信号は幹細胞の静止状態と活性化を制御し 組織を再生させます
  • 制御不能なニッチ信号は 再生障害に寄与する.
  • メラノサイト性ネビは 毛の幹細胞の過剰成長と関連しています

研究 の 目的:

  • ネブスに関連した毛の成長における老化メラノサイトの役割を調査する.
  • ネブスメラノサイトが髪の幹細胞に影響を与える 分子機構を特定する.
  • 再生性疾患における老化細胞のシグナル伝達を標的とした治療の可能性を探求する.

主な方法:

  • ネビの遺伝子モデルを使った
  • ネブスメラノサイトの分泌を分析した.
  • オステオポントンとその受容体CD44の役割を研究した.
  • 人間の毛のあるネビのサンプルを調べた

主要な成果:

  • ネヴィの老化メラノサイトは 毛幹細胞を静止状態から抜け出し 毛の再生を促します
  • オステオポントンはネブスメラノサイトによって分泌される重要なシグナル因子で,髪の成長を促進します.
  • オステオポントンとCD44遺伝子の 削除により 髪の成長が回復しました
  • オステオポントンは人間の毛のあるネビで過剰に発現し,人間の毛胞の成長を刺激します.

結論:

  • 衰老した細胞群からの信号は 隣接する幹細胞の活動を強化し 組織の再生を刺激します
  • 衰えつつあるメラノ細胞と その分泌物,特にオステオポントンは 髪の再生の強力な原動力です
  • 老化細胞は 再生医療の有望な治療目標です