コルポラ・カヴェルノサ・フィブロブラストは,ペニスの勃起を媒介する
Eduardo Linck Guimaraes1, David Oliveira Dias1, Wing Fung Hau1
1Department of Cell and Molecular Biology, Karolinska Institutet, 171 77 Stockholm, Sweden.
まとめ
ペニスの勃起と血流は,体穴の周回線維芽細胞によって支えられています. 勃起活動とノッチ信号はこれらの線維芽細胞を調節し,血流に影響を与え,勃起機能を助けます.
科学分野:
- 泌尿器科
- 生理学
- 細胞生物学
背景:
- ペニスの勃起は 血管の膨張を伴う
- ペニスの血流と勃起機能の正確な調節は,まだ完全に理解されていません.
- 周血管線維芽細胞は体穴に存在しますが,その役割は不明です.
研究 の 目的:
- ペニスの勃起と血流の調節における 周周線維芽細胞の役割を調査する.
- 勃起活動とシグナル伝達経路が 線維細胞の集団と機能にどのように影響するかを決定する.
- フィブロブラストがノレピネフリン供給と血管拡張を調節するメカニズムを解明する.
主な方法:
- 洞窟体内の線維細胞の分布と機能の分析
- 勃起機能に関連するノッチ信号経路の活性に関する調査
- フィブロブラストの操作がペニスの血流に与える影響の評価
- フィブロブラスト数と勃起活動と老化との相関
主要な成果:
- コーポラ・カヴェルノザの周血管線維細胞は,ノレピネフリンの可用性を低下させ,血管拡張をサポートする.
- フィブロブラスト数は勃起活動によって動的に調節され,一時的にノッチ信号をダウン調節する.
- ノッチ信号の抑制により 線維細胞の数が増加し,ペニスの血流が強化されます.
- 老化により 線維細胞の数が減り ペニスの血流が減少します
結論:
- 周血管線維細胞は,ペニスの血管拡張と血流を支える上で重要な役割を果たします.
- 勃起性活動は,ノッチ・シグナル伝達を通じて,繊維細胞の集団と機能を適応的に調節する.
- フィブロブラストによるペニスの血流の調節は,活動と年齢によって影響される勃起機能の重要なメカニズムです.
関連する概念動画
Male Sexual Response: Erection & Ejaculation
2.3K
Sexual stimulation can take various forms, such as physical touch and visual or auditory cues. When this happens, the parasympathetic reflex in the sacral portion of the spinal cord is activated. This reflex stimulates the release of nitric oxide (NO), which then dilates the arterioles in the penis, increasing blood flow to the erectile tissues - the corpora cavernosa and corpus spongiosum.
The blood filling the erectile tissues compresses the veins, which helps to prevent blood from leaving...
The blood filling the erectile tissues compresses the veins, which helps to prevent blood from leaving...
2.3K
Penis
4.6K
The penis serves a dual role in sexual reproduction and urination. It consists of three main regions: the glans penis, the body, and the root, each with distinct functions and unique anatomical features.
Anatomy of the Penis
The glans penis, or the head, is the terminal part of the penis and houses the external urethral orifice, the exit point for urine and semen. Covered by the prepuce, or foreskin, the glans is noted for its sensitivity and plays a key role in sexual pleasure. The body of the...
Anatomy of the Penis
The glans penis, or the head, is the terminal part of the penis and houses the external urethral orifice, the exit point for urine and semen. Covered by the prepuce, or foreskin, the glans is noted for its sensitivity and plays a key role in sexual pleasure. The body of the...
4.6K
Nitric Oxide Signaling Pathway
5.0K
Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure...
5.0K
Treatment for Pulmonary Arterial Hypertension: Phosphodiesterase Inhibitors
158
Phosphodiesterase 5 (PDE5) inhibitors are potent enzymes that function to hydrolyze cyclic nucleotides to their corresponding 5' monophosphates. Their unique biochemical properties have been applied in treating Pulmonary Arterial Hypertension (PAH).
Among the PDE5 inhibitors, sildenafil (Revatio) stands out as a competitive and selective inhibitor. It operates by elevating cellular levels of cGMP and augmenting signaling through the cGMP-PKG pathway, promoting vasodilation. Upon oral...
Among the PDE5 inhibitors, sildenafil (Revatio) stands out as a competitive and selective inhibitor. It operates by elevating cellular levels of cGMP and augmenting signaling through the cGMP-PKG pathway, promoting vasodilation. Upon oral...
158
Introduction to Fibroblasts
3.1K
Rudolph Virchow discovered spindle-shaped cells called fibroblasts in 1858. Inactive fibroblasts, called fibrocytes, become activated by various stimuli, such as growth factors and inflammatory cytokines. Activated fibroblasts play a crucial role in wound healing, inflammation, formation of new blood vessels, and cancer progression. Uncontrolled activation of fibroblasts results in fibrosis, the excess deposition of fibrous tissue, which can lead to scarring and affect normal organs. This...
3.1K
Testes: Histology
908
A tough, fibrous membrane, the tunica albuginea, covers the testes, extending inward to form fibrous partitions or septa, dividing them into internal compartments called lobules. Each lobule has 1 to 3 tightly coiled seminiferous tubules where sperm production occurs. These tubules merge into a tubular network at the back of the testis, known as the rete testis. It connects to 15 to 20 efferent ductules, leading to the epididymis.
The spermatogenic cells, responsible for producing sperm, are...
The spermatogenic cells, responsible for producing sperm, are...
908


