Related Experiment Video
Updated: Jul 4, 2025
02:21
Microscopic Electric Rotary Grinding of Plaques Combined with Graft Repair in the Management of Peyronie's Disease
Published on: March 15, 2024
636
Corpora cavernosa fibroblasts mediate penile erection.
Eduardo Linck Guimaraes1, David Oliveira Dias1, Wing Fung Hau1
1Department of Cell and Molecular Biology, Karolinska Institutet, 171 77 Stockholm, Sweden.
Science (New York, N.Y.)
|February 8, 2024
Summary
Penile erection and blood flow are supported by perivascular fibroblasts in the corpora cavernosa. Erectile activity and Notch signaling regulate these fibroblasts, impacting blood flow and potentially aiding erectile function.
Area of Science:
- Urology
- Physiology
- Cell Biology
Background:
- Penile erection involves vasodilation of the corpora cavernosa.
- The precise regulation of penile blood flow and erectile function remains incompletely understood.
- Perivascular fibroblasts are present in the corpora cavernosa, but their role is unclear.
Purpose of the Study:
- To investigate the role of perivascular fibroblasts in regulating penile erection and blood flow.
- To determine how erectile activity and signaling pathways influence fibroblast populations and function.
- To elucidate the mechanisms by which fibroblasts modulate norepinephrine availability and vasodilation.
Main Methods:
- Analysis of fibroblast distribution and function within the corpora cavernosa.
- Investigation of Notch signaling pathway activity in relation to erectile function.
- Assessment of the impact of fibroblast manipulation on penile blood flow.
- Correlation of fibroblast numbers with erectile activity and aging.
Main Results:
- Perivascular fibroblasts in the corpora cavernosa reduce norepinephrine availability, supporting vasodilation.
- Fibroblast numbers are dynamically regulated by erectile activity, which temporarily down-regulates Notch signaling.
- Inhibition of Notch signaling increases fibroblast numbers and enhances penile blood flow.
- Aging leads to a decrease in fibroblast numbers, reducing penile blood flow.
Conclusions:
- Perivascular fibroblasts play a crucial role in supporting penile vasodilation and blood flow.
- Erectile activity adaptively modulates fibroblast populations and function via Notch signaling.
- Fibroblast-mediated regulation of penile blood flow is a key mechanism in erectile function, influenced by activity and age.
Related Concept Videos
01:17Male 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
01:29Penis
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
01:28Nitric 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
01:28Treatment 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
01:09Introduction 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
01:27Testes: 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