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Type IV Collagen of Basal Lamina01:05

Type IV Collagen of Basal Lamina

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Type IV collagen is a 400 nm long, network-forming collagen that acts as a barrier between the epithelial and endothelial cells. Type IV collagen  forms the backbone of the basement membrane by scaffolding with laminin, entactin, proteoglycans, and fibronectin. Apart from rendering structural support to the basement membrane, it also helps entail signaling potentials necessary for both pathological and physiological functions.
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Three main types of fibers are secreted by fibroblasts: collagen fibers, elastic fibers, and reticular fibers. Collagen fiber is made from fibrous protein subunits linked together to form a long, straight fiber. Collagen fibers, while flexible, have great tensile strength, resist stretching, and give ligaments and tendons their characteristic resilience and strength. These fibers hold connective tissues together, even during the body's movement.
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Unlike epithelial tissue, which is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. This extracellular matrix (ECM) is composed of fibrous proteins like collagen, elastin, and fibronectin in a ground substance consisting of interstitial fluid, cell adhesion proteins, and proteoglycans. The proteoglycans form a gel-like material in the spaces between cells and provide hydration, buffering, binding, and force...
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The Extracellular Matrix01:29

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Related Experiment Video

Updated: Mar 11, 2026

Minced Tissue in Compressed Collagen: A Cell-containing Biotransplant for Single-staged Reconstructive Repair
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Collagen-1 Membrane for Replacing the Bladder Wall.

V I Kirpatovskii1,2, A Yu Efimenko3, V Yu Sysoeva3

  • 1Medical Research and Education Center, Moscow, Russia. vladkirp@yandex.ru.

Bulletin of Experimental Biology and Medicine
|November 24, 2016
PubMed
Summary

Collagen membranes from porcine and cattle tissues show potential for bladder wall repair in rabbits. Porcine collagen membranes demonstrated better tissue integration and functional recovery, making them more suitable for urinary bladder reconstruction.

Keywords:
augmentation cystoplastybladder volumecollagen membraneshistological changes

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Urology

Background:

  • Urinary bladder reconstruction presents challenges in maintaining organ function.
  • Collagen membranes are being explored as potential biomaterials for tissue repair.

Purpose of the Study:

  • To evaluate the efficacy of type 1 collagen membranes from cattle and porcine tissues for repairing resected bladder wall defects in rabbits.
  • To assess the functional volume retention and tissue integration of these collagen membranes.

Main Methods:

  • Fabrication of type 1 collagen membranes from cattle and porcine tissues.
  • Implantation of membranes to repair bladder wall defects in rabbits.
  • Histological analysis and assessment of bladder capacity and volume over 21 days.

Main Results:

  • Both cattle and porcine collagen membranes achieved satisfactory integration and anastomosis.
  • Initial inflammation was observed, more pronounced with cattle collagen, decreasing by day 21.
  • Bladder tissue ingrowth into the membranes was evident from day 14.
  • Porcine collagen membranes showed better recovery of bladder volume by day 21 compared to cattle collagen membranes.

Conclusions:

  • Type 1 collagen membranes are promising for urinary bladder plastic repair.
  • Membranes derived from porcine collagen exhibit superior biocompatibility and functional outcomes compared to those from cattle collagen.