Related Experiment Video

Updated: Aug 11, 2026

Isolation of Primary Myofibroblasts from Mouse and Human Colon Tissue
06:59

Isolation of Primary Myofibroblasts from Mouse and Human Colon Tissue

Published on: October 13, 2013

Pentoxifylline, pentifylline, and interferons decrease type I and III procollagen mRNA levels in dermal fibroblasts:

M R Duncan1, A Hasan, B Berman

  • 1Department of Dermatology and Cutaneous Surgery, University of Miami School of Medicine, Florida.

The Journal of Investigative Dermatology
|February 1, 1995
PubMed

Insights

Pentoxifylline and related compounds inhibit fibroblast collagen synthesis by reducing procollagen mRNA. This mechanism involves new protein synthesis and down-regulation of nuclear factor-1 (NF-1) transcription factor activity.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Dermatology

Background:

  • Pentoxifylline (PTX) is a methylxanthine with known biologic activities, including collagen synthesis inhibition.
  • PTX's effects are potentially linked to transcription factor-mediated gene regulation.
  • Fibroblast collagen production is a key process in skin biology and wound healing.

Purpose of the Study:

  • To investigate if PTX inhibits collagen synthesis at the transcriptional level.
  • To identify the role of nuclear factor-1 (NF-1) in PTX-mediated collagen synthesis inhibition.
  • To compare the effects of PTX, pentifylline (PTF), and interferons on procollagen gene expression.

Main Methods:

  • Fibroblast cultures were treated with PTX, PTF, or interferons for 48 hours.
  • Procollagen mRNA levels were quantified using RNA analysis.
  • Nuclear NF-1 binding activity was assessed using gel mobility shift assays.

Main Results:

  • PTX, PTF, and interferons significantly reduced procollagen mRNA levels (alpha 1(I), alpha 2(I), alpha 1(III)).
  • The reduction in procollagen mRNA was dependent on new protein synthesis, as indicated by cycloheximide treatment.
  • Fibroblast extracts from treated cells showed a lack of proteins binding to the NF-1 consensus DNA sequence.

Conclusions:

  • Methylxanthines (PTX, PTF) and interferons inhibit fibroblast collagen synthesis.
  • This inhibition occurs via suppression of procollagen gene transcription.
  • The mechanism involves new protein synthesis and down-regulation of NF-1 activity.

More Related Videos

Vasodilation of Isolated Vessels and the Isolation of the Extracellular Matrix of Tight-skin Mice08:09

Vasodilation of Isolated Vessels and the Isolation of the Extracellular Matrix of Tight-skin Mice

Published on: March 24, 2017

Evaluation of Keratinocyte Proliferation on Two- and Three-dimensional Type I Collagen Substrates08:19

Evaluation of Keratinocyte Proliferation on Two- and Three-dimensional Type I Collagen Substrates

Published on: April 22, 2019

Related Concept Videos

TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
Fibril-associated Collagen01:11

Fibril-associated Collagen

Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
Type IV Collagen of Basal Lamina01:05

Type IV Collagen of Basal Lamina

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.
A type IV collagen molecule has six alpha chains which can exist in...
Transducer Mechanism: Nuclear Receptors01:31

Transducer Mechanism: Nuclear Receptors

Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
T Cell Types and Functions01:24

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...