Related Experiment Video

Updated: Feb 11, 2026

Isolation of Primary Mouse Retinal Pigmented Epithelium Cells
06:21

Isolation of Primary Mouse Retinal Pigmented Epithelium Cells

Published on: November 4, 2022

6.2K

Choroidal neovascularization enhanced by Chlamydia pneumoniae via Toll-like receptor 2 in the retinal pigment

Takeshi Fujimoto1, Koh-Hei Sonoda, Kuniaki Hijioka

  • 1Department of Ophthalmology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.

Investigative Ophthalmology & Visual Science
|April 16, 2010
PubMed
Abstract

Insights

Chlamydia pneumoniae infection promotes experimental choroidal neovascularization (CNV) in mice via a Toll-like receptor 2 (TLR2)-dependent pathway. This suggests chronic C. pneumoniae may be a risk factor for age-related macular degeneration (AMD).

Area of Science:

  • Ophthalmology
  • Infectious Diseases
  • Immunology

Background:

  • Choroidal neovascularization (CNV) is a primary cause of vision loss in age-related macular degeneration (AMD).
  • Chlamydia pneumoniae, a bacterium linked to chronic inflammation and cardiovascular disease, is investigated for its role in ocular disorders.
  • Understanding the link between C. pneumoniae and AMD is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the association between Chlamydia pneumoniae infection and the development of experimental CNV.
  • To determine the role of specific immune pathways, including Toll-like receptors (TLRs), in C. pneumoniae-induced CNV.

Main Methods:

  • Experimental CNV was induced in various mouse models (C57BL/6, MyD88 KO, TLR2 KO, TLR4 KO) using laser photocoagulation.
  • Chlamydia pneumoniae antigen was administered to assess its effect on CNV size in vivo.
  • Cytokine gene expression (IL-6, VEGF, TNF-alpha) in retinal pigment epithelium (RPE) cells was analyzed using quantitative real-time PCR.

Main Results:

  • Vitreous injection of C. pneumoniae antigen significantly increased the size of experimental CNV.
  • Mouse RPE cells responded to C. pneumoniae antigen by expressing IL-6 and VEGF, but not TNF-alpha mRNA.
  • The C. pneumoniae antigen did not enhance CNV size in TLR2 knockout mice, indicating a TLR2-dependent mechanism.

Conclusions:

  • Chlamydia pneumoniae can initiate ocular inflammatory responses and promote experimental CNV through a TLR2-dependent pathway.
  • These findings provide experimental evidence suggesting that persistent C. pneumoniae infection could be a risk factor for AMD.

More Related Videos

Primary Cell Cultures from the Mouse Retinal Pigment Epithelium09:35

Primary Cell Cultures from the Mouse Retinal Pigment Epithelium

Published on: March 16, 2018

22.3K
Efficient Derivation of Retinal Pigment Epithelium Cells from Stem Cells07:07

Efficient Derivation of Retinal Pigment Epithelium Cells from Stem Cells

Published on: March 8, 2015

9.7K

Related Concept Videos

Bacterial Phylum Chlamydiae01:29

Bacterial Phylum Chlamydiae

The phylum Chlamydiae or Chlamydiota is composed of a single order, Chlamydiales. This phylum consists entirely of obligate intracellular parasites that infect eukaryotic hosts. While human pathogens within this group have been studied extensively, the phylum encompasses many species capable of interacting with various eukaryotic organisms. Members of Chlamydiae are typically small cocci, approximately 0.5 μm in diameter, and exhibit a distinctive developmental cycle. As is characteristic...
586
Pneumonia I: Introduction01:30

Pneumonia I: Introduction

Pneumonia is an acute respiratory infection that targets the lungs, specifically the alveoli. These tiny air sacs, essential for oxygen exchange, become engorged with pus and fluid, severely hindering breathing, decreasing oxygen absorption, and causing significant pain and discomfort during respiration.
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
925
Pneumonia II: Pathophysiology01:29

Pneumonia II: Pathophysiology

The pathophysiology of pneumonia involves the following steps:
3.0K
Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists01:30

Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists

Cognitive enhancers, also known as "smart drugs," are substances used to enhance memory, mental alertness, and concentration. These can be natural or synthetic and improve cognition in conditions like Alzheimer's disease (AD) and other neurodegenerative diseases. Some common examples include caffeine, amphetamines, methylphenidate, modafinil, arecoline, donepezil, vortioxetine, and piracetam. These enhancers work on the principle of synaptic plasticity and altered circuit function.
656
Pigmentation01:19

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
4.4K
Pneumonia IV: Management01:28

Pneumonia IV: Management

The treatment of pneumonia varies based on its severity and the causative pathogen. Here is a structured approach to managing pneumonia, integrating pharmaceutical and supportive care strategies.
Bacterial Pneumonia Treatment
For bacterial pneumonia, antibiotics serve as the cornerstone of therapy. Initial treatment often begins with empirical antibiotics, tailored to the anticipated causative organism and adjusted based on culture results. Key antibiotic choices include:
829