The oral bacterium or bacteria naturally inhabiting in the mouth of an individual are usually harmless. However, for some uncertain reasons, they become injurious and disease-causing once they have entered or infiltrated a different habitat. Researchers have been searching for some clues on how to resolve these problems. The more interesting thing is that how these bacteria came to infiltrate and damage the heart once they have attacked it. At the core of the debate on whether particular oral pathogens may possibly be a factor to the inception of cardiovascular illness is the subject of mechanism or procedure on how precisely bacteria take possession of the heart. Additionally, the steps or actions performed by the bacteria in the course of their colonization that initiate an immune reaction that leads to the inflammation frequently connected with cardiovascular disease. In one of the issues of the journal Cellular Microbiology the probable answers were published.

The investigators sponsored by the National Institute of Dental and Craniofacial Research together with their contemporaries offered an explanation. They illustrated in studies with human cells that the oral bacterium Porphyromonas gingivalis depends on its main fimbria, which is the heavier of its two external and finger-like appendages in order to connect to and effectively attack the endothelial cells that line the inside surface of the human aorta.  Endothelial cells are layer of flat cells that line the blood vessels, lymphatic vessels and the heart. The investigators then discovered that the lighter fimbria known as the minor fimbria seem to perform a vital role in assisting the bacterium in order to obtain an entry into the endothelial cells. Subsequently, the investigators uncovered different and numerous elements of the inflammatory reaction as well as the emission of some signaling proteins by immune cells and the creation of adhesion molecules by the endothelial cells.

Fascinatingly, the investigators recommended that changes in the expression of the fimbria may possibly aid the Porphyromonas gingivalis bring out inflammatory variations inside the endothelium that prompt the aorta to develop clogging plaques. The investigators deduced that though ultimate evidence of an informal part of infectious agents causative of atherosclerosis is still absent, the outcomes of the research studies suggest a system or procedure by which both the major and minor fimbria of undamaged Porphyromonas gingivalis can smooth the progress of inflammatory reactions by endothelial cells by means of alteration of the actin cytoskeleton. Actin is one of the protein components into which actomyosin can be split. It can exist in a fribrous form or a globular form. Further, cytoskeleton is the tonofilaments, keratin, desmin, neurofilaments or other intermediate filaments serving as supportive cytoplasmic elements to stiffen cells or to organize intracellular organelles.
At the moment, researchers keep on doing researches, investigations and experiments in order to understand the behaviors and the mechanisms of the oral pathogens for the purpose of knowing how to discredit and contrast their actions once they have entered a different part of the body as well as to discover the cure of the consequential heart diseases.