Fibrosis

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Fibrosis
Classification and external resources
Cardiac amyloidosis very high mag movat.jpg
Micrograph of a heart showing fibrosis (yellow - left of image) and amyloid deposition (brown - right of image). Movat's stain.
MeSH D005355

Fibrosis is the formation of excess fibrous connective tissue in an organ or tissue in a reparative or reactive process. This can be a reactive, benign, or pathological state. In response to injury this is called scarring and if fibrosis arises from a single cell line this is called a fibroma. Physiologically this acts to deposit connective tissue, which can obliterate the architecture and function of the underlying organ or tissue. Fibrosis can be used to describe the pathological state of excess deposition of fibrous tissue, as well as the process of connective tissue deposition in healing.[1]

Physiology[edit]

Fibrosis is similar to the process of scarring, in that both involve stimulated cells laying down connective tissue, including collagen and glycosaminoglycans. Immune cells called Macrophages, and damaged tissue between surfaces called interstitium release TGF beta. This can be because of numerous reasons, including inflammation of the nearby tissue, or a generalised inflammatory state, with increased circulating mediators. TGF beta stimulates the proliferation and activation of fibroblasts, which deposit connective tissue.[2]

Examples of fibrosis[edit]

Fibrosis can occur in many tissues within the body, typically as a result of inflammation or damage, and examples include:

Micrograph showing cirrhosis of the liver. The tissue in this example is stained with a trichrome stain, in which fibrosis is colored blue. The red areas are the nodular liver tissue

Lungs

Liver

Heart

Other

References[edit]

  1. ^ Glossary of dermatopathological terms. DermNet NZ
  2. ^ Trojanowska, Maria (15 June 2012). "Mediators of Fibrosis". The Open Rheumatology Journal 6 (1): 70–71. doi:10.2174/1874312901206010070. PMC 3395879. PMID 22802903. 

External links[edit]