00:00 / 00:00
Idiopathic pulmonary fibrosis
0 / 4 complete
0 / 5 complete
Idiopathic pulmonary fibrosis can be broken down into idiopathic which means a disease without a known cause or mechanism, pulmonary which refers to the lungs, and fibrosis which refers to excess collagen in connective tissue, or interstitial tissue between cells, usually after tissue damage.
What triggers the repair process is unknown, but it’s a chronic process that leads to a progressive loss of lung tissue.
Type I pneumocytes make up the majority of cells - they’re simple squamous cells that form a nearly continuous barrier between the air and underlying connective tissue.
Type II pneumocytes are studded throughout the type I - they’re shaped like cubes, have microvilli to sweep away invading particles, and secrete surfactant, an oily mixture of proteins, phospholipids, and neutral lipids which prevent the alveoli from collapsing during exhalation.
Type II pneumocytes also have the ability to divide to make more type II pneumocytes and can also divide and become type I pneumocytes as well.
When the alveolar lining is damaged, type I pneumocytes release transforming growth factor beta1, which gets the type II pneumocytes to stimulate fibroblasts to proliferate and develop into myofibroblasts, which are fibroblasts with some smooth muscle cell properties.
Copyright © 2023 Elsevier, its licensors, and contributors. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Cookies are used by this site.
USMLE® is a joint program of the Federation of State Medical Boards (FSMB) and the National Board of Medical Examiners (NBME). COMLEX-USA® is a registered trademark of The National Board of Osteopathic Medical Examiners, Inc. NCLEX-RN® is a registered trademark of the National Council of State Boards of Nursing, Inc. Test names and other trademarks are the property of the respective trademark holders. None of the trademark holders are endorsed by nor affiliated with Osmosis or this website.