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Lung Diseases Related to Stem Cells

Stem cells are considered to be the building cells of the body. All other sections are produced from these raw cells, which perform many specialized functions in the body. Stem cells can divide, whether in vitro (laboratory) or in vivo (body), and they produce more cells called the daughter cells. The newly split cells can either develop into new stem cells or become differentiated, specialized cells that perform definite functions. These specialized cells include brain cells, blood cells, and bone or heart muscle. The only cells with stem cells are those with stem cells potential to be able to generating new cell types; no other cell in the body can do so.

Several sources of stem cells have been discovered over time. The first source is embryonic stem cells, which​​ appear​​ from very naïve embryos​​ that are just three to six days old. At this​​ phase, the cells are​​ said to be​​ pluripotent stem cells, meaning they​​ know how to​​ become any new cell​​ form​​ of body or can divide into new stem cells.​​ This quality makes them able to help scientists find new ways to repair diseased tissues​​ (Gersh,​​ 2009).​​ The second source is adult stem cells​​ present​​ in most adult tissues in small numbers, for example, in fat cells or bone marrow. Mature stem cells have an​​ inadequate​​ ability to generate different cells in the body, unlike embryonic stem cells. The thing that is fascinating about the adult stem cells is that they​​ can create​​ unrelated cell types. For example, bone marrow stem cells might​​ generate​​ heart​​ muscle cells, negating the​​ fact​​ that stem cells of bone marrow can only​​ produce​​ blood cells.​​ Using genetic reprogramming,​​ Scientists have now successfully experimented with transforming adult stem cells into stem cells.​​ This new development has helped researchers to​​ make use of​​ these genetically reprogrammed cells​​ as an alternative​​ to embryonic stem cells. This will provide the edge by reducing the​​ immune system's chances of​​ negative response​​ to​​ the new stem cells. However, it is still unclear if​​ changing​​ adult cells will cause​​ unfavorable​​ effects in humans or not​​ (Joo.,​​ 2012).​​ Another source of stem cells has been discovered in amniotic fluid/ umbilical cord blood stem cells or prenatal stem cells. These cells also have the​​ aptitude​​ to​​ modify​​ themselves into specialized cells. It also helps conduct a test for fetus abnormalities by taking the sample from stem cells of amniotic fluid in the uterus.​​ 

​​ Lung diseases have become very common nowadays. There are four kinds of lung diseases. Lung circulation diseases occur when there is a problem with the lungs' blood vessels; it could be an inflammation of the blood vessel or a blood clot.​​ It reduces the lung's ability to take up oxygen and release carbon dioxide. Airway disease of the lungs includes the blockade of tubes that carry oxygen to the lungs. It causes asthma, chronic bronchitis, and emphysema. Lung tissue diseases involve the defect in the structure of lung tissue. It limits the lungs' expansion, making the inflow of oxygen and outflow of carbon dioxide difficult. Pulmonary fibrosis and sarcoidosis are caused due to lung tissue defects. According to a WHO report, the mortality rate caused by chronic lung diseases has doubled in the last thirty years. The death rate of other chronic diseases is decreasing, making the situation even worse. The main reason behind this is the lack of concern about this disease and its unavailability. The absence of the diagnostic​​ methods to cure these lung diseases is also a hallmark of increasing mortality rates.

Researchers have identified various methods to cure lung diseases using stem cells. The first is to use​​ endogenous lung stem cells that take part in the repair and maintenance of injured lung epithelium (Evans MJ​​ et al.,​​ 1978). The existing lung tissue stem cell therapy has been applied to rodents injury models in the laboratory before, in which cells were​​ worn-out​​ through​​ physical​​ or​​ chemical​​ means (Borthwick​​ et al.,​​ 2001; Giangreco​​ et al.,​​ 2002). After successful experiments, it was applied to humans.​​ Recruited cells also made successes in​​ lung repair and remodeling. Marrow-derived cells have the strong​​ faculty​​ to make a way to the lung's mesenchymal​​ partition, curing the defects in those cells (Hashimoto​​ et al.,​​ 2004). It is still uncertain, however, whether it is more beneficial or harmful to humans (Phillips​​ et al.,​​ 2004). Some researchers have also worked on​​ particular​​ cells​​ consequent​​ from embryonic stem cells​​ to cure lung diseases. Lung progenitor cells can be​​ spawned​​ in vitro by differentiation of embryonic stem cells that enhances its efficiency (Rippon​​ et al.,​​ 2006).

Every day, the application of stem cells to treat diseases is growing. Embryonic stem cells, however, may trigger an immune response that causes the recipient's body to treat the stem cells as foreign invaders, as human embryonic stem cells are extracted from human embryos, leading to many ethical problems.


  • Borthwick DW, Shahbazian M, Krantz QT, Dorin JR, Randell SH. (2001), Evidence for stem-cell niches in the tracheal epithelium. Am J Respir Cell Mol Biol;24: P:​​ 662–670

  • Evans MJ, Cabral-Anderson LJ, Freeman G. (1978) Role of the Clara cell in renewing the bronchiolar epithelium.​​ Lab Invest;38, P: 648–653.

  • Gersh BJ (2009), Cardiac cell repair therapy: A clinical perspective. Mayo Clinic Proceedings,84, P: 876

  • Giangreco A, Reynolds SD, Stripp BR. (2002) Terminal bronchioles harbor a unique airway stem cell population that localizes to the bronchoalveolar duct junction. Am J Pathol;161: P:​​ 173–182

  • Hashimoto N, Jin H, Liu T, Chensue SW, Phan SH. (2004), Bone marrow-derived progenitor cells in pulmonary fibrosis. J Clin Invest;11, P:243–252.

  • Joo S, (2012), Amniotic fluid-derived stem cells in regenerative medicine research. Archives of Pharmacal Research.35, P:271

  • Phillips RJ, Burdick MD, Hong K, Lutz MA, Murray LA, Xue YY, Belperio JA, Keane MP, Strieter RM (2004), Circulating fibrocytes traffic to the lungs in response to CXCL12 and mediate fibrosis. J Clin Invest;114, P:438–446.

  • Rippon HJ, Polak JM, Qin M, Bishop AE (2006), Derivation of distal lung epithelial progenitors from murine embryonic stem cells using a novel 3-step differentiation protocol. Stem Cells:2

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