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MRC-5 ( Medical Research Council cell strain 5) is a diploid
cell culture Cell culture or tissue culture is the process by which cells are grown under controlled conditions, generally outside of their natural environment. The term "tissue culture" was coined by American pathologist Montrose Thomas Burrows. This te ...
line composed of
fibroblast A fibroblast is a type of cell (biology), biological cell that synthesizes the extracellular matrix and collagen, produces the structural framework (Stroma (tissue), stroma) for animal Tissue (biology), tissues, and plays a critical role in wound ...
s, originally developed from the
lung The lungs are the primary organs of the respiratory system in humans and most other animals, including some snails and a small number of fish. In mammals and most other vertebrates, two lungs are located near the backbone on either side of t ...
tissue of a 14-week-old
aborted Aborted is a Belgian death metal band formed in 1995 in Waregem. The group currently consists of vocalist, founder and only constant member Sven de Caluwé, guitarist Ian Jekelis, bassist Stefano Franceschini and drummer Ken Bedene. Although th ...
Caucasian male
fetus A fetus or foetus (; plural fetuses, feti, foetuses, or foeti) is the unborn offspring that develops from an animal embryo. Following embryonic development the fetal stage of development takes place. In human prenatal development, fetal deve ...
. The cell line was isolated by J.P. Jacobs and colleagues in September 1966 from the seventh population doubling of the original strain, and MRC-5 cells themselves are known to reach
senescence Senescence () or biological aging is the gradual deterioration of functional characteristics in living organisms. The word ''senescence'' can refer to either cellular senescence or to senescence of the whole organism. Organismal senescence inv ...
in around 45 population doublings.


Applications

MRC-5 cells are currently used to produce several vaccines including for
hepatitis A Hepatitis A is an infectious disease of the liver caused by ''Hepatovirus A'' (HAV); it is a type of viral hepatitis. Many cases have few or no symptoms, especially in the young. The time between infection and symptoms, in those who develop them ...
, varicella and
polio Poliomyelitis, commonly shortened to polio, is an infectious disease caused by the poliovirus. Approximately 70% of cases are asymptomatic; mild symptoms which can occur include sore throat and fever; in a proportion of cases more severe s ...
.


Culture and society

During the
COVID-19 pandemic The COVID-19 pandemic, also known as the coronavirus pandemic, is an ongoing global pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The novel virus was first identif ...
, anti-vaccination and
anti-abortion Anti-abortion movements, also self-styled as pro-life or abolitionist movements, are involved in the abortion debate advocating against the practice of abortion and its legality. Many anti-abortion movements began as countermovements in respons ...
activists believed that MRC-5 was an ingredient of the
Oxford–AstraZeneca COVID-19 vaccine The Oxford–AstraZeneca COVID19 vaccine, sold under the brand names Covishield and Vaxzevria among others, is a viral vector vaccine for prevention of COVID-19. Developed in the United Kingdom by Oxford University and British-Swedish comp ...
, citing a study from the University of Bristol. David Matthews, a co-author for this study, clarified that MRC-5 was solely used for testing purposes to determine "how the Oxford vaccine behaves when it is inside a genetically normal human cell." The manufacturing of the vaccine used the
HEK 293 Human embryonic kidney 293 cells, also often referred to as HEK 293, HEK-293, 293 cells, or less precisely as HEK cells, are a specific immortalised cell line derived from a spontaneously miscarried or aborted fetus or human embryonic kidney cells ...
fetal cell line, the kidney cells of an aborted or spontaneously miscarried female fetus, though the cells are filtered out of the final product.


See also

*
Use of fetal tissue in vaccine development The use of fetal tissue in vaccine development is the practice of researching, developing, and producing vaccines through growing viruses in cultured (laboratory-grown) cells that were originally derived from human fetal tissue. Since the cell s ...
*
WI-38 WI-38 is a diploid human cell line composed of fibroblasts derived from lung tissue of a 3-month-gestation female fetus. The fetus came from the elective abortion of a Swedish woman in 1963. She was disinterested in the fate of the fetus and its s ...


References


External links


Cellosaurus entry for MRC-5
Human cell lines {{vaccine-stub