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Consecutive Reactions01:22

Consecutive Reactions

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Consecutive reactions involve a sequence where the product of a preceding reaction becomes the reactant for the subsequent one. In a simple scheme, A transforms into B, which further reacts to form C, with rate constants k1 and k2, respectively. This concept is evident in the radioactive decay series. Assuming an initial state with only A present, the conservation of matter leads to three coupled differential equations, determining the concentrations of A, B, and C over time.The rate of change...
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Perspectives on Neuroscience
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How One Thing Led to Another.

Irving Weissman1

  • 1Institute for Stem Cell Biology and Regenerative Medicine, Stanford University, Stanford, CA 94305, and Ludwig Center for Cancer Stem Cell Research and Medicine at Stanford, Stanford, CA 94305.

Annual Review of Immunology
|May 12, 2016
PubMed
Summary
This summary is machine-generated.

This research details the journey from studying immune tolerance to discovering hematopoietic stem cells (HSCs) and their role in regenerative medicine and cancer. Blocking the CD47 "don't eat me" signal on cancer cells promotes phagocytosis, offering a new immunotherapy target.

Keywords:
Autobiographystem cell

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Area of Science:

  • Immunology
  • Stem Cell Biology
  • Cancer Research

Background:

  • Research originated from high school experiments on immunological tolerance to transplantation antigens.
  • Studies progressed to the thymus's role in T cell maturation and the discovery of hematopoietic stem cells (HSCs).
  • Previous work identified competing stem cells in protochordates, leading to the documentation of competing HSCs.

Purpose of the Study:

  • To explore the role of hematopoietic stem cells (HSCs) in immune tolerance and regenerative medicine.
  • To investigate the origins and progression of mutations in human acute myelogenous leukemia.
  • To identify universal targets for cancer immunotherapy.

Main Methods:

  • Investigated immunological tolerance and T cell maturation in the thymus.
  • Isolated and performed clinical transplantation of purified hematopoietic stem cells (HSCs).
  • Analyzed stem cell competition in protochordates and human acute myelogenous leukemia.

Main Results:

  • Demonstrated that all preleukemic mutations in acute myelogenous leukemia originate in HSCs, with a defined order.
  • Identified CD47 as a universally upregulated "don't eat me" signal in human cancers.
  • Showed that blocking CD47 with antibodies induces cancer cell phagocytosis.

Conclusions:

  • Hematopoietic stem cell (HSC) research has advanced regenerative medicine and understanding of cancer development.
  • CD47 is the first identified gene common to all cancers, representing a promising target for novel cancer immunotherapies.