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The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
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The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
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The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which...
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The Contribution of Co-signaling Pathways to Anti-malarial T Cell Immunity.

Rebecca Faleiro1, Deshapriya S Karunarathne1, Joshua M Horne-Debets1

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Summary

Malaria

Keywords:
Immuno-therapycerebral malariachronic malariaexperimental cerebral malariaimmunityinhibitory receptors on T cellsmalariastimulatory receptors on T cells

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Vaccinology

Background:

  • Malaria, caused by *Plasmodium* parasites, led to millions of infections and deaths, particularly in children.
  • Existing malaria vaccines like RTS,S offer limited, short-term protection, especially against severe disease.
  • T cell dysfunction during malaria hinders effective immunity and vaccine efficacy.

Purpose of the Study:

  • To review molecular signals that regulate T cell-mediated immunity in malaria.
  • To understand why T cell responses are inhibited during malaria infection.
  • To identify potential targets for improved malaria treatments and vaccines.

Main Methods:

  • This review synthesizes existing research on T cell regulation in malaria.
  • It examines studies on immune regulatory receptors, focusing on programmed cell-death-1 (PD-1).
  • The review analyzes molecular mechanisms underlying T cell inhibition during malaria.

Main Results:

  • T cell functions are significantly inhibited during malaria infections.
  • Immune regulatory receptors, notably PD-1, play a crucial role in suppressing T cell responses.
  • Understanding these inhibitory signals is key to overcoming vaccine limitations.

Conclusions:

  • Subdued T cell immunity, mediated by receptors like PD-1, contributes to malaria pathogenesis.
  • Targeting these regulatory pathways could lead to more effective malaria therapies.
  • Further research into molecular signals is essential for developing improved malaria control strategies.