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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...

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Loss- and Gain-of-function Approach to Investigate Early Cell Fate Determinants in Preimplantation Mouse Embryos

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Invariant NKT cell development and function in microRNA-223 knockout mice.

Kai Li¹, Kook-Heon Seo, Tianwen Gao

¹Henry Ford Immunology Program, Henry Ford Health System, Detroit, MI, United States.

International Immunopharmacology

|November 25, 2010

Summary

MicroRNA 223 (miR-223) is highly expressed in invariant natural killer T (iNKT) cells. However, studies show miR-223 is not required for iNKT cell development or function.

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Purification and Expansion of Mouse Invariant Natural Killer T Cells for in vitro and in vivo Studies

Purification and Expansion of Mouse Invariant Natural Killer T Cells for in vitro and in vivo Studies

Published on: February 15, 2021

Area of Science:

Immunology
Molecular Biology
Genetics

Background:

Invariant natural killer T (iNKT) cells are crucial immune regulators implicated in various diseases.
The precise mechanisms governing iNKT cell development and maturation remain incompletely understood.
MicroRNAs (miRNAs) are key regulators of gene expression, with Dicer-dependent miRNAs previously shown to influence iNKT cells.

Purpose of the Study:

To investigate the specific role of microRNA miR-223 in the development, maturation, and function of iNKT cells.
To determine if miR-223 is essential for iNKT cell homeostasis and immune responses.

Main Methods:

Utilized miRNA-223-deficient mice to assess iNKT cell development and function.
Quantified iNKT cell populations in the thymus and peripheral organs.
Analyzed cytokine production from iNKT cells activated both in vivo and in vitro.

Main Results:

miR-223 deletion did not significantly impair iNKT cell development in the thymus.
Frequency and numbers of iNKT cells were normal in miR-223-deficient mice.
Cytokine production by activated iNKT cells showed no significant differences between knockout and wild-type mice.

Conclusions:

miR-223 is highly expressed in iNKT cells but is not essential for their development.
The absence of miR-223 does not affect iNKT cell function or immune response.
These findings suggest miR-223 is dispensable for iNKT cell biology.