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Shapeshifters Within: Solving the 150-Year-Old Puzzle of Cell Nuclei’s Enigmatic Shapes

February 14, 2024
in Science
Shapeshifters Within: Solving the 150-Year-Old Puzzle of Cell Nuclei’s Enigmatic Shapes
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Neutrophil White Blood Cell Illustration

A groundbreaking study reveals how neutrophils form their unique nuclear structures, solving a mystery from the 1880s. This discovery could revolutionize immune therapy by enabling the engineering of immune cells with new nuclear shapes to enhance their disease-fighting capabilities.

Scientists may be able to direct immune cells toward diseased areas. Nearly 150 years ago, scientists discovered that specialized blood cells serve a vital role in immune system protection against infection and illness.

Certain groups of these white blood cells, now known as neutrophils, feature a nucleus that is structured strikingly different than most nuclei. The majority of cells feature round- or oval-shaped nuclei that are rigid, but neutrophils differ in that their nuclei adopt multiple lobular structures akin to that of flower petal arrangements.

Unique Nuclear Structures

These unique nuclear shapes permit neutrophils to travel all over the body to identify and combat invading pathogens. While much is now known about the role of neutrophils in combatting infection, how such peculiar nuclear structures are assembled has remained enigmatic since the 1880s.

Bone Marrow Neutrophils

Neutrophils, blood cells that serve as a first-response to invading bacteria, feature nuclei that — rather than being uniformly round as most other cells — are divided into multiple petals or lobes, allowing them to migrate into densely populated tissues. Here they are shown in human bone marrow (purple cells) in the company of many red blood cells. Credit: Dr. Huan-You Wang

Breakthrough in Understanding

Reporting in Nature, University of California San Diego School of Biological Sciences Postdoctoral Scholar Indumathi Patta and Professor Cornelis Murre, in collaboration with Dr. Ming Hu at the Cleveland Clinic Foundation, have deciphered the shapeshifting puzzle of the neutrophil nucleus.

“We now know how these nuclear shapes are assembled and it’s a beautiful process,” said Murre, a distinguished professor in the Department of Molecular Biology.

Indumathi Patta

UC School of Biological Sciences Postdoctoral Scholar Indumathi Patta. Credit: UC San Diego

Mechanism Unveiled

Using a combination of ancient staining procedures combined with advanced techniques, named chromosome-conformation-capture studies, the researchers unveiled how flower-like nuclei are assembled. While chromosomes of rounded cells fold into stacked bundles of DNA loops, neutrophil genomes lack such loops. Remarkably, when the researchers removed chromatin loops, progenitor cells swiftly converted round nuclear shapes into flower petal arrangements like those found in neutrophils. This simple conversion also sufficed to activate thousands of genes associated with an inflammatory gene program that allows neutrophils to combat invading bacteria.

After unveiling the neutrophil loop assembly question, the researchers now believe they have the instructions to guide the development of new nuclear shapes.

Indumathi Patta and Cornelis Murre

UC School of Biological Sciences Postdoctoral Scholar Indumathi Patta and Professor Cornelis Murre. Credit: UC San Diego

Implications for Immune Therapeutics

“This potentially opens an exciting new chapter in immune therapeutics since theoretically, it should be possible to change the nuclear structure of killer immune cells so that they can more easily invade complex, solid environments, such as tumors,” said Murre. “Essentially, this could lead to engineering novel nuclear shapes in effector immune cells, which is a new concept in therapeutics development.”

Reference: “Nuclear morphology is shaped by loop extrusion programs” 14 February 2024, Nature.
DOI: 10.1038/s41586-024-07086-9

The authors of the study include: Indumathi Patta, Maryam Zand, Lindsay Lee, Shreya Mishra, Alexandra Bortnick, Hanbin Lu, Arpita Prusty, Sara McArdle, Zbigniew Mikulski, Huan-You Wang, Christine Cheng, Kathleen Fisch, Ming Hu and Cornelis Murre.

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/shapeshifters-within-solving-the-150-year-old-puzzle-of-cell-nucleis-enigmatic-shapes/

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