1457 lines
110 KiB
Text
1457 lines
110 KiB
Text
<!DOCTYPE html>
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<html lang="en" dir="ltr" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# ">
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<head>
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<h1 class="nist-page__title">How Henrietta Lacks Changed My View of Human Cells as a Physicist</h1>
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<div class="daterange"><time datetime="2022-06-08T12:00:00Z">June 8, 2022</time>
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<a href="/blogs/taking-measure/authors/greta-babakhanova" hreflang="en">Greta Babakhanova</a>
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<img loading="lazy" src="/sites/default/files/styles/960_x_960_limit/public/images/2022/05/27/shutterstock_336230588.jpg?itok=Zuz6SB6i" width="960" height="596" alt="Colorized micrograph shows cells with pink centers and turquoise edges on a black background." typeof="foaf:Image" />
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<p>HeLa cells are stained with special dyes that highlight specific parts of each cell.</p>
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<div class="nist-image__credit">
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<span class="nist-image__credit-label">Credit:</span>
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Heiti Paves/Shutterstock
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<p>Physicists have a tendency of turning a complex problem into a simpler model that could be easily digested by mathematical equations or existing theories. Have you ever heard of “the spherical cow”? It’s a popular joke among scientists, but it captures how physicists often approach the objects they study. In short, it is easier to assume that a cow is a sphere since the calculations for a spherically shaped system are easier than those for a cow-shaped system. </p><p>Throughout my scientific career, I have dealt with idealized “spheres” like this. At the Jet Propulsion Laboratory in California, I was tasked with detecting near-Earth objects such as the Chelyabinsk meteor that exploded over the Russian city of the same name in 2013. In graduate school at Kent State in Ohio, we assumed that the rod-shaped liquid crystal molecules were cucumbers, which made it easier to visualize how they lined up next to each other. </p><p>Fast-forward to my current work at the National Institute of Standards and Technology (NIST), and now my “spheres” of interest are biological cells … of human origin. </p>
|
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<figure class=" align-right nist-image--lightbox nist-image" role="group">
|
||
<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2022/05/27/3DP_4942.png?itok=vZtRcSDV" data-media-id="644996">
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||
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||
<img alt="A researcher looks at a specialized microscope screen showing human cells from a flask below." height="480" loading="lazy" src="/sites/default/files/styles/480_x_480_limit/public/images/2022/05/27/3DP_4942.png?itok=QiUdtuie" typeof="foaf:Image" width="480">
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||
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||
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||
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||
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<figcaption class="nist-image__caption">Investigating the "living spheres" (human cells) in a 2D cell culture flask.<div class="nist-image__credit">
|
||
<span class="nist-image__credit-label">Credit:</span>
|
||
|
||
R. Wilson/NIST
|
||
|
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</div></figcaption>
|
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</figure>
|
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|
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<p>If it wasn’t for the book entitled <em>The Immortal Life of Henrietta Lacks</em> by Rebecca Skloot, I would forever look at biological cells through a lens of a physicist and would see nothing more than spherical objects during data acquisition or image analysis. This influential book introduced me to Henrietta Lacks’ story. </p><p>Lacks was a Black woman born in 1920 who was diagnosed with cervical cancer when she was 30. Treatments were unsuccessful, and she died at the age of 31. Though Lacks died more than 70 years ago, her cells are still alive today. Without her awareness or consent — a serious ethical problem that protocols are in place to stop today — researchers collected cells from her cancer. They then experimented on, stored and mass-produced these “HeLa” cells, and also shared them with other scientists. They became the first immortal human cells that were ever grown in culture, meaning they continued to reproduce endlessly in a petri dish, making a tissue culture that was continuously usable and testable for medical research purposes. Her cells have contributed to major scientific advances, and we owe a great debt to her and her family. </p><p>I don’t use HeLa cells in my work, but I do use cells from humans from whom consent has been obtained. Lacks’ story forever changed my perception of my experimental samples containing <em>living</em> spherical objects and made me realize their connection to real people, not just where the cells come from, but also whom my work affects.</p><p>One of the cells that I utilize in my research is called Jurkat Clone E6-1, derived from the Jurkat cell line, which was established in the late 1970s from the blood of a 14-year-old male with acute T-cell leukemia. By this time, donors (or their representatives such as family members) had gained the right to specify how to use their cells. The Jurkat cells that we have obtained can only be used for laboratory research, and not in medical treatments for example. But laboratory research with these cells can lead to broad advances in science and medicine. </p>
|
||
<figure class=" align-left nist-image--lightbox nist-image" role="group">
|
||
<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2022/05/27/3DP_4973.png?itok=aTaGxRFt" data-media-id="645001">
|
||
|
||
<img alt="A researcher works at a computer with the screen showing a black scaffold structure on a white background." height="480" loading="lazy" src="/sites/default/files/styles/480_x_480_limit/public/images/2022/05/27/3DP_4973.png?itok=azEmciZG" typeof="foaf:Image" width="480">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</div>
|
||
<figcaption class="nist-image__caption">Looking at cells in 3D scaffolds that mimic biological tissue.<div class="nist-image__credit">
|
||
<span class="nist-image__credit-label">Credit:</span>
|
||
|
||
R. Wilson/NIST
|
||
|
||
</div></figcaption>
|
||
</figure>
|
||
|
||
<p>Using these cells, collaborators and I are aiming to come up with a <a href="/programs-projects/quantitative-traceable-determination-cell-viability-using-absorbance-microscopy" data-entity-type="node" data-entity-uuid="d099af6e-8eac-442f-9192-0477f8075632" data-entity-substitution="canonical" title="Quantitative, Traceable Determination of Cell Viability Using Absorbance Microscopy">better way to measure the viability of a human cell</a>. Put simply, a viable cell is alive and able to function. </p><p>Cell viability is a critically important property for biotechnology applications, including the use of cells in medical therapies. Some medical therapies introduce live cells into the body, and in other cases, dead cells are used to evaluate therapies, so it is important to be able to detect the difference. Live and dead cell counts are used to evaluate cell growth, health and function, as well as to establish effective doses for therapeutic drugs. Biotech workers routinely evaluate cell viability to evaluate the manufacturing process and to ensure the quality and consistency of product batches for cell therapies. </p><p>Whether or not a cell is viable is determined by whether it has the following characteristics: an intact outer covering (membrane), the capacity to carry out life-sustaining chemical reactions (metabolism), and the ability to move, to reproduce or to react to stimuli. </p><p>Viability may sound like a qualitative property, one that is descriptive rather than numerical. But quantitative measurements can play a critical role in assessing this important property. The measurements we are developing can be linked, or traced back to, internationally recognized definitions of physical measurement units. In contrast, current cell viability methods lack such traceability and comparability, which become important, for example, when comparing results at different lab or manufacturing facilities or in the same facility at a later time. </p><p>We start by using one of the widely used methods for determining cell viability: pouring a blue dye called trypan blue on cells. Trypan blue penetrates and stains dead cells with ruptured membranes. Viable cells with intact cell membranes, however, are impermeable to trypan blue and remain unstained. </p>
|
||
<figure class=" align-center nist-image--lightbox nist-image" role="group">
|
||
<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2022/06/03/Absorbance_press_image_caption.png?itok=z5ivm2t9" data-media-id="645276">
|
||
|
||
<img alt="Three micrographs in a row showing round cells are labeled Intensity, Absorbance and Moles. " height="308" loading="lazy" src="/sites/default/files/images/2022/06/03/Absorbance_press_image_caption.png" typeof="foaf:Image" width="1241">
|
||
|
||
|
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|
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|
||
<figcaption class="nist-image__caption">The images show a 50:50 mixture of live and dead Jurkat cells that were stained with trypan blue (TB) dye. TB stains cells that have a leaky membrane (dead) whereas cells with intact cell membranes remain unstained (live). In the “Intensity Image,” dead cells appear dark (filled arrowhead) and live cells appear light (open arrowhead). The “Absorbance Image” and “Moles Image” were generated from the brightfield “Intensity Image” to determine the moles of TB inside each cell as a quantitative, traceable measure of their viability. All three images are the same field of view.<div class="nist-image__credit">
|
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<span class="nist-image__credit-label">Credit:</span>
|
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|
||
NIST
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</div></figcaption>
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</figure>
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|
||
<p>We use a microscope to capture images of Jurkat cells and then look at each pixel of the image to measure how much light the cell absorbs due to the dye. Since we know the absorbance properties of the dye, we can then determine the number of trypan molecules that absorb light. The number of molecules that absorb light can be expressed in moles, which is a unit of the International System of Units (SI). In this way, absorbance imaging enables traceable and comparable live and dead cell classifications. What’s more, as we found, dead cells can absorb different amounts of dye depending on the method that was used to kill them. </p><p>Together with our collaborators, we hope our methods for quantitative viability assessments in 2D and 3D cell cultures will accelerate the development of biological products for human use and advance the field of regenerative medicine, in which diseased cells, tissues or organs are repaired or replaced. </p><p>And thanks to the book about Henrietta Lacks, I have a whole different kind of appreciation for my samples. I now realize that behind each “spherical cow” that I study in the lab existed a person who was kind enough to donate a piece of themselves for the sake of scientific advances. We no longer know whose cells we are exploring as the personal identity is not disclosed, but in my mind, I respectfully thank the donor when I am handling their samples.</p>
|
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<a href="/blogs/taking-measure/categories/248321">Bioscience</a>,
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|
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|
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|
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|
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<div class="nist-teaser__content">
|
||
<div class="text-with-summary"><p>Greta Babakhanova is a physicist in the Biomaterials Group of the Biosystems and Biomaterials Division at the National Institute of Standards and Technology in Gaithersburg, Maryland. Her background is in soft matter physics and imaging. Her current research focuses on quantitative and nondestructive cell viability measurements in two- and three-dimensional structures that mimic biological tissue for tissue engineered medical products.</p></div>
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<span class="nist-comment__author"><span lang="" typeof="schema:Person" property="schema:name" datatype="">Vuong </span></span>
|
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on
|
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<span class="nist-comment__date">September 10, 2023 2:48 AM</span>
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<mark class="hidden nist-comment__new" data-comment-timestamp="1694444870"></mark>
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<div class="text-long"><p>Physics is very important</p>
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<article data-comment-user-id="0" id="comment-154496" class="nist-comment js-comment">
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<span class="nist-comment__author"><span lang="" typeof="schema:Person" property="schema:name" datatype="">Cytion</span></span>
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on
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<span class="nist-comment__date">May 13, 2024 3:02 AM</span>
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<div class="nist-comment__content">
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<div class="text-long"><p>Reading about Henrietta Lacks' impact on human cell research transformed my perspective as a physicist. Her legacy is truly inspiring.</p>
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