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Neural Stem Cells vs. Neuronal Stem Cells? Definitions and Explanation.

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Have you been questioning the meaning of the terms neural stem cells versus neuronal stem cells? If so, you’re not alone. The short answer is that neural means pertaining to a nerve or nerves (the cordlike bundles of fibers made up of neurons), while neuronal means pertaining to neurons (the conducting cells of the nervous system).

With this understanding, the term neural stem cell describes multipotent stem cells that can self-renew and differentiate into specialized cells of the brain, such as neurons, astrocytes, or oligodendrocytes.

In contrast, neuronal is a term that describes neurons, so practically speaking, it is often used in the context of describing neuronal networks (networks of neurons) or describing neuronal differentiation. For example, one might talk about stem cell-derived neuronal networks or neuronal differentiation of induced pluripotent stem cells (iPS cells).

Therefore, when it comes to the world of stem cells, the cells that are capable of differentiating into specialized cells of the brain are neural stem cells.

With this surface level understanding, let’s dive deeper.

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Do You Know The 5 Types Of Stem Cells?

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As you start to learn about stem cells, one of the most common questions to have is, “What types of stem cells exist?” There is not an agreed-upon number of stem cell types, because one can classify stem cells either by differentiation potential (what they can turn into) or by origin (from where they are sourced). This post is dedicated to explaining the five types of stem cells, based on differentiation potential.

5 Types of Stem Cells by Differentiation Potential

The five different types of stem cells discussed in this article are:

All stem cells that exist can be classified into one of five groups based on their differentiation potential. Each of these stem cell types is explored in greater detail below.

1. Totipotent (or Omnipotent) Stem Cells

These stem cells are the most powerful that exist.

They can differentiate into embryonic, as well as extra-embryonic tissues, such as chorion, yolk sac, amnion, and the allantois. In humans and other placental animals, these tissues form the placenta.

The most important characteristic of a totipotent cell is that it can generate a fully-functional, living organism.

The best-known example of a totipotent cell is a fertilized egg (formed when a sperm and egg unite to form a zygote).

It is at or around four days post-fertilization that these cells begin to specialize into pluripotent cells, which as described below are flexible cell types, but cannot produce an entire organism. 

2. Pluripotent Stem Cells

The next most powerful type of stem cell is the pluripotent stem cell.

The importance of this cell type is that it can self-renew and differentiate into any of the three germ layers, which are: ectoderm, endoderm, and mesoderm. These three germ layers further differentiate to form all tissues and organs within a human being.

There are several known types of pluripotent stem cells. Among the natural pluripotent stem cells, embryonic stem cells are the best example. Embryonic stem cells are unique cells that exist in an early-stage embryo.

Another a type of “human-made” pluripotent stem cell also exists, which is the induced pluripotent stem cell (iPS cell). iPS cells were first produced from mouse cells in 2006 and human cells in 2007, and are tissue-specific cells that can be reprogrammed to become functionally similar to embryonic stem cells.

Because of their powerful ability to differentiate in a wide diversity of tissues and their non-controversial nature, induced pluripotent stem cells are well-suited for use in cellular therapy and regenerative medicine.

3. Multipotent Stem Cells

Multipotent stem cells are a middle-range type of stem cell, in that they can self-renew and differentiate into a specific range of cell types.

An excellent example of this cell type is the mesenchymal stem cell (MSC).

Mesenchymal stem cells can differentiate into osteoblasts (a type of bone cell), myocytes (muscle cells), adipocytes (fat cells), and chondrocytes (cartilage cells).

These cells types are fairly diverse in their characteristics, which is why mesenchymal stem cells are classified as multipotent stem cells.

4. Oligopotent Cells

The next type of stem cells, oligopotent cells, are similar to the prior category (multipotent stem cells), but they become further restricted in their capacity to differentiate.

While these cells can self-renew and differentiate, they can only do so to a limited extent. They can only do so into closely related cell types.

An excellent example of this cell type is the hematopoietic stem cell (HSC).

HSCs are cells derived from mesoderm that can differentiate into other blood cells. Specifically, HSCs are oligopotent stem cells that can differentiate into both myeloid and lymphoid cells.

Myeloid cells include basophils, dendritic cells, eosinophils, erythrocytes, macrophages, megakaryocytes, monocytes, neutrophils, and platelets, while lymphoid cells include B cells, T cells, and natural kills cells.

5. Unipotent Stem Cells

Finally, we have the unipotent stem cells, which are the least potent and most limited type of stem cell.

An example of this stem cell type are muscle stem cells.

While muscle stem cells can self-renew and differentiate, they can only do so into a single cell type. They are unidirectional in their differentiation capacity.

Classifying the Stem Cell Types

The purpose of these stem cell categories is to assess the functional capacity of stem cells based on their differentiation potential.

Importantly, each category has different stem cell research applications, medical applications, and drug development applications.

Different Types of Stem Cells | Do You Know The 5 Types Of Stem Cells

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Top 5 TED Talks About Stem Cells

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Check out the best TED Talks below to understand the growing importance of stem cells within regenerative medicine.

In this article:

  1. What Are TED Talks?
  2. TED Talks Topics: Stem Cells
  3. Criteria for Choosing the Top 5 TED Talks Topics About Stem Cells
  4. Top 5 Most Inspiring TED Talks About Stem Cells

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Gladstone Institutes Initiates Research Collaboration With Eli Lilly for Neurodegenerative Diseases

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Study will use innovative technology to focus on neurodegenerative diseases

Gladstone and Eli Lilly
Steve Finkbeiner, M.D., Ph.D., Senior Investigator, Gladstone Institute of Neurological Disease

SAN FRANCISCO, December 7, 2017 (Newswire.com) – The Gladstone Institutes announced today a new research collaboration with Eli Lilly and Company focused on neurodegenerative diseases. This multi-year, milestone-driven project will be based on a combination of innovative technologies developed at Gladstone by Steve Finkbeiner, M.D., Ph.D. His laboratory will work closely with Lilly during this collaboration.

“This collaboration has high potential to open new avenues towards effective therapies for neurodegenerative diseases,” said Gladstone President R. Sanders Williams, M.D. “Both organizations are committed to meeting this major unmet need.”

Key to the project is a robotic microscope system developed in Finkbeiner’s laboratory with funds from Gladstone, the Taube/Koret Center for Neurodegenerative Disease Research, and the ALS Association. This fully automated platform allows scientists to track thousands of individual cells for days or weeks at a time, and follow discrete cellular functions.

When coupled with neurons generated from induced pluripotent stem cells collected from patients with neurodegenerative diseases, such as Alzheimer’s disease, Parkinson’s disease, Huntington’s disease, and ALS, this microscope becomes a powerful tool to study the cells and their responses to disease and treatments. [Read more…]

Fortuna Fix Announces Series B Financing, Adding Amgen Ventures and Macnguyen Family Office as Shareholders

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London, UK and Montreal, Canada, November 8, 2017 (Newswire) –Fortuna Fix (“Fortuna”), a private, clinical-stage Regenerative Medicine company is aiming to be the first to bring to the clinic a patient’s own neural stem cells (autologous) produced by direct reprogramming (“drNPCs”) to replace lost neuronal tissue in neurodegeneration and neurotrauma.
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