What Are Stem Cells?

Adult Stem Cells

Adult stem cells are found in various tissues after birth and play an important role in tissue maintenance and repair. Unlike embryonic stem cells, they are obtained from developed tissues such as bone marrow, adipose tissue, peripheral blood, and other sources.

Bone marrow is one of the established sources of adult stem cells and is located within certain bones. Depending on the cellular technology and clinical application, different cell populations can be isolated and studied, including hematopoietic stem cells, mesenchymal stromal cells, and endothelial-related progenitor cells.

Mesenchymal stromal cells are particularly studied for their ability to interact with surrounding tissues through cellular signaling and to differentiate into certain cell types under appropriate biological conditions. Their potential applications continue to be investigated in regenerative and cellular medicine.

1. SVF – Stromal Vascular Fraction

Stromal Vascular Fraction (SVF) is a heterogeneous cell population obtained from adipose tissue. Through controlled enzymatic or mechanical processing, adipose tissue can be separated into different cellular and non-cellular components, resulting in an SVF preparation containing multiple cell populations.

Depending on the preparation method, SVF may contain adipose-derived stromal/stem cells, endothelial cells, pericytes, immune cells, fibroblasts, and other cellular components.

These cells and supporting factors are being studied for their potential role in tissue repair, cellular signaling, angiogenesis, and modulation of inflammatory processes.

SVF is an area of research within regenerative medicine, and its use depends on the specific clinical application, processing method, regulatory requirements, and medical assessment.

2. Mesenchymal Stem Cells

Mesenchymal stem cells (MSCs), also commonly referred to as mesenchymal stromal cells, are multipotent cells found in several tissues, including bone marrow and adipose tissue.

MSCs are extensively studied because of their ability to interact with surrounding cells and release biologically active signaling molecules. Under specific laboratory conditions, they can differentiate into certain cell types, particularly cells associated with connective tissues.

Characteristics of Mesenchymal Stem Cells

• They can differentiate into certain specialized cell types under appropriate conditions.

• Their biological behavior can vary depending on their tissue source and surrounding environment.

• They communicate with surrounding cells through a range of signaling molecules and extracellular vesicles.

• They are being studied for their potential role in tissue support, immune modulation, and regenerative processes.

• Their potential applications include research into bone, cartilage, muscle, tendon, and other connective tissues.

When larger quantities of MSCs are required for research or specific cellular applications, cells may be expanded under controlled laboratory conditions. Such processes require specialized facilities, quality control, and appropriate manufacturing standards, including GMP requirements where applicable.

3. Hematopoietic Stem Cells (Blood-Forming Stem Cells)

Hematopoietic stem cells (HSCs) are blood-forming stem cells responsible for generating the different types of blood cells throughout the body.

They are primarily found in bone marrow and can also be obtained from peripheral blood and umbilical cord blood. Hematopoietic stem cell transplantation is one of the most established clinical applications of stem cell medicine.

Functions of Hematopoietic Stem Cells

• Generate red blood cells, white blood cells, and platelets.

• Support the continuous production and renewal of blood cells.

• Play a central role in maintaining the body's blood and immune systems.

• Are used clinically in the treatment of certain blood cancers and disorders affecting the blood-forming system.

Established applications include conditions such as leukemia, lymphoma, multiple myeloma, aplastic anemia, thalassemia, and certain inherited or acquired disorders of the hematopoietic system.

4. Endothelial Stem Cells

Endothelial progenitor cells are a population of cells associated with the development and maintenance of blood vessels. They can circulate in the bloodstream and may be involved in processes related to vascular repair and new blood vessel formation.

Research is investigating their potential role in angiogenesis, vascular regeneration, and the body's response to vascular injury.

Their biological functions and therapeutic potential continue to be studied within regenerative and cardiovascular medicine.

5. Autologous Stem Cell Production

Autologous cell therapy refers to the use of cells obtained from the same patient who will receive the treatment. Depending on the specific application, cells may be collected, processed, and, where permitted and clinically appropriate, prepared for administration back to the patient.

The type of cell, processing method, laboratory requirements, and clinical application depend on the individual treatment protocol.

Examples of Cells Used in Autologous Cell-Based Approaches

Fibroblast Cells

Fibroblasts are connective-tissue cells that play an important role in producing collagen and other components of the extracellular matrix. Autologous fibroblast-based approaches have been investigated in aesthetic and dermatological applications, including skin rejuvenation.

Beta Cells

Beta cells are specialized pancreatic cells responsible for producing insulin. Cell replacement strategies involving insulin-producing cells are an active area of research for diabetes, particularly type 1 diabetes. These approaches are being investigated to restore or supplement insulin-producing cell function.

Keratinocytes

Keratinocytes are the predominant cells of the epidermis, the outermost layer of the skin. Cultured keratinocytes and engineered skin technologies have been studied and used in certain applications involving burns, extensive skin injuries, and other conditions requiring skin reconstruction.

At You Stemcell, cellular technologies are considered according to the patient's condition, medical history, treatment goals, and the applicable medical and regulatory framework.