Stem cells and tissue renewal: labile, stable and permanent tissues !

Process

Some tissues renew themselves all the time, some only after injury, and some almost never. Stem cells make the difference.

Updated 2026-11-01

What it is

Stem cells divide to renew themselves and to produce cells that differentiate, usually through rapidly dividing transit-amplifying cells. Tissues are grouped by how much their cells divide: labile (constant renewal), stable (quiescent but able to divide after injury) and permanent (little or no division). This explains why the gut lining heals in days, the liver can regrow, and a heart attack or stroke leaves a scar.

Key facts

Potency: totipotent (zygote and first blastomeres) > pluripotent (inner cell mass, embryonic stem cells) > multipotent (adult stem cells such as hematopoietic) > unipotent.
Adult stem cells sit in niches: intestinal crypt bases, the bulge of the hair follicle and the basal epidermis, the limbus of the cornea, bone marrow.
Induced pluripotent stem cells are adult cells reprogrammed in the laboratory to a pluripotent state.

Step by step

A stem cell in its niche divides asymmetrically: one daughter stays a stem cell.
The other becomes a transit-amplifying cell that divides several times.
Its progeny stop dividing and differentiate as they move away from the niche.
Mature cells work, then die by apoptosis or are shed and replaced.

Labile, stable and permanent tissues

Group	Cell cycle	Examples	After injury
Labile	Divide continuously from stem cells	Epidermis, gut and cervical epithelium, bone marrow, urothelium	Full regeneration if the stem cell layer and basement membrane survive
Stable	Resting (G0), re-enter the cycle when stimulated	Hepatocytes, renal tubular cells, fibroblasts, endothelium, smooth muscle	Regenerate if the framework is intact; otherwise fibrosis
Permanent	Left the cycle for good	Neurons, cardiac muscle cells; skeletal muscle only through satellite cells	Healing by scar (gliosis in the brain, fibrosis in the heart)

Markers

Ki-67 (dividing cells)
CD34 (hematopoietic stem and progenitor cells)
LGR5 (intestinal crypt stem cells)

Clinical notes

Chemotherapy and radiation hurt labile tissues first: mucositis, diarrhoea, hair loss and low blood counts.
Liver cirrhosis: when injury destroys the reticulin framework, hepatocytes regenerate in disordered nodules ringed by fibrosis.
Myocardial infarction and ischaemic stroke heal with scar because cardiomyocytes and neurons are permanent.
Hematopoietic stem cell transplant uses the multipotent marrow stem cell to rebuild all blood lines.

Test yourself

Think of the answer, then tap the question to see it.

Are hepatocytes labile, stable or permanent?

Stable: they rest in G0 but re-enter the cell cycle after loss of liver tissue, which is why the liver can regrow.

Why does a myocardial infarction heal with a scar?

Cardiac muscle cells are permanent and do not divide meaningfully, so dead muscle is replaced by fibrous tissue.

What is a transit-amplifying cell?

The daughter of a stem cell that divides rapidly a limited number of times before its progeny differentiate.

Why do chemotherapy side effects show up in the mouth, gut, hair and blood?

Those are labile tissues with constantly dividing cells, the cells most vulnerable to drugs that target division.

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Educational content on normal microscopic structure and its clinical relevance; no substitute for studying slides or for a health professional's advice.

Sources: 3.6 Cellular Differentiation (OpenStax (Rice University), 2022); 4.6 Tissue Injury and Aging (OpenStax (Rice University), 2022).

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Representative model, for educational purposes only.