Paper reading: Capsaicin diet drives gut inflammation and exosomal miR-17-3p elevation in idiopathic short stature

Sun, 18 Jan 2026 00:00:00 +0000

#paper information

Title: Capsaicin diet drives gut inflammation and exosomal miR-17-3p elevation in idiopathic short stature Journal: Nature Communications Year: 2025 Date: 2025-12-30

Research background

Idiopathic Short Stature (ISS) refers to a condition in which the height is two standard deviations lower than the person of the same age, but growth hormone (GH) levels are normal and there is no obvious pathological cause. The cause of ISS has long been a mystery.

Although genetics is the main factor in determining height, the influence of environmental factors such as diet cannot be ignored. Past research has mostly focused on nutritional deficiencies (such as calcium, protein), but how specific dietary components affect bone growth through molecular mechanisms is still poorly understood. This study focuses on capsaicin, the main component of spicy food, and explores whether and how it affects children’s growth and development.

Research methods

The research team adopted a systematic approach from clinical correlation analysis to molecular mechanism verification:

Clinical correlation analysis: Analyze the relationship between children’s eating habits and height, especially the intake of capsaicin.
Animal model: Establish a rat model of long-term ingestion of capsaicin and observe its effects on body length, femur length and growth plate structure.
Exosome tracking: Isolate exosomes (Exosomes) in serum, analyze their miRNA content, and track whether these exosomes can reach the bone growth plate.
Molecular mechanism exploration: Verify the regulatory effect of candidate miRNA on growth signaling pathways (such as ZNF148/SOS1/RAS/ERK and PI3K/AKT) in chondrocytes cultured in vitro.

Main findings

1. Capsaicin intake causes growth retardation and intestinal inflammation

In animal experiments, rats that long-term consumed a diet rich in capsaicin had significantly lower body weight and length than those in the control group. Histological examination found that these rats had thinner growth plates** and reduced new bone formation. At the same time, these rats showed significant intestinal inflammation. Notably, their growth hormone (GH) and insulin-like growth factor-1 (IGF-1) levels were normal, fully consistent with the clinical features of ISS.

2. Exosomal miR-17-3p is a key messenger

The study found that capsaicin-induced intestinal inflammation led to a significant increase in the levels of miR-17-3p carried by exosomes in the serum. These exosomes act as “long-range messengers” and are transported from the intestine to the growth plate cartilage of the bone.

3. Molecular mechanism: inhibiting chondrocyte proliferation

After reaching the growth plate, miR-17-3p enters chondrocytes, targeting and inhibiting the expression of the ZNF148 gene. Downregulation of ZNF148 further blocked SOS1 and the downstream RAS/ERK and PI3K/AKT signaling pathways. These pathways are critical for chondrocyte proliferation and hypertrophy, key processes in longitudinal bone growth. Therefore, inhibition of this pathway directly results in stunted bone growth.

Research significance

1. Revealed the new mechanism of the “gut-bone axis”

This study established a specific “diet-intestinal inflammation-exosomes-bone growth” cross-organ regulation model, proving that intestinal microorganisms and inflammatory status can directly affect the development of distal organs (bones) through non-hormonal pathways (exosomal miRNAs).

2. Provides a new etiological explanation for ISS

For many short children with normal growth hormone levels, this study offers a possible explanation: Perhaps it’s not a lack of hormones, but chronic inflammatory signals triggered by specific dietary habits that inhibit the bone’s response to growth.

3. Potential therapeutic targets

The findings suggest that, in addition to growth hormone therapy, intervention targeting miR-17-3p (such as the use of antisense oligonucleotides) or improving intestinal inflammation may become a new strategy for the treatment of some children with ISS. Of course, the simplest advice may be this: Avoid excessive consumption of spicy foods in developing children.

My understanding

1. Molecular-level interpretation of “You are what you eat”

This statement is usually understood to mean that nutrients make up body tissues. But the study shows a deeper meaning: Food is not just fuel, it’s a signal. Capsaicin itself is not a component of bone, but the biological response it triggers (inflammation -> release of exosomes) is like an “instruction” that rewrites the growth program of bone cells.

2. Growth hormone is not a panacea

When encountering children with ISS clinically, parents often anxiously seek growth hormone injections. However, if the cause is that the downstream cell signaling pathway is “stuck” by inflammatory factors (such as miR-17-3p), simply increasing the upstream growth hormone may have limited effect. This reminds us that medicine needs to shift from “replenishing deficiency” to “relieving inhibition.”

3. The collision of traditional wisdom and modern science

There is a saying in many cultures that “children who eat too much spicy food will not grow taller” (although it is more about eating spicy food that will “get angry” or affect digestion). This study unexpectedly provides rigorous molecular biology evidence for this folk observation. It reminds us that in developmental biology, gut health and systemic immune status may be more critical than we thought.

(Note: Please search for the paper published by Wang et al. in the December 2025 issue)

Reading date: 2026-01-18 Notes organized: Dylan Chiang

Nutrition | Dylan Chiang