Researchers discovered that the neuropeptide Substance P and its NK-1 receptor are present in adipose stem cells and can stimulate their growth.
First demonstration in ADSCsSubstance P and NK-1 receptor had never before been identified in adipose-derived stem cells despite being known in many other cell types
What the researchers found
For the first time, researchers demonstrated the presence and localization of Substance P (SP) and its receptor NK-1R in both human and rat adipose-derived stem cells (ADSCs). Using immunofluorescence, they showed that SP and NK1R are present in both the cytoplasm and nucleus of ADSCs, with NK1R levels being higher in the nucleus. Western blot analysis revealed different NK1R isoforms with distinct subcellular locations. Critically, SP was shown to induce proliferation and mitogenesis in ADSCs through the NK1R pathway.
Why it matters
Adipose stem cells are widely used in regenerative medicine and tissue engineering. Discovering that Substance P and its receptor are present and functionally active in these cells opens new avenues for understanding how neuropeptides regulate stem cell behavior, potentially leading to better methods for controlling stem cell growth and differentiation in therapeutic applications.
The numbers in context
NK1R higher in nucleus than cytoplasm · multiple NK1R isoforms identified · SP induces proliferation via NK1R · human and rat ADSCs tested
How the study worked
Laboratory study using human and rat adipose-derived stem cells. Researchers used immunofluorescence microscopy to visualize the location of Substance P and NK-1 receptor within the cells, and Western blot analysis to identify different receptor isoforms and their subcellular distribution. Proliferation and mitogenesis assays were used to test functional effects of SP on ADSCs.
Who was studied
Human and rat adipose-derived stem cells (in vitro laboratory study)
What this study cannot tell us
This is a laboratory study using cells in culture, so the findings may not directly translate to how Substance P affects adipose stem cells in a living organism. The abstract does not provide quantitative data on proliferation rates or statistical significance of the mitogenesis findings. The study used a relatively basic set of techniques without exploring downstream signaling pathways in depth.
How to read the evidence
This is a basic science laboratory study providing the first evidence of SP/NK1R in adipose stem cells. While the finding is novel, it is limited to in vitro cell culture work and requires replication and in vivo confirmation.
When this study was published
Published in 2017, this foundational finding remains relevant as adipose stem cell research continues to expand and neuropeptide biology in stem cells is still being explored.
The bigger picture
Fat-derived stem cells are among the most accessible and commonly used stem cells in regenerative medicine. Understanding that neuropeptides like Substance P can regulate their behavior adds a new layer of biological complexity and could inform strategies to enhance stem cell therapies for tissue repair and wound healing.
Questions still open
- Does Substance P signaling through NK1R in adipose stem cells play a role in wound healing or tissue repair in living organisms?
- Could blocking or activating the NK1R pathway be used to control adipose stem cell growth in therapeutic settings?
- Do other neuropeptides from the tachykinin family have similar effects on adipose stem cells?
Common questions
What is Substance P and why is it important?
Why does finding Substance P in fat stem cells matter for medicine?
Read the original research
Immunolocalization of Substance P and NK-1 Receptor in ADIPOSE Stem Cells.
Journal of cellular biochemistry, 118(12), 4686-4696
Citation
Muñoz, Miguel; Muñoz, Mario F; Ayala, Antonio. (2017). Immunolocalization of Substance P and NK-1 Receptor in ADIPOSE Stem Cells.. Journal of cellular biochemistry, 118(12), 4686-4696. https://doi.org/10.1002/jcb.26134