The DOI matches its Crossref record; 42 of the 42 references it cites were found in a registry or an index.
FNDC5/Irisin Is Not Only a Myokine but Also an Adipokine
Open accessAbstract
Exercise provides clear beneficial effects for the prevention of numerous diseases. However, many of the molecular events responsible for the curative and protective role of exercise remain elusive. The recent discovery of FNDC5/irisin protein that is liberated by muscle tissue in response to exercise might be an important finding with regard to this unsolved mechanism. The most striking aspect of this myokine is its alleged capacity to drive brown-fat development of white fat and thermogenesis. However, the nature and secretion form of this new protein is controversial. The present study reveals that rat skeletal muscle secretes a 25 kDa form of FNDC5, while the 12 kDa/irisin theoretical peptide was not detected. More importantly, this study is the first to reveal that white adipose tissue (WAT) also secretes FNDC5; hence, it may also behave as an adipokine. Our data using rat adipose tissue explants secretomes proves that visceral adipose tissue (VAT), and especially subcutaneous adipose tissue (SAT), express and secrete FNDC5. We also show that short-term periods of endurance exercise training induced FNDC5 secretion by SAT and VAT. Moreover, we observed that WAT significantly reduced FNDC5 secretion in fasting animals. Interestingly, WAT of obese animals over-secreted this hormone, which might suggest a type of resistance. Because 72% of circulating FNDC5/irisin was previously attributed to muscle secretion, our findings suggest a muscle-adipose tissue crosstalk through a regulatory feedback mechanism.
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“However, it is important to note that irisin is not a protein exclusively secreted by muscle tissue.”
From Physical Exercise-Induced Myokines and Muscle-Adipose Tissue Crosstalk: A Review of Current Knowledge and the Implications for Health and Metabolic Diseases (2018) · cites this paper as Roca-Rivada et al., 2013
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“He also found that both tissues secreted FNDC5/irisin under the stimulus of endurance training.”
From Physical Exercise-Induced Myokines and Muscle-Adipose Tissue Crosstalk: A Review of Current Knowledge and the Implications for Health and Metabolic Diseases (2018) · cites this paper as Roca-Rivada et al., 2013
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“The study presented by Arturo Roca-Rivada et al. was a pioneer in showing that WAT also secretes FNDC5, the precursor of irisin, indicating that it is not only a myokine but also an adipokine (Roca-Rivada et al., 2013).”
From Physical Exercise-Induced Myokines and Muscle-Adipose Tissue Crosstalk: A Review of Current Knowledge and the Implications for Health and Metabolic Diseases (2018) · cites this paper as Roca-Rivada et al., 2013
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“Furthermore, the secretion of FNDC-5 is around 40% higher in slow-oxidative fibre-type muscle (i.e. soleus) than in fast-glycolytic fibre-type muscle (i.e. gastrocnemius) [47].”
In the citing paper
“Irisin is mainly secreted by skeletal muscle cells, although some secretion was also reported in WAT [204] and, to a lesser extent, in BAT [204,205].”
From Mitochondrial Uncoupling: A Key Controller of Biological Processes in Physiology and Diseases (2019) · cites this paper as [204]
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1 retracted
Wenz, T., Rossi, S. G., Rotundo, R. L., Spiegelman, B. M., & Moraes, C. T. (2009) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0911570106 · Cited by 600
RetractedA PGC1-α-dependent myokine that drives brown-fat-like development of white fat and thermogenesis
Boström, P., Wu, J., Jedrychowski, M. P., Korde, A., Ye, L., Lo, J. C., Rasbach, K. A., Boström, E. A., Choi, J. H., Long, J. Z., et al. (2012) · Nature · doi:10.1038/nature10777 · Cited by 4,810
Identification and Importance of Brown Adipose Tissue in Adult Humans
Cypess, A. M., Lehman, S., Williams, G., Tal, I., Rodman, D., Goldfine, A. B., Kuo, F. C., Palmer, E. L., Tseng, Y.-H., Doria, A., et al. (2009) · New England Journal of Medicine · doi:10.1056/nejmoa0810780 · Cited by 4,399
A Cold-Inducible Coactivator of Nuclear Receptors Linked to Adaptive Thermogenesis
Puigserver, P., Wu, Z., Park, C. W., Graves, R., Wright, M., & Spiegelman, B. M. (1998) · Cell · doi:10.1016/s0092-8674(00)81410-5 · Cited by 3,864
Functional Brown Adipose Tissue in Healthy Adults
Virtanen, K. A., Lidell, M. E., Orava, J., Heglind, M., Westergren, R., Niemi, T., Taittonen, M., Laine, J., Savisto, N.-J., Enerbäck, S., et al. (2009) · New England Journal of Medicine · doi:10.1056/nejmoa0808949 · Cited by 3,058
Muscles, exercise and obesity: skeletal muscle as a secretory organ
Pedersen, B. K., & Febbraio, M. A. (2012) · Nature Reviews Endocrinology · doi:10.1038/nrendo.2012.49 · Cited by 2,909
Muscle as an Endocrine Organ: Focus on Muscle-Derived Interleukin-6
Pedersen, B. K., & Febbraio, M. A. (2008) · Physiological Reviews · doi:10.1152/physrev.90100.2007 · Cited by 2,388
Subcutaneous and visceral adipose tissue: Structural and functional differences
Ibrahim, M. M. (2010) · Obesity Reviews · doi:10.1111/j.1467-789x.2009.00623.x · Cited by 2,238
High Incidence of Metabolically Active Brown Adipose Tissue in Healthy Adult Humans
Saito, M., Okamatsu-Ogura, Y., Matsushita, M., Watanabe, K., Yoneshiro, T., Nio-Kobayashi, J., Iwanaga, T., Miyagawa, M., Kameya, T., Nakada, K., et al. (2009) · Diabetes · doi:10.2337/db09-0530 · Cited by 1,848
Unexpected evidence for active brown adipose tissue in adult humans
Nedergaard, J., Bengtsson, T., & Cannon, B. (2007) · American Journal of Physiology-Endocrinology and Metabolism · doi:10.1152/ajpendo.00691.2006 · Cited by 1,824
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Additional file 1 of Irisin deletion induces a decrease in growth and fertility in mice
Luo, Y., Qiao, X., Ma, Y., Deng, H., Xu, C. C., & Xu, L. (2021) · Figshare · doi:10.6084/m9.figshare.14006152
Association of circulating muscle-derived myokines irisin and myostatin with COVID-19 severity
Daroszewski, C., Grzegrzółka, J., Kosacka, M., & Brzecka, A. (2026) · Frontiers in Endocrinology · doi:10.3389/fendo.2025.1668035
Kamath, P. U., Golamari, U. R., Nair, A. S., & Kalra, P. (2026) · Indian Journal of Endocrinology and Metabolism · doi:10.4103/ijem.ijem_631_25
Gupta, S., Jaiswal, N., Banerjee, S., & Singh, A. K. (2026) · SSRN Electronic Journal · doi:10.2139/ssrn.6345092
Métabolisme redox et plasticité tissulaire des tissus adipeux
Jeanson, Y. (2015) · theses.fr (ABES) · doi:10.70675/0a5580f9z0185z4ab1zba28zb59c62a27680
Adipose Tissue–Brain Crosstalk: The Role of Adipokines in the Regulation of Cognitive Function
Żołyniak, M., Soczyńska, J., Kania, K., Szwach, J., Kurowski, M., Gawełczyk, W., & Woźniak, S. (2026) · Obesities · doi:10.3390/obesities6030032
“Similarly, irisin, originally characterised as a myokine, has also been detected in adipose tissue and is increasingly considered an adipomyokine, reflecting its involvement in systemic energy homeostasis and metabolic regulation [63,64].”
Irisin levels in patients with prediabetes mellitus: A case-control study and meta-analysis
Song, L.-W., Huang, W.-W., Chang, L.-N., Wang, X., Sun, Q., Wang, X.-L., & He, Q. (2026) · World Journal of Diabetes · doi:10.4239/wjd.120779
Abdi, A. (2025) · Physiology and Pharmacology · doi:10.66224/phypha.29.4.398
“During aerobic exercise, the secretion of certain hormones that induce the expression of the uncoupling protein gene is elevated, particularly norepinephrine (Kjær 2005), thyroid hormones (Viru and Viru 2001), and the pseudo-hormone Irisin (Roca-Rivada et al., 2013).”
Effect of Bruce and Wingate Protocols on PGC-1α in Well-Trained Endurance Athletes
Akcan, İ. O., Dündar, S. T., & Gönülateş, S. (2026) · The Online Journal of Recreation and Sport · doi:10.22282/tojras.1825561
Gao, R., Zhang, Y., & Quan, L. (2026) · Comprehensive physiology · doi:10.1002/cph4.70248
Metadata
- Authors
- Roca-Rivada, A., Castelao, C., Senin, L. L., Landrove, M. O., Baltar, J., Crujeiras, A. B., Seoane, L. M., Casanueva, F. F., & Pardo, M.
- Affiliations
- Instituto de Salud Carlos III (ES)
- Complejo Hospitalario Universitario de Santiago (ES)
- Corresponding author
- Pardo, María
- Venue
- PLoS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2013-04-11
- Volume
- 8
- Issue
- 4
- Pages
- e60563
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC3623960
- OpenAlex
- W2008675205
- Cited by
- 612
- References
- 42
- Citations by year
- 2026: 12 · 2025: 35 · 2024: 45 · 2023: 46 · 2022: 51 · 2021: 65 · 2020: 45 · 2019: 42 · 2018: 44 · 2017: 52 · 2016: 55 · 2015: 56 · 2014: 44 · 2013: 19
- FWCI
- 40.28
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- PLoS ONE (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, other-oa)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, other-oa)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- RUNA. Repositorio Institucional del Sergas (Servicio Gallego de Salud (SERGAS)) (submittedVersion, cc-by)
- Funders
- Instituto de Salud Carlos III (CB06/03, FISP10/00537)
- Servicio Gallego de Salud
- Topics
- Health Sciences › Medicine › Physiology (medical) › Adipose Tissue and Metabolism
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adipokines, Inflammation, and Metabolic Diseases
- Health Sciences › Medicine › Physiology (medical) › Exercise and Physiological Responses
- Keywords
- FNDC5, irisin, adipokines, myokines, white adipose tissue, visceral adipose tissue, subcutaneous adipose tissue, skeletal muscle, endurance training, fasting, obesity, thermogenesis, secretome
- MeSH terms
- Animals, Fibronectins, Humans, Male, Physical Conditioning, Animal, Immunoblotting, Rats, Sprague-Dawley, Muscle, Skeletal, 3T3-L1 Cells, Mice, Rats, Adipose Tissue, White, Adipokines, Real-Time Polymerase Chain Reaction
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