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Telocytes: Unraveling Their Roles in Health and Disease

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Biology".

Deadline for manuscript submissions: 20 August 2026 | Viewed by 496

Special Issue Editor

Special Issue Information

Dear Colleagues,

Telocytes are a distinct type of interstitial cell characterised by small cell bodies and extremely long, thin extensions known as telopodes, which form complex intercellular networks. Telocytes were relatively recently identified as a type of interstitial (stromal) cell, first described by my mentor, Prof. Laurentiu Popescu, in 2010. Distributed across multiple organs, including the heart, lungs, gastrointestinal tract, and reproductive system, telocytes play critical roles in tissue homeostasis, regeneration, and intercellular signalling. Molecularly, they express markers such as CD34, PDGFR-α/β, and vimentin, and communicate via extracellular vesicles that transport regulatory microRNAs (miRNAs), messenger RNAs (mRNAs), and proteins. Functionally, telocytes are involved in stem cell niche regulation, angiogenesis, and immune modulation, influencing key processes like tissue repair and ECM organisation. Dysregulation in telocyte number or function has been implicated in various pathologies, including cardiac and pulmonary fibrosis, inflammatory diseases, and interactions between tumours and their stroma. Molecular pathways, including PDGF, TGF-β, VEGF, and the Wnt/β-catenin pathway, modulate their activity. Understanding the molecular implications of telocytes offers new insights into regenerative medicine and targeted therapies.

This Special Issue aims to explore the emerging roles of telocytes in tissue homeostasis, regeneration, intercellular communication, and disease modulation. This collection will highlight recent advances in understanding the molecular identity, signalling pathways, and functional interactions of telocytes across various organ systems. Emphasis will be placed on their involvement in regenerative processes, immune regulation, stem cell niche dynamics, and their potential as therapeutic targets in conditions such as fibrosis, inflammation, and cancer. The multidisciplinary nature of this Special Issue aims to deepen the understanding of telocyte biology and expose future translational applications in regenerative medicine, bioengineering, and clinical therapeutics.

Prof. Dr. Sanda Cretoiu
Guest Editor

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Keywords

  • telocytes
  • telopodes
  • intercellular communication
  • stem cell niche
  • extracellular vesicles
  • regenerative medicine
  • tissue remodelling
  • stromal cells

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Published Papers (1 paper)

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Research

21 pages, 4584 KB  
Article
Interaction Between Telocytes and Mast Cells in Genetically Determined Non-Obstructive Azoospermia with AZFc Deletion: An Ultrastructural Study
by Irina Chekmareva, Andrey Kostin, Nina Kulchenko, Grigory Demyashkin, Oksana Paklina, Alexander Alekhnovich, Artem Volodkin, Atim Emaimo John, Ilya Klabukov, Denis Baranovskii, Viktoria Shishkina, Igor Buchwalow, Markus Tiemann and Dmitrii Atiakshin
Int. J. Mol. Sci. 2026, 27(7), 2923; https://doi.org/10.3390/ijms27072923 - 24 Mar 2026
Viewed by 145
Abstract
In idiopathic azoospermia caused by non-obstructive infertility with AZFc deletion, the testicle usually contains an increased number of mast cells (MCs)—which are responsible for collagen synthesis in the testes—as well as Leydig cell hyperplasia. However, the relationship between MCs and telocytes in this [...] Read more.
In idiopathic azoospermia caused by non-obstructive infertility with AZFc deletion, the testicle usually contains an increased number of mast cells (MCs)—which are responsible for collagen synthesis in the testes—as well as Leydig cell hyperplasia. However, the relationship between MCs and telocytes in this pathology remains unexplored. The aim of this study was to examine ultrastructural changes in the interstitial tissue microenvironment of the convoluted seminiferous tubules in the testis, using clinical specimens from men with genetically determined non-obstructive infertility with AZFc deletion. Histological, immunohistochemical, and electron microscopic (EM) studies were performed on surgical materials from 14 patients with AZFc deletion. The IHC study was performed using a panel of antibodies: tryptase, chymase, carboxypeptidase A3, and αSMA. The EM study was performed on ultrathin sections with a thickness of 100–120 nm. MCs were found to be in a functionally active state and characterized by a variety of secretory activities. For the first time, telocytes and their colocalization with MCs and Leydig cells were visualized. It is possibly the telocytes—interacting with MCs—that synchronize the functional activity of the entire MC population of the testis. The interaction of MCs with telocytes, as well as individual secretory granules associated with loci of tropocollagen and collagen microfibril accumulation, leads to the accumulation of collagen fibrils in the interstitium, as observed in idiopathic infertility with AZFc deletion. Even with a small number of MCs in the interstitium of the convoluted seminiferous tubules in the testis, the telocytes are able to synchronize MCs’ activation and secretory activity, supporting the development of a profibrotic phenotype of the tissue microenvironment. The obtained results advance our understanding of idiopathic infertility with AZFc deletion by delineating the ultrastructural landscape of the testicular interstitium and establishing telocytes as key regulators of cellular crosstalk. Telocytes use complex mechanisms for the spatial integration of MCs and fibroblasts in the profibrotic phenotype formation of the convoluted seminiferous tubule tissue microenvironment. Potentially, telocytes can directly be involved in synchronizing such processes by activating the biogenesis and secretion of collagen monomers by fibroblasts; the MC secretome directly affects the polymerization of collagen monomers and dimers into microfibrils in the extracellular matrix, stimulating excessive collagen fiber formation and the development of fibrotic changes. Full article
(This article belongs to the Special Issue Telocytes: Unraveling Their Roles in Health and Disease)
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