How Carp Cells Adapt to Saltwater Changes Seen Under a Microscope

Jenn Hoskins
26th February, 2024

How Carp Cells Adapt to Saltwater Changes Seen Under a Microscope

In the gills of common carp stressed by salty water, these four images (A-D) capture specialized "nurse" cells called telocytes using their long arms to surround and communicate with a developing muscle cell.

Image adapted from: Massoud et al. / CC BY (Source)
Cells within tissues aren’t isolated; they communicate and support each other. A relatively recently discovered cell type, called a telocyte, appears to play a crucial role in this communication, particularly in maintaining stem cells and aiding tissue repair. These cells, first identified as having unique structural features[2], are found throughout the body and are thought to act as ‘connecting’ or ‘nurse’ cells. However, how telocytes respond to environmental stress and how this impacts their interaction with other cells isn’t fully understood. A study conducted by researchers at Jouf University[1] investigated this by examining the effects of salt stress on telocytes in fish, specifically looking at their relationship with stem cells and developing muscle cells. The study focused on common carp exposed to different levels of salinity – 0.2, 6, and 10 parts per thousand (ppt). Researchers used transmission electron microscopy (TEM), a powerful technique allowing visualization of cells at a very high magnification, to observe changes in telocyte structure and activity within the gills of the fish. TEM allows scientists to see the internal structures of cells in detail, and was previously used to identify telocytes in other tissues like the esophagus[3]. The researchers found that telocytes visibly changed their shape and increased their secretory activity – essentially, they became more active in releasing substances – when exposed to higher salinity levels. This suggests telocytes are sensitive to environmental changes and respond to stress. Importantly, the TEM images revealed a close physical relationship between telocytes and stem cells. Telocytes were observed surrounding stem cells, and their long, thin extensions, called telopodes, were making direct contact with the stem cell membranes. This supports the idea that telocytes act as ‘nurse’ cells, providing support and signals to stem cells. The study also showed similar interactions between telocytes and myoblasts – immature muscle cells. Telocytes and their telopodes enveloped the myoblasts, and the researchers observed telocytes releasing vesicles (small packages containing molecules) that were taken up by the muscle cells. This suggests telocytes are involved in the development and growth of muscle tissue, a process called fibrillogenesis. Interestingly, the skeletal muscles themselves also became larger (hypertrophied) under salt stress, further indicating a role for telocytes in adaptation. These findings build upon earlier work demonstrating that telocytes form extensive networks within tissues[4], connecting them to various cell types including immune cells, nerve cells, and other stem cells. The current study extends this understanding by showing that telocytes aren’t just structurally connected to these cells, but actively respond to environmental cues and modulate their interactions with them. The observed planar contact between telopodes and stem cells, as seen in the TEM images, is consistent with the idea that telocytes facilitate communication through direct cell-cell interactions. The Jouf University research suggests that the activation of telocytes is a key part of how organisms adapt to stressful conditions. The reciprocal interaction between telocytes and other cells, as highlighted in the study, implies a dynamic relationship where both cell types contribute to maintaining tissue health under stress. This research adds to the growing body of evidence that telocytes are not simply structural components of tissues, but active participants in intercellular communication and tissue homeostasis.

BiotechAnimal ScienceMarine Biology

References

Main Study

1) A transmission electron microscopy investigation suggests that telocytes, skeletal muscles, myoblasts, and stem cells in common carp (Cyprinus carpio) respond to salinity challenges.

Published 24th February, 2024

https://doi.org/10.1186/s12917-024-03916-0

Related Studies

2) The functional morphology and role of cardiac telocytes in myocardium regeneration.

https://doi.org/10.1139/cjpp-2016-0052

3) Esophageal telocytes and hybrid morphologies.

https://doi.org/10.1042/CBI20120007

4) Cardiac telocytes - their junctions and functional implications.

https://doi.org/10.1007/s00441-012-1333-8


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