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Intermitochondrial junctions in a subpopulation of peripheral blood lymphocytes from healthy subjects
S Richard1, J M Masse, J Guichard
1Laboratoire de Neurohistologie EPHE, Hôpital de la Salpêtrière, Paris, France.
Insights
Researchers observed intermitochondrial junctions (IMJ) in human lymphocytes. These structures, found in about 10% of cells, are associated with T-cells and their significance is discussed.
Area of Science:
- Cell Biology
- Immunology
Background:
- Intermitochondrial junctions (IMJ) have been observed in various tissues.
- Their presence and function in blood cells, particularly lymphocytes, remain largely undescribed.
Purpose of the Study:
- To report the novel observation of intermitochondrial junctions (IMJ) in human peripheral blood lymphocytes.
- To characterize the prevalence and phenotype of lymphocytes containing IMJ.
Main Methods:
- Observation of IMJ using electron microscopy in peripheral blood lymphocytes from healthy subjects.
- Immunogold staining to determine the T-cell phenotype of lymphocytes with IMJ.
- Analysis of IMJ presence in relation to fixation delay.
Main Results:
- Intermitochondrial junctions (IMJ) were observed in peripheral blood lymphocytes with a periodicity of 15.4 +/- 0.65 nm.
- Approximately 10% of examined lymphocytes contained IMJ, a percentage consistent regardless of fixation delay.
- Lymphocytes exhibiting IMJ were identified as having a T-phenotype.
Conclusions:
- This study provides the first description of intermitochondrial junctions (IMJ) in human blood cells.
- The consistent presence and T-cell association suggest a potential role for IMJ in lymphocyte function.
- Further investigation is warranted to elucidate the functional significance of IMJ in lymphocytes.
Abstract:
This paper reports the observation of intermitochondrial junctions (IMJ) with a periodicity of 15.4 +/- 0.65 nm in peripheral blood lymphocytes of healthy subjects. The percentage of IMJ-containing cells appears constant (about 10% of examined lymphocytes) and is independent of the delay of fixation. Immunogold staining reveals that lymphocytes with IMJ exhibit a T-phenotype. IMJ have been reported in other types of tissues but, to our knowledge, have not been previously described in the blood cell. The signification of these structures is discussed.