Maria-Paula Comanescu

Although the thymus and parathyroid glands originate from the third pharyngeal pouch, their postnatal relationship has been predominantly interpreted in embryological terms, with limited structural evidence supporting a functional interaction. The aim of this study was to explore whether multimodal observations support a previously underrecognized structural relationship between the thymus and parathyroid glands. For this purpose, microCT-based three-dimensional reconstruction was used to assess their spatial and branching high-attenuation structures, and the findings were correlated with histomorphometric analysis, immunohistochemical evaluation of vascular and extracellular matrix markers, scanning electron microscopy (SEM), and available clinical data. MicroCT analysis revealed distinct three-dimensional architectural patterns in thymic and parathyroid tissues. Histomorphometric and immunohistochemical findings revealed stromal organization and molecular expression patterns compatible with tissue remodeling. SEM provided additional microarchitectural detail, supporting the presence of structural continuity. Notably, the integration of three-dimensional imaging with histological and ultrastructural data revealed a previously underrecognized level of organization at the parathyroid–thymus interface. The overall findings indicate a more complex organized anatomical and microvascular relationship rather than a simple juxtaposition of two distinct structures. Taken together, these multimodal findings support the hypothesis of a previously underexplored structural relationship between the thymus and parathyroid glands. However, the proposed microarchitectural framework should be considered exploratory and requires validation using dedicated vascular imaging and morphometric techniques. The observed micro-tissue-specific architecture suggests that an organized structure may facilitate inter-structural communication, potentially resembling a port system-like arrangement. Further studies are required to clarify its physiological relevance.

The thymus and parathyroid glands share a common embryological origin from the third pharyngeal pouch, yet their potential morphological and functional interconnections remain insufficiently explored. We conducted a comparative study integrating immunohistochemistry (IHC) and SEM on human thymic tissue, parathyroid adenomas, and parathyroid tissue excised during thyroidectomy. IHC staining targeted Thymosin-α1, CaSR, and PTH1R, with semi-quantitative evaluation of staining intensity and distribution. SEM analysis was performed at multiple magnifications to assess stromal organization and microvascular relief. Non-parametric statistical tests (Kruskal–Wallis with Mann–Whitney post hoc comparisons) were applied to clinical and laboratory data across the three cohorts. Scanning electron microscopy (SEM) revealed convergent ultrastructural features between thymus and parathyroid, including reticular stromal meshes and vascular grooves suggestive of comparable microcirculatory organization. IHC demonstrated robust Thymosin expression in thymus, with heterogeneous/apical distribution in parathyroid tissue; CaSR showed strong membranous and cytoplasmic expression in parathyroid, but weak diffuse signal in thymus; PTH1R exhibited low-to-moderate expression in thymus and moderate heterogeneous expression in parathyroid, with apical accentuation in adenomas. Statistical analysis confirmed significant differences in ionized calcium, PTH, and anti-AChR titers among the three cohorts (all p < 0.001), while TSH and calcitonin did not differ significantly. Our findings strengthen the hypothesis of a morpho-functional parathyroid–thymus axis. The robust parathyroid expression of CaSR and PTH1R aligns with established roles in calcium–PTH homeostasis, while the novel detection of Thymosin in parathyroid tissue suggests an expanded functional repertoire. These results highlight a continuum between embryological proximity and adult tissue cross-talk, with potential clinical implications for parathyroid pathology and immune regulation.

The parathyroid and thymus glands are key components of the endocrine and immune systems, respectively, with intriguing developmental, anatomical, and functional interrelationships. This study starts from the hypothesis that, given their shared embryological origin, it is plausible that the thymus and parathyroid glands interact functionally and may share pathological pathways. The present study explores the developmental pathways, spatial proximity, and potential cross-talk between these glands. Recent studies suggest that parathyroid hormone (PTH) may influence thymic function, including T-cell maturation and immune regulation, while thymic signaling molecules could impact calcium homeostasis and parathyroid activity. Understanding the functional and etiopathogenical relations between these endocrine glands offers new insights into endocrine–immunological crosstalk, and therapeutic approaches targeting disorders such as hypoparathyroidism, thymomas, myasthenia gravis and thymic hypoplasia. Perspectives and conclusion: Future research is essential to discover the molecular mechanisms underpinning this dynamic interrelation and its broader implications for health and disease. Because there is still very little data on this interaction, in-depth studies are necessary on large groups of patients. This research proposes a cross-study of the receptors for the main substances secreted by the two categories of endocrine glands. At the same time, it is essential to carry out an in-depth study on the cervico-pericardial ligaments through the lens of this glandular interaction. These ligaments could contain the main blood and nerve communication pathway between the parathyroids and the glands.

Neuroinflammation is an inflammatory process that occurs in the central nervous system (CNS), including the brain and spinal cord. It can be triggered by various conditions such as traumatic injuries, infections, neurodegenerative diseases (e.g., Alzheimer's or Parkinson's), autoimmune disorders, or metabolic stress. In cases of acute traumatic brain injury, neuroinflammation is caused by the primary injury and can exacerbate the evolving tissue pathology. The cells involved in the primary brain injury initiate a series of pathological reactions that involve a response from the immune system. It is this immune response that initiates neuroinflammation and leads to pathological consequences over time. The immune response varies depending on the injury mechanism, the location of immune cells in the brain, as well as the affected individual. Understanding the signals that initiate neuroinflammation and the context in which they arise can be crucial for understanding the contributions of immune cells in both pathology and regeneration. This article aims to review a number of factors that could influence the behavior of immune cells following acute traumatic brain injuries and the role of Interleukin-6 in neuroinflammation.