Inhaled dry salt micro particles in the treatment of bronchopulmonary dysplasia: a five case series report

Background. Despite current medical advances, to this day there is no single medical intervention to effectively prevent or treat bronchopulmonary dysplasia (BPD) in both preterm and term infants. Along with protective ventilation strategies, various drugs are being used or are being researched at this very moment, with the sole purpose of improving the general outcome for these patients. Inhaled dry salt micro particles therapy is now one of them. Materials and methods. This report presents five patients, diagnosed with severe BPD. All of them received, complementary to classical BPD management and respiratory support, continuous inhaled dry salt micro particles, via SaltMed cartridges, for a period of 12 to 30 days. After only 24 hours of administration, we were able to observe a significant improvement in respiratory function and dynamics. It was possible to use a lower fraction of inspired oxygen (FiO2), mean airway pressure (MAP) and peak inspiratory pressure (PIP) in all mechanically ventilated patients. Higher tidal volumes were recorded and we observed improvement in oxygenation indexes. Conclusion. Continuously inhaled dry salt micro particles, administered complementary to classic BPD management, could improve respiratory and overall morbidity and mortality in infants with any form of BPD. Further study of these possible effects is needed, as there is no data published on this matter so far

Regulation of TRPM8 channel activity by Src-mediated tyrosine phosphorylation

The transient receptor potential melastatin type 8 (TRPM8) receptor channel is expressed in primary afferent neurons where it is the main transducer of innocuous cold temperatures and also in a variety of tumors, where it is involved in progression and metastasis. Modulation of this channel by intracellular signaling pathways has therefore important clinical implications. We investigated the modulation of recombinant and natively expressed TRPM8 by the Src kinase, which is known to be involved in cancer pathophysiology and inflammation. Human TRPM8 expressed in HEK293T cells is constitutively tyrosine phosphorylated by Src which is expressed either heterologously or endogenously. Src action on TRPM8 potentiates its activity, as treatment with PP2, a selective Src kinase inhibitor, reduces both TRPM8 tyrosine phosphorylation and cold‐induced channel activation. RNA interference directed against the Src kinase diminished the extent of PP2‐induced functional downregulation of TRPM8, confirming that PP2 acts mainly through Src inhibition. Finally, the effect of PP2 on TRPM8 cold activation was reproduced in cultured rat dorsal root ganglion neurons, and this action was antagonized by the protein tyrosine phosphatase inhibitor pervanadate, confirming that TRPM8 activity is sensitive to the cellular balance between tyrosine kinases and phosphatases. This positive modulation of TRPM8 by Src kinase may be relevant for inflammatory pain and cancer signaling