Medullary thyroid cancer (MTC) is a C-cell neoplasm. Surgery remains its main treatment. Promising therapies based on tyrosine kinase inhibitors demand careful patient selection. We previously observed that two non-steroidal anti-inflammatory drugs (NSAID), indomethacin, celecoxib, and nitric oxide (NO) prevented tumor growth in a model of human MTC cell line (TT) in nude mice. In the present study, we tested the NO donor: glyceryl trinitrate (GTN), at pharmacological dose, alone and in combination with each of the two NSAIDs on TT cells. We also assessed the anti-proliferative potential of NO-indomethacin, an indomethacin molecule chemically conjugated with a NO moiety (NCX 530, Nicox SA) on TT cells and indomethacin/GTN association in rMTC 6–23 cells. The anti-tumoral action of the combined sc. injections of GTN with oral delivery of indomethacin was also studied on subcutaneous TT tumors in nude mice. Apoptosis mechanisms were assessed by expression of caspase-3, TAp73α, TAp73α inhibition by siRNA or Annexin V externalisation. The two NSAIDs and GTN reduced mitotic activity in TT cells versus control (cell number and PCNA protein expression). The combined treatments amplified the anti-tumor effect of single agents in the two tested cell lines and promoted cell death. Moreover, indomethacin/GTN association stopped the growth of established TT tumors in nude mice. We observed a significant cleavage of full length PARP, a caspase-3 substrate. The cell death appearance was correlated with a two-fold increase in TAp73α expression, with inhibition of apoptosis after TAp73α siRNA addition, demonstrating its crucial role in apoptosis. Association of NO with NSAID exhibited amplified anti-tumoral effects on in vitro and in vivo MTC models by inducing p73-dependent apoptotic cell death.

Gene electrotransfer is an attractive method of non-viral gene delivery. However, the mechanism of DNA penetration across the plasma membrane is widely discussed. To explore this process for even larger structures, like viruses, we applied various combinations of short/long and high/low-amplitude electric pulses to L929 cells, mixed with a human adenovirus vector expressing GFP. We observed a transgene expression increase, both in the number of GFP-converted cells and GFP levels, when we added a low-voltage/millisecond-pulse treatment to the adenovirus/cell mixture. This increase, reflecting enhanced virus penetration, was proportional to the applied electric field amplitude and pulse number, but was not associated with membrane permeabilization, nor to direct cell modifications. We demonstrated that this effect is mainly due to adenovirus particle interactions with aggregated aluminum particles released from energized electrodes. Indeed, after centrifugation of the pulsed viral suspension and later on addition to cells, the activity was found mainly associated with the aluminum aggregates concentrated in the lower fraction and was proportional to generated quantities. Overall, this work focused on the use of electrotransfer to facilitate the adenovirus entry into cell, demonstrating that modifications of the penetrating agent can be more important than modifications of the target cell for transfer efficacy.

Arterial stiffness encompasses the global structural and functional modifications that induce progressively increased vascular rigidity, whether associated with pathological cardiovascular or metabolic alterations or not. This narrative review highlights the comparative effects of physical exercise practices, current drug treatments, and approaches based on the use of medicinal plants on arterial stiffness, due to metabolic and/or blood pressure disorders. This review would provide up-to-date information for further experimental and clinical studies concerning the prevention/therapy of high glucose levels and vascular remodelling. Indeed, it is known that physical activities can reduce high blood glucose and blood pressure, allowing the prevention of arterial stiffness. Concerning conventional drugs, some are used to treat arterial stiffness, but their effectiveness is generally limited to treating components of the disease. Eighteen medicinal plant species, belonging to fourteen different botanical families, have potential activities against arterial stiffness in preclinical and/or clinical studies. Several plant extracts reduced the parameters implicated in vascular stiffness, such as the Pulse Wave Velocity, the Augmentation Index, and the Cardio–Ankle Vascular Index. Some plant extracts reduced arterial stiffness by primarily lowering glycemia and/or blood pressure in animal models, which has also been confirmed in humans. By reducing arterial stiffness, plant extracts or derived bioactive compounds not only improved vascular relaxation by enhancing Nitric Oxide production and/or antioxidant defences, but also inhibited inflammation-induced aortic remodelling and promoted elastin neo-synthesis. Polyphenols have often been identified as the main effective compounds involved in these beneficial effects. However, only a few studies explained the mechanisms associated.