Xenon Difluoride Dry Etching for the Microfabrication of Solid Microneedles as a Potential Strategy in Transdermal Drug Delivery.

Although hypodermic needles are a "gold standard" for transdermal drug delivery (TDD), microneedle (MN)-mediated TDD denotes an unconventional approach in which drug compounds are delivered via micron-size needles. Herein, an isotropic XeF2 dry etching process is explored to fabricate silicon-based solid MNs. A photolithographic process, including mask writing, UV exposure, and dry etching with XeF2 is employed, and the MN fabrication is successfully customized by modifying the CAD designs, photolithographic process, and etching conditions. This study enables fabrication of a very dense MNs (up to 1452 MNs cm-2 ) with height varying between 80 and 300 µm. Geometrical features are also assessed using scanning electron microscopy (SEM) and 3D laser scanning microscope. Roughness of the MNs are improved from 0.71 to 0.35 µm after titanium and chromium coating. Mechanical failure test is conducted using dynamic mechanical analyzer to determine displacement and stress/strain values. The coated MNs are subjected to less displacement (≈15 µm) upon the applied force. COMSOL Multiphysics analysis indicates that MNs are safe to use in real-life applications with no fracture. This technique also enables the production of MNs with distinct shape and dimensions. The optimized process provides a wide range of solid MN types to be utilized for epidermis targeting.

Effect of ozone therapy on neutrophil/lymphocyte, platelet/lymphocyte ratios, and disease activity in ankylosing spondylitis: a self-controlled randomized study.

This retrospective self-controlled randomized study was carried out with the participation of 53 patients diagnosed with ankylosing spondylitis according to the modified New York criteria. The patients who did not receive medical treatment or did not change their medical treatment within the last 6 months were included in the study. There was a statistically significant decrease in the patients' neutrophil/lymphocyte ratio, platelet/lymphocyte ratio, monocyte/lymphocyte ratio, C-reactive protein, Visual Analog Scale, Bath Ankylosing Spondylitis Functional Index, and Bath Ankylosing Spondylitis Disease Activity Index scores measured after ozone therapy. There was a positive correlation between neutrophil/lymphocyte ratio, platelet/lymphocyte ratio, mean platelet volume/lymphocyte ratio, monocyte/lymphocyte ratio and C-reactive protein, Visual Analog Scale, Bath Ankylosing Spondylitis Functional Index, Bath Ankylosing Spondylitis Disease Activity Index before and after ozone therapy. Our study revealed that the changes in the decreasing tendency of the markers measured in complete blood count after ozone therapy were correlated with the disease activity, which can contribute to understand the effect of ozone therapy on biomarkers.

The Yin and Yang of exosome isolation methods: conventional practice, microfluidics, and commercial kits.

Exosomes are a subset of extracellular vesicles released from various cells, and they can be found in different bodily fluids. Exosomes have been utilized as biomarkers to diagnose many diseases and to monitor therapy efficiency as they represent the status and origin of the cell, which they are released from. Considering that they co-exist in bodily fluids with other types of particles, their isolation still remains challenging since conventional methods are time-consuming, user-dependent, and result in low isolation yield. This review summarizes the conventional strategies and microfluidic-based methods for exosome isolation along with their strengths and limitations. In particular, microfluidic devices emerge as a promising approach to tackle the existing limitations of conventional methods, and they provide unique features, such as operating with minute volume of samples and rapid process, in order to isolate exosomes with the high yield and the high purity, which make them unprecedented tools for molecular biology and clinical applications in exosome research. This review further elaborates on the existing microfluidic-based exosome isolation methods and denotes their benefits and drawbacks. Herein, we also introduce various commercially available platforms and kits for exosome isolation along with their working principles.

Acupuncture Effects on Blood Parameters in Patients with Fibromyalgia.

Objectives: Acupuncture reduces pain and symptoms significantly in fibromyalgia (FM). Currently, there are no laboratory markers to monitor treatment effectiveness. This study measured differences in biomarkers and test scores of patients with FM before and after acupuncture. Materials and Methods: This retrospective study involved 102 females previously diagnosed with FM at a rheumatology clinic, who had received various medical treatments. Patients who did not receive treatment for symptom management of FM for the last 3 months were included. C-reactive protein (CRP) and complete blood count (CBC), and Fibromyalgia Impact Questionnaire (FIQ) visual analogue scale (VAS) scores before and after the acupuncture sessions were obtained from the patients' files. Neutrophil/lymphocyte ratio (NLR), platelet/lymphocyte ratio (PLR), mean platelet volume/lymphocyte ratio (MPVLR), monocyte/lymphocyte ratio (MLR) were calculated. It was determined if there were statistically differences in these parameters. A correlation analysis was also performed. Results: There were statistically significant decreases in CRP, NLR, PLR, and MPVLR values as well as VAS and FIQ scores in the patient post acupuncture. NLR was positively correlated with disease impact and CRP after completion of acupuncture. Conclusions: The decreasing tendency of the markers from the CBC after acupuncture were correlated with FM impact. These results show effects of acupuncture on biomarkers. Prospective randomized controlled trials on how acupuncture affects blood parameters in patients with FM are needed.