Systemically injected drug delivery systems distribute into various organs and tissues, including liver, spleen and kidneys. Recent reports pointed out a significant accumulation of systemically injected nanoparticles in the skin. Skin constitutes the largest organ in the body with important immune functions, and accumulation of drug delivery systems could have significant implications for skin toxicity in living subjects. Fiber optic-based near-infrared spectroscopy (FONIRS) setup was developed and tested for measuring of NIR (760nm excitation) emission spectra in the skin. Ex vivo spectral measurements of NIR fluorescence through the skin showed linear response down to 34 femtomole of dye DiR. Following systemic injection of IRDye 800 labeled 500kDa dextran, FONIRS detected an immediate and stable accumulation of fluorescence in the skin. Longitudinal monitoring of skin accumulation and elimination of IRDye 800-labeled therapeutic anti-epidermal growth factor antibody (cetuximab) showed significant signal in the skin after the antibody cleared from circulation. Comparison of skin accumulation of DiR labeled, long-circulating PEGylated liposomes with short-circulating non-PEGylated liposomes showed much higher accumulation of PEGylated liposomes that persisted several days after the liposomes cleared from blood. Measurements with FONIRS enabled to estimate skin concentration of liposomes (percent of injected dose per gram). This simple and practical approach can be used to monitor accumulation of drug delivery systems in preclinical and clinical studies.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5617645 | PMC |
| http://dx.doi.org/10.1016/j.jconrel.2017.01.006 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The Intermittent Pneumatic Compression Influences Edema Fluid Movement and Promotes the Compensatory Drainage Pathways in Patients with Breast Cancer Related Lymphedema.
Lymphat Res Biol
January 2025
Department of Plastic and Reconstructive Surgery, Medical Centre of Postgraduate Education, Warsaw, Poland.
Upper limb lymphedema is the most common complication after breast cancer therapy. Suddenly disturbed lymphatic transport in the affected arm causes tissue fluid accumulation in tissue spaces, limb enlargement, and secondary changes in tissue. Early compression therapy is necessary.
View Article and Find Full Text PDFSurgical management of endometrial cancer in patient with musculocontractural Ehlers-Danlos Syndrome harboring pathogenic variants in CHST14 (mcEDS-CHST14): A case report.
Gynecol Oncol Rep
February 2025
Department of Obstetrics and Gynecology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan.
Introduction: Musculocontractural Ehlers-Danlos syndrome (mcEDS) is a rare autosomal recessive connective tissue disorder caused by systemic depletion of dermatan sulfate. Symptoms characteristic of mcEDS include multiple contractures, fragile skin with subcutaneous bleeding, and hypermobile joints, which suggest difficulty in perioperative management. However, safe surgical techniques and perioperative management of this disorder remain unknown because of its rarity.
View Article and Find Full Text PDFα-Synuclein distribution in olfactory mucosa and skin nerves in Parkinson disease associated with an EIF4G1 gene mutation.
J Neuropathol Exp Neurol
January 2025
Department of Clinical Neurosciences, Parkinson and Movement Disorders Unit, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy.
The EIF4G1 gene has been considered an autosomal dominant cause of Parkinson disease (PD), even if its role is still debated. The objective of this study was to describe the phenotype and α-synuclein distribution in peripheral tissues in 2 related PD patients (mother and daughter), who are carriers of the same variant in exon 10 of EIF4G1 (c.1216G>A, p.
View Article and Find Full Text PDFThe effects of autophagy-modifying drugs chloroquine and lithium on the skin melanoma microenvironment.
Tissue Cell
January 2025
Laboratory of Ultrastructural Research, Research Institute of Clinical and Experimental Lymphology - Branch of the Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 6 Arbuzov St., Novosibirsk 630117, Russia.
Background: Skin melanoma is a highly metastatic cancer with an increasing global incidence. Despite advancements in immunotherapy, new treatment strategies based on tumor biology are essential for improving outcomes and developing novel therapies. Autophagy plays a critical role in melanoma cell metabolism and affects the tumor microenvironment (TME).
View Article and Find Full Text PDFA Case of Acquired Reactive Perforating Dermatosis with Complete Resolution of Eruptions on Upper and Lower Limbs During the Treatment of Diabetes Mellitus and Peripheral Artery Disease.
Medicina (Kaunas)
December 2024
Department of Dermatology, International University of Health and Welfare Narita Hospital, Chiba 286-8520, Japan.
Acquired reactive perforating dermatosis (ARPD) is characterized by its onset after the age of 18 years, umbilicated papules or nodules with a central keratotic plug, and the presence of necrotic collagen tissue within an epithelial crater. ARPD is strongly associated with systemic diseases such as diabetes mellitus (DM) and chronic renal failure, which may contribute to ARPD through factors including microcirculatory disturbances and the deposition of metabolic byproducts, including advanced glycation end-products and calcium. Here, we report a case of ARPD that improved following DM treatment and catheter-based interventions for peripheral artery disease (PAD).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!