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Deprecated: Implicit conversion from float 300.79999999999995 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Int+J+Pharm 2021 ; 595 (ä): 120241 Nephropedia Template TP
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Visualizing the spatial localization of ciclesonide and its metabolites in rat lungs after inhalation of 1-mum aerosol of ciclesonide by desorption electrospray ionization-time of flight mass spectrometry imaging #MMPMID33484917
Yamamoto E; Taquahashi Y; Kuwagata M; Saito H; Matsushita K; Toyoda T; Sato F; Kitajima S; Ogawa K; Izutsu KI; Saito Y; Hirabayashi Y; Iimura Y; Honma M; Okuda H; Goda Y
Int J Pharm 2021[Feb]; 595 (ä): 120241 PMID33484917show ga
Inhaled ciclesonide (CIC), a corticosteroid used to treat asthma that is also being investigated for the treatment of corona virus disease 2019, hydrolyzes to desisobutyryl-ciclesonide (des-CIC) followed by reversible esterification when exposed to fatty acids in lungs. While previous studies have described the distribution and metabolism of the compounds after inhalation, spatial localization in the lungs remains unclear. We visualized two-dimensional spatial localization of CIC and its metabolites in rat lungs after administration of a single dose of a CIC aerosol (with the mass median aerodynamic diameter of 0.918-1.168 mum) using desorption electrospray ionization-time of flight mass spectrometry imaging (DESI-MSI). In the analysis, CIC, des-CIC, and des-CIC-oleate were imaged in frozen lung sections at high spatial and mass resolutions in negative-ion mode. MSI revealed the coexistence of CIC, des-CIC, and des-CIC-oleate on the airway epithelium, and the distribution of des-CIC and des-CIC-oleate in peripheral lung regions. In addition, a part of CIC independently localized on the airway epithelium. These results suggest that distribution of CIC and its metabolites in lungs is related to both the intended delivery of aerosols to pulmonary alveoli and peripheral regions, and the potential deposition of CIC particles on the airway epithelium.