Small molecule distribution in rat lung: a comparison of various cryoprotectants as inflation media and their applicability to MSI

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• 作者：Sooraj Baijnath ; Adeola Shobo ; Linda A. Bester…
• 关键词：Lung inflation ; Cryopreservation ; MALDI ; MSI ; Drug distribution ; Gatifloxacin
• 刊名：Journal of Molecular Histology
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：47
• 期：2
• 页码：213-219
• 全文大小：847 KB
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• 作者单位：Sooraj Baijnath (1)
  Adeola Shobo (1)
  Linda A. Bester (2)
  Sanil D. Singh (2)
  Gert Kruger (1)
  Tricia Naicker (1)
  Thavendran Govender (1)
  
  1. Catalysis and Peptide Research Unit, University of KwaZulu-Natal, Westville Campus, E-Block, 6th Floor, Room E1-06-016, Durban, South Africa
  2. Biomedical Resource Unit, University of KwaZulu-Natal, Westville Campus, Durban, South Africa
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Cell Biology
  Biomedicine
  Developmental Biology
  
• 出版者：Springer Netherlands
• ISSN：1567-2387

文摘

Given the recent explosion of mass spectrometric imaging (MSI), it has become easier to assess drug tissue localisation without the use of radiolabeling and other more complex methods (such as PET and MRI). For MSI tissue preparation is of utmost importance, however, the lung in particular does pose some difficulties with imaging since it is made up of a number of air-filled alveoli. These organs are known to collapse when the thoracic cavity is pierced, losing its structural integrity and giving poor histological representation for drug distribution analysis. The use of cryoprotectants as a tissue inflation media will aid in the preservation of the lung’s structural integrity during MSI experiments involving small molecule distribution. Various established cryoprotectants (DMSO, PvP, ethylene glycol, sucrose, DMEM, control serum, OCT) were selected as lung inflation media for MSI analysis of gatifloxacin (GAT). Female Sprague–Dawley rats were treated with GAT (10 mg/kg b.w) via i.p. injection. After 15 min the animals were terminated by halothane overdose, and each set of tissue inflated with a specific agent. Cryosections were made and MSI conducted to determine drug tissue distribution. During the early stages of the experimental procedure some crypreservatives were eliminated due to difficulties with sample preparation. While others displayed excellent preservation of the tissue structure and integrity. Following MSI analysis, some agents showed homogenous drug distribution while some displayed heterogeneous distribution favoring the basal periphery. Taking into account the physiology of the lung and previous MRI investigations of its perfusion, it is expected that a systemically administered drug would localize in the basal areas. DMSO and DMEM proved to display this distribution pattern while keeping structural integrity intact. However, the later was ruled out since it showed complete suppression of GAT in solution. From the cryoprotectants selected for this study, DMSO is the most promising lung inflation media focusing on small molecule distribution via MSI.