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Title: Phagosomal chloride dynamics in the alveolar macrophage

Journal Article · · iScience
 [1];  [1];  [1];  [2];  [1]
  1. Univ. of Chicago, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Acidification in intracellular organelles is tightly linked to the influx of Cl counteracting proton translocation by the electrogenic V-ATPase. We quantified the dynamics of Cl transfer accompanying cargo incorporation into single phagosomes in alveolar macrophages (AMs). Phagosomal Cl concentration and acidification magnitude were followed in real time with maximal acidification achieved at levels of approximately 200 mM. Live cell confocal microscopy verified that phagosomal Cl influx utilized predominantly the Cl channel CFTR. Relative levels of elemental chlorine (Cl) in hard X-ray fluorescence microprobe (XFM) analysis within single phagosomes validated the increase in Cl content. XFM revealed the complex interplay between elemental K content inside the phagosome and changes in Cl during phagosomal particle uptake. Cl-dependent changes in phagosomal membrane potential were obtained using second harmonic generation (SHG) microscopy. These studies provide a mechanistic insight for screening studies in drug development targeting pulmonary inflammatory disease.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institute of Health (NIH); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1893937
Journal Information:
iScience, Journal Name: iScience Journal Issue: 1 Vol. 25; ISSN 2589-0042
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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