Nanofocused Scanning X-ray Fluorescence Microscopy Revealing an Effect of Heterozygous Hemoglobin S and C on Biochemical Activities in Plasmodium falciparum-Infected Erythrocytes

Anal Chem. 2020 Apr 21;92(8):5765-5771. doi: 10.1021/acs.analchem.9b05111. Epub 2020 Mar 31.

Abstract

While there is ample evidence suggesting that carriers of heterozygous hemoglobin S and C are protected from life-threatening malaria, little is known about the underlying biochemical mechanisms at the single cell level. Using nanofocused scanning X-ray fluorescence microscopy, we quantify the spatial distribution of individual elements in subcellular compartments, including Fe, S, P, Zn, and Cu, in Plasmodium falciparum-infected (P. falciparum-infected) erythrocytes carrying the wild type or variant hemoglobins. Our data indicate that heterozygous hemoglobin S and C significantly modulate biochemical reactions in parasitized erythrocytes, such as aberrant hemozoin mineralization and a delay in hemoglobin degradation. The label-free scanning X-ray fluorescence imaging has great potential to quantify the spatial distribution of elements in subcellular compartments of P. falciparum-infected erythrocytes and unravel the biochemical mechanisms underpinning disease and protective traits.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cells, Cultured
  • Erythrocytes / metabolism*
  • Erythrocytes / parasitology
  • Hemoglobin C / analysis
  • Hemoglobin C / metabolism*
  • Hemoglobin, Sickle / analysis
  • Hemoglobin, Sickle / metabolism*
  • Humans
  • Microscopy, Fluorescence
  • Nanotechnology*
  • Plasmodium falciparum / metabolism*
  • X-Rays

Substances

  • Hemoglobin, Sickle
  • Hemoglobin C