Localization of intracellular Ca2+ stores in HeLa cells during infection with Chlamydia trachomatis

Meytham Majeed, Karl Heinz Krause, Robert A Clark, Erik Kihlström, Olle Stendahl

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Chlamydia trachomatis elementary bodies (EBs) enter epithelial cells within membrane-bound endosomes that aggregate with each other in a calcium-regulated process, but avoid fusion with lysosomes. Annexin III but not I translocates to chlamydial aggregates and inclusions. In this study, we localize the intracellular Ca2+ stores during the course of infection by analyzing the distribution of three intracellular Ca2+ store proteins: calreticulin, type-1 inositol-1,4,5-trisphosphate receptor (IP3-R), and Sarcoplasmic/Endoplasmic Reticulum Ca2+ ATPase type 2 (SERCA2) in HeLa cells infected with C. trachomatis serovar L2. In uninfected cells, immunofluorescence staining of the proteins showed a fine granular distributed pattern for all three proteins. After infection with C. trachomatis, calreticulin was found at the periphery of chlamydial aggregates and inclusions from 3 to 48 hours post-infection. In infected cells, SERCA2 was intimately associated with chlamydial inclusions after 3 and 24 hours, but not after 48 hours. Moreover, IP3-R was translocated to and colocalized with EB aggregates and chlamydial inclusions and had a distribution very similar to that of SERCA2. After 24 hours incubation with chlamydiae, there was a local accumulation of [Ca2+](i) (105 ± 17 nM) in the proximity of chlamydial inclusions, compared to 50 ± 13 nM in other parts of the cell cytoplasm. In the absence of extracellular Ca2+, this local accumulation of Ca2+ increased to 295 ± 50 nM after adding 50 μM ATP, and to a similar extent after adding 100 nM thapsigargin (Tg). These data indicate that during infection of HeLa cells with chlamydiae, intracellular Ca2+ stores are redistributed, causing local accumulation of Ca2+ in the vicinity of chlamydial inclusions. These changes may trigger the association of certain proteins such as annexins with chlamydia-containing vesicles, and thereby regulation of membrane-membrane interaction during endosome aggregation and inclusion formation.

Original languageEnglish (US)
Pages (from-to)35-44
Number of pages10
JournalJournal of Cell Science
Volume112
Issue number1
StatePublished - 1999

Fingerprint

Chlamydia trachomatis
HeLa Cells
Calcium-Transporting ATPases
Chlamydia
Sarcoplasmic Reticulum
Endoplasmic Reticulum
Calreticulin
Endosomes
Infection
Annexin A3
Proteins
Annexins
Inositol 1,4,5-Trisphosphate Receptors
Thapsigargin
Membranes
Lysosomes
Fluorescent Antibody Technique
Cytoplasm
Adenosine Triphosphate
Epithelial Cells

Keywords

  • Chlamydia
  • Elementary body
  • HeLa cell
  • Intracellular Ca store protein
  • Thapsigargin

ASJC Scopus subject areas

  • Cell Biology

Cite this

Localization of intracellular Ca2+ stores in HeLa cells during infection with Chlamydia trachomatis. / Majeed, Meytham; Krause, Karl Heinz; Clark, Robert A; Kihlström, Erik; Stendahl, Olle.

In: Journal of Cell Science, Vol. 112, No. 1, 1999, p. 35-44.

Research output: Contribution to journalArticle

Majeed, M, Krause, KH, Clark, RA, Kihlström, E & Stendahl, O 1999, 'Localization of intracellular Ca2+ stores in HeLa cells during infection with Chlamydia trachomatis', Journal of Cell Science, vol. 112, no. 1, pp. 35-44.
Majeed, Meytham ; Krause, Karl Heinz ; Clark, Robert A ; Kihlström, Erik ; Stendahl, Olle. / Localization of intracellular Ca2+ stores in HeLa cells during infection with Chlamydia trachomatis. In: Journal of Cell Science. 1999 ; Vol. 112, No. 1. pp. 35-44.
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