Expression of stress proteins in human mononuclear phagocytes

Gregg Joslin, Waseem Hafeez, David H. Perlmutter

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


The heat shock/stress response is characterized by the induction of several highly evolutionarily conserved proteins during thermal stress, chemical stress, or glucose starvation. It has recently been recognized that members of the stress protein family are synthesized constitutively and subserve functions that are critical to protein folding during intracellular transport. In this study we examined the expression of heat shock/stress proteins in human mononuclear phagocytes, cells dependent on intracellular transport for Ag processing, Ag presentation, generation of reactive oxygen intermediates, and secretion of proinflammatory and antiinflammatory polypeptides. The results indicate that there are distinct patterns in expression of individual members of the highly homologous SP70, SP90, and ubiquitin gene families during different stress states. There is a marked increase in expression of the heat-inducible form of SP 70 and SP 90 in human monocytes during heat shock. Expression of GRP 78/BiP and GRP 94 increases predominantly during glucose starvation but also increases during heat shock. Ubiquitin gene expression increases during both heat shock and glucose starvation. There is no change in synthesis of the constitutive form of SP 70 or of the ubiquitin activating enzyme E1 during heat shock or glucose starvation. Synthesis of the constitutive form of SP 70 and novel SP 90-like polypeptides increase during endotoxin-mediated inflammatory activation. One intracellular transport process of the mononuclear phagocyte, secretion of specific proinflammatory and antiinflammatory polypeptides, is affected by glucose starvation and by heat shock.

Original languageEnglish (US)
Pages (from-to)1614-1620
Number of pages7
JournalJournal of Immunology
Issue number5
StatePublished - Sep 1 1991
Externally publishedYes

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


Dive into the research topics of 'Expression of stress proteins in human mononuclear phagocytes'. Together they form a unique fingerprint.

Cite this