Nerve growth factor is preformed in and activates human peripheral blood eosinophils

Abraham Solomon, Luigi Aloe, Jacob Pe'Er, Joseph Frucht Pery, Stefano Bonini, Sergio Bonini, Francesca Levi-Schaffer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

193 Scopus citations

Abstract

Background: Recent studies have shown that nerve growth factor (NGF) is produced by and can act on several immune-inflammatory cells. Objectives: The objective of this study was to study the effects of NGF on human peripheral blood eosinophils and assess whether these cells produce and store NGF. Methods: Eosinophils were purified by negative immunoselection (magnetic cell sorting systems, purity 98% to 100%) from 13 subjects (9 to 26 years old) with mild blood eosinophilia, mainly of allergic origin. Eosinophils were incubated with NGF (50 to 1000 ng/mL), and supernatants were collected for measurement of eosinophil peroxidase (EPO, 20 minutes, colorimetric enzymatic assay) and IL-6 (12 hours, ELISA). Eosinophil viability was evaluated by Trypan blue test (days 2, 3, and 4). NGF content in freshly isolated eosinophils, after ultrasound disruption, was determined with a 2-site immunoenzymatic assay. The presence of mRNA for NGF was evaluated by reverse transcription PCR. Results: NGF caused EPO release (highly significant at 1000 ng/mL NGF). IL-6 release from eosinophils was not higher than IL-6 spontaneously released into culture medium alone. NGF did not significantly affect the number of viable eosinophils. NGF was found in the eosinophil sonicates (1.5 to 17.8 pg/mL per 106 cells). Similarly, mRNA for NGF was detected by reverse transcription PCR in the freshly isolated eosinophils. Conclusions: NGF activates human peripheral blood eosinophils from subjects with mild eosinophilia to selectively release inflammatory mediators. Eosinophils store and produce NGF. Therefore the capability of NGF to induce a secretory response and its production and storage by circulating human eosinophils suggest a possible role for NGF in conditions associated with eosinophilia, including allergic disease.

Original languageAmerican English
Pages (from-to)454-460
Number of pages7
JournalJournal of Allergy and Clinical Immunology
Volume102
Issue number3
DOIs
StatePublished - 1998

Bibliographical note

Funding Information:
Supported by a grant from The Joint Research Fund of The Hebrew University and Hadassah University Hospital, Jerusalem, Israel.

Keywords

  • Allergic diseases
  • Eosinophil peroxidase
  • IL-6
  • Nerve growth factor

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