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Activities of human alveolar macrophages (HAMs), note 1: observations on phagocytosis and bacterial killing in the presence of miocamycin

Activities of human alveolar macrophages (HAMs), note 1: observations on phagocytosis and bacterial killing in the presence of miocamycin
Activities of human alveolar macrophages (HAMs), note 1: observations on phagocytosis and bacterial killing in the presence of miocamycin
We studied the activity of human alveolar macrophages (HAMs) obtained by bronchoalveolar lavage (BAL) from human lungs. In particular, we studied in vitro phagocytosis and bacterial killing in basal conditions and in the presence of miocamycin (MOM), a macrolide antibiotic. At a dose of 600 mg every 12 hours, MOM concentrations in the serum were 2.60 micrograms/ml 1 hour after administration and 0.75 microgram/ml 8 h after. The antibiotic cannot be assayed by the microbiological method in the acellular liquid of alveolar lavage. After penetrating the HAMs, it can be detected at a concentration of about 0.4 mcirograms/1.10(6) HAMs. MOM was able to penetrate HAM cytoplasm without altering their vitality. As a matter of fact, the Trypan blue exclusion dye test was not modified after long incubation in the presence of MOM. The HAMs, resuspended in a RPMI 1640 enriched medium, were able to phagocytize either live Staphylococci or inert Latex beads of 1 micron. MOM stimulated the HAM phagocytosis on both Staphylococci and Latex beads. The increase in Latex phagocytosis, a relatively inert substance on which MOM should not be active, is a confirmation of the antibiotic's directed stimulation of the HAMs. Finally, we have seen that the HAMs, which were noteworthy in killing the phagocytized bacteria, were stimulated by MOM after only 30 minutes of contact with the antibiotic.
0392-906X
89-95
Capelli, A.
71d10484-dc93-4f48-bff0-b7974c8ea8f7
Capelli, O.
d0fd9987-0978-49ec-8ea3-3783adf04647
Azzolini, L.
0687f5bb-0bd8-4de3-a507-05b0c4f50cf5
Richeldi, L.
47177d9c-731a-49a1-9cc6-4ac8f6bbbf26
Prandi, E.
c618feed-bc8f-46ce-bd1f-2f41d340b397
Velluti, G.
c5dfde6a-6454-4add-babb-7e6ffb24ebab
Capelli, A.
71d10484-dc93-4f48-bff0-b7974c8ea8f7
Capelli, O.
d0fd9987-0978-49ec-8ea3-3783adf04647
Azzolini, L.
0687f5bb-0bd8-4de3-a507-05b0c4f50cf5
Richeldi, L.
47177d9c-731a-49a1-9cc6-4ac8f6bbbf26
Prandi, E.
c618feed-bc8f-46ce-bd1f-2f41d340b397
Velluti, G.
c5dfde6a-6454-4add-babb-7e6ffb24ebab

Capelli, A., Capelli, O., Azzolini, L., Richeldi, L., Prandi, E. and Velluti, G. (1988) Activities of human alveolar macrophages (HAMs), note 1: observations on phagocytosis and bacterial killing in the presence of miocamycin. Chemioterapia, 7 (2), 89-95. (PMID:3260827)

Record type: Article

Abstract

We studied the activity of human alveolar macrophages (HAMs) obtained by bronchoalveolar lavage (BAL) from human lungs. In particular, we studied in vitro phagocytosis and bacterial killing in basal conditions and in the presence of miocamycin (MOM), a macrolide antibiotic. At a dose of 600 mg every 12 hours, MOM concentrations in the serum were 2.60 micrograms/ml 1 hour after administration and 0.75 microgram/ml 8 h after. The antibiotic cannot be assayed by the microbiological method in the acellular liquid of alveolar lavage. After penetrating the HAMs, it can be detected at a concentration of about 0.4 mcirograms/1.10(6) HAMs. MOM was able to penetrate HAM cytoplasm without altering their vitality. As a matter of fact, the Trypan blue exclusion dye test was not modified after long incubation in the presence of MOM. The HAMs, resuspended in a RPMI 1640 enriched medium, were able to phagocytize either live Staphylococci or inert Latex beads of 1 micron. MOM stimulated the HAM phagocytosis on both Staphylococci and Latex beads. The increase in Latex phagocytosis, a relatively inert substance on which MOM should not be active, is a confirmation of the antibiotic's directed stimulation of the HAMs. Finally, we have seen that the HAMs, which were noteworthy in killing the phagocytized bacteria, were stimulated by MOM after only 30 minutes of contact with the antibiotic.

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Published date: April 1988
Organisations: Clinical & Experimental Sciences

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Local EPrints ID: 368830
URI: https://eprints.soton.ac.uk/id/eprint/368830
ISSN: 0392-906X
PURE UUID: d6bd309a-15f7-4971-8702-74d8c62852ae

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Date deposited: 23 Sep 2014 11:05
Last modified: 18 Jul 2017 01:42

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Contributors

Author: A. Capelli
Author: O. Capelli
Author: L. Azzolini
Author: L. Richeldi
Author: E. Prandi
Author: G. Velluti

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