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Title: Enhanced alveolar monocytic phagocyte (macrophage) proliferation in tobacco and marijuana smokers

We tested the hypothesis that enhanced cell division accounted for the augmented numbers of monocytic phagocytes with characteristics attributed to alveolar macrophages (AM) found in the lungs of habitual tobacco (T) and marijuana (M) smokers. The monocytic phagocytes, that is, alveolar macrophages, were obtained by bronchoalveolar lavage (BAL) from 12 nonsmoking subjects; 10 subjects who smoked T only (TS); 13 subjects who smoked M only (MS); and 6 smokers of both T and M (MTS). The replication of these cells was determined by measuring the incorporation of ({sup 3}H)thymidine into the DNA of dividing cells and visually counting 2,000 cells on autoradiographically prepared cytocentrifuge cell preparations. This study demonstrated that the number of ({sup 3}H)thymidine-labeled monocytic phagocytes with characteristics of alveolar macrophages from either TS or MS have a higher proliferative index compared to cells (macrophages) from nonsmokers, p less than 0.05 by one-way ANOVA. The total number of BAL macrophages that are in mitosis in TS (17.90 +/- 4.50 labeled AM x 10(3)/ml) or MTS (10.50 +/- 4.20 labeled AM x 10(3)/ml) are 18- and 10-fold greater, respectively, than the number obtained from nonsmokers (1.01 +/- 0.18 labeled AM x 10(3)/ml). Interestingly, the number of ({sup 3}H)thymidine-labeled macrophages frommore » MS (2.90 +/- 0.66 labeled AM x 10(3)/ml) are also greater than the number obtained from nonsmokers, although this is not statistically significant. The stimulus augmenting alveolar macrophage replication is as yet unknown but may likely be found in the T or M smoke.« less
Authors:
; ; ;  [1]
  1. (Univ. of California-Los Angeles School of Medicine (USA))
Publication Date:
OSTI Identifier:
5734299
Resource Type:
Journal Article
Resource Relation:
Journal Name: American Review of Respiratory Disease (New York); (USA); Journal Volume: 143:5 Pt 1
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; MACROPHAGES; CELL PROLIFERATION; MARIHUANA; BIOLOGICAL EFFECTS; TOBACCO SMOKES; AUTORADIOGRAPHY; DNA; LAVAGE; MITOSIS; PHAGOCYTOSIS; THYMIDINE; TRACER TECHNIQUES; TRITIUM COMPOUNDS; AEROSOLS; ANIMAL CELLS; AZINES; CELL DIVISION; COLLOIDS; CONNECTIVE TISSUE CELLS; DISPERSIONS; HERBS; HETEROCYCLIC COMPOUNDS; HYDROGEN COMPOUNDS; ISOTOPE APPLICATIONS; MAGNOLIOPHYTA; MAGNOLIOPSIDA; NUCLEIC ACIDS; NUCLEOSIDES; NUCLEOTIDES; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; PHAGOCYTES; PLANTS; PYRIMIDINES; RESIDUES; RIBOSIDES; SMOKES; SOLS; SOMATIC CELLS 550901* -- Pathology-- Tracer Techniques