Effects of beryllium on human serum immunoglobulin and lymphocyte subpopulation
Ki-Woong Kim1, Daeseong Kim, Yong Lim Won
1Occupational Safety and Health Research Institute, KOSHA, Incheon, Korea.
Insights
Short-term beryllium exposure in workers did not cause immune dysfunction. However, beryllium exposure was linked to increased total lymphocytes and CD95 levels, suggesting lymphocyte proliferation.
Area of Science:
- Immunology
- Occupational Health
- Environmental Toxicology
Background:
- Beryllium exposure is a concern in occupational settings.
- Understanding the short-term immunological effects of beryllium is crucial for worker safety.
Purpose of the Study:
- To investigate the impact of short-term beryllium exposure on human immune cell populations and serum immunoglobulin levels.
- To determine if beryllium exposure affects T-lymphocytes (CD3+, CD4+, CD8+), NK cells, B cells, and TNFα levels.
Main Methods:
- Studied 43 beryllium-exposed workers and 34 healthy controls.
- Measured beryllium levels using atomic absorption spectrometry (NIOSH method 7300).
- Analyzed lymphocyte subpopulations via flow cytometry.
Main Results:
- No significant differences in T-lymphocytes or immunoglobulins between exposed workers and controls.
- Total lymphocyte count and CD95 (APO1/FAS) levels were higher in beryllium-exposed individuals.
- Logistic regression indicated lymphocytes are affected by beryllium exposure (OR=7.293, p<0.001).
Conclusions:
- Short-term beryllium exposure (<3 months) does not appear to induce immune dysfunction.
- Beryllium exposure is associated with lymphocyte proliferation, indicated by increased total lymphocyte and CD95 levels.
Abstract:
To investigate the effects of short-term exposure of beryllium on the human immune system, the proportion of T-lymphocytes such as CD3+, CD4+, CD8+, CD95, and NK cells, andthe proportion of B cells and TNFα level in peripheral blood and immunoglobulins in the serum of 43 exposed workers and 34 healthy control subjects were studied. External exposure to beryllium was measured by atomic absorption spectrometer as recommended by the NIOSH analytical method 7300. T lymphocyte subpopulation analysis was carried out with flow cytometer. The working duration of exposed workers was less than 3 months and the mean ambient beryllium level was 3.4 μg/m(3), 112.3 μg/m(3), and 2.3 μg/m(3) in molding (furnace), deforming (grinding), and sorting processes, respectively (cited from Kim et al., 2008). However, ambient beryllium level after process change was non-detectable (< 0.1 μg/m(3)). The number of T lymphocytes and the amount of immunoglobulins in the beryllium-exposed workers and control subjects were not significantly different, except for the total number of lymphocytes and CD95 (APO1/FAS). The total number of lymphocytes was higher in the beryllium-exposed individuals than in the healthy control subjects. Multiple logistic regression analysis showed lymphocytes to be affected by beryllium exposure (odd ratio = 7.293; p < 0.001). These results show that short-term exposure to beryllium does not induce immune dysfunction but is probably associated with lymphocytes proliferation.
