Abstract
Prolonged exposure to aluminium may impact health. Aluminium’s deleterious effects are mostly attributed to its selective accumulation in particular organs and cell types. Occupational exposure to aluminium is allied with a reduced level of serum prolactin, a stress peptide hormone mainly synthesised and secreted by the anterior pituitary lactotrophs. Our aim was to study the effect of aluminium on the viability of rat lactotrophs in primary suspension cultures where multicellular aggregates tend to form, comprising approximately two thirds of the total cell population as confirmed by confocal microscopy. Flow cytometric light scattering of calcein acetoxymethyl ester and ethidium homodimer-1 labelled cells was used to define subpopulations of live and dead cells in heterogeneous suspensions comprised of single cells and multicellular aggregates of distinct size. Concentration-dependent effects of AlCl3 were observed on aggregate size and cell survival. After 24-h exposure to 3 mM AlCl3, viability of single cells declined from 5% to 3%, while in multicellular aggregates, viability declined from 23% to 20%. The proportion of single cells increased from 30% to 42% within the same concentration range, while in large aggregates, the proportion remained approximately constant representing 35% of the cell suspension. In large aggregates, cell viability (75%) remained unaltered after exposure to AlCl3 concentrations up to 300 μM, while in single cells, viability was halved at 30 μM. In conclusion, our finding indicates that prolonged exposure to aluminium may lead to significant loss of pituitary cells.
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Abbreviations
- EthD:
-
Ethidium homodimer-1
- FS:
-
Forward angle light scattering
- LDH:
-
Lactate dehydrogenase
- SS:
-
Side angle light scattering
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Acknowledgements
This work was supported by the Ministry of Higher Education, Sciences and Technology of the Republic of Slovenia [P3 310 381, Z3 7476 1683 and BI-PT/06-07-002], the GRICES of the Portuguese Ministry of Sciences, Technology and High Education [4.1.1 Eslovénia] and the FCT of the Portuguese Ministry of Sciences, Technology and High Education [SFRH/BD/41217/2007 to A.I.C., SFRH/BD27467/2006 to E.R. and SFRH/BPD/14677/2003 to V.S.S].
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Calejo, A.I., Rodriguez, E., Silva, V.S. et al. Life and death in aluminium-exposed cultures of rat lactotrophs studied by flow cytometry. Cell Biol Toxicol 26, 341–353 (2010). https://doi.org/10.1007/s10565-009-9147-5
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DOI: https://doi.org/10.1007/s10565-009-9147-5