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Retinoids induce U937 cells to express macrophage phenotype.
The American Journal of the Medical Sciences
|September 1, 1986
Summary
Retinoids, like all-trans-retinoic acid and 13-cis-retinoic acid, influence osteoclast precursor differentiation. While promoting some differentiation, retinoids partially block vitamin D-induced osteoclast precursor development, suggesting antagonistic vitamin A and D effects.
Area of Science:
- Cell Biology
- Endocrinology
- Biochemistry
Background:
- Osteoclast precursors are crucial for bone remodeling.
- Retinoids (Vitamin A derivatives) and Vitamin D metabolites play roles in cellular differentiation.
- Understanding their interplay is vital for bone health research.
Purpose of the Study:
- To investigate the effects of all-trans-retinoic acid (t-RA) and 13-cis-retinoic acid (c-RA) on osteoclast precursor differentiation.
- To determine the interaction between retinoids and 1,25-dihydroxyvitamin D3 in osteoclastogenesis.
Main Methods:
- Utilized the U937 cell line as a model for osteoclast precursors.
- Induced differentiation using 1,25-dihydroxyvitamin D3 and conditioned medium from stimulated human lymphocytes.
- Assessed the impact of varying concentrations of t-RA and c-RA on cellular growth, adherence, and differentiation markers.
Main Results:
- Both t-RA and c-RA inhibited U937 cell growth rates and increased surface adherence.
- Retinoids partially blocked the differentiation of U937 cells induced by 1,25-dihydroxyvitamin D3 and lymphokines.
- Retinoids alone demonstrated a capacity to promote U937 cell differentiation.
Conclusions:
- Retinoids exhibit dual effects on osteoclast precursor differentiation: promoting it independently but antagonizing vitamin D-mediated differentiation.
- Vitamin A and Vitamin D may have opposing roles in the regulation of osteoclast precursor recruitment.
- These findings highlight a complex interaction between retinoids and vitamin D in bone metabolism.