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Retinoic acid inhibition of a head and neck multicellular tumor spheroid model
1Department of Head and Neck Surgery, University of Texas M. D. Anderson Cancer Center, Houston 77030.
Abstract:
The effects of retinoic acid (RA) on multicellular tumor spheroids (MTS) derived from a head and neck squamous carcinoma cell line, MDA 886Ln, were studied. Growth of MTSs was shown to be inhibited by 10(-5) to 10(-7) M RA; dose response studies demonstrated that by 10(-10) M RA, MTS growth was inhibited by less than 20%. MTSs treated with RA for 10 days had a decreased labeling index (15% compared with 23% for controls). Histologic studies at 10 days showed both an alteration in tissue-like architecture and an inhibition of squamous differentiation in RA-treated spheroids. Morphologic inhibition of differentiation was confirmed by immunohistochemical staining for involucrin. Histologic sections were also probed with a series of biotinylated lectins to search for RA-induced changes in glycosylation. Changes in staining occurred with two lectins, soybean agglutinin and peanut agglutinin. This study showed that RA induced perturbations in biological processes such as growth and differentiation in a new model system for squamous carcinomas of the head and neck, MDA 886Ln MTS.
Insights
Retinoic acid (RA) inhibits head and neck cancer growth and differentiation in multicellular tumor spheroids (MTS). This study highlights RA
Area of Science:
- Oncology
- Cell Biology
- Biochemistry
Background:
- Head and neck squamous cell carcinoma (HNSCC) is a significant global health concern.
- Multicellular tumor spheroids (MTS) offer a 3D model for studying tumor biology.
- Retinoic acid (RA) is a vitamin A derivative with known roles in cell differentiation and cancer treatment.
Purpose of the Study:
- To investigate the effects of retinoic acid (RA) on MDA 886Ln multicellular tumor spheroids (MTS) derived from HNSCC.
- To evaluate RA's impact on HNSCC cell growth, differentiation, and glycosylation patterns.
Main Methods:
- MDA 886Ln MTS were treated with varying concentrations of RA (10(-5) to 10(-10) M).
- Cell proliferation was assessed using labeling index.
- Histological and immunohistochemical analyses (involucrin staining) were performed to evaluate differentiation.
- Lectins (soybean agglutinin, peanut agglutinin) were used to detect changes in glycosylation.
Main Results:
- RA significantly inhibited MTS growth at concentrations of 10(-5) to 10(-7) M.
- RA treatment led to decreased labeling index (15% vs. 23% in controls) and altered tissue architecture.
- Squamous differentiation was inhibited, confirmed by reduced involucrin expression.
- Specific changes in glycosylation patterns were observed with soybean agglutinin and peanut agglutinin lectins.
Conclusions:
- Retinoic acid (RA) effectively perturbs growth and differentiation in a novel HNSCC MTS model.
- RA demonstrates potential as a therapeutic agent for head and neck squamous cell carcinoma.
- RA-induced alterations in glycosylation may represent a novel biomarker for treatment response.