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Localization and altered expression of AKR1C family members in human ovarian tissues
Qing Ji1, Chisa Aoyama, Peter K Chen
1Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA.
Abstract:
Relative expression of AKR1C family members and 5alphaR1 were determined using gene specific quantitative real-time PCR method. Both ARK1C1 and AKR1C2 were found significantly reduced in ovarian tumor tissues compared to ovarian normal tissues. In contrast, AKR1C3 and 5alphaR1 were kept the same transcriptional levels between ovarian tumor tissues and ovarian normal tissues. Immunohistochemical staining indicates that AKR1C1 shares the same localization with AKR1C3. Loss of ARK1C1 and AKR1C2 in ovarian cancerous tissues may enhance progesterone signaling in ovary itself by decreasing the ability of progesterone metabolism.
Insights
Reduced expression of AKR1C1 and AKR1C2 (aldo-keto reductases) in ovarian tumors may increase progesterone signaling. AKR1C3 and 5alphaR1 levels remained unchanged in cancerous ovarian tissues.
Area of Science:
- Biochemistry
- Oncology
- Molecular Biology
Background:
- Progesterone metabolism plays a crucial role in ovarian function and is implicated in gynecological cancers.
- Aldo-keto reductases (AKR1C) and 5alpha-reductase 1 (5alphaR1) are key enzymes involved in steroid hormone metabolism.
- Dysregulation of these enzymes may contribute to the development or progression of ovarian cancer.
Purpose of the Study:
- To investigate the relative expression levels of AKR1C family members (AKR1C1, AKR1C2, AKR1C3) and 5alphaR1 in ovarian tumor tissues compared to normal ovarian tissues.
- To determine the potential impact of altered enzyme expression on progesterone metabolism in the context of ovarian cancer.
Main Methods:
- Gene-specific quantitative real-time PCR was employed to determine the relative mRNA expression of AKR1C1, AKR1C2, AKR1C3, and 5alphaR1.
- Immunohistochemical staining was performed to assess the protein localization of AKR1C1 and AKR1C3.
Main Results:
- Significant downregulation of AKR1C1 and AKR1C2 expression was observed in ovarian tumor tissues relative to normal ovarian tissues.
- Transcriptional levels of AKR1C3 and 5alphaR1 remained comparable between tumor and normal ovarian tissues.
- Immunohistochemistry confirmed that AKR1C1 and AKR1C3 share similar cellular localization.
Conclusions:
- The reduced expression of AKR1C1 and AKR1C2 in ovarian cancer tissues suggests a potential impairment in progesterone metabolism.
- This decreased metabolic capacity may lead to enhanced progesterone signaling within the ovary, potentially influencing ovarian cancer development or progression.
- AKR1C3 and 5alphaR1 do not appear to be transcriptionally altered in ovarian tumors, indicating a specific role for AKR1C1 and AKR1C2 in the disease context.
