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The expression patterns of gremlin 1 and noggin in normal adult and tumor tissues
Riikka Laurila1, Seppo Parkkila, Jorma Isola
1Institute of Biomedical Technology, University of Tampere and BioMediTech, Tampere, Finland.
Abstract:
Gremlin 1 and noggin are inhibitors of bone morphogenetic protein (BMP) signaling. They are vital during early development but their role in adult tissues has remained largely unresolved. The BMP signaling pathway has also been implicated in tumorigenesis, however with emphasis on the role of the ligands and receptors. We performed a concurrent survey of gremlin 1 and noggin protein expression in multiple normal and cancer samples, using immunohistochemistry on tissue microarrays containing 96 samples from 34 different normal organs/tissue sites and 208 samples of 34 different tumor types. In majority of both normal and tumor samples, gremlin 1 and noggin expression was negative or weak. However, normal stomach and skin demonstrated distinct gremlin 1 and noggin expression indicating a role in adult tissues. Likewise, strong expression of both antagonists was detected in Leydig cells of testis. In the tumor panel, the expression patterns were more variable but elevated BMP antagonist expression was detected for the first time in few cases, such as glioblastoma, hepatocellular carcinoma and diffuse B-cell lymphoma for gremlin 1 and renal granular cell tumor and thyroid papillary carcinoma for noggin. Even though gremlin 1 and noggin were not widely expressed in adult tissues, in a subset of organs their expression pattern indicated a potential role in normal tissue homeostasis as well as in malignancies.
Insights
Gremlin 1 and noggin, inhibitors of bone morphogenetic protein (BMP) signaling, show limited expression in adult tissues but are present in normal stomach, skin, and Leydig cells. Their expression patterns suggest roles in tissue homeostasis and certain cancers.
Area of Science:
- Molecular Biology
- Developmental Biology
- Oncology
Background:
- Gremlin 1 and noggin are key inhibitors of bone morphogenetic protein (BMP) signaling.
- While crucial in development, their function in adult tissues is largely unknown.
- BMP signaling is implicated in tumorigenesis, primarily focusing on ligands and receptors.
Purpose of the Study:
- To investigate the expression patterns of gremlin 1 and noggin proteins in various normal adult tissues and cancer types.
- To explore the potential roles of these BMP antagonists in adult tissue homeostasis and cancer development.
Main Methods:
- Utilized immunohistochemistry on tissue microarrays.
- Analyzed 96 samples from 34 normal tissue sites.
- Examined 208 samples from 34 different tumor types.
Main Results:
- Gremlin 1 and noggin expression was generally weak or negative in most normal and tumor samples.
- Distinct expression was observed in normal stomach, skin, and Leydig cells of the testis.
- Elevated gremlin 1 was noted in glioblastoma, hepatocellular carcinoma, and diffuse B-cell lymphoma.
- Elevated noggin was detected in renal granular cell tumors and thyroid papillary carcinomas.
Conclusions:
- Gremlin 1 and noggin have limited but specific expression in certain adult tissues, suggesting roles in homeostasis.
- Expression patterns in specific cancers indicate a potential involvement in tumorigenesis.
- Further research is warranted to elucidate the precise functions of these BMP antagonists in adult tissues and malignancies.
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