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Related Concept Videos

MicroRNAs01:22

MicroRNAs

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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The Tumor Microenvironment02:17

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Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
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Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.
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Bone Remodeling01:40

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Compact Bone01:27

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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
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Updated: Feb 10, 2026

Measuring Bone Remodeling and Recreating the Tumor-Bone Microenvironment Using Calvaria Co-culture and Histomorphometry
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Targeting the Metastatic Bone Microenvironment by MicroRNAs.

Marie-Therese Haider1, Hanna Taipaleenmäki1

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MicroRNAs (miRNAs) are key regulators in breast cancer bone metastasis. Targeting these small non-coding RNAs in the bone microenvironment (BME) offers a promising therapeutic strategy for managing metastatic bone disease.

Keywords:
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Area of Science:

  • Oncology
  • Molecular Biology
  • Bone Biology

Background:

  • Bone metastases are a frequent complication of advanced breast cancer, significantly impacting patient prognosis.
  • The bone microenvironment (BME) is crucial, with cancer cells disrupting normal bone remodeling processes involving osteoblasts and osteoclasts.
  • Complex cellular interactions within the BME are mediated by molecular signals, pathways, and epigenetic factors, including non-coding RNAs.

Purpose of the Study:

  • To review the current understanding of the metastatic bone microenvironment's composition and function.
  • To discuss recent advancements in how microRNAs (miRNAs) modulate pathological interactions in the bone environment during metastasis.
  • To highlight the therapeutic potential of targeting miRNAs in metastatic bone disease.

Main Methods:

  • Literature review summarizing research on breast cancer bone metastasis.
  • Analysis of the role of non-coding RNAs, specifically microRNAs (miRNAs), in bone remodeling and metastasis.
  • Examination of experimental and preclinical data on miRNA-based therapeutic strategies.

Main Results:

  • MicroRNAs (miRNAs) are small non-coding RNAs that regulate protein abundance and are critical for bone remodeling.
  • Aberrant miRNA signaling contributes to the progression of bone metastasis by altering cellular interactions within the BME.
  • miRNAs regulate key drivers of bone metastasis and cellular crosstalk in the metastatic BME.

Conclusions:

  • Targeting the bone microenvironment (BME) via miRNA delivery or antagonism shows potential for limiting metastatic bone disease progression.
  • MicroRNAs (miRNAs) represent emerging therapeutic tools for managing breast cancer with bone metastases.
  • Further research into miRNA modulation of the BME is warranted for developing novel treatments.