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Related Concept Videos

Signal Transduction: Overview01:26

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Cells respond to many types of information, often through receptor proteins positioned on the membrane. They respond to chemical signals, such as hormones, neurotransmitters, and other signaling molecules, initiating a series of molecular reactions to produce an appropriate response. This is called signal transduction. Cells also coordinate different responses elicited by the same signaling molecule via mediators, allowing molecular cross-talk.
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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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Transduction01:16

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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate to respond to the environment.
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Related Experiment Video

Updated: Feb 13, 2026

Mimicking the Function of Signaling Proteins: Toward Artificial Signal Transduction Therapy
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Gαi1/3 Is a Novel Regulatory Target for RANKL Signal Transduction and Osteoporosis.

Chaowen Bai1, Mingchao Zhang1, Le Liu2

  • 1Department of Orthopedics, The Second Affiliated Hospital of Soochow University, Suzhou, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|February 12, 2026
PubMed
Summary

G protein alpha subunit i1/i3 (Gαi1/3) is crucial for osteoclast formation, driving bone loss in osteoporosis. Inhibiting Gαi1/3 protects against bone loss, offering a potential new osteoporosis treatment.

Keywords:
Gαi1/3RANKLosteoporosissignal transduction

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Area of Science:

  • Immunology
  • Bone Biology
  • Cell Signaling

Background:

  • Osteoporosis is a growing concern due to aging populations and limited current treatments.
  • The immune system, particularly osteoclasts, plays a significant role in bone resorption.
  • G protein alpha subunits (Gαi) are involved in immune signaling and osteoclastogenesis, but their specific role is unclear.

Purpose of the Study:

  • To investigate the role of Gαi1/3 in osteoclastogenesis and osteoporosis.
  • To determine if Gαi1/3 is a viable therapeutic target for osteoporosis.

Main Methods:

  • Examined Gαi1/3 expression in osteoclast precursors and mature osteoclasts from osteoporotic patients and ovariectomized (OVX) mice.
  • Utilized conditional knockout models to assess the effect of Gαi1/3 deficiency on bone loss in OVX mice.
  • Investigated the impact of Gαi1/3 manipulation on osteoclast formation and function in vitro.
  • Identified critical residues for Gαi3 interaction with RANK-TRAF6 in RANKL signaling.
  • Compared the effects of Gαi1/3 inhibition with denosumab treatment in mice.

Main Results:

  • Gαi1/3 expression was elevated in osteoporotic bone marrow and osteoclasts.
  • Conditional knockout of Gαi1/3 in osteoclast precursors prevented OVX-induced bone loss and improved bone structure.
  • Gαi1/3 deficiency impaired osteoclast formation and bone resorption.
  • Overexpression of Gαi1/3 enhanced osteoclast differentiation and function.
  • The Asp173 residue of Gαi3 is essential for RANK-TRAF6 binding.
  • Inhibition of Gαi1/3 demonstrated protective effects similar to denosumab in vivo.

Conclusions:

  • Gαi1/3 is a critical regulator of osteoclastogenesis and bone resorption.
  • Gαi1/3 plays a key role in the pathogenesis of osteoporosis.
  • Gαi1/3 represents a promising therapeutic target for osteoporosis treatment.