Utilizing Q-bodies for imaging intracellular proteins in live cells - Upsmag - Magazine News

Utilizing Q-bodies for imaging intracellular proteins in live cells

Current advances in imaging innovation have actually made it possible to envision intracellular characteristics, which uses a much better understanding of numerous essential biological concepts for speeding up healing advancement. Fluorescent labeling is one such strategy that is utilized to determine intracellular proteins, their characteristics, and dysfunction. Both internal along with external probes with fluorescent dyes are utilized for this function, although external probes can much better envision intracellular proteins as compared to the internal probes. Nevertheless, their application is restricted by non-specific binding to intracellular elements, leading to a low target particular signaling and greater background sound.

Just recently, a fluorescent dye-labeled immunosensor called Quenchbody (Q-body) has actually been effectively utilized to spot antigens in options or on the cell surface area. A Q-body is basically an antibody piece with the capability to bind a particular antigen.

Versus this background, scientists from Japan and Singapore led by Prof. Hiroshi Ueda from Tokyo Institute of Innovation (Tokyo Tech), Japan just recently reported the applicability of Q-bodies for imaging of intracellular proteins in live cells. Their findings are now released in Chemical Science


Because the Q-body works as a site-specific and antigen-dependent imaging tool, we assumed that it will show antigen-dependent switchable fluorescence on connecting with the target protein, making it possible for exact visualization of intracellular characteristics. We showed this by manufacturing a Q-body for p53, a growth suppressor biomarker protein that plays an essential function in DNA repair work, cellular division, and cell death.”


prof. Hiroshi Ueda, Tokyo Institute of Innovation


The group manufactured a “double” fluorescence dye-labeled Q-body called “C11_Fab Q-body,” which showed much better level of sensitivity and target uniqueness compared to standard probes in human cancer cells revealing p53. Because the expression of p53 boosts in cancer cells, they electroporated the Q-body in numerous human cancer cell lines to confirm their hypothesis.

Compared to a standard probe that showed constant fluorescence signals even in the lack of p53, the Q-body probe showed fluorescence signals in “repaired” cells (cells with denatured proteins to stop decay) revealing p53. Furthermore, the Q-body probe might envision both wild (control) and mutant type p53 in repaired cell samples.

Even more, the group observed fluorescence signals with 8-fold greater strength in live human colon cancer cell lines with p53 expression as compared to the negatives. Remarkably, the Q-body was steady in the long term, showing fluorescence strength modifications with experimentally caused modifications in p53 levels.

Circulation cytometry exposed greater immunofluorescence with Q-body in cells revealing p53. Moreover, on sorting, the ratio and fluorescence signal of these cells was considerably greater (see Fig. 1) compared to the others (with or without Q body).

What are the ramifications of these findings? prof. Ueda responses, “The existing strategies are not able to offer exact imaging of less plentiful intracellular targets with high uniqueness and level of sensitivity. In this context, our research study shows the capacity of Q-bodies in live cell imaging for much better visualization of dynamical intracellular modifications, and offers a method for intracellular antigen-specific sorting of live cells utilizing a Q-body.”

Going on, we can anticipate the advancement of a lot more Q-bodies for imagining numerous other intracellular biomarkers, opening doors to enhanced cell-based healing advancement and cancer research study.


Journal referral:

Dai, Y., et al. (2022) Intra Q-body: an antibody-based fluorogenic probe for intracellular proteins that enables live cell imaging and sorting. Chemical Science. doi.org/10.1039/d2sc02355e

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