The liver extracellular matrix is a dynamic scaffold that not only provides structural support but also influences cell behavior and drug delivery. It resides in the space of Disse (between hepatocytes and sinusoidal endothelial cells) and in the periportal and pericentral regions of liver lobules, and it undergoes significant remodeling in disease states. For gene…
Human liver metabolism of xenobiotics (drugs, toxins) is primarily mediated by a family of enzymes known as cytochrome P450s. These enzymes, each with unique substrate specificities, determine how quickly compounds are cleared or activated. However, commonly used liver-derived cell lines like HepG2 or Huh-7 do not express many CYP enzymes at levels comparable to primary…
Glypican-3 (GPC3) is a heparan sulfate proteoglycan tethered to the cell membrane, and it has emerged as a signature biomarker of hepatocellular carcinoma. In healthy adult liver, GPC3 is essentially absent, but in 70–80% of HCC cases it is abundantly expressed on the tumor cell surface. This stark contrast makes GPC3 an ideal target for…
Once foreign DNA is introduced into a hepatocyte (via lipofection, electroporation, viral vectors, etc.), its ultimate goal is to enter the nucleus where transcription occurs. The path from the cell membrane to the nucleus is fraught with challenges. Endocytic vesicles can trap the DNA and shunt it to lysosomes for degradation; the crowded cytoplasm and…
While the primary goal of transfection is gene delivery, the process inevitably interacts with the immune system. The liver, as a central immunological organ, contains various cell types (hepatocytes, Kupffer cells, liver sinusoidal endothelial cells, and infiltrating immune cells) that can mount inflammatory responses when they detect foreign genetic material. Transfection-induced inflammatory signaling refers to…
Transfection—the introduction of exogenous DNA or RNA into cells—is a cornerstone of liver-directed gene therapy and research. However, beyond the immediate expression of delivered genes, transfection can induce epigenetic changes that regulate how long and how strongly those genes are expressed. In liver cells, epigenetic modulation following transfection encompasses chemical modifications to DNA and histones…
The CRISPR-Cas9 system has revolutionized genome editing, and applying it specifically to the liver holds promise for treating genetic liver diseases and studying gene function. Liver-specific CRISPR-Cas9 transfection involves delivering CRISPR components (Cas9 nuclease and guide RNA) in a manner that confines editing activity largely to hepatocytes. Achieving this specificity via transfection (non-viral delivery) requires…
The therapeutic potential of mRNA (messenger RNA) is now well-established, from vaccines to protein replacement therapies. However, ensuring that delivered mRNA remains stable and translatable in liver cells is a key challenge. mRNA stabilization strategies are employed to prolong the half-life of mRNA and enhance its translation efficiency within hepatocytes. These strategies include chemical modifications…
When developing liver-directed gene therapies or conducting in vitro liver research, scientists often observe that primary human hepatocytes are significantly harder to transfect than immortalized hepatocellular carcinoma (HCC) cell lines (like HepG2, Huh7, or Hep3B). These differences in transfection efficiency stem from multiple biological and physical factors: primary cells are quiescent, have intact plasma membrane…
The liver is a complex organ with not only parenchymal hepatocytes but also a rich population of non-parenchymal cells. Among these, Kupffer cells – the resident macrophages of the liver – play a major role in clearing foreign substances. When gene delivery vectors or transfection reagents are administered for liver transfection, Kupffer cells can rapidly…
