While Wilms tumor—also known as nephroblastoma– is rare, it is the most prevalent childhood kidney cancer. Researchers at Children’s Hospital Los Angeles have now pinpointed a disruption in early kidney progenitor cell development that can be linked to the formation of Wilms tumor.
In a study published in Advanced Science, researchers at the GOFARR Laboratory in Urology compared kidney progenitor cells from a tumor with precursor cells from a healthy kidney. Normally, these precursor cells mature into kidney cells, but when their early development is dysregulated, they behave like cancer stem cells.
While most children with Wilms tumor are successfully treated, current therapies are aggressive. A minority of these patients have unfavorable prognoses or relapses; for these children, there is no existing therapy. “By achieving a more precise understanding of how Wilms tumors develop, our goal is to find new treatments for all types of Wilms tumor,” says Laura Perin, PhD, Co-Director of the GOFARR laboratory and senior study co-author with Stefano Da Sacco, PhD, another researcher at the GOFARR Laboratory.
“Pediatric Wilms tumor can be considered a developmental cancer,” says Dr. Perin, who is also Associate Professor at the Keck School of Medicine of USC. “The normal adult kidney lacks kidney precursor cells, as they are “exhausted” before birth. But in Wilms tumors, instead of giving rise to a functional kidney, these precursor cells persist and form the tumor mass.”
The researchers characterized these Wilms tumor kidney precursor cells, finding that these cells can reproduce the original tumor. “They are aggressive, they’re drug-resistant, they metastasize like cancer cells, and they are able to create the full tumor that we see in patients,” says Astgik Petrosyan, PhD, researcher at the GOFARR Lab and first author of the study.
The kidney precursor cells that generate Wilms tumors also abnormally expressed ITGβ1 and ITGβ4, proteins that help cells communicate with their microenvironment. “This abnormal attachment to their microenvironment favors the uncontrolled replication of these cells and guides the formation of the tumor mass,” says Dr. Da Sacco.
“Our findings provide a more accurate understanding of the different stages of both normal and abnormal kidney development,” says Dr. Perin. “This can possibly help the diagnosis of Wilms tumor, leading to more effective treatments for these patients.”
Other study co-authors include: Valentina Villania, PhD, of CHLA; Paola Aguiari, PhD, of CHLA and David Geffen School of Medicine at UCLA – VA Healthcare System; Matthew E. Thornton, MS, of the Keck School of Medicine of USC; Yizhou
Wang, PhD, and Alex Rajewski, PhD, of Cedars-Sinai Medical Center; Shengmei Zhou, MD, of CHLA, Paolo Cravedi, MD, PhD of the Icahn School of Medicine at Mount Sinai; Brendan H. Grubbs, MD, of the Keck School of Medicine of USC; Roger E. De Filippo, MD, Sargis Sedrakyan, PhD and Kevin V. Lemley, MD, PhD, of CHLA and the Keck School of Medicine at USC; and Marie Csete, MD, PhD of USC.
About Children’s Hospital Los Angeles
Children’s Hospital Los Angeles is at the forefront of pediatric medicine, offering acclaimed care to children from across the world, the country and the greater Southern California region. Founded in 1901, Children’s Hospital Los Angeles is the largest provider of care for children in Los Angeles County, the No. 1 pediatric hospital in the Pacific region and California, and among the top 10 in the nation on U.S. News & World Report’s Honor Roll of Best Children’s Hospitals. Clinical expertise spans the pediatric care continuum for newborns to young adults, from everyday preventive medicine to the most advanced cases. Inclusive, kid- and family-friendly clinical care is led by physicians who are faculty members of the Keck School of Medicine of USC, and proven discoveries reach patients faster through The Saban Research Institute of Children’s Hospital Los Angeles—among the top 10 children’s hospitals for National Institutes of Health funding. The hospital also is home to the largest pediatric residency training program at a freestanding children’s hospital in the western United States. To learn more, follow us on Facebook, Instagram, LinkedIn, YouTube and Twitter, and visit our blog at CHLA.org/blog.
