Treatment for inflammatory bowel disease doesn't always work; new study uncovers why

October 20, 2020

Inflammatory bowel disease (IBD) affects more than 70,000 children in the United States and the prevalence is rising. In fact, 25% of the 3.1 million individuals with IBD present before 21 years of age. There is no cure for IBD, and treatment often includes medication to block a molecule that causes inflammation in the intestines called tumor necrosis factor (TNF). Unfortunately, the TNF-blocking therapy doesn't work for many children and its therapeutic effects can be short-lived.

In a new study in Cell Reports, investigators at The Saban Research Institute at Children's Hospital Los Angeles have uncovered a role that TNF and its receptor play in intestinal health that will lead to a better understanding of TNF. This could positively impact future treatments for patients with IBD.

Children with IBD, a broad term which includes Crohn's disease and ulcerative colitis, can experience abdominal pain and weight loss, which can impact a child's growth. Patients with these conditions often have elevated levels of TNF in their bloodstream and intestines.

"Increased expression of TNF is one of the body's first responses to infection or injury," says D. Brent Polk, MD, a physician and investigator who studies intestinal development and associated disorders. "In many patients, antibodies that block TNF are effective, but most patients don't benefit from the therapy long term."

Sometimes, says Dr. Polk, patients initially show improvement, but then the treatment stops working. Oddly, some children even develop IBD when they receive anti-TNF therapy for an unrelated condition, such as juvenile arthritis.

Dr. Polk's investigations take a different approach to studying IBD. Instead of viewing TNF signaling as either pro- or anti-IBD, his work examines whether there is a range of TNF levels that maintain intestinal health.

"We know that TNF signaling leads to inflammation," he says, "but when we blocked the TNF receptor in a pre-clinical model of IBD, it led to early-onset colitis. So, it's not a simple matter of blocking TNF outright. The body is really fine tuned to maintain health."

His study shows that the timing of TNF signaling and which receptors are activated developmentally could be more important than merely the levels of the inflammatory molecule.

"It's not that TNF signaling is 'good' or 'bad,'" explains Dr. Polk. "It's more complicated than the field previously understood." He says that TNF does cause inflammation in the intestines, but it also appears to play a protective role, especially early in life.

The study is preclinical but has important implications for patients. Future therapies depend on a better understanding of how molecules like TNF function. Work like Dr. Polk's could lead to treatments that give relief to all children with IBD.
-end-
About Children's Hospital Los Angeles

Founded in 1901, Children's Hospital Los Angeles is the highest-ranked children's hospital in California and fifth in the nation on the prestigious U.S. News & World Report Honor Roll of Best Children's Hospitals. U.S. News ranks Children's Hospital Los Angeles in all 10 specialty categories. Clinical care at the hospital is led by physicians who are faculty members of the Keck School of Medicine of USC through an affiliation dating from 1932. The hospital also operates the largest pediatric residency training program at a freestanding children's hospital in the Western United States. The Saban Research Institute of Children's Hospital Los Angeles is home to all basic, translational, clinical and community research conducted at the hospital, allowing proven discoveries to quickly reach patients. Our mission: to create hope and build healthier futures. To learn more, follow us on Facebook, Instagram, LinkedIn, YouTube and Twitter, and visit our blog at CHLA.org/blog.

Children's Hospital Los Angeles

Related Inflammatory Bowel Disease Articles from Brightsurf:

People with inflammatory bowel disease still die earlier despite increase in life
A study comparing life expectancy of people with inflammatory bowel disease (IBD) and without found that, while life expectancy increased for both groups, people with IBD generally died sooner.

Cell therapy designed to treat inflammatory bowel disease
The UPV/EHU's NanoBioCel research group has for many years been developing systems enabling cells to be used as drugs.

Team develops wearable sensor to help people with inflammatory bowel disease
University of Texas at Dallas researchers have designed a wearable device that monitors sweat for biomarkers that could signal flare-ups of inflammatory bowel disease (IBD).

Antibiotics associated with increased risk of inflammatory bowel disease
Antibiotics use, particularly antibiotics with greater spectrum of microbial coverage, may be associated with an increased risk of new-onset inflammatory bowel disease (IBD) and its subtypes ulcerative colitis and Crohn's disease.

Yes, inflammatory bowel disease and celiac disease are linked
A systematic review and meta-analysis that has determined there is a nine-fold increased risk of having IBD for patients with a previous diagnosis of celiac disease.

The effects of inflammatory bowel disease on pregnancy
Inflammatory bowel disease (IBD) -- including Crohn's disease and ulcerative colitis -- often affects women of childbearing age.

5 major advances in inflammatory bowel disease (IBD) treatment
Summary of five impactful studies to be presented at the Crohn's & Colitis Congress, a partnership of the Crohn's & Colitis Foundation and the American Gastroenterological Association (AGA).

Researchers identify a possible cause and treatment for inflammatory bowel disease
In a study published online in PNAS on Jan. 20, 2020, Prof.

Does inflammatory bowel disease carry certain risks during pregnancy?
Pregnant women with inflammatory bowel disease (IBD) are more likely to undergo delivery by Caesarean section and face certain risks during pregnancy, according to an analysis published in Alimentary Pharmacology & Therapeutics.

Inhibiting a protease could improve the treatment of inflammatory bowel disease
Scientists at the CNIC and CSIC have identified a function of a protease that could be the future target of drugs to treat inflammatory bowel disease.

Read More: Inflammatory Bowel Disease News and Inflammatory Bowel Disease Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.