The importance of gut motility in the metabolic control of propionic acidemia

Chitra Prasad1, Samuel Nurko, Jacob Borovoy

  • 1Division of Genetics, Children's Hospital, Boston, Massachusetts, USA. Chitra.Prasad@lhsc.on.ca

Insights

Enhancing gut motility in propionic acidemia (PA) patients improved metabolic stability. The study showed that using an intestinal motility agent significantly reduced blood ammonia and improved carnitine levels in PA patients.

Area of Science:

  • Biochemistry
  • Gastroenterology
  • Metabolic Disorders

Background:

  • Propionic acidemia (PA) is a metabolic disorder.
  • Gut motility's role in PA metabolic stability is not well understood.

Purpose of the Study:

  • To investigate the effect of enhanced gut motility on metabolic stability in PA patients.
  • To assess the impact of an intestinal motility agent on key metabolic markers in PA.

Main Methods:

  • Prospective study of 4 PA patients over 7 days.
  • Measurements included blood ammonia, amino acids, urine organic acids, and lactulose breath test.
  • Gastrointestinal transit time assessed using radio-opaque markers with and without a motility agent (Senekot).

Main Results:

  • Intestinal motility agent significantly decreased blood ammonia levels.
  • Urinary propionylglycine excretion was reduced.
  • The ratio of free to total carnitine increased.

Conclusions:

  • Enhancing gut motility can improve metabolic stability in patients with propionic acidemia.
  • Intestinal motility agents may be a beneficial adjunct therapy for PA.

Related Concept Videos

Gastric Motility01:16

Gastric Motility

Gastric motility is the coordinated contraction and relaxation of stomach muscles that convert ingested food into chyme, a semi-liquid substance ready for further digestion in the intestines. The process begins with the vagus nerve inducing the relaxation of the smooth muscles in the fundus and body of the stomach, allowing these regions to expand and accommodate up to approximately 1.5 liters of food and liquid.
Peristaltic Waves and Chyme Formation
Upon food entry, the stomach initiates...
Gastrointestinal Motility Disorders01:20

Gastrointestinal Motility Disorders

Gastrointestinal or GI motility disorders are characterized by irregular gastrointestinal tract movements, disrupting food transit from the mouth to the anus. They are caused by damage or dysfunction in gut muscles or nerves. These disorders can cause symptoms such as severe constipation, diarrhea, abdominal pain, and swallowing difficulties. Disorders can affect any segment of the GI tract and range widely in severity, from common conditions like GERD to life-threatening conditions like...
Functions of the Gut Microbiota01:18

Functions of the Gut Microbiota

The gut microbiota includes trillions of microorganisms that colonize the human gastrointestinal tract, including bacteria, archaea, viruses, and fungi. This complex ecosystem plays a critical role in maintaining intestinal and systemic health. Most of these microbes inhabit the large intestine, establishing a relatively stable and diverse community that contributes to gut homeostasis through various metabolic, immunological, and protective mechanisms.Dominant bacterial phyla, such as...
Stomach pH Regulation01:21

Stomach pH Regulation

The human body carefully regulates the internal pH of different organs to maintain homeostasis. For example, while the blood plasma maintains a neutral pH of 7, the stomach lumen has an acidic pH of 1.5 - 3.5. The low pH of stomach lumen helps kill pathogens in the food and break down complex food molecules.
The acid-secreting gastric mucosal epithelial cells (parietal cells) lining the stomach lumen maintain the low pH in the lumen. Numerous ion transporters and channels on these parietal...
Physiology of the Gastrointestinal System III: Elimination01:26

Physiology of the Gastrointestinal System III: Elimination

The gastrointestinal elimination process involves a complex interplay of neural and hormonal mechanisms that coordinate the final waste removal from the body. This intricate operation encompasses the absorption of water and electrolytes, vital for transforming the remaining indigestible food matter into feces. The large intestine is pivotal in water and electrolyte absorption, forming feces from unabsorbed minerals, undigested food, bacteria, bile pigments, and shed epithelial cells. Essential...
What is Monogastric Digestion?01:50

What is Monogastric Digestion?

The human body contains a monogastric digestive system. In a monogastric digestive system, the stomach only contains one chamber in which it digests food. Several other animal species also have monogastric digestive systems, including pigs, horses, dogs, and birds. This chapter, however, focuses on the human digestive system.