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Microbiota of the Stomach and Small Intestine01:27

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The human gastrointestinal (GI) tract is characterized by distinct physicochemical conditions that shape its microbial communities. Among these, the stomach presents a particularly challenging environment for microbial colonization due to its highly acidic pH, ranging from 1 to 3. This extreme acidity effectively limits microbial density. However, certain acid-tolerant microorganisms are capable of surviving in this niche. Notably, Helicobacter pylori can colonize the gastric mucosa,...
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The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from...
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The large intestine hosts the most densely populated microbial ecosystem in the human body. This complex community primarily consists of anaerobic bacteria, with Bacillota (formerly Firmicutes) and Bacteroidota (formerly Bacteroidetes) as the predominant groups. The distribution of these microbes varies along different sections of the large intestine, influenced by local environmental factors such as oxygen availability and nutrient composition.The cecum, located at the beginning of the large...
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Microorganisms colonize various regions of the human body, including the mouth, nasal passages, throat, stomach, intestines, urogenital tract, and skin. The total number of microbial cells is estimated to range from 10¹³ to 10¹⁴—comparable to, or exceeding, the number of human somatic cells. This host–microbiome relationship has led to the conceptualization of humans as supraorganisms, wherein microbial communities perform vital roles in development, immunity,...
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Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
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The establishment of the oral microbiome begins before birth, challenging the long-held belief that the fetal oral cavity is sterile. The presence of oral microbes such as Streptococcus and Fusobacterium in amniotic fluid suggests that microbial exposure may occur in utero, potentially through translocation from the maternal oral or gastrointestinal tract. This early colonization primes the neonatal immune system and sets the stage for subsequent microbial succession. Maternal health,...
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Intestinal microbiota and its relationship with necrotizing enterocolitis.

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Necrotizing enterocolitis (NEC) in preterm infants is linked to abnormal gut bacteria. Restoring a healthy gut microbiome with probiotics may prevent NEC by protecting the infant gut from inflammation and injury.

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Area of Science:

  • Neonatal Medicine
  • Microbiology
  • Gastroenterology

Background:

  • Necrotizing enterocolitis (NEC) is a significant cause of illness and death in premature infants.
  • The development of a healthy gut microbiome after birth is crucial for neonatal health.
  • Disrupted or delayed microbial colonization is a key risk factor for NEC development.

Purpose of the Study:

  • To review the relationship between intestinal microbiota and NEC in preterm infants.
  • To explore how microbial colonization impacts NEC pathogenesis.
  • To discuss the potential of microbiome-targeted therapies for NEC prevention.

Main Methods:

  • Literature review of studies on intestinal microbiota and NEC in preterm infants.
  • Analysis of the role of microbial colonization in NEC pathogenesis.
  • Evaluation of current and emerging therapeutic strategies, including probiotics.

Main Results:

  • A healthy gut microbiota may protect the immature gut from inflammation and injury.
  • An imbalance or deficiency in gut bacteria is implicated in NEC development.
  • Probiotic therapy shows promise in restoring a protective microbial balance.

Conclusions:

  • The intestinal microbiota plays a critical role in the pathogenesis and prevention of NEC.
  • Modulating the gut microbiome is a promising therapeutic avenue for NEC in preterm infants.
  • Further research into microbiome interventions is warranted to improve outcomes for premature neonates.