By: Talking Nutrition Editors
Watch the recorded webinar and learn more about the excitement and interest around the potential of HMOs for human health.
Prof. Hania Szajewska recently presented an intriguing webinar on Human Milk Oligosaccharides (HMOs) that described what they are and what the research tells us about their role in the infant diet, which was followed by a Q&A with Prof. Szajewska and Dr. Louise Vigsnæs, Head of HMO Biology at DSM.
Prof. Szajewska described why there is such a high level of interest in HMOs. Advances in HMO analytics and biotechnology now make it possible to manufacture HMOs. In addition, there are regulatory approvals for the use of certain HMOs in infant, follow-on, and young child formulas from authorities such as the European Commission and the United States Food and Drug Administration (FDA). She noted that currently, the HMOs 2’FL (2 -Fucosyllactose) and Lacto-N-Neotetraose (LNnT) are approved for use, however other HMOs are being evaluated and will soon receive approval. In addition, during the Q&A it was acknowledged that both parents and clinicians have an increasing awareness of HMOs.
The presentation focused on three main points:
Around 200 different HMOs have been identified, with their unique structures being associated with their functions. As Prof. Szajewska explained, the basic structure of all HMOs begins with various combinations of 5 different monosaccharide building blocks and these structures always contain lactose. Interestingly, Dr. Vigsanaes noted in the Q&A that although HMOs contain lactose, they do not appear to cause issues for individuals with lactose intolerance based on a study in adults with irritable bowel syndrome (IBS).1 HMOs are created via a process of structural elongation and branching of the lactose molecule, followed often by fucosylation or sialyation. These HMOs fall within three main categories based on their structure - fucosylated, sialylated, and non-fucosylated neutral HMOs. Differences in these groups, and even in individual HMOs within the groups, determines how they function in the body and what health outcomes they might affect. Prof. Szajewska stated that while bovine milk does contain some milk oligosaccharides, they are at much lower levels and far less diverse structurally. Thus, we should not assume that HMOs and bovine oligosaccharides have equal functionality.
Just as our fingerprints are unique, each mother produces a unique HMO profile and that profile varies over time. Factors that may influence her HMO profile include genetics, lactation status (early versus later lactation), and potentially, time of delivery (term versus preterm), maternal diet, infant gender, and maternal microbiota. Prof. Szajewska noted research in these areas is sometimes conflicting due to the lack of a standardized methodology for HMO assessment. During the Q&A, Dr. Vigsnæs agreed that while different institutions measure HMOs differently, most consistently find that the type and amount of HMOs vary over the course of lactation.
Prof. Szajewska stated that we are at the beginning of a “fascinating journey” in HMO research.
As a clinician, Prof. Szajewska noted that her interest in HMOs is centered around the growing body of research in infants and children. However, she acknowledged the importance of preclinical work in understanding HMO mechanisms of action and informing potential benefits for HMOs in humans.
HMOs have been well-researched for their function as a prebiotic, promoting the growth of bifidobacteria and other potentially beneficial gut microbes. Other areas of investigation include their potential for antiadhesive/antimicrobial effects, modulation of intestinal epithelial cell surfaces, which serve to restrict pathogen adhesion, and immune cell regulation.2 Observational research on HMOs in breastmilk is motivating further study to better understand how they might impact other areas including gastrointestinal health, the immune system, and brain health and development.3-7 During the Q&A, Dr. Vigsnæs noted that an observational study has found sialic acid8 at higher levels in the brains of infants fed breastmilk compared to formula. Studies in neonatal piglets show that dietary 3´Sialyllactose Sodium Salt (3’SL) and 6´Sialyllactose Sodium Salt (6’SL) contribute to the sialic acid content of the brain, suggesting these HMOs may play a role in cognition and brain development.9
Certain HMOs, including 2’FL and LNnT, are currently included in infant formulas based on research demonstrating that these formulas are both safe and supportive of normal growth.9-11 Prof. Szajewska reviewed potential benefits associated with infant formulas supplemented with these HMOs, such as helping shift the microbiota of formula-fed infants closer to that of breastfed infants, immune benefits, and reduced respiratory illness and antibiotic use (based on parent reports).10-13 She emphasized the need for evidence-based strategies that reduce the over prescription of antibiotics in infants, as antibiotic use in early life has been associated with later allergy and obesity.14-16 She noted that future studies are needed to further explore potential benefits of infant formulas with HMOs, yet existing data are encouraging.
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14 January 2021
4 min read
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