FA16 Immunization Module’s Updates

Adjuvants in vaccine formulations

Adjuvants are ingredients added to vaccines to enhance their response and create a stronger immune response in the patient’s body. Aluminum has been used as an adjuvant since the 1930s in the United States [1]. There are few side effects with aluminum, and it was the only adjuvant used in the U.S. for 70 years. Aluminum activates NALP3 inflammasome, which activates release of cytokine IL-1β. According to Casella & Mitchell, aluminum promotes predominantly a TH2-type antibody responses, which we now know is best suited for responses against extracellular pathogens and parasites [2]. Scientists have been looking for other adjuvants that may promote TH1 responses and better immune responses in general.

Recently, the FDA has approved new adjuvants. In Dr. Tapping’s lecture, one of the slides mentioned aluminum is the only adjuvant approved for use in the United States as opposed to places like Europe. However, according to the CDC website, new adjuvants like monophosphoryl lipid A and MF59 have been approved for use in a few vaccines [1]. Monophosphoryl lipid A has been used since 2009 in Cervarix, the vaccine used against HPV. Flaud is a new flu vaccine that contains MF59. MF59 is an oil-based adjuvant that boosts the immune response to this flu vaccine. Additionally, one licensed vaccine against H5N1 influenza contains AS03, but it is not available to the general public yet. AS03 is also an oil-based adjuvant [3].

Many scientists are excited about the prospects of using monophosphoryl lipid A (MPLA) as an adjuvant in vaccines. MPLA is derived from the lipopolysaccharide fraction of the cell walls of gram-negative bacteria, which boosts immunity via TLR4 [2]. More info about its low toxicity and mechanism as a TLR4 agonist is in [2].

 

[1] http://www.cdc.gov/vaccinesafety/concerns/adjuvants.html

[2] https://www.ncbi.nlm.nih.gov/pubmed/?term=Putting+endotoxin+to+work+for+us%3A+Monophosphoryl+lipid+A+as+a+safe+and+effective+vaccine+adjuvant

[3] http://www.fda.gov/biologicsbloodvaccines/safetyavailability/vaccinesafety/ucm187810.htm

  • Richard Tapping
  • Umangi Patel
  • Mary West
  • Mohammed Hayat
  • Jeremy Huckleby Jeremy
  • Angela Delano