5-Aminolevulinic Acid Improves Immune Response in Dairy Cows In Vivo and In Vitro

Area of Science:

• Animal Science
• Immunology
• Biochemistry

Background:

• 5-Aminolevulinic acid (5-ALA) is a natural amino acid crucial for heme biosynthesis.
• Its potential as a bioactive feed additive for modulating immune responses in livestock requires investigation.

Purpose of the Study:

• To evaluate the immunomodulatory effects of 5-ALA in dairy cows.
• To assess the impact of 5-ALA on immune-related gene expression and oxidative status.

Main Methods:

• A crossover study involving six lactating Holstein cows, fed either a control diet or a diet supplemented with 10 mg 5-ALA/kg dry matter for two weeks.
• In vitro experiments using peripheral blood mononuclear cells (PBMC) stimulated with Escherichia coli lipopolysaccharide (LPS).

Main Results:

• Dietary 5-ALA supplementation significantly decreased tumor necrosis factor-alpha (TNF-α) mRNA expression in PBMC.
• Interleukin-1 beta (IL-1β) mRNA expression showed a tendency to decrease with 5-ALA treatment.
• No significant effects of 5-ALA were observed on other immune genes, oxidative status markers, or in vitro TNF-α expression at higher concentrations.

Conclusions:

• 5-Aminolevulinic acid may optimize inflammatory responses by regulating TNF-α expression in dairy cows.
• 5-ALA shows potential as a bioactive feed additive to enhance dairy cow immunity.