Impact of neurotransmitters on microalgae: conceptual and practical implications

Apart from their functions in the nervous system of animals, neurotransmitters operate as regulatory agents and signals in diverse kingdoms of life. Many neurotransmitters at low concentrations exert specific effects on microalgae, predominantly functioning as algal growth stimulators. Neurotransmitters that promote microalgal biomass accumulation and enhance the synthesis of lipids, polysaccharides, and other valuable products are of much potential biotechnological interest in terms of projects aimed at producing “algal” drugs and food additives, as well as biodiesel and other kinds of biofuel. Some microalgal species synthesize their own neurotransmitters and/or facilitate their synthesis by the symbiotic microbiota in the gastro-intestinal tract and, therefore, are expected to promote human physical and mental health. Microalgae can exert neuroprotective effects; nevertheless, many microalgae produce toxins affecting the functioning of the nervous system.