Impact of neurotransmitters on the fatty acid composition and photosynthetic pigments of the green microalga Scenedesmus quadricauda

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Abstract

Apart from their functions in the nervous system of animals, neurotransmitters operate as regulatory agents and signals in diverse kingdoms of life. Some neurotrnsmitters at low concentrations have recently been revealed to exert specific effects on microalgae, predominantly functioning as algal growth stimulators. This article presents new data on the effects of such neurotransmitterss as serotonin, norepinephrine, dopamine, histamine, and acetylcholine on the fatty acid and pigment composition of the green microalga Scenedesmus quadricauda (Turp.) Breb. K-1149. It was established that acetylcholine and, to a lesser extent, histamine increased the total fatty acid content of S. quadricauda cells, whereas serotonin and dopamine decreased the fatty acid content. Acetylcholine, histamine, and norepinephrine elevated the percentage of polyunsaturated fatty acids; in contrast, serotonin and dopamine augmented the share of saturated fatty acids. Acetylcholine and, to a lesser extent, norepinephrine increased the total chlorophyll content per 1 g of dry weight in S. quadricauda while histamine decreased the chlorophyll content. Histamine also increased the chlorophyll a/chlorophyll b and carotenoid/chlorophyll ratios, which were decreased by dopamine. The data obtained apparently are of biotechnological and ecological interest. The stimulation of fatty acid accumulation and the increase in polyunsaturated species percentage was caused by the neurotransmitters acetylcholine and histamine at low (1-10 µM) concentrations, which potentially enables facilitating the biotechnological production of health-promoting preparations for therapeutic and cosmetic purposes. However, other tested neurotransmitters (dopamine and serotonin) increased the relative content of saturated fatty acids; therefore, they apparently can be used to stimulate biofuel production, since saturated fatty acid-rich lipids are advantageous raw materials for biodiesel production. The impact of neurotransmitters on microalgal fatty acid composition and photosystem components may be considered in terms of ongoing chemical interaction between microalgae and other aquatic ecosystem components that are known to produce neurotransmitters.

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Cao Boyang

Shenzhen MSU-BIT University

Email: oleskiny@yandex.ru
China, 1 International University Park Road, Dayun New Town China, Longgang District, Shenzhen, 518172, Guangdong Province

O. B. Chivkunova

Moscow State University

Email: oleskiny@yandex.ru

Department of Biology

Russian Federation, Moscow, 119234

A. E. Solovchenko

Moscow State University

Email: oleskiny@yandex.ru

Department of Biology

Russian Federation, Moscow, 119234

E. S. Lobakova

Moscow State University

Email: oleskiny@yandex.ru

Department of Biology

Russian Federation, Moscow, 119234

A. V. Oleskin

Moscow State University

Author for correspondence.
Email: oleskiny@yandex.ru

Department of Biology

Russian Federation, Moscow, 119234

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2. Fig. 1. Growth dynamics of S. quadricauda culture in the presence of acetylcholine (ACh) and without it. 1 – control; 2 – 1 μM ACh; 3 – 10 μM ACh; 4 – 100 μM ACh.

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