Glucose, Sorbitol and Insulin as Exogenous Agents that Monitor the Interautogamous Interval (IAI) in <i>Paramecium primaurelia</i>

Prajer, M

doi:10.3409/173491605775142873

Cited by 2 publications

(2 citation statements)

References 45 publications

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“…Long‐lasting application of insulin increased methane production in Entodynium caudatum rumen culture (Kisidayova and Váradyova, ). Autogamy induction by insulin was also observed in Paramecium primaurelia (Prajer, ).…”

Section: Insulin and Non‐‘tetrahymena’ Protozoamentioning

confidence: 73%

Insulin at a unicellular eukaryote level

Csaba

2013

Cell Biology International

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The unicellular ciliate, Tetrahymena, has been the main model for studying the hormonal system of unicellular animals. Tetrahymena produce, store, secrete and take up insulin, the hormone being similar to that of mammals, both immunocytochemically and functionally. The plasma membrane and nuclear envelope of Tetrahymena have insulin receptors, which are structurally similar to the mammalian receptor, as it their binding capacity. The cell has also second messengers and signal pathways for insulin. Insulin influences the synthesis of other hormones. The first short encounter between the cell and insulin provokes the hormonal imprinting that alters the function of the cells and is transmitted to the progeny, and can persist for over 1,000 generations, in hormone binding, hormone content, phagocytosis, cell growth and movement. Insulin has a survival function in Tetrahymena and during stress insulin production and binding are elevated. Other protozoa also react to insulin, and the evolutionary aspects are discussed in this review since it is still not appreciated that the hormones are of great antiquity in the animal kingdom.

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Section: Insulin and Non‐‘tetrahymena’ Protozoamentioning

confidence: 73%

Insulin at a unicellular eukaryote level

Csaba

2013

Cell Biology International

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“…Besides the genetic and endogenous epigenetic factors, the induction of meiosis can also be controlled by environmental factors. The effects of such exogenous factors on the length of the interautogamous interval were investigated in Paramecium primaurelia (PRAJER 2005). The cells of this species, characterized by a relatively long autogamous immaturity period in comparison with the other representatives of the P. aurelia complex (KOOECIUSZKO & PRAJER 1988), were separately submitted to the action of glucose, sorbitol and insulin.…”

Section: Exogenous Factors Affecting the Induction Of Meiosismentioning

confidence: 99%

Genetic and Epigenetic Factors Affecting Meiosis Induction in Eukaryotes Revealed in Paramecium Research

Prajer

2008

folia biol (krakow)

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This review presents studies of the induction of meiosis undertaken on the ciliate Paramecium, a unicellular model eukaryotic organism. Meiosis in Paramecium, preceding the process of fertilization, appears in starved cells after passing a defined number of divisions (cell generations), starting from the last fertilization. Investigations were performed on clones of cells entering autogamy, a self-fertilization process. Genetic as well as epigenetic factors, i.e. endo-and exogenous factors, affecting the induction of meiosis and changing the duration of the interautogamous interval (IAI), were analyzed. The results show that: (1) Meiosis induction is controlled genetically by the somatic macronucleus. However, besides the nuclear factors, the cytoplasmic protein immaturin also affects this process (HAGA & HIWATASHI 1981); (2) Epigenetic factors, such as non-genetically disturbed cytoskeleton structures and changes in the cell architecture observed in doublet Paramecium cells, exert internal mechanical stress (INGBER 2003), which constitutes the endogenous impulse accelerating meiosis; (3) Mild osmotic stress, acting as an exogenous factor, can initiate the specific MAP kinases signaling pathway resulting in earlier meiosis induction, as in other unicellular eukaryotes (SEET & PAWSON 2004).

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Glucose, Sorbitol and Insulin as Exogenous Agents that Monitor the Interautogamous Interval (IAI) in Paramecium primaurelia

Cited by 2 publications

References 45 publications

Insulin at a unicellular eukaryote level

Insulin at a unicellular eukaryote level

Genetic and Epigenetic Factors Affecting Meiosis Induction in Eukaryotes Revealed in Paramecium Research

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