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  • 1. Alvarez, Francisco J.
    et al.
    Ryman, Kicki
    Hooijmaijers, Cornelis
    KTH, Skolan för bioteknologi (BIO), Glykovetenskap.
    Bulone, Vincent
    KTH, Skolan för bioteknologi (BIO), Glykovetenskap.
    Ljungdahl, Per O.
    Diverse Nitrogen Sources in Seminal Fluid Act in Synergy To Induce Filamentous Growth of Candida albicans2015Inngår i: Applied and Environmental Microbiology, ISSN 0099-2240, E-ISSN 1098-5336, Vol. 81, nr 8, s. 2770-2780Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The pathogenic fungus Candida albicans is the leading cause of vulvovaginal candidiasis (VVC). VVC represents a major quality- of-life issue for women during their reproductive years, a stage of life where the vaginal epithelium is subject to periodic hormonally induced changes associated with menstruation and concomitant exposure to serum as well as potential intermittent contact with seminal fluid. Seminal fluid potently triggers Candida albicans to switch from yeastlike to filamentous modes of growth, a developmental response tightly linked to virulence. Conversely, vaginal fluid inhibits filamentation. Here, we used artificial formulations of seminal and vaginal fluids that faithfully mimic genuine fluids to assess the contribution of individual components within these fluids to filamentation. The high levels of albumin, amino acids, and N-acetylglucosamine in seminal fluid act synergistically as potent inducers of filamentous growth, even at atmospheric levels of CO2 and reduced temperatures (30 degrees C). Using a simplified in vitro model that mimics the natural introduction of seminal fluid into the vulvovaginal environment, a pulse of artificial seminal fluid (ASF) was found to exert an enduring potential to overcome the inhibitory efficacy of artificial vaginal fluid (AVF) on filamentation. These findings suggest that a transient but substantial change in the nutrient levels within the vulvovaginal environment during unprotected coitus can induce resident C. albicans cells to engage developmental programs associated with virulent growth.

  • 2.
    Hooijmaijers, Cornelis
    University of Auckland.
    Desiccation tolerance in red and green gametophytes of Jamesoniella colorata in relation to photoprotection.2008Inngår i: Planta, ISSN 0032-0935, E-ISSN 1432-2048, Vol. 227, nr 6, s. 1301-10Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study tests the hypothesis that red-leaved gametophytes of the liverwort Jamesoniella colorata (Lehm.) Schiffn., which are found in relatively dry habitats, are more desiccation tolerant than their green counterparts, which are found in moister environments, through superior photoprotective systems. The potential role of red foliar pigments in relation to water deficits is investigated by measuring cell water-relations, oxidative damage and photosynthetic responses. The presence of red pigments, or other cellular constituents, did not affect cell water-relations during dehydration and thus appear not to be involved in cell osmotic regulation. During drying, both colour morphs showed a similar non-photochemical quenching activity and did not experience significant oxidative damage, as measured by the amounts of ascorbate, malondialdehyde and photosynthetic pigments. However, the levels of oxidative damage increased directly upon rewetting the gametophytes, especially in low light conditions (25 µmol m(-2) s(-1)). The efficiency of photosystem II only recovered partially after severe water deficits in both phenotypes. However, the red gametophytes recovered faster and more completely from mild water deficits than did the greens. Moreover, they experienced significantly less photobleaching after rehydration in low light. It is suggested that red pigments and/or carotenoids in these gametophytes improve desiccation tolerance by alleviating photooxidative damage.

  • 3.
    Hooijmaijers, Cornelis
    et al.
    University of Auckland.
    Gould, K S
    Photoprotective pigments in red and green gametophytesof two New Zealand liverworts2007Inngår i: New Zealand Journal of Botany, ISSN 0028-825X, E-ISSN 1175-8643, Vol. 45, s. 451-461Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Gametophytes of Jamesoniella colorata (Jungermanniaceae) and Isotachis lyallii (Isotachidaceae) produce red leaves in exposed habitats, but green leaves in shaded environments. To understand the functional significance of this colour polymorphism, the anatomy, pigment composition, optical properties, and kinetics of chlorophyll a fluorescence were compared for red and green gametophytes. Both colour morphs were structurally similar, but the red leaves held unidentified red pigment(s) firmly associated with the cell wall. Green morphs contained more chlorophylls and carotenoids, and had higher ratios of chlorophylls to carotenoids, than did the red morphs. Red leaves absorbed 10% more photosynthetically active radiation, with a maximum at 540 nm, than did the green leaves. Under high irradiance, the red leaves maintained higher apparent quantum efficiencies for photosynthesis, and had larger photochemical and non-photochemical quenching values. The data indicate that red gametophytes have the greater potential to mitigate the damaging effects of high irradiance.

  • 4.
    Hooijmaijers, Cortwa
    University of Auckland.
    Membrane integrity, oxidative damage and chlorophyll fluorescenceduring dehydration of the thalloid liverwort Monoclea forsteri Hook2008Inngår i: Journal of Bryology, ISSN 0373-6687, E-ISSN 1743-2820, Vol. 30, s. 217-222Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Monoclea forsteri Hook. is a thalloid liverwort species that is found in damp habitats and can, therefore, be expected to be sensitive to dehydration. It does, however, have some unique chemical constituents and anatomical features that could play a role in dealing with the adverse effects of water deficits. Corresponding to the habitat, M. forsteri lost its turgor at high relative water content (RWC=0.90) and did not survive drying below 20% RWC. Moreover, the gametophytes showed an increase in malondialdehyde content and a depletion of the ascorbate pool during dehydration, indicating oxidative damage. Cellular constituents did not affect turgor pressure during drying and electrolyte leakage from the cells was greatly increased at RWC< 0.20. Photosynthetic processes seemed not to be affected by the loss of turgor, but a decline appeared to correlate with an increase in electrolyte leakage. A speedy and fully sustained recovery from dehydration was realized from water contents above 30% and seemed only to be possible if membrane integrity could be preserved. Anatomical characteristics within M. forsteri gametophytes deserve further investigation to better understand their physiological functions.

  • 5.
    Hooijmaijers, Cortwa
    et al.
    Chonnam National University.
    Rhee, Ji Ye
    Chonnam National University.
    Kwak, Kyung Jin
    Chonnam National University.
    Chung, Gap Chae
    Chonnam National University.
    Horie, Tomoaki
    Shinsu University.
    Katsuhara, Maki
    Okayama University.
    Kang, Hunseung
    Chonnam National University.
    Hydrogen peroxide permeability of plasma membrane aquaporins of Arabidopsis thaliana.2012Inngår i: Journal of plant research, ISSN 0918-9440, E-ISSN 1618-0860, Vol. 125, nr 1, s. 147-53Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Although aquaporins have been known to transport hydrogen peroxide (H2O2) across cell membranes, the H2O2-regulated expression patterns and the permeability of every family member of the plasma membrane intrinsic protein (PIP) toward H2Ohave not been determined. This study investigates the H2O2-regulated expression levels of all plasma membrane aquaporins of Arabidopsis thaliana (AtPIPs), and determines the permeability of every AtPIP for H2O2 in yeast. Hydrogen peroxide treatment of Arabidopsis down-regulated the expression of AtPIP2 subfamily in roots but not in leaves, whereas the expression of AtPIP1 subfamily was not affected by H2Otreatment. The growth and survival of yeast cells that expressed AtPIP2;2, AtPIP2;4, AtPIP2;5, or AtPIP2;7 was reduced in the presence of H2O2, while the growth of yeast cells expressing any other AtPIP family member was not affected by H2O2. These results show that only certain isoforms of AtPIPs whose expression is regulated by H2O2 treatment are permeable for H2O2 in yeast cells, and suggest that the integrated regulation of aquaporin expression by H2O2 and the capacity of individual aquaporin to transport H2O2 are important for plant response to H2O2.

  • 6. Vanholme, Bartel
    et al.
    Vanholme, Ruben
    Turumtay, Halbay
    Goeminne, Geert
    Cesarino, Igor
    Goubet, Florence
    Morreel, Kris
    Rencoret, Jorge
    Bulone, Vincent
    KTH, Skolan för bioteknologi (BIO), Glykovetenskap.
    Hooijmaijers, Cortwa
    KTH, Skolan för bioteknologi (BIO), Glykovetenskap.
    De Rycke, Riet
    Gheysen, Godelieve
    Ralph, John
    De Block, Marc
    Meulewaeter, Frank
    Boerjan, Wout
    Accumulation of N-Acetylglucosamine Oligomers in the Plant Cell Wall Affects Plant Architecture in a Dose-Dependent and Conditional Manner2014Inngår i: Plant Physiology, ISSN 0032-0889, E-ISSN 1532-2548, Vol. 165, nr 1, s. 290-308Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    To study the effect of short N-acetylglucosamine (GlcNAc) oligosaccharides on the physiology of plants, N-ACETYLGLUCOSAMINYLTRANSFERASE (NodC) of Azorhizobium caulinodans was expressed in Arabidopsis (Arabidopsis thaliana). The corresponding enzyme catalyzes the polymerization of GlcNAc and, accordingly, beta-1,4-GlcNAc oligomers accumulated in the plant. A phenotype characterized by difficulties in developing an inflorescence stem was visible when plants were grown for several weeks under short-day conditions before transfer to long-day conditions. In addition, a positive correlation between the oligomer concentration and the penetrance of the phenotype was demonstrated. Although NodC overexpression lines produced less cell wall compared with wildtype plants under nonpermissive conditions, no indications were found for changes in the amount of the major cell wall polymers. The effect on the cell wall was reflected at the transcriptome level. In addition to genes encoding cell wall-modifying enzymes, a whole set of genes encoding membrane- coupled receptor-like kinases were differentially expressed upon GlcNAc accumulation, many of which encoded proteins with an extracellular Domain of Unknown Function26. Although stress-related genes were also differentially expressed, the observed response differed from that of a classical chitin response. This is in line with the fact that the produced chitin oligomers were too small to activate the chitin receptor-mediated signal cascade. Based on our observations, we propose a model in which the oligosaccharides modify the architecture of the cell wall by acting as competitors in carbohydrate-carbohydrate or carbohydrate-protein interactions, thereby affecting noncovalent interactions in the cell wall or at the interface between the cell wall and the plasma membrane.

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