1
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Mantova M, Johnson DM, Antebi J, Beery S, Blumstein M, Cohen R, Defavari F, Feng X, Feuer E, Gersony J, Hammond WM, John G, Marchin RM, Mau Y, Miller B, Nibbelink C, Ossola A, Paquette A, Rademacher T, Rissanen K, Shemesh-Mayer E, Skelton R, Wilkening JV, Preisler Y. Monitoring urban trees across the world. Report from the Urban Trees Ecophysiology Network (UTEN) inaugural workshop: The Urban Trees Ecophysiology Network inaugural workshop, Georgia Center at the University of Georgia, Athens, United States, March 2023. New Phytol 2024; 242:1881-1885. [PMID: 38385799 DOI: 10.1111/nph.19621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Affiliation(s)
- Marylou Mantova
- Agronomy Department, University of Florida, Gainesville, FL, 32611, USA
| | - Daniel M Johnson
- Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, 30602, USA
| | | | - Sara Beery
- MIT EECS Faculty of AI and Decision Making, 15 Vassar St., Cambridge, MA, 02139, USA
| | - Meghan Blumstein
- Department of Civil and Environmental Engineering, MIT, 15 Vassar St., Cambridge, MA, 02139, USA
| | - Ron Cohen
- TreeTube Ltd, 13 Hapalmach KA, Ramat-Gan, 5590500, Israel
| | - Felipe Defavari
- ICT International Pty Ltd, 211 Mann St., Armidale, NSW, 2350, Australia
| | - Xue Feng
- Department of Civil, Environmental, and Geo-Engineering, University of Minnesota, Twin Cities, Minneapolis, MN, 55455, USA
- St Anthony Falls Laboratory, University of Minnesota, Twin Cities, Minneapolis, MN, 55414, USA
| | - Erez Feuer
- Institute of Environmental Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 7610001, Israel
| | - Jess Gersony
- Department of Biological Sciences, Smith College, Northampton, MA, 01060, USA
| | - William M Hammond
- Agronomy Department, University of Florida, Gainesville, FL, 32611, USA
| | - Grace John
- Department of Biology, College of Liberal Arts and Sciences, University of Florida, Gainesville, FL, 32611, USA
| | - Renée M Marchin
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, 2751, Australia
| | - Yair Mau
- Institute of Environmental Sciences, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 7610001, Israel
| | - Bill Miller
- LI-COR Biosciences Inc., Lincoln, NE, 68504, USA
| | - Clara Nibbelink
- Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, 30602, USA
| | - Alessandro Ossola
- Department of Plant Sciences, University of California Davis, Davis, CA, 95616, USA
- School of Agriculture, Food and Ecosystem Sciences, University of Melbourne, Parkville, Vic., 3010, Australia
| | - Alain Paquette
- Centre for Forest Research, Université du Québec à Montréal, Montreal, QC, Canada
| | - Tim Rademacher
- Institut des Sciences de la Forêt Tempérée, Université du Québec en Outaouais, Ripon, QC, J0V 1V0, Canada
- Centre ACER, Saint-Hyacinthe, QC, J2S 0B8, Canada
- Harvard Forest, Harvard University, Petersham, MA, 01366, USA
| | - Kaisa Rissanen
- Centre for Forest Research, Université du Québec à Montréal, Montreal, QC, Canada
| | - Einat Shemesh-Mayer
- Agriculture Research Organization (ARO), Volcani Center Hamakabim, Rishon LeZion, 7505101, Israel
| | - Robert Skelton
- SAEON Fynbos Node, Centre for Biodiversity Conservation, Kirstenbosch Gardens, Cape Town, 7708, South Africa
- Animal, Plant and Environmental Sciences, University of the Witwatersrand 1 Jan Smuts Ave, Braamfontein, Johannesburg, 2001, South Africa
| | - Jean V Wilkening
- Department of Civil, Environmental, and Geo-Engineering, University of Minnesota, Twin Cities, Minneapolis, MN, 55455, USA
- St Anthony Falls Laboratory, University of Minnesota, Twin Cities, Minneapolis, MN, 55414, USA
| | - Yakir Preisler
- Agriculture Research Organization (ARO), Volcani Center Hamakabim, Rishon LeZion, 7505101, Israel
- School of Engineering and Applied Science, Harvard University, Cambridge, MA, 02138, USA
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2
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Zhang X, Liu H, Rademacher T. Higher latewood to earlywood ratio increases resistance of radial growth to severe droughts in larch. Sci Total Environ 2024; 912:169165. [PMID: 38101621 DOI: 10.1016/j.scitotenv.2023.169165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 12/05/2023] [Accepted: 12/05/2023] [Indexed: 12/17/2023]
Abstract
As drought has caused great losses of tree growth across the world, the mechanism of how trees adapt to drought has been extensively investigated. However, how trees change their late- to earlywood ratio (LER) to adapt to severe drought events remains poorly understood. We used a network of Larix principis-rupprechtii earlywood and latewood width data from 1979 to 2018, covering most of the distribution of planted larch across North China, to investigate how latewood proportion affected trees' resistance to drought. The interactions among LER, minimum temperature, vapor pressure deficit (VPD), growing season length, and their contributions to drought resistant (Rt) were estimated using structural equation models. The results show a significant increase in LER of the juvenile wood throughout the first 15 growth rings after which it stabilizes. The LER decreased significantly with elevation for the juvenile wood. March-May temperature and VPD were the main determinant in the LER of mature wood. The sensitivity of radial growth to droughts was positively changed with LER when LER was below 0.50, but negatively changed with LER when LER is above 0.50. We confirmed that high LER increases resistance of tree growth to severe droughts in L. principis-rupprechtii. Our results highlight that a higher proportion of latewood is formed in dry years, and this high drought sensitivity of LER in turn led to an increased resistance to drought. This combination of reduced radial growth during dry years, while the latewood proportion remains increases maybe an adaptive strategy of larch trees to cope with severe droughts.
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Affiliation(s)
- Xianliang Zhang
- College of Forestry, Hebei Agricultural University, Baoding, China; College of Urban and Environmental Sciences, and PKU-Saihanba Station, Peking University, Beijing, China
| | - Hongyan Liu
- College of Urban and Environmental Sciences, and PKU-Saihanba Station, Peking University, Beijing, China.
| | - Tim Rademacher
- Institut des Sciences de la Forêt Tempérée, Université du Québec en Outaouais, J0V 1V0 Ripon, Québec, Canada; Centre ACER, J2S 0B8 Saint-Hyacinthe, Québec, Canada
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3
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Zhang X, Rademacher T, Liu H, Wang L, Manzanedo RD. Fading regulation of diurnal temperature ranges on drought-induced growth loss for drought-tolerant tree species. Nat Commun 2023; 14:6916. [PMID: 37903773 PMCID: PMC10616191 DOI: 10.1038/s41467-023-42654-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2023] [Accepted: 10/16/2023] [Indexed: 11/01/2023] Open
Abstract
Warming-induced droughts caused tree growth loss across the globe, leading to substantial carbon loss to the atmosphere. Drought-induced growth loss, however, can be regulated by changes in diurnal temperature ranges. Here, we investigated long term radial growth responses of 23 widespread distributed tree species from 2327 sites over the world and found that species' drought tolerances were significantly and positively correlated with diurnal temperature range-growth loss relationships for the period 1901-1940. Since 1940, this relationship has continued to fade, likely due to asymmetric day and night warming trends and the species' ability to deal with them. The alleviation of reduced diurnal temperature ranges on drought-induced growth loss was mainly found for drought resistant tree species. Overall, our results highlight the need to carefully consider diurnal temperature ranges and species-specific responses to daytime and nighttime warming to explore tree growth responses to current and future warmer and drier climates.
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Affiliation(s)
- Xianliang Zhang
- College of Forestry, Hebei Agricultural University, Baoding, 071001, China
- College of Urban and Environmental Sciences, Peking University, 100871, Beijing, China
| | - Tim Rademacher
- Institut des Sciences de la Forêt Tempérée, Université du Québec en Outaouais, Ripon, QC, J0V 1V0, Canada
- Centre ACER, Saint-Hyacinthe, QC, J2S 0B8, Canada
- Harvard Forest, Harvard University, Petersham, MA, 01366, USA
| | - Hongyan Liu
- College of Urban and Environmental Sciences, Peking University, 100871, Beijing, China.
| | - Lu Wang
- College of Urban and Environmental Sciences, Peking University, 100871, Beijing, China
| | - Rubén D Manzanedo
- Plant Ecology, Institute of Integrative Biology, D-USYS, ETH-Zürich, 8006, Zürich, Switzerland
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4
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Li W, Manzanedo RD, Jiang Y, Ma W, Du E, Zhao S, Rademacher T, Dong M, Xu H, Kang X, Wang J, Wu F, Cui X, Pederson N. Reassessment of growth-climate relations indicates the potential for decline across Eurasian boreal larch forests. Nat Commun 2023; 14:3358. [PMID: 37291110 PMCID: PMC10250375 DOI: 10.1038/s41467-023-39057-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Accepted: 05/23/2023] [Indexed: 06/10/2023] Open
Abstract
Larch, a widely distributed tree in boreal Eurasia, is experiencing rapid warming across much of its distribution. A comprehensive assessment of growth on warming is needed to comprehend the potential impact of climate change. Most studies, relying on rigid calendar-based temperature series, have detected monotonic responses at the margins of boreal Eurasia, but not across the region. Here, we developed a method for constructing temporally flexible and physiologically relevant temperature series to reassess growth-temperature relations of larch across boreal Eurasia. Our method appears more effective in assessing the impact of warming on growth than previous methods. Our approach indicates widespread and spatially heterogeneous growth-temperature responses that are driven by local climate. Models quantifying these results project that the negative responses of growth to temperature will spread northward and upward throughout this century. If true, the risks of warming to boreal Eurasia could be more widespread than conveyed from previous works.
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Affiliation(s)
- Wenqing Li
- Beijing Key Laboratory of Traditional Chinese Medicine Protection and Utilization, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, Zhuhai, 519087, China
- Key Laboratory of Land Consolidation and Rehabilitation, Land Consolidation and Rehabilitation Center, Ministry of Natural Resources, Beijing, 100035, China
| | - Rubén D Manzanedo
- Harvard Forest, Harvard University, Petersham, MA, 01366, USA
- Plant Ecology, Institute of Integrative Biology, D-USYS, ETH Zürich, 8006, Zürich, Switzerland
| | - Yuan Jiang
- Beijing Key Laboratory of Traditional Chinese Medicine Protection and Utilization, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, Zhuhai, 519087, China.
- State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China.
| | - Wenqiu Ma
- College of Engineering, China Agricultural University, Beijing, 100083, China
| | - Enzai Du
- State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China
| | - Shoudong Zhao
- State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, 100081, China
| | - Tim Rademacher
- Harvard Forest, Harvard University, Petersham, MA, 01366, USA
- Institut des Sciences de la Forêt Tempérée, Université du Québec en Outaouais, Ripon, J0V 1V0, QC, Canada
| | - Manyu Dong
- Beijing Key Laboratory of Traditional Chinese Medicine Protection and Utilization, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, Zhuhai, 519087, China
- State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China
| | - Hui Xu
- Department of Biostatistics and Epidemiology, School of Public Health and Health Sciences, University of Massachusetts Amherst, Amherst, MA, 01003, USA
| | - Xinyu Kang
- Department of Mathematics and Statistics, Boston University, 111 Cummington Mall, Boston, MA, 02215, USA
| | - Jun Wang
- Key Laboratory of Land Consolidation and Rehabilitation, Land Consolidation and Rehabilitation Center, Ministry of Natural Resources, Beijing, 100035, China
| | - Fang Wu
- Beijing Key Laboratory of Traditional Chinese Medicine Protection and Utilization, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, Zhuhai, 519087, China
- School of Systems Science, Beijing Normal University, Beijing, 100875, China
| | - Xuefeng Cui
- School of Systems Science, Beijing Normal University, Beijing, 100875, China
| | - Neil Pederson
- Harvard Forest, Harvard University, Petersham, MA, 01366, USA
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5
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Zhang X, Manzanedo RD, Lv P, Xu C, Hou M, Huang X, Rademacher T. Reduced diurnal temperature range mitigates drought impacts on larch tree growth in North China. Sci Total Environ 2022; 848:157808. [PMID: 35932855 DOI: 10.1016/j.scitotenv.2022.157808] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 07/26/2022] [Accepted: 07/31/2022] [Indexed: 06/15/2023]
Abstract
Forests are facing climate changes such as warmer temperatures, accelerated snowmelt, increased drought, as well as changing diurnal temperature ranges (DTR) and cloud cover regimes. How tree growth is influenced by the changes in daily to monthly temperatures and its associations with droughts has been extensively investigated, however, few studies have focused on how changes in sub-daily temperatures i.e., DTR, influence tree growth during drought events. Here, we used a network of Larix principis-rupprechtii tree-ring data from 1989 to 2018, covering most of the distribution of planted larch across North China, to investigate how DTR, cloud cover and their interactions influence the relationship between drought stress and tree growth. DTR showed a negative correlation with larch growth in 95 % of sites (rmean = -0.30, significant in 42 % of sites). Cloud cover was positively correlated with growth in 87 % of sites (rmean = 0.13, significant in 5 % of sites). Enhanced tree growth was found at lower DTR in the absence of severe drought. Our findings highlight that in the absence of severe droughts, reduced DTR benefits tree growth, while increased cloud cover tended to benefit tree growth only during severe drought periods. Given how DTR influences drought impacts on tree growth, net tree growth was found to be larger in regions with smaller DTR.
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Affiliation(s)
- Xianliang Zhang
- College of Forestry, Hebei Agricultural University, 071001 Baoding, China.
| | - Rubén D Manzanedo
- Plant Ecology, Institute of Integrative Biology, D-USYS, ETH-Zürich, 8006 Zürich, Switzerland
| | - Pengcheng Lv
- College of Forestry, Hebei Agricultural University, 071001 Baoding, China
| | - Chen Xu
- College of Landscape Architecture and Tourism, Hebei Agricultural University, 071001 Baoding, China
| | - Meiting Hou
- China Meteorological Administration Training Centre, China Meteorological Administration, 100081 Beijing, China
| | - Xuanrui Huang
- College of Forestry, Hebei Agricultural University, 071001 Baoding, China.
| | - Tim Rademacher
- Institut des Sciences de la Forêt tempérée, Université du Québec en Outaouais, J0V 1V0 Québec, Canada; Harvard Forest, Harvard University, 01366 MA, USA; School of Informatics and Cyber Security and Center for Ecosystem Science and Society, Northern Arizona University, 86011 AZ, USA
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6
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Rademacher T, Fonti P, LeMoine JM, Fonti MV, Bowles F, Chen Y, Eckes-Shephard AH, Friend AD, Richardson AD. Insights into source/sink controls on wood formation and photosynthesis from a stem chilling experiment in mature red maple. New Phytol 2022; 236:1296-1309. [PMID: 35927942 DOI: 10.1111/nph.18421] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 07/30/2022] [Indexed: 06/15/2023]
Abstract
Whether sources or sinks control wood growth remains debated with a paucity of evidence from mature trees in natural settings. Here, we altered carbon supply rate in stems of mature red maples (Acer rubrum) within the growing season by restricting phloem transport using stem chilling; thereby increasing carbon supply above and decreasing carbon supply below the restrictions, respectively. Chilling successfully altered nonstructural carbon (NSC) concentrations in the phloem without detectable repercussions on bulk NSC in stems and roots. Ring width responded strongly to local variations in carbon supply with up to seven-fold differences along the stem of chilled trees; however, concurrent changes in the structural carbon were inconclusive at high carbon supply due to large local variability of wood growth. Above chilling-induced bottlenecks, we also observed higher leaf NSC concentrations, reduced photosynthetic capacity, and earlier leaf coloration and fall. Our results indicate that the cambial sink is affected by carbon supply, but within-tree feedbacks can downregulate source activity, when carbon supply exceeds demand. Such feedbacks have only been hypothesized in mature trees. Consequently, these findings constitute an important advance in understanding source-sink dynamics, suggesting that mature red maples operate close to both source- and sink-limitation in the early growing season.
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Affiliation(s)
- Tim Rademacher
- Harvard Forest, Harvard University, Petersham, MA, 01366, USA
- School of Informatics, Computing and Cyber Systems and Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ, 86011, USA
- Institut des Sciences de la Forêt Tempérée, Université du Québec en Outaouais, Ripon, J0V 1V0, QC, Canada
| | - Patrick Fonti
- Swiss Federal Research Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, 8903, Switzerland
| | - James M LeMoine
- School of Informatics, Computing and Cyber Systems and Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ, 86011, USA
| | - Marina V Fonti
- Swiss Federal Research Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, 8903, Switzerland
- Institute of Ecology and Geography, Siberian Federal University, Krasnoyarsk, 660041, Russia
| | | | - Yizhao Chen
- Department of Geography, University of Cambridge, Cambridge, CB2 1BY, UK
| | - Annemarie H Eckes-Shephard
- Department of Geography, University of Cambridge, Cambridge, CB2 1BY, UK
- Department of Physical Geography and Ecosystem Science, Lund University, Lund, 223 62, Sweden
| | - Andrew D Friend
- Department of Geography, University of Cambridge, Cambridge, CB2 1BY, UK
| | - Andrew D Richardson
- School of Informatics, Computing and Cyber Systems and Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ, 86011, USA
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7
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Chen Y, Rademacher T, Fonti P, Eckes‐Shephard AH, LeMoine JM, Fonti MV, Richardson AD, Friend AD. Inter-annual and inter-species tree growth explained by phenology of xylogenesis. New Phytol 2022; 235:939-952. [PMID: 35488501 PMCID: PMC9325364 DOI: 10.1111/nph.18195] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 04/15/2022] [Indexed: 05/13/2023]
Abstract
Wood formation determines major long-term carbon (C) accumulation in trees and therefore provides a crucial ecosystem service in mitigating climate change. Nevertheless, we lack understanding of how species with contrasting wood anatomical types differ with respect to phenology and environmental controls on wood formation. In this study, we investigated the seasonality and rates of radial growth and their relationships with climatic factors, and the seasonal variations of stem nonstructural carbohydrates (NSC) in three species with contrasting wood anatomical types (red oak: ring-porous; red maple: diffuse-porous; white pine: coniferous) in a temperate mixed forest during 2017-2019. We found that the high ring width variability observed in both red oak and red maple was caused more by changes in growth duration than growth rate. Seasonal radial growth patterns did not vary following transient environmental factors for all three species. Both angiosperm species showed higher concentrations and lower inter-annual fluctuations of NSC than the coniferous species. Inter-annual variability of ring width varied by species with contrasting wood anatomical types. Due to the high dependence of annual ring width on growth duration, our study highlights the critical importance of xylem formation phenology for understanding and modelling the dynamics of wood formation.
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Affiliation(s)
- Yizhao Chen
- Department of GeographyUniversity of CambridgeCambridgeCB2 3ENUK
| | - Tim Rademacher
- School of Informatics, Computing, and Cyber SystemsNorthern Arizona UniversityFlagstaffAZ86011USA
- Center for Ecosystem Science and SocietyNorthern Arizona UniversityFlagstaffAZ86011USA
- Harvard ForestHarvard UniversityPetershamMA01366USA
- Institut des Sciences de la Forêt TempéréeUniversité du Québec en OutaouaisRiponQCJOV1V0Canada
| | - Patrick Fonti
- Swiss Federal Research Institute for Forest, Snow and Landscape Research WSLBirmensdorfCH‐8903Switzerland
| | - Annemarie H. Eckes‐Shephard
- Department of GeographyUniversity of CambridgeCambridgeCB2 3ENUK
- Department of Physical Geography and Ecosystem ScienceLund UniversityLundS‐223 62Sweden
| | - James M. LeMoine
- School of Informatics, Computing, and Cyber SystemsNorthern Arizona UniversityFlagstaffAZ86011USA
- Center for Ecosystem Science and SocietyNorthern Arizona UniversityFlagstaffAZ86011USA
| | - Marina V. Fonti
- Swiss Federal Research Institute for Forest, Snow and Landscape Research WSLBirmensdorfCH‐8903Switzerland
- Institute of Ecology and GeographySiberian Federal UniversitySvobodny pr 79Krasnoyarsk660041Russia
| | - Andrew D. Richardson
- School of Informatics, Computing, and Cyber SystemsNorthern Arizona UniversityFlagstaffAZ86011USA
- Center for Ecosystem Science and SocietyNorthern Arizona UniversityFlagstaffAZ86011USA
| | - Andrew D. Friend
- Department of GeographyUniversity of CambridgeCambridgeCB2 3ENUK
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8
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Rademacher T, Seyednasrollah B, Basler D, Cheng J, Mandra T, Miller E, Lin Z, Orwig DA, Pederson N, Pfister H, Wei D, Yao L, Richardson AD. The Wood Image Analysis and Dataset (WIAD): Open‐access visual analysis tools to advance the ecological data revolution. Methods Ecol Evol 2021. [DOI: 10.1111/2041-210x.13717] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tim Rademacher
- Harvard Forest Harvard University Petersham MA USA
- School of Informatics, Computing and Cyber Systems Northern Arizona University Flagstaff AZ USA
- Center for Ecosystem Science and Society Northern Arizona University Flagstaff AZ USA
| | - Bijan Seyednasrollah
- School of Informatics, Computing and Cyber Systems Northern Arizona University Flagstaff AZ USA
- Center for Ecosystem Science and Society Northern Arizona University Flagstaff AZ USA
| | - David Basler
- Harvard Forest Harvard University Petersham MA USA
- Department of Environmental Sciences University of Basel Basel Switzerland
| | | | - Tessa Mandra
- Harvard Forest Harvard University Petersham MA USA
| | - Elise Miller
- Harvard Forest Harvard University Petersham MA USA
- University of Minnesota Duluth Duluth MN USA
| | - Zuid Lin
- School of Engineering and Applied Sciences Harvard University Cambridge MA USA
| | | | | | - Hanspeter Pfister
- School of Engineering and Applied Sciences Harvard University Cambridge MA USA
| | - Donglai Wei
- School of Engineering and Applied Sciences Harvard University Cambridge MA USA
| | - Li Yao
- Southeast University Nanjing China
| | - Andrew D. Richardson
- School of Informatics, Computing and Cyber Systems Northern Arizona University Flagstaff AZ USA
- Center for Ecosystem Science and Society Northern Arizona University Flagstaff AZ USA
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9
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Jucker T, Amano T, Bell A, Garnett EE, Geffert JL, Guth MK, Hacket-Pain A, Luke SH, Mumby HS, Nunes M, Rademacher T, Rose DC, Schleicher J, Simmons BI, Zabala A, Mukherjee N. Steps to diversify priority-setting research in conservation: reflections on de Gracia 2021. Conserv Biol 2021; 35:1324-1326. [PMID: 34129717 DOI: 10.1111/cobi.13790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Accepted: 05/17/2021] [Indexed: 06/12/2023]
Affiliation(s)
- Tommaso Jucker
- School of Biological Sciences, University of Bristol, Bristol, UK
| | - Tatsuya Amano
- School of Biological Sciences, The University of Queensland, Brisbane, Queensland, Australia
| | - Alexandra Bell
- Department of Remote Sensing, Institute of Geography and Geology, University of Würzburg, Würzburg, Germany
| | - Emma E Garnett
- Cambridge Institute for Sustainability Leadership, University of Cambridge, Cambridge, UK
- Conservation Science Group, Department of Zoology, University of Cambridge, Cambridge, UK
| | | | - Miriam K Guth
- United Nations Environment Programme World Conservation Monitoring Centre, Cambridge, UK
| | - Andrew Hacket-Pain
- Department of Geography and Planning, School of Environmental Sciences, University of Liverpool, Liverpool, UK
| | - Sarah H Luke
- Department of Zoology, University of Cambridge, Cambridge, UK
| | - Hannah S Mumby
- Division of Ecology and Biodiversity, School of Biological Sciences, University of Hong Kong, Pok Fu Lam, Hong Kong
- Department of Politics and Public Administration, University of Hong Kong, Pok Fu Lam, Hong Kong
- Centre for African Ecology, School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Matheus Nunes
- Department of Geosciences and Geography, University of Helsinki, Helsinki, Finland
| | - Tim Rademacher
- Harvard Forest, Harvard University, Petersham, Massachusetts, USA
- Center for Ecosystem Science and Society and School of Informatics, Computing and Cyber Systems, Northern Arizona University, Flagstaff, Arizona, USA
| | - David C Rose
- School of Agriculture, Policy and Development, University of Reading, Earley, Reading, UK
| | | | - Benno I Simmons
- Centre for Ecology and Conservation, College of Life and Environmental Sciences, University of Exeter, Cornwall Campus, Penryn, UK
| | - Aiora Zabala
- Department of Land Economy, University of Cambridge, Cambridge, UK
| | - Nibedita Mukherjee
- Global Challenges, Department of Social and Political Sciences, College of Business, Arts and Social Sciences, Brunel University London, Uxbridge, UK
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10
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Rademacher T, Fonti P, LeMoine JM, Fonti MV, Basler D, Chen Y, Friend AD, Seyednasrollah B, Eckes-Shephard AH, Richardson AD. Manipulating phloem transport affects wood formation but not local nonstructural carbon reserves in an evergreen conifer. Plant Cell Environ 2021; 44:2506-2521. [PMID: 34043242 DOI: 10.1111/pce.14117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 05/16/2021] [Accepted: 05/18/2021] [Indexed: 06/12/2023]
Abstract
How variations in carbon supply affect wood formation remains poorly understood in particular in mature forest trees. To elucidate how carbon supply affects carbon allocation and wood formation, we attempted to manipulate carbon supply to the cambial region by phloem girdling and compression during the mid- and late-growing season and measured effects on structural development, CO2 efflux and nonstructural carbon reserves in stems of mature white pines. Wood formation and stem CO2 efflux varied with a location relative to treatment (i.e., above or below the restriction). We observed up to twice as many tracheids formed above versus below the treatment after the phloem transport manipulation, whereas the cell-wall area decreased only slightly below the treatments, and cell size did not change relative to the control. Nonstructural carbon reserves in the xylem, needles and roots were largely unaffected by the treatments. Our results suggest that low and high carbon supply affects wood formation, primarily through a strong effect on cell proliferation, and respiration, but local nonstructural carbon concentrations appear to be maintained homeostatically. This contrasts with reports of decoupling of source activity and wood formation at the whole-tree or ecosystem level, highlighting the need to better understand organ-specific responses, within-tree feedbacks, as well as phenological and ontogenetic effects on sink-source dynamics.
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Affiliation(s)
- Tim Rademacher
- School of Informatics, Computing, and Cyber Security, Northern Arizona University, Flagstaff, Arizona, USA
- Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, Arizona, USA
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, USA
| | - Patrick Fonti
- Swiss Federal Research Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland
| | - James M LeMoine
- School of Informatics, Computing, and Cyber Security, Northern Arizona University, Flagstaff, Arizona, USA
- Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, Arizona, USA
| | - Marina V Fonti
- Swiss Federal Research Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland
- Institute of Ecology and Geography, Siberian Federal University, Krasnoyarsk, Russian Federation
| | - David Basler
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, USA
| | - Yizhao Chen
- Department of Geography, University of Cambridge, Cambridge, UK
| | - Andrew D Friend
- Department of Geography, University of Cambridge, Cambridge, UK
| | - Bijan Seyednasrollah
- School of Informatics, Computing, and Cyber Security, Northern Arizona University, Flagstaff, Arizona, USA
- Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, Arizona, USA
| | | | - Andrew D Richardson
- School of Informatics, Computing, and Cyber Security, Northern Arizona University, Flagstaff, Arizona, USA
- Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, Arizona, USA
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11
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Holland T, Sack M, Rademacher T, Schmale K, Altmann F, Stadlmann J, Fischer R, Hellwig S. Optimal nitrogen supply as a key to increased and sustained production of a monoclonal full-size antibody in BY-2 suspension culture. Biotechnol Bioeng 2010; 107:278-89. [PMID: 20506104 DOI: 10.1002/bit.22800] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Plant cell cultures have been used as expression hosts for recombinant proteins for over two decades. The quality of plant cell culture-produced proteins such as full-size monoclonal antibodies has been shown to be excellent in terms of protein folding and binding activity, but the productivity and yield fell short of what was achieved using mammalian cell culture, in which the key to gram-per-liter expression levels was strain selection and medium/process optimization. We carried out an extensive media analysis and optimization for the production of the full-size human anti-HIV antibody 2G12 in N. tabacum cv. BY-2. Nitrogen source and availability was found to be one key factor for the volumetric productivity of plant cell cultures. Increased amounts of nitrate in the culture medium had a dramatic impact on protein yields, resulting in a 10-20-fold increase in product accumulation through a combination of enhanced secretion and higher stability. The results were scalable from shake flasks to stirred-tank bioreactors, where the maximum yield per cultivation volume was 8 mg L(-1) over 7 days. During the stationary phase, antibody levels were 150-fold higher in nitrogen-enriched medium compared to standard medium. The enhanced medium appeared not to affect antibody quality and activity, as determined by Western blots, surface plasmon resonance binding assays and N-glycan analysis.
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Affiliation(s)
- T Holland
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Forckenbeckstrasse 6, 52074 Aachen, Germany
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12
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Maclean J, Koekemoer M, Olivier AJ, Stewart D, Hitzeroth II, Rademacher T, Fischer R, Williamson AL, Rybicki EP. Optimization of human papillomavirus type 16 (HPV-16) L1 expression in plants: comparison of the suitability of different HPV-16 L1 gene variants and different cell-compartment localization. J Gen Virol 2007; 88:1460-1469. [PMID: 17412974 DOI: 10.1099/vir.0.82718-0] [Citation(s) in RCA: 152] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Virus-like particle-based vaccines for high-risk human papillomaviruses (HPVs) appear to have great promise; however, cell culture-derived vaccines will probably be very expensive. The optimization of expression of different codon-optimized versions of the HPV-16 L1 capsid protein gene in plants has been explored by means of transient expression from a novel suite of Agrobacterium tumefaciens binary expression vectors, which allow targeting of recombinant protein to the cytoplasm, endoplasmic reticulum (ER) or chloroplasts. A gene resynthesized to reflect human codon usage expresses better than the native gene, which expresses better than a plant-optimized gene. Moreover, chloroplast localization allows significantly higher levels of accumulation of L1 protein than does cytoplasmic localization, whilst ER retention was least successful. High levels of L1 (>17% total soluble protein) could be produced via transient expression: the protein assembled into higher-order structures visible by electron microscopy, and a concentrated extract was highly immunogenic in mice after subcutaneous injection and elicited high-titre neutralizing antibodies. Transgenic tobacco plants expressing a human codon-optimized gene linked to a chloroplast-targeting signal expressed L1 at levels up to 11% of the total soluble protein. These are the highest levels of HPV L1 expression reported for plants: these results, and the excellent immunogenicity of the product, significantly improve the prospects of making a conventional HPV vaccine by this means.
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Affiliation(s)
- J Maclean
- Department of Molecular and Cell Biology, University of Cape Town, Cape Town, South Africa
- Institute of Infectious Disease and Molecular Medicine, Faculty of Health Science, University of Cape Town, Cape Town, South Africa
| | - M Koekemoer
- Department of Molecular and Cell Biology, University of Cape Town, Cape Town, South Africa
| | - A J Olivier
- Biovac Institute, Pinelands, Cape Town, South Africa
| | - D Stewart
- Institute of Infectious Disease and Molecular Medicine, Faculty of Health Science, University of Cape Town, Cape Town, South Africa
| | - I I Hitzeroth
- Institute of Infectious Disease and Molecular Medicine, Faculty of Health Science, University of Cape Town, Cape Town, South Africa
| | | | - R Fischer
- Fraunhofer Institute, Aachen, Germany
| | - A-L Williamson
- Institute of Infectious Disease and Molecular Medicine, Faculty of Health Science, University of Cape Town, Cape Town, South Africa
| | - E P Rybicki
- Department of Molecular and Cell Biology, University of Cape Town, Cape Town, South Africa
- Institute of Infectious Disease and Molecular Medicine, Faculty of Health Science, University of Cape Town, Cape Town, South Africa
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13
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Häusler RE, Rademacher T, Li J, Lipka V, Fischer KL, Schubert S, Kreuzaler F, Hirsch HJ. Single and double overexpression of C(4)-cycle genes had differential effects on the pattern of endogenous enzymes, attenuation of photorespiration and on contents of UV protectants in transgenic potato and tobacco plants. J Exp Bot 2001; 52:1785-803. [PMID: 11520867 DOI: 10.1093/jexbot/52.362.1785] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
To improve the efficiency of CO(2) fixation in C(3) photosynthesis, C(4)-cycle genes were overexpressed in potato and tobacco plants either individually or in combination. Overexpression of the phosphoenolpyruvate carboxylase (PEPC) gene (ppc) from Corynebacterium glutamicum (cppc) or from potato (stppc, deprived of the phosphorylation site) in potato resulted in a 3-6-fold induction of endogenous cytosolic NADP malic enzyme (ME) and an increase in the activities of NAD-ME (3-fold), NADP isocitrate dehydrogenase (ICDH), pyruvate kinase (PK), NADP glycerate-3-P dehydrogenase (NADP-GAPDH), and PEP phosphatase (PEPP). In double transformants overexpressing cppc and chloroplastic NADP-ME from Flaveria pringlei (fpMe1), cytosolic NADP-ME was less induced and pleiotropic effects were diminished. There were no changes in enzyme pattern in single fpMe1 overexpressors. In cppc overexpressors of tobacco, the increase in endogenous cytosolic NADP-ME activity was small and changes in other enzymes were less pronounced. Determinations of the CO(2) compensation point (Gamma*) as well as temperature and oxygen effects on photosynthesis produced variational data suggesting that the desired decline in photorespiration occurred only under certain experimental conditions. Double transformants of potato (cppc/fpMe1) exhibited the most consistent attenuating effect on photorespiration. In contrast, photorespiration in tobacco plants appeared to be diminished most in single cppc overexpressors rather than in double transformants (cppc/fpMe1). In tobacco, introduction of the PEP carboxykinase (PEPCK) gene from the bacterium Sinorhizobium meliloti (pck) had little effect on photosynthetic parameters in single (pck) and double transformants (cppc/pck). In transgenic potato plants, increased PEPC activities resulted in a decline in UV protectants (flavonoids) in single cppc or stppc transformants, but not in double transformants (cppc/fpMe1). PEP provision to the shikimate pathway inside the plastids, from which flavonoids derive, might be restricted only in single PEPC overexpressors.
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Affiliation(s)
- R E Häusler
- Botanisches Institut der Universität zu Köln, Gyrhofstrasse 15, D-50931 Köln, Germany.
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14
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Gehlen J, Panstruga R, Smets H, Merkelbach S, Kleines M, Porsch P, Fladung M, Becker I, Rademacher T, Häusler RE, Hirsch HJ. Effects of altered phosphoenolpyruvate carboxylase activities on transgenic C3 plant Solanum tuberosum. Plant Mol Biol 1996; 32:831-48. [PMID: 8980535 DOI: 10.1007/bf00020481] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Phosphoenolpyruvate carboxylase (PEPC) genes from Corynebacterium glutamicum (cppc), Escherichia coli (eppc) or Flaveria trinervia (fppc) were transferred to Solanum tuberosum. Plant regenerants producing foreign PEPC were identified by Western blot analysis. Maximum PEPC activities measured in eppc and fppc plants grown in the greenhouse were doubled compared to control plants. For cppc a transgenic plant line could be selected which exhibited a fourfold increase in PEPC activity. In the presence of acetyl-CoA, a known activator of the procaryotic PEPC, a sixfold higher activity level was observed. In cppc plants grown in axenic culture PEPC activities were even higher. There was a 6-fold or 12-fold increase in the PEPC activities compared to the controls measured in the absence or presence of acetyl-CoA, respectively. Comparable results were obtained by transient expression in Nicotiana tabacum protoplasts. PEPC of C. glutamicum (PEPC C.g.) in S. tuberosum leaf extracts displays its characteristic K(m) (PEP) value. Plant growth was examined with plants showing high expression of PEPC and, moreover, with a plant cell line expressing an antisense S. tuberosum (anti-sppc) gene. In axenic culture the growth rate of a cppc plant cell line was appreciably diminished, whereas growth rates of an anti-sppc line were similar or slightly higher than in controls. Malate levels were increased in cppc plants and decreased in antisense plants. There were no significant differences in photosynthetic electron transport or steady state CO2 assimilation between control plants and transformants overexpressing PEPC C.g. or anti-sppc plants. However, a prolonged dark treatment resulted in a delayed induction of photosynthetic electron transport in plants with less PEPC. Rates of CO2 release in the dark determined after a 45 min illumination period at a high proton flux density were considerably enhanced in cppc plants and slightly diminished in anti-sppc plants. When CO2 assimilation rates were corrected for estimated rates of mitochondrial respiration in the light, the electron requirement for CO2 assimilation determined in low CO2 was slightly lower in transformants with higher PEPC, whereas transformants with decreased PEPC exhibited an appreciably elevated electron requirement. The CO2 compensation point remained unchanged in plants (cppc) with high PEPC activity, but might be increased in an antisense plant cell line. Stomatal opening was delayed in antisense plants, but was accelerated in plants overexpressing PEPC C.g. compared to the controls.
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Affiliation(s)
- J Gehlen
- Institut für Biologie I (Botanik/Molekulargenetik), Rheinisch Westfälische Technische Hochschule, Aachen, Germany
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15
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Abstract
Pregnancy serum contains a factor or factors which suppress T lymphocyte proliferation, although the identity of the factor(s) is still unclear. We have demonstrated that the immunosuppressive activity of pregnancy sera can be destroyed by treatment with periodate which oxidises protein-linked oligosaccharides. Similar effects have been noted with uromodulin, a potent immunosuppressive glycoprotein initially isolated from pregnancy urine. We find, however, that uromodulin is present in both pregnancy and non-pregnancy sera, and that removal of uromodulin from pregnancy serum by lectin affinity chromatography is not associated with loss of activity, ruling out this glycoprotein as the immunosuppressive factor. The possible role of protein-linked oligosaccharides of other serum glycoproteins in causing the pregnancy-related immunosuppression is discussed.
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Affiliation(s)
- P Arkwright
- Oxford Glycobiology Unit, Department of Biochemistry, U.K
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16
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Sumar N, Colaço CB, Bodman KB, Parekh R, Williams P, Dwek R, Rademacher T, Isenberg DA, Soltys A, Hay FC. Abnormalities in the glycosylation of IgG in spouses of patients with rheumatoid arthritis. A family study. J Autoimmun 1991; 4:907-14. [PMID: 1812895 DOI: 10.1016/0896-8411(91)90053-f] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Forty-seven members of eight families with a rheumatoid proband were analysed for abnormal glycosylation of IgG. The results (%G(o) which is the percentage of oligosaccharide chains lacking galactose) were corrected for age and expressed as SD units about the mean for the normal population. Seven of 8 probands, 3/8 spouses, 3/5 RA relatives and 4/26 non-RA relatives had %G(o) values greater than 1SD above the age corrected mean for the normal control population (P less than 0.001, less than 0.01, less than 0.005 and greater than 0.5 respectively). A further 13 spouse pairs were studied. Ten of 13 probands and 8/13 spouses had %G(o) values greater than 1SD above the mean (P less than 0.001 and less than 0.001 respectively). Thus in total, a strikingly high number of unaffected spouses had high %G(o) values (11/21). IgM, IgA and IgG rheumatoid factors were studied. While RA patients' sera showed a correlation between IgM and IgA rheumatoid factors and %G(o), (IgM, r = 0.41 0.05 greater than P greater than 0.02, IgA, r = 0.36, P = 0.05), no correlation between IgG RF and %G(o) was noted in the RA patients. No correlation was found between any of the RF classes and %G(o) in spouses and non-RA relatives.
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Affiliation(s)
- N Sumar
- Department of Immunology, University College, Middlesex Hospital School of Medicine, London, UK
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17
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Rook G, Thompson S, Buckley M, Elson C, Brealey R, Lambert C, White T, Rademacher T. The role of oil and agalactosyl IgG in the induction of arthritis in rodent models. Eur J Immunol 1991; 21:1027-32. [PMID: 2019285 DOI: 10.1002/eji.1830210425] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The proportion of agalactosyl IgG [Gal(O)] is raised in human rheumatoid arthritis and tuberculosis. We report here that injection of pristane into the peritoneal cavities of mice on days 0 and 50, which is known to induce plasmacytomas and arthritis, also induced a rise in the proportion of Gal(O), correlating with a simultaneous rise in the level of IgG antibody binding to the 65-kDa heat-shock protein of Mycobacterium bovis (hsp65). Arthritis developed in a proportion of those CBA/Igb mice with the highest percentage of Gal(O). Pretreatment with 50 micrograms of recombinant mycobacterial hsp65 intraperitoneal (i.p.) on day -10, or with 500 rad irradiation on day -2 before the first of the two injections of pristane reduced the incidence of arthritis from 24% in control animals, to 5.3% and 0.4%, respectively. The reduced incidence of disease correlated with smaller rises in the % Gal(O) at 50-75 days, although levels at 150-200 days were not affected. The arthritogenic effect of oil was not confined to the pristane model, since a single i.p. injection of oil 21 days before immunizing DBA/1 mice with type II collagen reduced the mean day of onset of this arthritis, [which we have previously shown to correlate with raised % Gal(O)], from 38 to 15 days (p less than 0.001). One interpretation is that an autoimmunogenic stimulus, given when % Gal(O) is raised, is more likely to evoke disease. Since oil granulomata are known to secrete interleukin 6, which has B cell-regulatory properties and is secreted by rheumatoid synovial cells, we tested sera from interleukin 6-transgenic mice, and found a strikingly raised percentage of Gal(O). We suggest, therefore, that the role of oil in the induction of arthritis is the dysregulation of cytokine release of which a raised percentage of Gal(O) may be a direct or indirect consequence, associated with an increased susceptibility to autoimmunogenic stimuli.
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Affiliation(s)
- G Rook
- Department of Medical Microbiology, University College, Middlesex School of Medicine, London
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18
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Abstract
The proportion of oligosaccharide chains on the Fc fragment of IgG which terminate with N-acetylglucosamine (GlcNAc) rather than galactose is increased in rheumatoid arthritis and tuberculosis, and in sera from patients with Crohn's disease, probably because of decreased activity of a galactosyltransferase in B lymphocytes. We have assayed the prevalence of agalactosyl oligosaccharides on IgG in sera from 67 patients with inflammatory bowel disease (32 ulcerative colitis and 35 Crohn's disease). The prevalence of agalactosyl IgG significantly increases in the majority of Crohn's patients (19/35 patients), and correlates with the level of C-reactive protein (r = 0.79), and inversely with the concentration of serum albumin. Sera from ulcerative colitis patients show less frequent (nine of 32) and less marked rises in agalactosyl IgG, and sera with high C-reactive protein values can contain normal levels. Thus in ulcerative colitis no correlation was seen between the two assays. The diseases in which the percentage of agalactosyl IgG is raised (rheumatoid arthritis, tuberculosis, Crohn's disease and some ulcerative colitis) are characterised by simultaneous T cell mediated granulomatous tissue damage, and acute phase responses. Levels are normal in less tissue damaging granulomatous conditions, including sarcoidosis, and leprosy (except during episodes of erythema nodosum leprosum). We suggest therefore that a raised percentage of agalactosyl IgG is a correlate of a particular type of T cell mediated pathology which may be relevant to the pathogenesis of inflammatory bowel disease.
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Affiliation(s)
- R Dubé
- St Mark's Hospital, London
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19
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Filley E, Andreoli A, Steele J, Waters M, Wagner D, Nelson D, Tung K, Rademacher T, Dwek R, Rook GA. A transient rise in agalactosyl IgG correlating with free interleukin 2 receptors, during episodes of erythema nodosum leprosum. Clin Exp Immunol 1989; 76:343-7. [PMID: 2787714 PMCID: PMC1541882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The proportion of oligosaccharide chains on the Fc fragment of IgG which terminate with N-acetylglucosamine and not galactose (%GO) has previously been shown to be raised in rheumatoid arthritis (RA), Crohn's disease (CD) and tuberculosis (Tb), but to be normal in sarcoidosis (SA), and in both lepromatous and tuberculoid leprosy. However we have now studied %GO in sequential serum samples collected from lepromatous leprosy patients undergoing episodes of erythema nodosum leprosum (ENL). During ENL %GO is transiently raised, and this rise parallels an increase in circulating interleukin 2 receptors (IL-2R). These findings confirm that changes in T cell function occur during ENL. Moreover it appears that %GO rises when there is, simultaneously, T-cell-mediated tissue damage and an acute phase response (RA, CD, Tb, ENL), but not when there is an acute phase response without major T cell involvement, or chronic T cell activity alone (SA, and tuberculoid leprosy). We suggest therefore that %GO is an indicator of a type of T cell activity with broad immunopathological implications.
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Affiliation(s)
- E Filley
- Department of Medical Microbiology, University College, London
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20
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Parekh R, Isenberg D, Rook G, Roitt I, Dwek R, Rademacher T. A comparative analysis of disease-associated changes in the galactosylation of serum IgG. J Autoimmun 1989; 2:101-14. [PMID: 2504180 DOI: 10.1016/0896-8411(89)90148-0] [Citation(s) in RCA: 159] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- R Parekh
- Department of Biochemistry, University of Oxford, UK
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21
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Abstract
In a study of 151 normal, healthy individuals of both sexes varying in age from 1-70 yr, it was found that the relative incidence of agalactosyl (with both outer arms terminating in N-acetylglucosamine) N-linked oligosaccharides on total serum IgG decreased from birth to a minimum (at 25 yr of age) and then increased with age. The relative incidence of digalactosyl structures varied inversely to this, and the relative incidence of monogalactosyl structures was constant. Galactosylation of the N-linked oligosaccharides of the human serum IgG of normal individuals is therefore an age-related molecular parameter. Several reports have suggested that rheumatoid arthritis is associated with a decreased galactosylation of serum IgG (3-5). The normal variation in galactosylation with age as described here allows a true assessment of disease-associated changes in this parameter, and raises the possibility that one of the lesions in rheumatoid arthritis is an accelerated aging of the immune system. In addition, heterogeneity within age groups may be due to intrinsic differences in genetic endowment, or may reflect the impact of extrinsic factors (8).
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Affiliation(s)
- R Parekh
- Department of Biochemistry, University of Oxford, United Kingdom
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22
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Rook GA, Steele J, Rademacher T. A monoclonal antibody raised by immunising mice with group A streptococci binds to agalactosyl IgG from rheumatoid arthritis. Ann Rheum Dis 1988; 47:247-50. [PMID: 2451483 PMCID: PMC1003493 DOI: 10.1136/ard.47.3.247] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
It was shown recently that the IgG of patients with rheumatoid arthritis tends to lack the terminal galactose normally present on the conserved N-linked oligosaccharide situated on the CH2 domain. This results in the exposure of a terminal N-acetylglucosamine linked beta 1-2 to mannose. It is reported here that mice immunised with the peptidoglycan/polysaccharide complex of group A streptococci can be used as a source of monoclonal antibodies binding to this epitope. It may be significant that the organism responsible for rheumatic fever evokes antibodies binding to an abnormality of IgG found in rheumatoid arthritis.
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Affiliation(s)
- G A Rook
- Department of Medical Microbiology, University College, London
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23
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Rademacher T. Never too old: a retired nurse reaches out to drunks and prostitutes. J Christ Nurs 1987; 4:15-7. [PMID: 2435885 DOI: 10.1097/00005217-198704010-00005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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