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Celis-Plá PSM, Kappes JL, Figueroa FL, Pereda SV, Villegas K, Altamirano R, Hernández-González MC, Buschmann AH. Solar Radiation as an Isolated Environmental Factor in an Experimental Mesocosm Approach for Studying Photosynthetic Acclimation of Macrocystis pyrifera (Ochrophyta). Front Plant Sci 2021; 12:622150. [PMID: 34276713 PMCID: PMC8283697 DOI: 10.3389/fpls.2021.622150] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 06/04/2021] [Indexed: 05/17/2023]
Abstract
Solar radiation effects on the ecophysiology and biochemical responses of the brown macroalga Macrocystis pyrifera (L.) C. Agardh were evaluated using a mesocosm approach in Southern Chile. Treatments with different radiation attenuations were simulated with three vertical attenuation coefficients: (1) total (Kd = 0.8 m-1), (2) attenuated (Kd = 1.2 m-1), and (3) low (Kd = 1.6 m-1) radiation levels. Nutrient concentration and temperature did not show differences under the three light conditions. Photosynthetic activity was estimated by in vivo chlorophyll a (Chla) fluorescence under the three light treatments as an isolated physical factor in both in situ solar radiation in the field. This was achieved using a pulse amplitude-modulated (PAM) fluorometera-Diving PAM (in situ). Photosynthetic activity and biochemical composition were measured in winter during two daily cycles (1DC and 2DC) in different parts of the thalli of the plant: (1) canopy zone, (2) middle zone, and (3) down zone, associated with different depths in the mesocosm system. Nevertheless, the in situ electron transport rate (ETR in situ ) was higher in the exposed thalli of the canopy zone, independent of the light treatment conditions. The concentration of phenolic compounds (PC) increases in the down zone in the first daily cycle, and it was higher in the middle zone in the second daily cycle. The Chla increased in the morning time under total and attenuated radiation in the first daily cycle. Solar radiation increasing at midday prompted the photoinhibition of photosynthesis in the canopy zone but also an increase in productivity and phenol content. Therefore, light attenuation in the water column drove key differences in the photo-physiological responses of M. pyrifera, with the highest productivity occurring in thalli positioned in the canopy zone when exposed to solar irradiance.
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Affiliation(s)
- Paula S. M. Celis-Plá
- Laboratory of Aquatic Environmental Research (LACER), Centro de Estudios Avanzados, Universidad de Playa Ancha, Viña del Mar, Chile
- HUB Ambiental Universidad de Playa Ancha (UPLA), Vicerrectoría de Investigación Postgrado e Innovación, Universidad de Playa Ancha, Valparaíso, Chile
- Paula S. M. Celis-Plá
| | - José Luis Kappes
- Centro de Investigación y Desarrollo de Ambientes y Recursos Costeros (Centro i-mar) and Centro de Biotecnología y Bioingenería (CeBiB), Universidad de Los Lagos, Puerto Montt, Chile
| | - Félix L. Figueroa
- Department of Ecology and Geology, Faculty of Sciences, Institute of Biotechnology and Blue Development (IBYDA), University of Malaga, Malaga, Spain
| | - Sandra V. Pereda
- Centro de Investigación y Desarrollo de Ambientes y Recursos Costeros (Centro i-mar) and Centro de Biotecnología y Bioingenería (CeBiB), Universidad de Los Lagos, Puerto Montt, Chile
| | - Karina Villegas
- Centro de Investigación y Desarrollo de Ambientes y Recursos Costeros (Centro i-mar) and Centro de Biotecnología y Bioingenería (CeBiB), Universidad de Los Lagos, Puerto Montt, Chile
| | - Robinson Altamirano
- Centro de Investigación y Desarrollo de Ambientes y Recursos Costeros (Centro i-mar) and Centro de Biotecnología y Bioingenería (CeBiB), Universidad de Los Lagos, Puerto Montt, Chile
| | - María Carmen Hernández-González
- Centro de Investigación y Desarrollo de Ambientes y Recursos Costeros (Centro i-mar) and Centro de Biotecnología y Bioingenería (CeBiB), Universidad de Los Lagos, Puerto Montt, Chile
| | - Alejandro H. Buschmann
- Centro de Investigación y Desarrollo de Ambientes y Recursos Costeros (Centro i-mar) and Centro de Biotecnología y Bioingenería (CeBiB), Universidad de Los Lagos, Puerto Montt, Chile
- *Correspondence: Alejandro H. Buschmann
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Buschmann AH, Villegas K, Pereda SV, Camus C, Kappes JL, Altamirano R, Vallejos L, Hernández-González MC. Enhancing yield on Macrocystis pyrifera (Ochrophyta): The effect of gametophytic developmental strategy. ALGAL RES 2020. [DOI: 10.1016/j.algal.2020.102124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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San Martin I, Varela N, Gaete M, Villegas K, Osorio M, Tapia JC, Antonelli M, Mancilla E, Lian JB, Stein JL, Stein GS, van Wijnen AJ, Galindo M. Impaired cell cycle regulation of the osteoblast-related heterodimeric transcription factor Runx2-Cbfbeta in osteosarcoma cells. J Cell Physiol 2009; 221:560-71. [PMID: 19739101 PMCID: PMC3066433 DOI: 10.1002/jcp.21894] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Bone formation and osteoblast differentiation require the functional expression of the Runx2/Cbfbeta heterodimeric transcription factor complex. Runx2 is also a suppressor of proliferation in osteoblasts by attenuating cell cycle progression in G(1). Runx2 levels are modulated during the cell cycle, which are maximal in G(1) and minimal beyond the G(1)/S phase transition (S, G(2), and M phases). It is not known whether Cbfbeta gene expression is cell cycle controlled in preosteoblasts nor how Runx2 or Cbfbeta are regulated during the cell cycle in bone cancer cells. We investigated Runx2 and Cbfbeta gene expression during cell cycle progression in MC3T3-E1 osteoblasts, as well as ROS17/2.8 and SaOS-2 osteosarcoma cells. Runx2 protein levels are reduced as expected in MC3T3-E1 cells arrested in late G(1) (by mimosine) or M phase (by nocodazole), but not in cell cycle arrested osteosarcoma cells. Cbfbeta protein levels are cell cycle independent in both osteoblasts and osteosarcoma cells. In synchronized MC3T3-E1 osteoblasts progressing from late G1 or mitosis, Runx2 levels but not Cbfbeta levels are cell cycle regulated. However, both factors are constitutively elevated throughout the cell cycle in osteosarcoma cells. Proteasome inhibition by MG132 stabilizes Runx2 protein levels in late G(1) and S in MC3T3-E1 cells, but not in ROS17/2.8 and SaOS-2 osteosarcoma cells. Thus, proteasomal degradation of Runx2 is deregulated in osteosarcoma cells. We propose that cell cycle control of Runx2 gene expression is impaired in osteosarcomas and that this deregulation may contribute to the pathogenesis of osteosarcoma.
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Affiliation(s)
- Inga San Martin
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (I.C.B.M.), Faculty of Medicine, University of Chile, Santiago, Chile
| | - Nelson Varela
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (I.C.B.M.), Faculty of Medicine, University of Chile, Santiago, Chile
| | - Marcia Gaete
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (I.C.B.M.), Faculty of Medicine, University of Chile, Santiago, Chile
| | - Karina Villegas
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (I.C.B.M.), Faculty of Medicine, University of Chile, Santiago, Chile
| | - Mariana Osorio
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (I.C.B.M.), Faculty of Medicine, University of Chile, Santiago, Chile
| | - Julio C. Tapia
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (I.C.B.M.), Faculty of Medicine, University of Chile, Santiago, Chile
| | - Marcelo Antonelli
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (I.C.B.M.), Faculty of Medicine, University of Chile, Santiago, Chile
| | - Edna Mancilla
- Program of Pathophysiology, Institute of Biomedical Sciences (I.C.B.M.), Faculty of Medicine, University of Chile, Santiago, Chile
| | - Jane B. Lian
- Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, MA 01655-0105
| | - Janet L. Stein
- Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, MA 01655-0105
| | - Gary S Stein
- Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, MA 01655-0105
| | - Andre J. van Wijnen
- Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, MA 01655-0105
| | - Mario Galindo
- Program of Cellular and Molecular Biology, Institute of Biomedical Sciences (I.C.B.M.), Faculty of Medicine, University of Chile, Santiago, Chile
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