1
|
Semeniuk D, Boerner KE, Brain U, Ryan D, Oberlander TF. The Role of Parenting Stress as a Mediator in the Relationship Between Postpartum Depressive Symptoms and Early Childhood Internalizing Behaviour. Child Psychiatry Hum Dev 2023:10.1007/s10578-023-01596-9. [PMID: 37682359 DOI: 10.1007/s10578-023-01596-9] [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] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 08/15/2023] [Indexed: 09/09/2023]
Abstract
Parenting stress occurs when demands of the parenting role are perceived as overwhelming and has been proposed as a mechanism through which postpartum mood disturbances may impact child psychopathology. In a prospective longitudinal birth cohort of 111 birthing parent-child dyads, this study examined whether the relationship between birthing parents' mood symptoms in infancy (3 months postpartum) and their child's internalizing behaviour in early childhood (3 and 6 years old) is mediated by parenting stress at 6 months postpartum. The relationship between higher postpartum mood symptoms at 3 months and increased internalizing behaviour at 3 years of age was mediated by increased reports of parenting stress at 6 months (b = .12, 95% CI = .02, .25). This association was not evident at 6 years. Parenting stress in early infancy may provide a treatment target to reduce the impact of perinatal depression on early child behavior.
Collapse
Affiliation(s)
- Dianne Semeniuk
- Department of Psychiatry, University of British Columbia, Vancouver, Canada.
- BC Children's Hospital, P4 Healthy Minds Centre, 4500 Oak St, Vancouver, BC, V6H 3N1, Canada.
| | - Katelynn E Boerner
- Department of Pediatrics, University of British Columbia, Vancouver, Canada
- British Columbia Children's Hospital Research Institute, Vancouver, Canada
| | - Ursula Brain
- Department of Pediatrics, University of British Columbia, Vancouver, Canada
- British Columbia Children's Hospital Research Institute, Vancouver, Canada
| | - Deirdre Ryan
- Department of Psychiatry, University of British Columbia, Vancouver, Canada
- Reproductive Mental Health Program, BC Children's and Women's Hospital, Vancouver, Canada
| | - Tim F Oberlander
- Department of Pediatrics, University of British Columbia, Vancouver, Canada
- British Columbia Children's Hospital Research Institute, Vancouver, Canada
- School of Public and Population Health, University of British Columbia, Vancouver, Canada
| |
Collapse
|
2
|
Hoppe CJM, Schuback N, Semeniuk D, Giesbrecht K, Mol J, Thomas H, Maldonado MT, Rost B, Varela DE, Tortell PD. Correction to: Resistance of Arctic phytoplankton to ocean acidification and enhanced irradiance. Polar Biol 2018. [DOI: 10.1007/s00300-018-2267-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
3
|
Hoppe CJM, Schuback N, Semeniuk D, Giesbrecht K, Mol J, Thomas H, Maldonado MT, Rost B, Varela DE, Tortell PD. Resistance of Arctic phytoplankton to ocean acidification and enhanced irradiance. Polar Biol 2017; 41:399-413. [PMID: 31983801 PMCID: PMC6952045 DOI: 10.1007/s00300-017-2186-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 07/21/2017] [Accepted: 07/23/2017] [Indexed: 11/29/2022]
Abstract
The Arctic Ocean is a region particularly prone to ongoing ocean acidification (OA) and climate-driven changes. The influence of these changes on Arctic phytoplankton assemblages, however, remains poorly understood. In order to understand how OA and enhanced irradiances (e.g., resulting from sea–ice retreat) will alter the species composition, primary production, and eco-physiology of Arctic phytoplankton, we conducted an incubation experiment with an assemblage from Baffin Bay (71°N, 68°W) under different carbonate chemistry and irradiance regimes. Seawater was collected from just below the deep Chl a maximum, and the resident phytoplankton were exposed to 380 and 1000 µatm pCO2 at both 15 and 35% incident irradiance. On-deck incubations, in which temperatures were 6 °C above in situ conditions, were monitored for phytoplankton growth, biomass stoichiometry, net primary production, photo-physiology, and taxonomic composition. During the 8-day experiment, taxonomic diversity decreased and the diatom Chaetoceros socialis became increasingly dominant irrespective of light or CO2 levels. We found no statistically significant effects from either higher CO2 or light on physiological properties of phytoplankton during the experiment. We did, however, observe an initial 2-day stress response in all treatments, and slight photo-physiological responses to higher CO2 and light during the first five days of the incubation. Our results thus indicate high resistance of Arctic phytoplankton to OA and enhanced irradiance levels, challenging the commonly predicted stimulatory effects of enhanced CO2 and light availability for primary production.
Collapse
Affiliation(s)
- C J M Hoppe
- 1Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC Canada.,2Marine Biogeosciences, Alfred Wegener Institute - Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
| | - N Schuback
- 1Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC Canada.,3Department of Physics and Astronomy, Curtin University, Perth, WA Australia
| | - D Semeniuk
- 1Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC Canada
| | - K Giesbrecht
- 4School of Earth and Ocean Sciences, University of Victoria, Victoria, BC Canada
| | - J Mol
- 5Department of Oceanography, Dalhousie University, Halifax, NS Canada
| | - H Thomas
- 5Department of Oceanography, Dalhousie University, Halifax, NS Canada
| | - M T Maldonado
- 1Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC Canada
| | - B Rost
- 2Marine Biogeosciences, Alfred Wegener Institute - Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
| | - D E Varela
- 4School of Earth and Ocean Sciences, University of Victoria, Victoria, BC Canada.,6Department of Biology, University of Victoria, Victoria, BC Canada
| | - P D Tortell
- 1Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC Canada.,7Department of Botany, University of British Columbia, Victoria, BC Canada.,8Peter Wall Institute for Advanced Studies, University of British Columbia, Vancouver, Canada
| |
Collapse
|
5
|
Esther CR, Semeniuk D, Marino EM, Zhou Y, Overbeek PA, Bernstein KE. Expression of testis angiotensin-converting enzyme is mediated by a cyclic AMP responsive element. J Transl Med 1997; 77:483-8. [PMID: 9389791] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Testis angiotensin-converting enzyme (testis ACE), an ACE isozyme that plays an important role in male fertility, is transcribed from a unique promotor active only in developing spermatids. In vitro analysis suggests the importance of a cyclic AMP response element (CRE)-like region within the testis ACE promoter, and similar DNA motifs are important in the expression of a variety of testis-specific genes. In the present study, we examined the effects of mutations in the CRE-like element on testis ACE promoter activity in vivo using transgenic mice. Disruption of this element reduced reporter gene expression to near background levels. In contrast, conversion of the CRE-like element to a consensus CRE-binding site resulted in high level expression of the reporter gene specifically in the testis. These experiments prove that the CRE-like element is essential for testis ACE promoter activity, although it does not appear to be responsible for its tissue specificity. These data provide insight into how a phenotypically differentiated tissue, ie, male gem cells, regulate tissue-specific gene expression.
Collapse
Affiliation(s)
- C R Esther
- Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia 30322, USA
| | | | | | | | | | | |
Collapse
|
6
|
Boismenu R, Semeniuk D, Murgita RA. Purification and characterization of human and mouse recombinant alpha-fetoproteins expressed in Escherichia coli. Protein Expr Purif 1997; 10:10-26. [PMID: 9179285 DOI: 10.1006/prep.1996.0697] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [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: 02/04/2023]
Abstract
Alpha-fetoprotein (AFP) is a tumor-associated embryonic molecule whose precise biological function(s) remains unclear. A more complete analysis of the physiological activities of this oncofetal protein has, until now, been severely limited by the lack of an appropriate source from which to obtain pure AFP in any sizeable quantity. In the present investigation, we obviate this problem by cloning and efficiently overexpressing mature mouse and human AFP cDNA's in Escherichia coli. For recombinant mouse AFP (rMoAFP), large segments of the coding region were excised from the preexisting plasmids pAFP1 and pAFP2, which together encompass 90% of the AFP sequence. The mouse cDNA was made complete by the addition of N- and C-terminal encoding oligonucleotides. Mouse AFP cDNA was expressed directly as a full-length molecule in vector pTrp4 or as fusion proteins in plasmids pMALc and pRX1 under the transcriptional control of trp or tac promoters. Accumulation of rMoAFP was significantly increased in protease-deficient E. coli strains over nonprotease-deficient strains, > or = 10% of total cell protein. Of the gene fusion proteins examined, none offered significant advantage over the direct expression product in terms of recombinant protein stability, overall levels of synthesis, or facilitated purification. Recombinant AFP polypeptides expressed by pTrp4 were as expected, deposited in bacterial inclusion bodies. Subsequent to resolubilization/refolding, rMoAFP was first enriched by passage over Q-Sepharose resin followed by final purification using immobilized copper-chelate affinity chromatography. Protein sequencing of the N-terminus revealed that purified rMoAFP had a deletion of the first nine amino acids coded for by the full-length mouse AFP cDNA. Similar N-terminal deletions are observed with AFP isolates originating from natural sources. A complete human AFP cDNA was generated from a fetal liver cDNA library and was cloned into vector pTrp4. Recombinant human AFP (rHuAFP) was expressed under the identical conditions employed for rMoAFP but purification had to be modified to include preparative Mono Q anion exchange chromatography. N-terminal sequencing, amino acid compositional analysis, and electrospray mass spectrometry revealed that purified rHuAFP was intact and unaltered and that the initiator methionine was completely removed. The biological activity of recombinant AFP, as judged by its inhibitory effects on in vitro lymphocyte proliferation, was equivalent to that of the native protein. The availability of large quantities of mouse and human recombinant AFP molecules should now permit detailed structure-function analyses of this important oncofetal protein to proceed in a manner unimpeded by previous limitations in both quantity and quality of the native proteins.
Collapse
Affiliation(s)
- R Boismenu
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec, Canada
| | | | | |
Collapse
|