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Young AE, Kemp JF, Uhlson C, Westcott JL, Ali SA, Saleem S, Garcès A, Figueroa L, Somannavar MS, Goudar SS, Hambidge KM, Hendricks AE, Krebs NF. Improved first trimester maternal iodine status with preconception supplementation: The Women First Trial. Matern Child Nutr 2021; 17:e13204. [PMID: 34036728 PMCID: PMC8476419 DOI: 10.1111/mcn.13204] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 03/31/2021] [Accepted: 04/28/2021] [Indexed: 11/25/2022]
Abstract
Maternal iodine (I) status is critical in embryonic and foetal development. We examined the effect of preconception iodine supplementation on maternal iodine status and on birth outcomes. Non‐pregnant women in Guatemala, India and Pakistan (n ~ 100 per arm per site) were randomized ≥ 3 months prior to conception to one of three intervention arms: a multimicronutrient‐fortified lipid‐based nutrient supplement containing 250‐μg I per day started immediately after randomization (Arm 1), the same supplement started at ~12 weeks gestation (Arm 2) and no intervention supplement (Arm 3). Urinary I (μg/L) to creatinine (mg/dl) ratios (I/Cr) were determined at 12 weeks for Arm 1 versus Arm 2 (before supplement started) and 34 weeks for all arms. Generalized linear models were used to assess the relationship of I/Cr with arm and with newborn anthropometry. At 12 weeks gestation, adjusted mean I/Cr (μg/g) for all sites combined was significantly higher for Arm 1 versus Arm 2: (203 [95% CI: 189, 217] vs. 163 [95% CI: 152, 175], p < 0.0001). Overall adjusted prevalence of I/Cr < 150 μg/g was also lower in Arm 1 versus Arm 2: 32% (95% CI: 26%, 38%) versus 43% (95% CI: 37%, 49%) (p = 0.0052). At 34 weeks, adjusted mean I/Cr for Arm 1 (235, 95% CI: 220, 252) and Arm 2 (254, 95% CI: 238, 272) did not differ significantly but were significantly higher than Arm 3 (200, 95% CI: 184, 218) (p < 0.0001). Nominally significant positive associations were observed between I/Cr at 12 weeks and birth length and head circumference z‐scores (p = 0.028 and p = 0.005, respectively). These findings support the importance of first trimester iodine status and suggest need for preconception supplementation beyond salt iodization alone.
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Affiliation(s)
- Amy E Young
- Department of Pediatrics, Section of Nutrition, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Jennifer F Kemp
- Department of Pediatrics, Section of Nutrition, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Charis Uhlson
- Department of Pediatrics, Section of Nutrition, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Jamie L Westcott
- Department of Pediatrics, Section of Nutrition, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Sumera A Ali
- Department of Community Health Sciences, Aga Khan University, Karachi, Pakistan
| | - Sarah Saleem
- Department of Community Health Sciences, Aga Khan University, Karachi, Pakistan
| | - Ana Garcès
- Maternal Infant Health Center, Instituto de Nutrición de Centro América y Panamá (INCAP), Guatemala City, Guatemala
| | - Lester Figueroa
- Maternal Infant Health Center, Instituto de Nutrición de Centro América y Panamá (INCAP), Guatemala City, Guatemala
| | - Manjunath S Somannavar
- Women's and Children's Health Research Unit, KLE Academy of Higher Education & Research's JN Medical College, Belagavi, India
| | - Shivaprasad S Goudar
- Women's and Children's Health Research Unit, KLE Academy of Higher Education & Research's JN Medical College, Belagavi, India
| | - K Michael Hambidge
- Department of Pediatrics, Section of Nutrition, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Audrey E Hendricks
- Department of Mathematical & Statistical Sciences, University of Colorado Denver, Denver, Colorado, USA
| | - Nancy F Krebs
- Department of Pediatrics, Section of Nutrition, University of Colorado School of Medicine, Aurora, Colorado, USA
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Garcès A, Livet J, Grillet N, Henderson CE, Delapeyrière O. Responsiveness to neurturin of subpopulations of embryonic rat spinal motoneuron does not correlate with expression of GFR alpha 1 or GFR alpha 2. Dev Dyn 2001; 220:189-97. [PMID: 11241828 DOI: 10.1002/1097-0177(20010301)220:3<189::aid-dvdy1106>3.0.co;2-i] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [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: 12/19/2022] Open
Abstract
Glial cell-line derived neurotrophic factor (GDNF) and its relative neurturin (NTN) are both potent trophic factors for motoneurons. They exert their biological effects by activating the RET tyrosine kinase in the presence of a GPI-linked coreceptor, either GFR alpha 1 (considered to be the favored coreceptor for GDNF) or GFR alpha 2 (the preferred NTN coreceptor). By whole-mount in situ hybridization on embryonic rat spinal cord, we demonstrate that, whereas Ret is expressed by nearly all motoneurons, Gfra1 and Gfra2 exhibit complementary and sometimes overlapping patterns of expression. In the brachial and sacral regions, the majority of motoneurons express Gfra1 but only a minority express Gfra2. Accordingly, most motoneurons purified from each region are kept alive in culture by GDNF. However, brachial motoneurons respond poorly to NTN, whereas NTN maintains as many sacral motoneurons as does GDNF. Thus, spinal motoneurons are highly heterogeneous in their expression of receptors for neurotrophic factors of the GDNF family, but their differing responses to NTN are not correlated with expression levels of Gfra1 or Gfra2.
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Affiliation(s)
- A Garcès
- INSERM U.382, Developmental Biology Institute of Marseille, CNRS-INSERM-Université de la Méditerranée, AP de Marseille, Campus de Luminy, Case 907, 13288 Marseille Cedex 09, France
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Garcès A, Haase G, Airaksinen MS, Livet J, Filippi P, deLapeyrière O. GFRalpha 1 is required for development of distinct subpopulations of motoneuron. J Neurosci 2000; 20:4992-5000. [PMID: 10864957 PMCID: PMC6772293] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023] Open
Abstract
Glial cell-line derived neurotrophic factor (GDNF) and its relative neurturin (NTN) are potent trophic factors for motoneurons. They exert their biological effects by activating the RET tyrosine kinase in the presence of a glycosyl-phosphatidylinositol-linked co-receptor, either GFRalpha1 or GFRalpha2. By whole-mount in situ hybridization on embryonic mouse spinal cord, we demonstrate that whereas Ret is expressed by nearly all motoneurons, Gfra1 and Gfra2 exhibit complex and distinct patterns of expression. Most motoneurons purified from Gfra1 null mutant mice had lost their responsiveness to both GDNF and NTN. However, a minority of them ( approximately 25%) retained their ability to respond to both factors, perhaps because they express GFRalpha2. Surprisingly, Gfra2(-/-) motoneurons showed normal survival responses to both GDNF and NTN. Thus, GFRalpha1, but not GFRalpha2, is absolutely required for the survival response of a majority of motoneurons to both GDNF and NTN. In accordance with the phenotype of the mutant motoneurons observed in culture we found the loss of distinct groups of motoneurons, identified by several markers, in the Gfra1(-/-) spinal cords but no gross defects in the Gfra2(-/-) mutant. During their natural programmed cell death period, motoneurons in the Gfra1(-/-) mutant mice undertook increased apoptosis. Taken together these findings support the existence of subpopulations of motoneuron with different trophic requirements, some of them being dependent on the GDNF family.
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Affiliation(s)
- A Garcès
- Institut National de la Santé et de la Recherche Médicale (INSERM) U.382, France
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Abstract
In the nervous system, fibroblast growth factor-9 (FGF9) is produced mainly by neurons. By whole-mount in situ hybridization, on embryonic rat spinal cord, we observed Fgf9 expression in a subpopulation of motoneurons located in the thoracic and sacral regions of the median motor column that innervate the axial muscles. Furthermore, FGF9 prevented death of purified rat and chicken motoneurons in culture in the same concentration range as FGF2. The targets of FGF9 are more restricted than that of the other FGFs, however, because conversely to FGF1 or FGF2, FGF9 had only weak or inexistent survival effects on chicken ciliary neurons or rat DRG. FGF9 may therefore play a role as an autocrine/paracrine survival factor for motoneurons.
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Affiliation(s)
- A Garcès
- INSERM U.382, Institut de Biologie du Développement de Marseille (INSERM-CNRS-Univ. Méditerraneé-AP Marseille), Campus de Luminy, Marseille, France
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