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Manna S, Biswas P, Haldar R, Naskar TK, Law S. Cord and peripheral blood erythrocyte analysis by scanning electron microscopy and flow cytometry. Int J Lab Hematol 2022; 44:679-687. [PMID: 35150189 DOI: 10.1111/ijlh.13810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 01/27/2022] [Accepted: 02/03/2022] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Human umbilical cord blood is rich in hematopoietic cells. We aimed to focus on the morphological, biochemical, membrane protein profile and surface protein expression differences of erythrocytes, isolated from cord and adult peripheral blood using techniques such as high-resolution scanning electron microscopy (SEM), gel electrophoresis (SDS-PAGE) and flow cytometry. METHODS Adult peripheral blood was collected from consenting adults, and umbilical cord blood was procured from consenting mothers, post-delivery at Medical College, Kolkata. We emphasized on cord and adult peripheral blood erythrocytes' morphological variations using SEM images and protein expression by flow cytometric analysis. Some conventional biochemical analyses such as osmotic fragility of the cell membrane, haemoglobin co-oxidation study and lipid peroxidation assay were done for supporting evidence along with membrane protein content using gel electrophoresis. RESULTS Our SEM images indicated clear morphological variations in cord erythrocyte with a higher degree of cellular deformities and difference in membrane texture. Flow cytometric analysis of cord erythrocyte showed a significant difference in CD235a expression than adults. We observed an overexpression of GLUT1 and decreased expression of Band 3 in cord erythrocyte membrane. Our results also showed cord erythrocytes have low osmotic fragility, a slower rate of co-oxidation of cord haemoglobin and a lesser lipid peroxidation level than that of adults. CONCLUSION Cord blood erythrocytes have deeper indentations leading to higher flexibility, more oxygen-carrying capacity and less osmotic fragility in comparison with adult erythrocytes. The expression of CD235a and Band 4.5 (GLUT 1) was significantly higher in cord erythrocytes than peripheral adult erythrocytes.
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Affiliation(s)
- Sayak Manna
- Stem Cell Research and Application Unit, Department of Biochemistry and Medical Biotechnology, Calcutta School of Tropical Medicine, Kolkata, India
| | - Payel Biswas
- Biophysics and Electrophysiology Unit, Department of Physiology, University of Calcutta, Kolkata, India
| | - Rajen Haldar
- Biophysics and Electrophysiology Unit, Department of Physiology, University of Calcutta, Kolkata, India
| | - Tapan Kumar Naskar
- Department of Obstetrics and Gynaecology, Medical College Kolkata, Kolkata, India
| | - Sujata Law
- Stem Cell Research and Application Unit, Department of Biochemistry and Medical Biotechnology, Calcutta School of Tropical Medicine, Kolkata, India
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Kuzmenko GN, Kharlamova NV, Nazarov SB, Matveeva EA, Ivanenkova YA. Features of modern clinical research blood analysis in the assessment of erythropoiesis in deep-premature newborns. Klin Lab Diagn 2021; 66:26-34. [PMID: 33567170 DOI: 10.18821/0869-2084-2021-66-1-26-34] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
One of the urgent problems of nursing premature babies is the timely prediction, diagnosis and treatment of anemia, the frequency of which reaches 90%. Of particular importance is the study of reticulocytic blood parameters in deep-premature newborns, since the correct assessment of hemograms is crucial in the management of this category of children. To determine the characteristics of red blood cells and reticulocyte parameters of venous blood hemogram in premature newborns 24-32 weeks of gestation in the dynamics of the neonatal period. 111 newborns were examined at 24-32 weeks of gestation in the early neonatal period (on day 3-7) and at the age of 1 month of life. Along with standard diagnostic procedures, in accordance with current clinical recommendations and standards, 28 parameters of erythrocyte and reticulocyte hemogram parameters were determined for children. Venous blood was examined using an automatic hematological analyzer ADVIA 2120i, Siemens, USA. In deep-premature newborns in the early neonatal period, there is a high activity of erythropoiesis, respectively, the severity of respiratory and metabolic disorders with rejuvenation of reticulocytic subpopulations. Negative values of Delta hemoglobin were found against the background of a decrease in the average amount of hemoglobin in reticulocytes in children 24-27 weeks of gestation, which characterizes the lowest values of iron availability for erythropoiesis in this category of newborns. It is shown that a decrease in reticulocyte counts and normochromia in all examined newborns by the age of one month are accompanied by high levels of immature reticulocyte fraction, while a third of children still have limited iron availability for erythropoiesis.
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Affiliation(s)
- Galina Nikolaevna Kuzmenko
- Federal state budgetary institution «Ivanovo research Institute of maternity and childhood named after V.N. Gorodkov» of the Ministry of Health of the Russian Federation
| | - N V Kharlamova
- Federal state budgetary institution «Ivanovo research Institute of maternity and childhood named after V.N. Gorodkov» of the Ministry of Health of the Russian Federation
| | - S B Nazarov
- Federal state budgetary institution «Ivanovo research Institute of maternity and childhood named after V.N. Gorodkov» of the Ministry of Health of the Russian Federation
| | - E A Matveeva
- Federal state budgetary institution «Ivanovo research Institute of maternity and childhood named after V.N. Gorodkov» of the Ministry of Health of the Russian Federation
| | - Yu A Ivanenkova
- Federal state budgetary institution «Ivanovo research Institute of maternity and childhood named after V.N. Gorodkov» of the Ministry of Health of the Russian Federation
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Fernando F, Keijser R, Henneman P, van der Kevie-Kersemaekers AMF, Mannens MM, van der Post JA, Afink GB, Ris-Stalpers C. The idiopathic preterm delivery methylation profile in umbilical cord blood DNA. BMC Genomics 2015; 16:736. [PMID: 26419829 PMCID: PMC4588235 DOI: 10.1186/s12864-015-1915-4] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 09/09/2015] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND Preterm delivery is the leading cause of neonatal morbidity and mortality. Two-thirds of preterm deliveries are idiopathic. The initiating molecular mechanisms behind spontaneous preterm delivery are unclear. Umbilical cord blood DNA samples are an easy source of material to study the neonatal state at birth. DNA methylation changes can be exploited as markers to identify spontaneous preterm delivery. To identify methylation differences specific to idiopathic preterm delivery, we assessed genome-wide DNA methylation changes in 24 umbilical cord blood samples (UCB) using the 450 K Illumina methylation array. After quality control, conclusions were based on 11 term and 11 idiopathic preterm born neonates. The differentially methylated positions (DMPs) specific for preterm/term delivery, neonatal sex, use of oxytocin and mode of initiation of labor were calculated by controlling the FDR p value at 0.05. RESULTS The analysis identifies 1855 statistically significant DMPs between preterm and term deliveries of which 508 DMPs are also attributable to clinical variables other than preterm versus term delivery. 1347 DMPs are unique to term vs preterm delivery, of which 196 DMPs do not relate to gestational age as such. Pathway analysis indicated enrichment of genes involved in calcium signalling, myometrial contraction and relaxation pathways. The 1151 DMPs that correlate with advancing gestational age (p < 0.05) include 161 DMPs that match with two previously reported studies on UCB methylation. Additionally, 123 neonatal sex specific DMPs, 97 DMPs specific to the induction of labour and 42 DMPs specific to the mode of initiation of labor were also identified. CONCLUSION This study identifies 196 DMPs in UCB DNA of neonates which do not relate to gestational age or any other clinical variable recorded and are specific to idiopathic preterm delivery. Furthermore, 161 DMPs from our study overlap with previously reported studies of which a subset is also reported to be differentially methylated at 18 years of age. A DMP on MYL4, encoding myosin light chain 4, is a robust candidate for the identification of idiopathic preterm labour as it is identified by all 3 independent studies.
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Affiliation(s)
- Febilla Fernando
- Reproductive Biology Laboratory, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands.
| | - Remco Keijser
- Reproductive Biology Laboratory, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands.
| | - Peter Henneman
- Department of Clinical Genetics, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands.
| | | | - Marcel Mam Mannens
- Department of Clinical Genetics, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands.
| | - Joris Am van der Post
- Women's and Children's Clinic, Department of Obstetrics and Gynaecology, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands.
| | - Gijs B Afink
- Reproductive Biology Laboratory, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands.
| | - Carrie Ris-Stalpers
- Reproductive Biology Laboratory, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands. .,Women's and Children's Clinic, Department of Obstetrics and Gynaecology, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands.
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Cruickshank MN, Oshlack A, Theda C, Davis PG, Martino D, Sheehan P, Dai Y, Saffery R, Doyle LW, Craig JM. Analysis of epigenetic changes in survivors of preterm birth reveals the effect of gestational age and evidence for a long term legacy. Genome Med 2013; 5:96. [PMID: 24134860 PMCID: PMC3978871 DOI: 10.1186/gm500] [Citation(s) in RCA: 94] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Accepted: 09/26/2013] [Indexed: 02/08/2023] Open
Abstract
Background Preterm birth confers a high risk of adverse long term health outcomes for survivors, yet the underlying molecular mechanisms are unclear. We hypothesized that effects of preterm birth can be mediated through measurable epigenomic changes throughout development. We therefore used a longitudinal birth cohort to measure the epigenetic mark of DNA methylation at birth and 18 years comparing survivors of extremely preterm birth with infants born at term. Methods Using 12 extreme preterm birth cases and 12 matched, term controls, we extracted DNA from archived neonatal blood spots and blood collected in a similar way at 18 years of age. DNA methylation was measured at 347,789 autosomal locations throughout the genome using Infinium HM450 arrays. Representative methylation differences were confirmed by Sequenom MassArray EpiTYPER. Results At birth we found 1,555 sites with significant differences in methylation between term and preterm babies. At 18 years of age, these differences had largely resolved, suggesting that DNA methylation differences at birth are mainly driven by factors relating to gestational age, such as cell composition and/or maturity. Using matched longitudinal samples, we found evidence for an epigenetic legacy associated with preterm birth, identifying persistent methylation differences at ten genomic loci. Longitudinal comparisons of DNA methylation at birth and 18 years uncovered a significant overlap between sites that were differentially-methylated at birth and those that changed with age. However, we note that overlapping sites may either differ in the same (300/1,555) or opposite (431/1,555) direction during gestation and aging respectively. Conclusions We present evidence for widespread methylation differences between extreme preterm and term infants at birth that are largely resolved by 18 years of age. These results are consistent with methylation changes associated with blood cell development, cellular composition, immune induction and age at these time points. Finally, we identified ten probes significantly associated with preterm individuals and with greater than 5% methylation discordance at birth and 18 years that may reflect a long term epigenetic legacy of preterm birth.
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Affiliation(s)
- Mark N Cruickshank
- Early Life Epigenetics Group, Murdoch Childrens Research Institute (MCRI), Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia ; Department of Paediatrics, University of Melbourne, Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia ; Present address: Telethon Institute for Child Health Research, University of Western Australia, 100 Roberts Road, Subiaco, WA 6008, Australia
| | - Alicia Oshlack
- Department of Paediatrics, University of Melbourne, Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia ; Bioinformatics Group, MCRI, Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia
| | - Christiane Theda
- Early Life Epigenetics Group, Murdoch Childrens Research Institute (MCRI), Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia ; Neonatal Services, Royal Women's Hospital, Parkville, Victoria 3052, Australia ; Department of Obstetrics and Gynaecology, University of Melbourne, Royal Women's Hospital, Parkville, Victoria 3052, Australia
| | - Peter G Davis
- Department of Paediatrics, University of Melbourne, Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia ; Neonatal Services, Royal Women's Hospital, Parkville, Victoria 3052, Australia ; Department of Obstetrics and Gynaecology, University of Melbourne, Royal Women's Hospital, Parkville, Victoria 3052, Australia
| | - David Martino
- Cancer and Developmental Epigenetics Group, MCRI, Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia
| | - Penelope Sheehan
- Department of Obstetrics and Gynaecology, University of Melbourne, Royal Women's Hospital, Parkville, Victoria 3052, Australia
| | - Yun Dai
- Early Life Epigenetics Group, Murdoch Childrens Research Institute (MCRI), Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia
| | - Richard Saffery
- Department of Paediatrics, University of Melbourne, Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia ; Cancer and Developmental Epigenetics Group, MCRI, Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia
| | - Lex W Doyle
- Department of Paediatrics, University of Melbourne, Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia ; Neonatal Services, Royal Women's Hospital, Parkville, Victoria 3052, Australia ; Department of Obstetrics and Gynaecology, University of Melbourne, Royal Women's Hospital, Parkville, Victoria 3052, Australia
| | - Jeffrey M Craig
- Early Life Epigenetics Group, Murdoch Childrens Research Institute (MCRI), Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia ; Department of Paediatrics, University of Melbourne, Royal Children's Hospital, Flemington Road, Parkville, Victoria 3052, Australia
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