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Effect of laminin, polylysine and cell medium components on the attachment of human hepatocellular carcinoma cells to cellulose nanofibrils analyzed by surface plasmon resonance. J Colloid Interface Sci 2020; 584:310-319. [PMID: 33069029 DOI: 10.1016/j.jcis.2020.09.080] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 08/22/2020] [Accepted: 09/20/2020] [Indexed: 12/26/2022]
Abstract
The development of in vitro cell models that mimic cell behavior in organs and tissues is an approach that may have remarkable impact on drug testing and tissue engineering applications in the future. Plant-based, chemically unmodified cellulose nanofibrils (CNF) hydrogel is a natural, abundant, and biocompatible material that has attracted great attention for biomedical applications, in particular for three-dimensional cell cultures. However, the mechanisms of cell-CNF interactions and factors that affect these interactions are not yet fully understood. In this work, multi-parametric surface plasmon resonance (SPR) was used to study how the adsorption of human hepatocellular carcinoma (HepG2) cells on CNF films is affected by the different proteins and components of the cell medium. Both human recombinant laminin-521 (LN-521, a natural protein of the extracellular matrix) and poly-l-lysine (PLL) adsorbed on CNF films and enhanced the attachment of HepG2 cells. Cell medium components (glucose and amino acids) and serum proteins (fetal bovine serum, FBS) also adsorbed on both bare CNF and on protein-coated CNF substrates. However, the adsorption of FBS hindered the attachment of HepG2 cells to LN-521- and PLL-coated CNF substrates, suggesting that serum proteins blocked the formation of laminin-integrin bonds and decreased favorable PLL-cell electrostatic interactions. This work sheds light on the effect of different factors on cell attachment to CNF, paving the way for the utilization and optimization of CNF-based materials for different tissue engineering applications.
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Cunha ATM, Silva LP, Carvalho JO, Dode MAN. Shape and size of epididymal sperm from Gir bulls using atomic force microscopy: A nanoscale characterization of epididymal sperm. Reprod Biol 2019; 20:37-41. [PMID: 31899131 DOI: 10.1016/j.repbio.2019.12.007] [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: 09/21/2019] [Revised: 12/17/2019] [Accepted: 12/22/2019] [Indexed: 11/16/2022]
Abstract
As epididymal sperm (EP) are not exposed to seminal plasma, they are physiologically different from ejaculated spermatozoa (EJ). Therefore, the aim of this study was to morphologically characterize the head of EP recovered from the epididymis tail, and to evaluate if the physiological differences between EP and EJ were also expressed in the head's shape and size. EP and EJ were recovered from seven Gir bulls and were individually assessed. Sperm cells were washed, fixed, and 20 cells from each animal were analyzed by atomic force microscopy (AFM). The images were acquired through contact mode. Then, an off-line processing software was used and the images acquired were manually segmented using digital zoom of the original images. Twenty-four structural features were assessed including one, two, and three dimensional parameters, and also shape descriptors which were calculated based on the one and two dimensional parameters. Data were compared by t-test, then, a collective analysis was performed using principal component analysis (PCA). The EP group presented higher roughness and elongation (P ≤ 0.05), and smaller form factor and circularity rate than that of the EJ group (P ≤ 0.05). For the other parameters no differences (P ≥ 0.05) were observed. In addition, in the PCA analysis no differences among EP and EJ were observed either (P ≤ 0.05). This study showed that EP and EJ collected from the same sire presented similar characteristics in nineteen of the twenty-four parameters evaluated, indicating that absence of seminal plasma does not affect the morphology of EP.
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Mortimer D. The functional anatomy of the human spermatozoon: relating ultrastructure and function. Mol Hum Reprod 2019; 24:567-592. [PMID: 30215807 DOI: 10.1093/molehr/gay040] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 09/11/2018] [Indexed: 12/16/2022] Open
Abstract
The Internet, magazine articles, and even biomedical journal articles, are full of cartoons of spermatozoa that bear minimal resemblance to real spermatozoa, especially human spermatozoa, and this had led to many misconceptions about what spermatozoa look like and how they are constituted. This review summarizes the historical and current state of knowledge of mammalian sperm ultrastructure, with particular emphasis on and relevance to human spermatozoa, combining information obtained from a variety of electron microscopic (EM) techniques. Available information on the composition and configuration of the various ultrastructural components of the spermatozoon has been related to their mechanistic purpose and roles in the primary aspects of sperm function and fertilization: motility, hyperactivation, capacitation, the acrosome reaction and sperm-oocyte fusion.
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Affiliation(s)
- David Mortimer
- Oozoa Biomedical Inc., Caulfeild Village, West Vancouver, BC, Canada
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Sunanda P, Panda B, Dash C, Padhy RN, Routray P. An illustration of human sperm morphology and their functional ability among different group of subfertile males. Andrology 2018; 6:680-689. [PMID: 29959832 DOI: 10.1111/andr.12500] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 02/22/2018] [Accepted: 04/08/2018] [Indexed: 11/30/2022]
Abstract
Condensed sperm chromatin is a prerequisite for natural fertilization. Some reports suggested the prevalence of chromatin condensation defects in teratozoospermia cases with head anomalies; conversely, earlier studies exemplified its occurrence in morphologically normal spermatozoa too. The aim of this study was to compare the condensation defects in correlation with head anomalies among different groups of subfertile males and its impact on the rate of fertilization in assisted reproduction procedures. Ultrastructure analysis of spermatozoa through scanning electron microscopy and atomic force microscopy could facilitate an in-depth evaluation of sperm morphology. Nuclear condensation defects (%) in spermatozoa were analyzed in 666 subjects, and its effect on the rate of fertilization was analyzed in 116 IVF and 90 intracytoplasmic sperm injection cases. There was no correlation of condensation defects with head anomalies (%). Student's t-test showed no significant changes in mean values of condensation defects in abnormal semen samples in comparison with the normal group. Condensation defects were observed in normal spermatozoa too, which was negatively associated with the rate of fertilization in IVF (p < 0.01), but intracytoplasmic sperm injection outcome remained unaffected. Ultrastructure study revealed sperm morphological features in height, amplitude, and three-dimensional views in atomic force microscopy images presenting surface topography, roughness property of head, and compact arrangement of mitochondria over axoneme with height profile at nanoscale. In pathological forms, surface roughness and nuclear thickness were marked higher than the normal spermatozoa. Thus, percentage of normal spermatozoa with condensation defects could be a predictive factor for the rate of fertilization in IVF. From diverse shapes of nucleus in AFM imaging, it could be predicted that defective nuclear shaping might be impeding the activity of some proteins/ biological motors, those regulate the proper Golgi spreading over peri-nuclear theca.
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Affiliation(s)
- P Sunanda
- Centre for Human Reproduction, IMS & SUM Hospital, Bhubaneswar, Odisha, India
| | - B Panda
- O & G Department, Centre for Human Reproduction, IMS & SUM Hospital, SOA University, Bhubaneswar, Odisha, India
| | - C Dash
- Centre for Human Reproduction, IMS & SUM Hospital, Bhubaneswar, Odisha, India
| | - R N Padhy
- Central Research Laboratory, IMS& SUM Hospital, Bhubaneswar, Odisha, India
| | - P Routray
- Aquaculture Production and Environment Division, Central Institute of Freshwater Aquaculture, Bhubaneswar, Odisha, India
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Andolfi L, Trevisan E, Troian B, Prato S, Boscolo R, Giolo E, Luppi S, Martinelli M, Ricci G, Zweyer M. The application of scanning near field optical imaging to the study of human sperm morphology. J Nanobiotechnology 2015; 13:2. [PMID: 25591971 PMCID: PMC4302611 DOI: 10.1186/s12951-014-0061-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 12/18/2014] [Indexed: 11/16/2022] Open
Abstract
Background The morphology of spermatozoa is a fundamental aspect to consider in fertilization, sperm pathology, assisted reproduction and contraception. Head, neck, midpiece, principal and terminal part of flagellum are the main sperm components to investigate for identifying morphological features and related anomalies. Recently, scanning near-field optical microscopy (SNOM), which belongs to the wide family of nanoscopic techniques, has opened up new routes for the investigation of biological systems. SNOM is the only technique able to provide simultaneously highly resolved topography and optical images with a resolution beyond the diffraction limit, typical of conventional optical microscopy. This offers the advantage to obtain complementary information about cell surface and cytoplasmatic structures. Results In this work human spermatozoa both healthy and with morphological anomalies are analyzed by SNOM, to demonstrate the potentiality of such approach in the visualization of sperm morphological details. The combination of SNOM topography with optical (reflection and transmission) images enables to examine typical topographic features of spermatozoa together with underlying cytoplasmic structures. Indeed the head shape and inner components as acrosome and nucleus, and the organization of mitochondria in the midpiece region are observed. Analogously for principal tract of the tail, the ridges and the columns are detected in the SNOM topography, while their internal arrangement can be observed in the corresponding SNOM optical transmission images, without requiring specific staining procedures or invasive protocols. Conclusions Such findings demonstrate that SNOM represents a versatile and powerful tool to describe topographical and inner structural details of spermatozoa simultaneously. This analysis could be helpful for better characterizing several morphological anomalies, often related to sperm infertility, which cannot be examined by conventional techniques all together. Electronic supplementary material The online version of this article (doi:10.1186/s12951-014-0061-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Laura Andolfi
- IOM-CNR, Area Science Park, Basovizza, Trieste, Italy.
| | - Elisa Trevisan
- Department of Life Sciences University of Trieste, Trieste, Italy.
| | - Barbara Troian
- A.P.E. Research Srl, AREA Science Park, Basovizza, Trieste, Italy.
| | - Stefano Prato
- A.P.E. Research Srl, AREA Science Park, Basovizza, Trieste, Italy.
| | - Rita Boscolo
- Institute for Maternal and Child Health, IRCCS Burlo Garofolo, Trieste, Italy.
| | - Elena Giolo
- Institute for Maternal and Child Health, IRCCS Burlo Garofolo, Trieste, Italy.
| | - Stefania Luppi
- Institute for Maternal and Child Health, IRCCS Burlo Garofolo, Trieste, Italy.
| | - Monica Martinelli
- Institute for Maternal and Child Health, IRCCS Burlo Garofolo, Trieste, Italy.
| | - Giuseppe Ricci
- Institute for Maternal and Child Health, IRCCS Burlo Garofolo, Trieste, Italy. .,Department of Medicine, Surgery and Health Sciences, University of Trieste, Trieste, Italy.
| | - Marina Zweyer
- Department of Medicine, Surgery and Health Sciences, University of Trieste, Trieste, Italy.
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Nanoscale differences in the shape and size of X and Y chromosome-bearing bovine sperm heads assessed by atomic force microscopy. PLoS One 2013; 8:e59387. [PMID: 23527178 PMCID: PMC3602057 DOI: 10.1371/journal.pone.0059387] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Accepted: 02/14/2013] [Indexed: 01/08/2023] Open
Abstract
Sperm dimensions and the question of whether X and Y chromosome-bearing sperm differ in size or shape has been of great interest, especially for the development of alternative methods to sort or classify sperm cells. The aim of the present study was to evaluate possible differences in the shape and size of the sperm head between X and Y chromosome-bearing sperm by atomic force microscopy (AFM). One ejaculate per bull (n = 4) was used. Each ejaculate was separated into four fractions: non-sexed (NS), sexed for X-sperm (SX), sexed for Y-sperm (SY) and a pooling of SX and SY samples (SXY). Using AFM, 400 sperm heads per group were measured. Twenty three structural features were assessed including one-, two- and three-dimensional parameters and shape descriptors. These measurements determine the micro- to nanoscale features of X- and Y-bearing chromosomes in sperm cells. No differences were observed for any individual variables between SX and SY groups. Next, a simultaneous evaluation of all features using statistical discriminant analysis was performed to determine if it was possible to distinguish to which group belong each individual cells. This analysis clearly showed, a distinct separation of NS, SXY, SX and SY groups. The recognition of this structural possibility to distinguish between X and Y sperm cell might improve the understanding of sperm cells biology. These results indicated that the associations of several structural measurements of the sperm cell head are promising candidates for development of a new method of sperm sexing.
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Crha I, Zakova J, Huser M, Ventruba P, Lousova E, Pohanka M. Digital holographic microscopy in human sperm imaging. J Assist Reprod Genet 2011; 28:725-9. [PMID: 21667103 DOI: 10.1007/s10815-011-9584-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2011] [Accepted: 05/13/2011] [Indexed: 10/18/2022] Open
Abstract
PURPOSE The aim of this study was to use digital holographic microscopy (DHM) in human sperm imaging and compare quantitative phase contrast of sperm heads in normozoospermia (NZ) and oligoasthenozoospermia (OAT). METHODS DHM spermatozoa imaging and repeated quantitative phase shift evaluation were used. Five NZ and 5 OAT samples were examined. Semen samples were examined by semen analysis and processed for DHM. Main outcome measures were maximum phase shift value of the sperm heads. Differences of the phase shift and in NZ and OAT samples were statistically tested. RESULTS In NZ samples median phase shifts were in the range 2.72-3.21 rad and 2.00-2.15 in OAT samples. Differences among individual samples were statistically significant (p < 0.001) in both groups. Median phase shift according to sperm count was 2.90 rad in NZ samples and 2.00 rad in OAT samples. This difference was statistically significant (p < 0.001). CONCLUSION Quantitative evaluation of the phase shift by DHM could provide new information on the exact structure and composition of the sperm head. At present, this technique is not established for clinical utility.
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Affiliation(s)
- Igor Crha
- Department of Gynecology and Obstetrics, Faculty of Medicine, Masaryk University, and Faculty Hospital, Brno, Czech Republic.
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