Positive rheotaxis extended drop: a one-step procedure to select and recover sperm with mature chromatin for intracytoplasmic sperm injection
| Autor: | Paulo C. Serafini, Bruno Camargo Tiseo, Hamilton de Martin, Guilherme J. A. Wood, Pedro A A Monteleone, Edmund Chada Baracat, Marcello Cocuzza, Miguel Srougi, José Maria Soares, Eduardo P. Miranda |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Adult Male medicine.medical_treatment TÉCNICAS DE REPRODUÇÃO Pilot Projects Biology Intracytoplasmic sperm injection Andrology 03 medical and health sciences Young Adult 0302 clinical medicine Rheotaxis Genetics medicine Centrifugation Density Gradient Humans Prospective Studies Sperm Injections Intracytoplasmic reproductive and urinary physiology Genetics (clinical) Sperm motility Dna integrity Technological Innovations 030219 obstetrics & reproductive medicine urogenital system Obstetrics and Gynecology Motile sperm General Medicine Middle Aged Sperm Spermatozoa Chromatin 030104 developmental biology Reproductive Medicine Hydrodynamics Sperm Motility Rheology Developmental Biology |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | The purpose of this study was to develop a novel one-step ICSI approach to select sperm with better chromatin maturity than the conventional method.This was a pilot diagnostic study, which prospectively recruited men during a 6-month period in a University-affiliated infertility centre. Forty consecutive semen samples were provided for analysis. The positive rheotaxis extended drop (PRED) was set up creating a pressure and viscosity gradient. Each semen sample was divided into four aliquots: one aliquot for density gradient centrifugation (DGC), two aliquots for PRED (fresh semen (PRED-FS) and processed semen (PRED-DGC)), and one aliquot as the control (FS). In PRED, a mean of 200 spermatozoa were collected consecutively without selection from the outlet reservoir. The aniline blue assay was used to assess chromatin immaturity.The mean channel length, measured from inlet to outlet, was 32.55 ± 0.86 mm, with a mean width of 1.04 ± 0.21 mm. In 82.5% of cases (33/40), at least 50 spermatozoa were captured between 15 and 30 min. Improved chromatin maturity after the DGC preparation and the PRED approach was observed in all samples. This was reflected by a mean reduction from 28.65 ± 8.97% uncondensed chromatin in the native ejaculates to 17.29 ± 7.72% in DGC and 0.89 ± 1.31% in the PRED approach (P 0.01).The PRED method may improve the current ICSI technique by providing it with its own sperm selection process. ICSI would probably become an even more complete technique comprising selection, capture and injection of the male gamete. |
| Databáze: | OpenAIRE |
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