In the form of artificially generated testicles, scientists have really grown a pair.
Scientists at Bar-Ilan University in Israel have created “laboratory testicles” that may be able to address problems with male infertility.
The testis is responsible for sperm production and testosterone synthesis, so abnormalities in their development and function lead to disorders of sex development (DSD) and male infertility.
The breakthrough in the development of artificial testicles is also expected to help in the eventual production of sperm, the team said.
Dr Nitzan Gonen and her team succeeded in creating ‘laboratory testicles’ that may significantly advance understanding of the mechanisms involved in sex determination and provide solutions for male infertility – which affects one in 12 men worldwide.
She said: ‘Artificial testicles are a promising model for basic research on testicle development and function, which can be translated into therapeutic applications for disorders of sexual development and infertility.’
In the future Dr Gonen plans to produce organoids using human samples.
A testis produced from human cells, for example, could help children being treated for cancer, which may impair their ability to produce functional sperm. As children are too young to produce their own sperm, these samples can be frozen and used in the future to have children.
Dr Gonen’s vision is to grow testes organoids from biopsies of children with cancer and hopefully grow fertile sperm in vitro.
The artificial testicles produced in Dr Gonen’s lab at the Goodman Faculty of Life Sciences and the Institute of Nanotechnology and Advanced Materials at Bar-Ilan University, are known as testis organoids – tiny, artificial organs produced from real mouse testis.
Development of organoids has greatly advanced in the last decade when researchers realised that two-dimensional cellular sample in vitro cannot mimic the behaviour of an entire organ.
Today, organoids of the brain, kidneys, intestines, and other organs have already been produced. The testicular organoids created by Dr Gonen’s group closely simulate a natural testicle.
The artificial testicles were cultured from immature testicular cells sampled from neonatal mice. The research team realised the procedure was a success when they identified tubule-like structures and cellular organisation highly resembling that of the in vivo testis.
What other organs have been lab-grown?
Fallopian tubes: using stem cells, scientists from Max Planck Institute for Infection Biology in Berlin grew the innermost cellular layer of human fallopian tubes
Vagina: In 2014, scientists grew vaginas from patients own cells and implanted it in the patient’s body
Mini Kidney: Australian scientists grew a mini kidney, using stem cells to form an organ with the three distinct types of kidney cells for the first time
Mini stomach: Researchers at Zayed Centre for Research into Rare Disease in Children, isolated stem cells from a patient’s stomach and grew them in the lab to obtain mini-stomachs in a dish.
These tubular structures parallel the multiple seminiferous tubules present in the natural testicle, where the sperm is produced.
The organoids were successfully cultured in vitro for nine weeks. This is considered a long period of time and can, theoretically, be enough time to complete the process of sperm production and hormone secretion.
In mice this takes 34 days, so the relatively long lifespan of the organoids may allow these processes to occur in vitro.
Dr Gonen doesn’t yet know if the existing model will actually produce sperm cells, but the laboratory team has already noticed signs of the beginning of meiosis – a process in which gametes are produced.
Gametes are reproductive cells, in this case sperm cells with half the number of chromosomes as in a normal cell, that ‘await’ for the completion of the other half from another gamete, in this case an egg, upon fertilisation.
Organoids usually resemble organs in the embryonic stage. In this case the researchers created conditions that allowed the organoid to mature in the laboratory and showed that even testicles grown from embryonic cells can develop and grow clear sperm tubes.
The team was unsuccessful in its attempt to grow organoids from adult mice testis.
