The Src non-receptor tyrosine kinase paradigm: New insights into mammalian Sertoli cell biology

Katarzyna Chojnacka1, Dolores D Mruk1

  • 1Center for Biomedical Research, Population Council, New York, USA.

Insights

The Src kinase (c-Src) plays a crucial role in mammalian spermatogenesis. This review highlights c-Src

Area of Science:

  • Cell Biology
  • Reproductive Biology
  • Biochemistry

Background:

  • Src kinases are non-receptor tyrosine kinases regulating critical cellular processes.
  • c-Src, a key member, is expressed in the mammalian testis.
  • Testicular c-Src is involved in spermatid release and blood-testis barrier dynamics.

Purpose of the Study:

  • To review the recent findings on c-Src.
  • To emphasize the role of c-Src in spermatogenesis.
  • To discuss c-Src's function in mammalian testis.

Main Methods:

  • Literature review of studies on c-Src.
  • Analysis of c-Src expression patterns in the testis.
  • Investigation of c-Src's role in cell adhesion and junction disassembly.

Main Results:

  • c-Src levels peak during mature spermatid release in rat testis.
  • Testosterone regulates spermatid adhesion via c-Src, impacting Sertoli cell junctions.
  • c-Src is implicated in the internalization of blood-testis barrier proteins.

Conclusions:

  • c-Src is vital for spermatogenesis, particularly in spermiation.
  • Mechanisms of junction disassembly by c-Src are relevant to both spermatid release and barrier function.
  • Further research on c-Src in the mammalian testis is warranted.

Related Concept Videos

Receptor Tyrosine Kinases01:26

Receptor Tyrosine Kinases

Receptor tyrosine kinases or RTKs are membrane-bound receptors that phosphorylate specific tyrosine on protein substrates. RTKs regulate cellular growth, differentiation, survival, and migration. They contain an extracellular ligand binding domain, a transmembrane domain, and a cytosolic tail with intrinsic kinase activity. Several extracellular signaling molecules activate RTKs in one or more ways and relay the signal downstream. Ligands such as platelet-derived growth factor (PDGF) or...
20.9K
Spermatogenesis01:41

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
124.8K
Spermatogenesis01:22

Spermatogenesis

Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...
11.0K
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
5.1K
Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR...
3.0K
PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a...
6.4K