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Related Concept Videos

Phosphoinositides and PIPs01:42

Phosphoinositides and PIPs

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Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
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IP3/DAG Signaling Pathway01:11

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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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Spermatogenesis01:41

Spermatogenesis

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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...
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Spermatogenesis01:22

Spermatogenesis

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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.
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Fertilization01:38

Fertilization

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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
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Feedback Regulation of Calcium Concentration01:27

Feedback Regulation of Calcium Concentration

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Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
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Phosphopeptide Analysis of Rodent Epididymal Spermatozoa
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Phosphoinositide signaling in sperm development.

Julie A Brill1, Sukriye Yildirim2, Lacramioara Fabian2

  • 1Cell Biology Program, The Hospital for Sick Children, Toronto, ON M5G OA4, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON M5S 1A8, Canada; Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada.

Seminars in Cell & Developmental Biology
|June 21, 2016
PubMed
Summary

Phosphatidylinositol phosphates (PIPs) are vital membrane lipids essential for sperm development. These molecules regulate key processes from germline stem cell maintenance to the formation of mature, motile sperm.

Keywords:
FliesMale germ cellMicePhosphatidylinositol phosphateSpermatogenesisSpermiogenesis

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Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry
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Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry

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Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry
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Using an Extracellular Flux Analyzer to Measure Changes in Glycolysis and Oxidative Phosphorylation during Mouse Sperm Capacitation
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Area of Science:

  • Cell Biology
  • Reproductive Biology
  • Lipid Metabolism

Background:

  • Phosphatidylinositol phosphates (PIPs) are critical membrane lipids involved in diverse cellular processes like morphogenesis, cytoskeletal organization, and signaling.
  • Recent research highlights the essential roles of PIPs and their associated enzymes in various stages of sperm development across multiple species.

Purpose of the Study:

  • To review the stages of spermatogenesis.
  • To discuss the specific roles of PIPs and their regulatory enzymes in male germ cell development.

Main Methods:

  • Literature review of recent studies on PIPs in spermatogenesis.
  • Analysis of the functions of PIPs and their regulatory enzymes in male germ cells.

Main Results:

  • PIPs are crucial for germline stem cell maintenance, proliferation, and survival.
  • These lipids regulate spermatocyte cytokinesis, spermatid polarization, sperm tail formation, and nuclear shaping.
  • Proper PIP levels are essential for the production of mature, motile sperm.

Conclusions:

  • PIPs and their regulatory enzymes play indispensable roles throughout spermatogenesis.
  • Understanding PIP functions provides insights into male fertility and potential therapeutic targets.