Hyaluronan is a prerequisite for ductal branching morphogenesis

Area of Science:

• Developmental Biology
• Extracellular Matrix Biology
• Molecular Endocrinology

Background:

• Hyaluronan (HA), a key extracellular matrix component, is vital during embryogenesis and tissue growth.
• CD44, the primary HA receptor, is a transmembrane glycoprotein with variable expression.
• Prostate development involves complex interactions between growth factors, hormones, and the extracellular matrix.

Purpose of the Study:

• To investigate the expression patterns of hyaluronan and CD44 during mouse anterior prostate development.
• To elucidate the role of hyaluronan-CD44 interactions in androgen-stimulated ductal branching morphogenesis.

Main Methods:

• Analysis of hyaluronan and CD44 expression in mouse anterior prostate at various postnatal ages.
• Reverse transcriptase polymerase chain reaction (RT-PCR) to determine CD44 variant isoform regulation.
• Serum-free organ culture of mouse prostate to study ductal branching morphogenesis in response to testosterone.

Main Results:

• Hyaluronan was localized in the stromal matrix, decreasing with age and absent in quiescent regions.
• CD44 expression shifted from mesenchymal to epithelial cell membranes during prostate development.
• Inhibition of hyaluronan-CD44 interactions (using antibodies, HA fragments, or hyaluronidase) blocked androgen-induced ductal branching.

Conclusions:

• Hyaluronan-CD44 interactions play a significant role in mediating androgen-induced prostatic growth.
• These interactions are essential for ductal branching morphogenesis during prostate development.
• The findings highlight the importance of the extracellular matrix-receptor axis in male reproductive organogenesis.