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The Role of Tight Junctions in Mammary Gland Function

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Journal of Mammary Gland Biology and Neoplasia Aims and scope Submit manuscript

Abstract

Tight junctions (TJ) are cellular structures that facilitate cell-cell communication and are important in maintaining the three-dimensional structure of epithelia. It is only during the last two decades that the molecular make-up of TJ is becoming unravelled, with two major transmembrane-spanning structural protein families, called occludin and claudins, being the true constituents of the TJ. These TJ proteins are linked via specific scaffolding proteins to the cell’s cytoskeleton. In the mammary gland TJ between adjacent secretory epithelial cells are formed during lactogenesis and are instrumental in establishing and maintaining milk synthesis and secretion, whereas TJ integrity is compromised during mammary involution and also as result of mastitis and periods of mammary inflamation (including mastitis). They prevent the paracellular transport of ions and small molecules between the blood and milk compartments. Formation of intact TJ at the start of lactation is important for the establishment of the lactation. Conversely, loss of TJ integrity has been linked to reduced milk secretion and mammary function and increased paracellular transport of blood components into the milk and vice versa. In addition to acting as a paracellular barrier, the TJ is increasingly linked to playing an active role in intracellular signalling. This review focusses on the role of TJ in mammary function of the normal, non-malignant mammary gland, predominantly in ruminants, the major dairy producing species.

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Abbreviations

ECM:

Extracellular matrix

EGF:

Epidermal growth factor

IGF:

Insulin-like growth factor

LPS:

Lipopolysaccharide

LTA:

Lipoteichoic acid

MEC:

Mammary epithelial cell(s)

ODM:

Once-daily milking

TER:

Transepithelial electrical resistance

TGF:

Transforming growth factor

TJ:

Tight junction(s)

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  1. SciLactis Ltd, Waikato Innovation Park, Hamilton, 3240, New Zealand

    Kerst Stelwagen

  2. AgResearch Ltd, Ruakura Research Centre, Hamilton, 3240, New Zealand

    Kuljeet Singh

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  1. Kerst Stelwagen
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Stelwagen, K., Singh, K. The Role of Tight Junctions in Mammary Gland Function. J Mammary Gland Biol Neoplasia 19, 131–138 (2014). https://doi.org/10.1007/s10911-013-9309-1

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