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2015 ; 11
(10
): e1005173
Nephropedia Template TP
gab.com Text
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English Wikipedia
Influenza Transmission in the Mother-Infant Dyad Leads to Severe Disease, Mammary
Gland Infection, and Pathogenesis by Regulating Host Responses
#MMPMID26448646
Paquette SG
; Banner D
; Huang SS
; Almansa R
; Leon A
; Xu L
; Bartoszko J
; Kelvin DJ
; Kelvin AA
PLoS Pathog
2015[Oct]; 11
(10
): e1005173
PMID26448646
show ga
Seasonal influenza viruses are typically restricted to the human upper
respiratory tract whereas influenza viruses with greater pathogenic potential
often also target extra-pulmonary organs. Infants, pregnant women, and
breastfeeding mothers are highly susceptible to severe respiratory disease
following influenza virus infection but the mechanisms of disease severity in the
mother-infant dyad are poorly understood. Here we investigated 2009 H1N1
influenza virus infection and transmission in breastfeeding mothers and infants
utilizing our developed infant-mother ferret influenza model. Infants acquired
severe disease and mortality following infection. Transmission of the virus from
infants to mother ferrets led to infection in the lungs and mother mortality.
Live virus was also found in mammary gland tissue and expressed milk of the
mothers which eventually led to milk cessation. Histopathology showed destruction
of acini glandular architecture with the absence of milk. The virus was localized
in mammary epithelial cells of positive glands. To understand the molecular
mechanisms of mammary gland infection, we performed global transcript analysis
which showed downregulation of milk production genes such as Prolactin and
increased breast involution pathways indicated by a STAT5 to STAT3 signaling
shift. Genes associated with cancer development were also significantly increased
including JUN, FOS and M2 macrophage markers. Immune responses within the mammary
gland were characterized by decreased lymphocyte-associated genes CD3e, IL2Ra,
CD4 with IL1? upregulation. Direct inoculation of H1N1 into the mammary gland led
to infant respiratory infection and infant mortality suggesting the influenza
virus was able to replicate in mammary tissue and transmission is possible
through breastfeeding. In vitro infection studies with human breast cells showed
susceptibility to H1N1 virus infection. Together, we have shown that the
host-pathogen interactions of influenza virus infection in the mother-infant dyad
initiate immunological and oncogenic signaling cascades within the mammary gland.
These findings suggest the mammary gland may have a greater role in infection and
immunity than previously thought.