Science - USA (2021-11-05)

Huet al.,Science 374 , eabe6723 (2021) 5 November 2021 2 of 13

AB

D

C Anti-sense Sense

E

SPRR2A UEA-I DAPI Merge

WT

SPRR2A Lysozyme DAPI Merge

WT

101

102

103

104

Relative expression

Sprr2a

brain

thymus

heartlungliverspleenkidneyskin

bladder

white adipose

muscle

esophagus

stomach

small intestine

cecum

large intestine

ns

**

**

SI IEC LPL IEL

10 -2

10 -1

100

Relative expression

Sprr2a

Zoom

Zoom

Whole tissue Mucus layer Stool

Colon

SPRR2A

G

F

SPRR2A UEA-I DAPI

Small intestinal organoids

Zoom Zoom Merge

HI

Small intestine

Small intestine

UEA-I marks goblet cells and Paneth cells

Lysozyme marks Paneth cells UEA-I marks goblet cells and Paneth cells

Sprr2a

/

Sprr2a

/

GF CV GF CV

WT Myd88/

*

ns

0

1

2

3

4

Relative expression

Sprr2a Sprr2a

GF

GF + PBSGF + LPS

***

*

0

1

2

3

4

Relative expression

5

Fig. 1. SPRR2A is expressed in goblet cells and Paneth cells in the mouse
intestine.(A) Quantitative PCR (qPCR) analysis ofSprr2aexpression in
various organs of wild-type C57BL/6 mice. Values were normalized to 18SrRNA
expression.n= 3 mice per group. (B) qPCR analysis ofSprr2aexpression in
mouse small intestine (SI), small intestinal epithelial cells (IEC) acquired by laser
capture microdissection, lamina propria lymphocytes (LPL), and intraepithelial
lymphocytes (IEL). Values were normalized to 18SrRNA expression. (C) In situ
hybridization of small intestine sections with antisense and senseSprr2a
RNA probes. Examples of positive signals are indicated by yellow arrowheads.
Scale bar, 50mm. (DandE) Immunofluorescence detection of SPRR2A (red) in

sections of paraffin-embedded mouse small intestine.Ulexeuropaeusagglutinin-I

(UEA-I) (D) and anti-lysozyme antibody (E) were used to identify goblet cells

(UEA-I) and Paneth cells (UEA-I and anti-lysozyme). Nuclei were detected with

4 ′,6-diamidino-2-phenylindole (DAPI). Sections fromSprr2a−/−mice (generated

as shown in fig. S2) were used as negative controls. Scale bars, 50mm.

(F) Immunofluorescence detection of SPRR2A (red) in OCT-embedded frozen

sections of mouse small-intestinal organoids. Scale bars, 25mm. (G) Immunoblot

detection of SPRR2A protein in mouse colon, the colon mucus layer, and

stool samples. (H) qPCR analysis of epithelial cellSprr2aexpression in germ-free

(GF) wild-type (WT) andMyd88-deficient (Myd88−/−) C57BL/6 mice with or

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