Cited by 23Animal Genetics and ReproductionMolecular Biology Techniques and ApplicationsGenetically Modified Organisms Research

Whole Mount Enzyme Histochemistry as a Rapid Screen at Necropsy for Expression of β-Galactosidase ( LacZ )–Bearing Transgenes: Considerations for Separating Specific LacZ Activity from Nonspecific (Endogenous) Galactosidase Activity

Bolon, Brad·2008·Toxicologic Pathology

Abstract

Whole mount enzyme histochemistry to localize lacZ-bearing transgenes (lacZ-WMH) also detects endogenous β-galactosidases. The experiments reported here evaluated lacZ-WMH as a potential tool for transgene expression analysis during high-throughput rodent necropsies. A lacZ-WMH survey of organs from adult, wild-type, male and female mice (C57BL/6, FVB/N) and female rats (Sprague-Dawley) performed at the optimal pH (≥ 7.0) for bacterial lacZ yielded intense endogenous staining in the gonads, kidney, male accessory sex organs, salivary glands, submucosal glands in the duodenum, and thyroid. Substantial staining occurred in the adrenal cortex, lymph nodes, and linings of the gastrointestinal tract, the urinary bladder and uterus, and (for rat only) in the adenohypophysis, bone marrow, thymus, and trigeminal ganglia. Endogenous galactosidases were distributed similarly in sections of flash-frozen organs used for slide-based lacZ histochemistry (lacZ-SBH) at pH ≤ 5.0 (optimal for eukaryotic enzymes). Cerebral neurons were labeled only by lacZ-SBH. At pH 7.4, endogenous but not specific lacZ activity was abolished for lacZ-SBH, while endogenous activity was not halted without reducing specific activity for lacZ-WMH. These data demonstrate that lacZ-WMH is feasible during rodent necropsies for many but not all organs if species-, strain-, and sex-specific divergence in endogenous galactosidase activity is considered and special fixation (3% paraformaldehyde for 3 hours at 4°C) is used.

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Crossref · 10.1177/0192623307312693

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Authors
Bolon, B.
Affiliations
Processus d'Activation Sélective par Transfert d'Énergie Uni-électronique ou Radiatif (FR)
Corresponding author
Bolon, Brad
Venue
Toxicologic Pathology
Published
2008-02
Volume
36
Issue
2
Pages
265-276
ISSN
  • 0192-6233 (ISSN-L)
  • 1533-1601
OpenAlex
W2130564466
Cited by
23
References
45
Citations by year
2021: 3 · 2020: 4 · 2019: 1 · 2017: 2 · 2016: 1 · 2015: 4 · 2013: 1 · 2012: 3
FWCI
0.76
Type
journal article
Language
en
Open access
closed
Locations
  • Toxicologic Pathology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Animal Genetics and Reproduction
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Molecular Biology Techniques and Applications
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Genetically Modified Organisms Research
Keywords
beta-galactosidase, lacZ transgene, pH-dependent enzyme activity, paraformaldehyde fixation, sex differences in enzyme activity
MeSH terms
Animals, Autopsy, beta-Galactosidase, Female, Histocytochemistry, Lac Operon, Lung, Male, Mice, Inbred C57BL, Mice, Transgenic, Staining and Labeling, Gene Expression, Rats, Sprague-Dawley, Mice, Rats

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