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Source study found

Story checked

Smoking may affect fertility in both men and women (opens in a new tab)

medicalxpress.com · 2026-10-13

Short answerEvidenceSource

Short answer

Mixed

Mixed.

One claim goes further than the study. 2 other points were not covered by the paper.

  • 2 supported
  • 1 overstated
  • 2 not covered

Checked against the study summary. The full text wasn't available, so some details couldn't be settled either way.

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Follow the evidence trail
1
2

NewsLink checks it

Mixed

One claim overstates the study. Two of five check out. Two claims the study doesn't address.

  • 2 supported
  • 1 overstated
  • 2 not covered
Open claim evidence
3

The source study

Cigarette smoke extract exposure induces differential morphological and transcriptional responses in the ovary and testes of mice

Frontiers in Toxicology · 2026
Open source record (opens in a new tab)
Then inspect each claim

Evidence layer

Claim by claim

Each claim gets a verdict. Expand it to see the evidence directly below.

5 claims in this story

Showing all 5 claimsChoose a verdict to focus the list.

Claim 1 of 5OverstatedA new study from researchers at the Universities of Nottingham and Sheffield, published in Frontiers, found that cigarette-smoke exposure could affect reproductive health in both men and women by changing biological processes involved in ovarian function and sperm production.View evidenceHide evidence

Why this verdict

The abstract-level profile supports sex-specific gonadal histology and transcriptomic changes in mice exposed to cigarette smoke extract, including ovarian gene-expression changes and testicular changes related to spermatogenesis. However, the lead frames this as affecting reproductive health in 'men and women,' while the paper evidence is an intranasal mouse CSE model and did not measure human reproductive health or fertility outcomes. The hedge 'could' helps, but the human reproductive-health framing outruns the paper evidence.

1

Study evidence

No measurable change in ovarian histology between control, 1%, and 3% CSE exposure groups.

“Sixteen eight-week-old male and female C57BL/6J mice were sedated with isoflurane and administered either the 1%, 3% or control (RPMI medium alone) intranasally three times per week for 12 weeks.”
2

Study evidence

No measurable change in ovarian histology was reported between control, 1% and 3% CSE exposure groups.

“After 12 weeks, ovarian and testicular tissues were collected for either histological analysis of tissue morphology (n = 4 mice per male/female gonad)”
Claim 2 of 5Not coveredIn females, ovarian follicles showed relatively little structural change after smoke exposure, but many genes changed activity, including genes involved in cell division and metabolism that became less active and genes linked to protein production that became more active.View evidenceHide evidence

Why this verdict

The abstract-level profile supports no measurable ovarian histological change and supports ovarian transcriptomic changes, including downregulation of cell-division-related genes and increased ribosomal protein expression. However, the abstract profile does not verify the more specific follicle-level framing or the claim that metabolism-related genes became less active. Those details may require full-text gene lists or pathway analyses.

1

Study evidence

No measurable change in ovarian histology was reported between control, 1% and 3% CSE exposure groups.

“After 12 weeks, ovarian and testicular tissues were collected for either histological analysis of tissue morphology (n = 4 mice per male/female gonad)”
2

Study evidence

Ovarian transcriptome changes after 12 weeks of intranasal CSE (1% and 3%) included significant downregulation of transcription factors and genes regulating cell division, and increased expression of multiple ribosomal protein genes.

“...or for transcriptomic analysis by microarray (n = 4 mice per male/female gonad).”
Claim 3 of 5Not coveredIn males, higher smoke exposure was associated with changes in testicular structure, including enlargement of the seminiferous tubules, and changes in genes involved in sperm production, immune responses and cell signaling.View evidenceHide evidence

Why this verdict

The abstract-level profile supports a significant increase in mean seminiferous tubule cross-sectional area in the 3% CSE group and testicular differential expression involving immune responses and spermatogenesis/male fertility. It does not verify the additional 'cell signaling' gene-category claim at abstract depth.

1

Study evidence

No measurable change in ovarian histology was reported between control, 1% and 3% CSE exposure groups.

“After 12 weeks, ovarian and testicular tissues were collected for either histological analysis of tissue morphology (n = 4 mice per male/female gonad)”
2

Study evidence

Ovarian transcriptome changes after 12 weeks of intranasal CSE (1% and 3%) included significant downregulation of transcription factors and genes regulating cell division, and increased expression of multiple ribosomal protein genes.

“...or for transcriptomic analysis by microarray (n = 4 mice per male/female gonad).”
Claim 4 of 5SupportedIn a mouse model, researchers tested different levels of cigarette-smoke exposure on the ovaries and testes and examined changes in reproductive tissues and gene activity.View evidenceHide evidence

Why this verdict

The paper profile directly describes an in vivo mouse model with control, 1% and 3% CSE exposure, followed by ovarian and testicular histology and microarray-based transcriptomic profiling.

1

Study evidence

No measurable change in ovarian histology between control, 1%, and 3% CSE exposure groups.

“Sixteen eight-week-old male and female C57BL/6J mice were sedated with isoflurane and administered either the 1%, 3% or control (RPMI medium alone) intranasally three times per week for 12 weeks.”
2

Study evidence

No measurable change in ovarian histology was reported between control, 1% and 3% CSE exposure groups.

“After 12 weeks, ovarian and testicular tissues were collected for either histological analysis of tissue morphology (n = 4 mice per male/female gonad)”
Claim 5 of 5SupportedThe researchers said further research is needed to establish how these biological changes relate to fertility in humans.View evidenceHide evidence

Why this verdict

The paper profile’s limitations support the substance of this caveat: the work is a mouse CSE model, translational relevance to human smoking is limited, and functional fertility consequences are not described. The exact quotation is not independently verifiable from the abstract-level profile, but the stated limitation is consistent with the paper evidence.

1

Study evidence

No measurable change in ovarian histology between control, 1%, and 3% CSE exposure groups.

“Sixteen eight-week-old male and female C57BL/6J mice were sedated with isoflurane and administered either the 1%, 3% or control (RPMI medium alone) intranasally three times per week for 12 weeks.”
2

Study evidence

Ovarian transcriptome changes after 12 weeks of intranasal CSE (1% and 3%) included significant downregulation of transcription factors and genes regulating cell division, and increased expression of multiple ribosomal protein genes.

“...or for transcriptomic analysis by microarray (n = 4 mice per male/female gonad).”
Then look for missing context

Context layer

What the story left out

Important study details the story did not include.

  • Exposure was by intranasal administration of cigarette smoke extract diluted in RPMI, not whole-smoke inhalation; this limits translation to human smoking exposure patterns.

    The story mentions a mouse model and human-translation uncertainty, but it does not mention the specific intranasal CSE exposure model or the limitation that this differs from whole-smoke inhalation.

    From in vivo mouse CSE intranasal exposure

  • Small endpoint group sizes were reported, with n=4 per sex/gonad per assay, limiting precision and robustness.

    The story’s caveats do not mention the small sample sizes, which are material for interpreting the strength and reliability of the histology and transcriptomic results.

    From in vivo mouse CSE intranasal exposure; in_vivo_mouse_histology; In vivo intranasal CSE exposure; microarray transcriptom

  • At abstract depth, quantitative effect sizes, detailed statistics, full gene lists and transcriptomic validation details are not provided.

    The story does not acknowledge that the available abstract-level evidence lacks effect sizes, p-values, full gene lists, statistical thresholds or independent validation details.

    From in_vivo_mouse_histology; In vivo intranasal CSE exposure; microarray transcriptomics

  • The study used a single mouse strain and adult age at exposure onset, so strain- or age-specific effects cannot be excluded.

    The story notes that the work was in mice, but it does not mention the single-strain/adult-age limitation.

    From in vivo mouse CSE intranasal exposure

4 things the story did carry across
  • The study used an in vivo adult C57BL/6J mouse model with control, 1% and 3% cigarette smoke extract exposure, followed by ovary and testis collection for histology and transcriptomics.
  • Female mice showed no measurable ovarian histology change, while ovarian transcriptomics showed downregulation of transcription factors and cell-division genes and increased ribosomal protein expression.
  • Male mice exposed to 3% CSE showed increased mean seminiferous tubule cross-sectional area and testicular differential gene expression associated with immune responses, spermatogenesis and male fertility.
  • The study did not establish functional fertility outcomes or direct effects on human fertility.
Then read the study layer

Study layer

Study at a glance

Scan the study first. Expand only the parts you want to inspect.

Pieces of work

4

Evidence read

study summary

Lead result

in vivo animal

1Lead resultin vivo animalCharacterize gonadal transcriptomic responses (ovary vs testes) to CSE exposure to suggest molecular pathways potentially underlying smoke-related reproductive toxicity.In vivo intranasal CSE exposure; microarray transcriptomicsExpand

In plain English

In an in vivo mouse model, intranasal exposure to cigarette smoke extract (CSE) at 1% or 3% (diluted in RPMI) three times weekly for 12 weeks (n = 4 mice per sex per group for transcriptomics) produced sex-specific gonadal transcriptional changes by microarray. Ovarian samples from exposed females showed significant downregulation of transcription factors and genes regulating cell division and increased expression of multiple ribosomal proteins at both 1% and 3% exposure. Testicular samples from exposed males showed differential expression of genes annotated to immune responses, spermatogenesis, and male fertility. The authors interpret these data as evidence of differential molecular responses of ovary and testes to CSE that could contribute to smoke-related reproductive toxicity.

Key findings

  • Ovarian transcriptome changes after 12 weeks of intranasal CSE (1% and 3%) included significant downregulation of transcription factors and genes regulating cell division, and increased expression of multiple ribosomal protein genes.
  • Testicular transcriptome differences across exposure groups included differential expression of genes annotated to immune responses, spermatogenesis, and male fertility.
“...or for transcriptomic analysis by microarray (n = 4 mice per male/female gonad).”
What this piece can’t prove
  • Transcriptomic analyses are reported with n = 4 mice per sex per group; small sample size may limit power and generalizability.
  • Abstract does not report microarray platform details, normalization/statistical thresholds, numbers of DE genes, or independent validation of expression changes.
  • Exposure model uses intranasal delivery of cigarette smoke extract diluted in RPMI, which may differ from whole-smoke inhalation exposure paradigms; abstract does not provide dosimetry or internal exposure measurements.

1 further detail could not be confirmed from the summary.

2in vivo animalDetermine whether chronic intranasal exposure to light- (1%) or heavy-dose (3%) cigarette smoke extract (CSE) alters ovarian and testicular outcomes in adult C57BL/6J mice.in vivo mouse CSE intranasal exposureExpand

In plain English

In an in vivo C57BL/6J mouse study, researchers administered intranasal cigarette smoke extract (CSE) diluted in RPMI (control, 1%, 3%) three times weekly for 12 weeks (16 mice total). Ovaries and testes were collected for either histological analysis or transcriptomic profiling (microarray), with n=4 mice per sex per gonad per endpoint. The study reports no detectable ovarian histological changes but observed ovarian transcriptional changes (downregulation of transcription factors and cell-division genes; increased ribosomal protein expression in exposed females). In males, a larger mean seminiferous tubule cross-sectional area was reported in the 3% group, and transcriptomic changes related to immune responses, spermatogenesis, and male fertility were identified.

Key findings

  • No measurable change in ovarian histology between control, 1%, and 3% CSE exposure groups.
  • Significant downregulation of transcription factors and genes regulating cell division in ovaries of mice exposed to 1% and 3% CSE.
“Sixteen eight-week-old male and female C57BL/6J mice were sedated with isoflurane and administered either the 1%, 3% or control (RPMI medium alone) intranasally three times per week for 12 weeks.”
What this piece can’t prove
  • Exposure model used intranasal administration of cigarette smoke extract in RPMI rather than whole-smoke inhalation; translational relevance to human smoking inhalation patterns is limited by the model choice.
  • Study performed in a single mouse strain (C57BL/6J) and adult age at exposure onset; strain- or age-specific effects cannot be excluded.

2 further details could not be confirmed from the summary.

3in vivo animalDetermine whether chronic intranasal exposure to light- (1%) or heavy-dose (3%) cigarette smoke extract (CSE) alters ovarian and testicular outcomes in adult C57BL/6J mice.in vivo mouse histologyExpand

In plain English

In an in vivo mouse study, adult C57BL/6J mice received intranasal cigarette smoke extract (CSE) at 0% (control), 1% (light) or 3% (heavy) three times per week for 12 weeks. Ovarian and testicular tissues were collected for histological analysis (n = 4 mice per sex/gonad). No measurable change in ovarian histology was reported across groups; in males, a significant increase in mean seminiferous tubule cross-section area was reported for the 3% CSE group.

Key findings

  • No measurable change in ovarian histology was reported between control, 1% and 3% CSE exposure groups.
  • Males exposed to 3% CSE showed a significant increase in mean seminiferous tubule cross-section area.Reported increase in mean seminiferous tubule cross-sectional area in 3% CSE-exposed males (statistical significance reported in abstract).
“After 12 weeks, ovarian and testicular tissues were collected for either histological analysis of tissue morphology (n = 4 mice per male/female gonad)”
What this piece can’t prove
  • Small reported sample size for histology (n = 4 per sex/gonad) may limit precision; power and variance not reported in abstract.
  • Abstract does not report histological processing details (fixation, staining, sectioning), scoring criteria, or blinded assessment procedures.
  • Findings for transcriptomic endpoints and functional fertility outcomes are reported elsewhere in the paper but are outside the scope of this histology-focused unit.

1 further detail could not be confirmed from the summary.

4in vivo animalAssess whether the exposure regimen produces overt animal-welfare detriments during the 12-week study.In vivo animal intranasal exposure with reported welfare monitoring (abstract-level)Expand

In plain English

The authors state that "No detrimental impact of our cigarette smoke extracts on animal welfare was observed." This refers to mice exposed intranasally to 1% or 3% cigarette smoke extract three times per week for 12 weeks. The abstract does not provide details of the welfare monitoring methods, metrics, or quantitative data supporting this statement.

Key findings

  • Authors reported no detrimental impact of cigarette smoke extracts on animal welfare during the 12-week intranasal exposure regimen.
“No detrimental impact of our cigarette smoke extracts on animal welfare was observed.”
What this piece can’t prove

3 further details could not be confirmed from the summary.

Finally, the search trail

Method layer

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NewsLink checks the story. Tessa is where you inspect the paper, authors, evidence, and research context.

Open the paper in Tessa

Cigarette smoke extract exposure induces differential morphological and transcriptional responses in the ovary and testes of mice

Frontiers in Toxicology · 2026

Source record (opens in a new tab)

Why this one

Near certain

NewsLink found the paper. Tessa is where you inspect it deeply.

Papers considered

The selected paper, plus nearby candidates.

Crossref, PubMed, Europe PMC · 16 candidate papers

Selected

Cigarette smoke extract exposure induces differential morphological and transcriptional responses in the ovary and testes of mice

Frontiers in Toxicology · 2026 · Crossref

Source (opens in a new tab)
Candidate

Regulation of Human MUC7 Mucin Gene Expression by Cigarette Smoke Extract or Cigarette Smoke and Pseudomonas aeruginosa Lipopolysaccharide in Human Airway Epithelial Cells and in MUC7 Transgenic Mice

The Open Respiratory Medicine Journal · 2010 · Crossref

Source (opens in a new tab)

And 10 more candidates considered.