Detection of mouse parvovirus in Mus musculus gametes, embryos, and ovarian tissues by polymerase chain reaction assay

We used primary and nested polymerase chain reaction (PCR) assays to determine the presence of mouse parvovirus (MPV) in mouse sperm, oocytes, preimplantation embryos, and ovarian tissues collected from MPV-infected mice. The primary PCR assay detected MPV in 56% of the sperm samples. MPV was not eliminated by passing sperm samples through a Percoll gradient. After Percoll treatment, MPV was still present in 50% of the samples according to primary PCR assay. Oocyte samples that did not undergo extensive washing procedures had detectable MPV in 7% of the samples based on the primary PCR assay, but nested PCR assay detected higher (28%) infection rate. However, MPV was not detected in oocytes that underwent extensive washing procedures, as assessed by either primary or nested PCR assay. Although primary PCR did not detect MPV in embryos, a nested PCR assay determined that 50% of the embryos were positive for the virus. In addition, ovarian tissues were collected from 3 different mouse colonies with enzootic MPV infection. Ovarian tissue collected from 129CT, 101/R1, and Sencar mice had high incidence (38%, 63%, and 65%, respectively) of MPV infection on the basis of nested PCR amplification. These results demonstrate that mouse gametes, embryos, and ovarian tissues may be contaminated with MPV and therefore caution is necessary when infected germplasm is used for assisted reproductive technologies such as embryo transfer, establishing embryonic stem cell lines, in vitro fertilization, ovary transplantation, and intracytoplasmic sperm injection.     

金葡菌L型感染在卵巢癌中检测的意义

目的探讨金葡菌L型感染在卵巢癌中检测的意义。方法应用革兰染色、免疫组织化学染色技术检测HO-8910PM细胞株以及97例卵巢乳头状癌、23例卵巢乳头状瘤石蜡包埋组织中细菌L型的感染情况。结果（1）HO-8910PM细胞与金葡菌L型体外共培养后在肿瘤细胞的胞浆及胞核中检测到L型的阳性表达。（2）卵巢乳头状癌和乳头状瘤组织中,细菌L型感染率分别为25.8%（25/97）和13.0%（3/23）。L型检出率与卵巢癌的临床分期、病理分级及腹腔淋巴结转移的差异均有显著性（P〈0.005）,与组织学类型无关（P〉0.05）。结论金葡菌L型可以进入细胞内,并能够在一定程度上促进卵巢癌的发生、发展。     

卵巢癌患者术后阴道微生态分析

目的 对卵巢癌患者术后阴道微生态特征进行回顾性分析,为临床预防及诊疗提供参考.方法 选取158例卵巢癌术后患者为卵巢癌组,150例同期健康体检者为对照组,对留取样本进行革兰染色镜检及阴道五项联检检测,并对阴道微生态结果进行统计分析.结果 卵巢癌组阴道五联检各指标异常率高于对照组(均P＜0.05).革兰染色油镜镜检联合五...     

Intraovarian Transplantation of Female Germline Stem Cells Rescue Ovarian Function in Chemotherapy-Injured Ovaries

Early menopause and infertility often occur in female cancer patients after chemotherapy (CTx). For these patients, oocyte/embryo cryopreservation or ovarian tissue cryopreservation is the current modality for fertility preservation. However, the above methods are limited in the long-term protection of ovarian function, especially for fertility preservation (very few females with cancer have achieved pregnancy with cryopreserved ovarian tissue or eggs until now). In addition, the above methods are subject to their scope (females with no husband or prepubertal females with no mature oocytes). Thus, many females who suffer from cancers would not adopt the above methods pre- and post-CTx due to their uncertainty, safety and cost-effectiveness. Therefore, millions of women have achieved long-term survival after thorough CTx treatment and have desired to rescue their ovarian function and fertility with economic, durable and reliable methods. Recently, some studies showed that mice with infertility caused by CTx can produce normal offspring through intraovarian injection of exogenous female germline stem cells (FGSCs). Though exogenous FGSC can be derived from mice without immune rejection in the same strain, it is difficult to obtain human female germline stem cells (hFGSCs), and immune rejection could occur between different individuals. In this study, infertility in mice was caused by CTx, and the ability of FGSCs to restore ovarian function or even produce offspring was assessed. We had successfully isolated and purified the FGSCs from adult female mice two weeks after CTx. After infection with GFP-carrying virus, the FGSCs were transplanted into ovaries of mice with infertility caused by CTx. Finally, ovarian function was restored and the recipients produced offspring long-term. These findings showed that mice with CTx possessed FGSCs, restoring ovarian function and avoiding immune rejection from exogenous germline stem cells.     

VEGF、KDR和细菌L型感染在卵巢肿瘤中的表达及临床相关性研究

目的探讨血管内皮生长因子（VEGF）及其受体VEGFR-2（KDR）和细菌L型感染在卵巢肿瘤中的表达及临床相关性研究。方法应用免疫组化、原位杂交和革兰染色等方法检测了120例卵巢肿瘤中的VEGF、KDR蛋白及mRNA的表达,以及细菌L型的检出率。并对97例卵巢乳头状癌和23例卵巢乳头状瘤主要临床资料和病理分级参数进行比较,用χ^2检验进行统计学处理。结果VEGF、KDR蛋白及mRNA阳性表达率恶性肿瘤明显高于良性肿瘤（P〈0．005）。细菌L型检出阳性率与卵巢良、恶性肿瘤差异无显著性（P〉0．5）。VEGF、KDR蛋白及mRNA阳性表达以及细菌L型检出阳性率与卵巢乳头状癌的临床分期、病理分级和腹腔淋巴结有转移、腹水差异有显著性（P〈0．001—0．05）。细菌L型阳性患者中VEGF、KDR阳性明显高于L型阴性患者中阳性表达,2组差异具有非常显著性（P〈0．0001）。结论VEGF、KDR蛋白及mRNA在卵巢肿瘤中有不同程度的异常表达,与卵巢癌的临床分期、病理分级和浸润、转移呈正相关,L型感染极有可能成为诱发肿瘤因素之一,它们可能有协同致瘤作用。研究L型感染与卵巢肿瘤的关系,具有重要的临床应用价值。     

Co-expression of the SARS-CoV-2 entry molecules ACE2 and TMPRSS2 in human ovaries: Identification of cell types and trends with age

The high rate of SARS-CoV-2 infection poses a serious threat to public health. Previous studies have suggested that SARS-CoV-2 can infect human ovary, the core organ of the female reproductive system. However, it remains unclear which type of ovarian cells are easily infected by SARS-CoV-2 and whether ovarian infectivity differs from puberty to menopause. In this study, public datasets containing bulk and single-cell RNA-Seq data derived from ovarian tissues were analyzed to demonstrate the mRNA expression and protein distribution of the two key entry receptors for SARS-CoV-2—angiotensin-converting enzyme 2 (ACE2) and type II transmembrane serine protease (TMPRSS2). Furthermore, an immunohistochemical study of ACE2 and TMPRSS2 in human ovaries of different ages was conducted. Differentially expressed gene (DEG) analysis of ovaries of different ages and with varying ovarian reserves was conducted to explore the potential functions of ACE2 and TMPRSS2 in the ovary. The analysis of the public datasets indicated that the co-expression of ACE2 and TMPRSS2 was observed mostly in oocytes and partially in granulosa cells. However, no marked difference was observed in ACE2 or TMPRSS2 expression between young and old ovaries and ovaries with low and high reserves. Correspondingly, ACE2 and TMPRSS2 were detected in the human ovarian cortex and medulla, especially in oocytes of different stages, with no observed variations in their expression level in ovaries of different ages, which was consistent with the results of bioinformatic analyses. Remarkably, DEG analysis showed that a series of viral infection-related pathways were more enriched in ACE2-positive ovarian cells than in ACE2-negative ovarian cells, suggesting that SARS-CoV-2 may potentially target specific ovarian cells and affect ovarian function. However, further fundamental and clinical research is still needed to monitor the process of SARS-CoV-2 entry into ovarian cells and the long-term effects of SARS-CoV-2 infection on the ovarian function in recovered females.     

Pathological Evidence for Residual SARS-CoV-2 in the Micrometastatic Niche of a Patient with Ovarian Cancer

In previous clinical studies, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection in cancer patients has a high risk of aggravation and mortality than in healthy infected individuals. Inoculation with coronavirus disease 2019 (COVID-19) vaccine reduces the risk of SARS-CoV-2 infection and COVID-19 severity. However, vaccination-induced anti-SARS-CoV-2 antibody production is said to be lower in cancer patients than in healthy individuals. In addition, the rationale for why the condition of patients with cancer worsens with COVID-19 is not well understood. Therefore, we examined the infection status of SARS-CoV-2 in the primary tumor and micrometastasis tissues of the patient with cancer and COVID-19. In this study, the expression of angiotensin-converting enzyme 2 (ACE2) was observed, and SARS-CoV-2 particles was detected in ovarian tissue cells in contact with the micrometastatic niche of the patient with high-grade serous ovarian cancer. We believe that the severity of COVID-19 in patients with cancer can be attributed to these pathological features. Therefore, the pathological findings of patients with advanced and recurrent ovarian cancer infected with SARS-CoV-2 may help decrease COVID-19 severity in patients with other cancer types.     

hMSH2、PCNA蛋白和金葡菌L型感染在卵巢肿瘤中的临床意义

目的 探讨hMSH2(human mut shomolog 2)基因、增殖细胞核抗原(proliferating cell nuclear antigen,PCNA)和金葡菌L型感染在卵巢肿瘤中的表达及临床意义.方法 用免疫组化法检测97例卵巢乳头状癌及23例卵巢乳头状瘤组织中hMSH2、PCNA蛋白以及金葡菌L型抗原的表达,用革兰染色法检测这些组织中有无L型细菌的存在,并用x2检验进行统计学处理.结果 hMSH2蛋白在卵巢恶性肿瘤组织中的阳性表达率明显低于良性肿瘤的(P＜0.01),在卵巢乳头状癌中临床分期Ⅰ、Ⅱ期表达率明显高于Ⅲ、Ⅳ期(P＜0.01),随着病理分级增高而显著降低(P＜0.05),腹腔淋巴结无转移者、无腹水者比有转移、有腹水者明显增高(P ＜0.01 ～0.05).而PCNA蛋白在卵巢恶性肿瘤组织中的阳性表达率明显高于良性肿瘤的(P＜0.01),在卵巢乳头状癌中临床分期Ⅲ、Ⅳ期的表达明显高于Ⅰ、Ⅱ期(P＜0.05),随着病理分级增高而显著增加(P＜0.05),腹腔淋巴结有转移者比无转移者明显增高(P＜0.05),有无腹水者之间差异无统计学意义(P＞0.05).金葡菌L型抗原阳性表达和L型菌的检出率与病理分级、临床分期有明显相关性(P＜0.05),有腹腔淋巴结转移、有腹水者均高于无转移和无腹水者(P＜0.01).结论 hMSH2、PCNA蛋白在卵巢肿瘤中有不同程度的异常表达,均可作为判断卵巢肿瘤生物学行为及患者预后的参考指标,金葡菌L型的感染极有可能导致基因的突变或过表达,因此L型感染可能成为诱发肿瘤形成的原因之一,它们相互协同在卵巢肿瘤发生和发展过程中起重要作用.     

Chlamydia trachomatis impairs host base excision repair by downregulating polymerase β

Chlamydia trachomatis infections have been associated with ovarian cancer by several epidemiological studies. Here, we show that C. trachomatis‐infected primary human ovarian epithelial cells display elevated oxidative DNA damage. Base excision repair, an important cellular mechanism to repair oxidative DNA lesions, was impaired in infected primary ovarian and in several other types of cells. Polymerase β was downregulated in infected cells associated with upregulation of microRNA‐499a (miR‐499a). Stabilising polymerase β by inhibiting miR‐499a significantly improved repair. Moreover, downregulation of tumour suppressor p53 also resulted in attenuated repair in these cells. Thus, our data show that downregulation of polymerase β by direct inhibition through miR‐499a and downregulation of p53 debilitate the host‐cell base excision repair during C. trachomatis infection.     

3H-oestradiol-17β counter current transfer from the ovarian vein into the ovarian artery in cows

During laparatomy the ovary in the luteal phase with the ovarian pedicle was isolated and transferred under stereomicroscope. The ovary was supplied with blood flowing out of the facial artery through a cannula. ³H-oestradiol-17β or ⁵¹Cr-labelled red blood cells (⁵¹Cr-RBC) were infused for 30 min through the cannula inserted into the ovarian vein 3 cm below the ovary. During and 30 min after the ³H-oestradiol-17β infusion, radioactivity was found both in the ovarian arterial blood near the ovary and in ovarian tissue. When ⁵¹Cr-RBC were infused in the same way as ³H-oestradiol, there was no radioactivity in the arterial blood or ovarian tissue. These experiments indicate the existence of a counter current transfer of ³H-oestradiol-17β from the ovarian vein into the ovarian artery in a cow's ovarian pedicle.     

A new route of prostaglandin F-2α transfer from the uterus into the ovary in swine

On day 14 of the oestrous cycle in swine, laparotomy under general anaesthesia was performed and both ovaries with their ovarian pedicles and with part of the uterine horns were isolated using ligatures and excised as two independent units which were called A and B. They were placed in separate aluminium paper boxes on a heated surface (40°C). Preparation A was supplied with autologous arterial blood through the uterine artery and through the ovarian artery. The mesosalpinx of this preparation covered the ovary of preparation B from which the mesosalpinx was excised. Preparation B was also supplied with autologous blood through the ovarian artery. Tritiated prostaglandin F-2α (³H-PGF-2α) was injected into the musculature of the uterine horn of preparation A and then both preparations were perfused with blood of the same animal for 30 min. ³H-PGF-2α was found in the ovarian venous blood, interstitial fluid, and ovarian and pedicle tissue of preparation B. The data indicate an extravascular penetration of ³H-PGF-2α into the ovary through the mesosalpinx.     

Chlamydia trachomatis,Chlamydial Heat Shock Protein 60 and Anti-Chlamydial Antibodies in Women with Epithelial Ovarian Tumors

OBJECTIVE: Chlamydia trachomatis (C. trachomatis) infection has been suggested to promote epithelial ovarian cancer (EOC) development. This study sought to explore the presence of C. trachomatis DNA and chlamydial heat shock protein 60 (chsp60) in ovarian tissue, as well as anti-chlamydial IgG antibodies in plasma, in relation to subtypes of EOC. METHODS: This cross-sectional cohort consisted of 69 women who underwent surgery due to suspected ovarian pathology. Ovarian tissue and corresponding blood samples were collected at the time of diagnosis. In ovarian tumor tissue, p53, p16, Ki67 and chsp60 were analyzed immunohistochemically, and PCR was used to detect C. trachomatis DNA. Plasma C. trachomatis IgG and cHSP60 IgG were analyzed with a commercial MIF-test and ELISA, respectively. RESULTS: Eight out of 69 women had C. trachomatis DNA in their ovarian tissue, all were invasive ovarian cancer cases (16.7% of invasive EOC). The prevalence of the chsp60 protein, C. trachomatis IgG and cHSP60 IgG in HGSC, compared to other ovarian tumors, was 56.0% vs. 37.2% P = .13, 15.4% vs. 9.3% P = .46 and 63.6% vs. 45.5% P = .33 respectively. None of the markers of C. trachomatis infection were associated with p53, p16 or Ki67. CONCLUSIONS: C. trachomatis was detected in invasive ovarian cancer, supporting a possible role in carcinogenesis of EOC. However, there were no statistically significant associations of chsp60 in ovarian tissue, or plasma anti-chlamydial IgG antibodies, with any of the subtypes of ovarian tumors.     

The structure of the ovarian ball and oogenesis in Moniliformis dubius (Acanthocephala)

Seven to nine days after infection of the definitive host (rat) by cystacanths, the genital primordium of the female acanthocephalan is transformed from a fragmented mass of cells into discrete ovarian balls. This is accomplished by envelopment of free germinal cells by somatic tissue which originates from the ligament sac primordium. Germinal cell nuclei then undergo repeated mitoses until about 21 days of development, with concurrent formation of oogonial syncytia which occupy the interior of the ovarian balls. Oocytes, derived from these oogonia, move to the periphery of the germinal syncytia for differentiation, growth, fertilization, shell formation, and release from the ovarian ball. After oogonial proliferation ceases, continued growth of the ovarian ball apparently results from increase in size of already present cells. Free-floating mature ovarian balls are found in the dorsal ligament sac; each consists of germ cells in various developmental stages, enveloped and pervaded by a multinucleate matrix syncytium of somatic origin, which functions as a follicle. Spermatozoa pass through the matrix cell for the internal fertilization of mature oocytes. Myelinated structures of an undetermined nature were found to correspond to previously reported polar bodies. After 100 days post-infection, the somatic matrix syncytium begins to manifest the degenerative effects of aging. The germinal tissue exhibits no subcellular signs of senescence by 154 days, but decreases in amount in older worms.     

Maintenance of unimplanted fertilized ova in sprayed rats. IV. Effects of duration of ovarian hormone deprivation and progesterone therapy prior to the deprivation

Studies were carried out in the spayed-rat delayed-implantation model to determine whether progesterone treatment prior to an ovarian hormone deprivation during the pre-implantation period would influence the incidence of subsequent delayed ovo-implantation induced with progesterone plus estrone. Implantation was rarely induced with 4 mg progesterone plus 1 microgram estrone/day after 5 to 11 days of ovarian hormone deprivation in rats that were spayed on Day 3, if progesterone treatment were not given before ovarian hormone deprivation. In contrast to this, implantation was fairly consistently induced with 4 mg progesterone plus 1 microgram estrone/day after 3, 5, 7, or 11 days of ovarian hormone deprivation in rats that were spayed on Day 3 and received 4 mg progesterone/day before the deprivation period (i.e., on Days 2 through 3, 2 through 6, or 2 through 8). The post-implantation viability of the embryos of the dams undergoing the longer periods of ovarian hormone deprivation, however, was reduced.     

Pathogenicity of the protozoan parasite Marteilioides chungmuensis in the Pacific oyster Crassostrea gigas

Marteilioides chungmuensis is an ovarian parasite that causes nodule-like structures to appear on the gonads of female Pacific oysters, Crassostrea gigas. It is known that the prevalence of infection increases in summer and decreases from autumn to spring. To investigate the decrease in prevalence of infection and pathogenicity of the parasite, a biopsy method was developed to detect infected oysters, which were then monitored to calculate the mortality rate. Mortality of infected oysters was recorded monthly and changes in reproductive development observed histologically. Compared with control groups, a significant difference in mortality was observed in infected oysters in September and October. Histological observations showed that infected oysters produced oocytes continuously, even in autumn when healthy oysters were reproductively inactive. This prolonged spawning activity of infected oysters resulted in nutritional wasting and mortality. From December onwards, however, almost all infected oysters survived, though the infection persisted. Infection intensity decreased gradually from December. Histological observations revealed that, in winter, infected oysters released infected and uninfected oocytes through the genital canal. The gonad subsequently degenerated and was replaced with connective tissue, as in normal, healthy spent oysters. The results revealed that prevalence of infection decreased from September to May. It is hypothesised that the decline in prevalence within the epizootic area in autumn occurred because infected oysters died and that the winter decrease was due to recovery from infection.     

Comparative transcriptome analysis reveals PERP upregulated during Salmonella Enteritidis challenge in laying ducks

Salmonella Enteritidis (SE) can be transmitted to eggs through cecum or the ovary from infected layers and causes food poisoning in humans. The mechanism of cecal transmission has been extensively studied. However, the mechanism and route of transovarian transmission of SE remain unclear. In this study, the ducks were orally inoculated with SE, and the ovarian follicles and stroma were collected to detect SE infection. The immune responses were triggered and the innate and adaptive immune genes (TLR4, NOD1, AvβD7, and IL-1β) were upregulated significantly during the SE challenge. Moreover, the ovary tissues (small follicle and stroma) of susceptible and resistant–laying ducks were performed by RNA sequencing. We obtained and identified 23 differentially expressed genes (DEGs) between susceptible and resistant–laying ducks in both small follicle and stroma tissues ( p < 0.05). The DEGs were predominately identified in the p53 signaling pathway. The expression of key genes (p53, MDM2, PERP, caspase-3, and Bcl-2) involved in the signaling pathway was significantly higher in granulosa cells (dGCs) from SE-infected ducks than those from uninfected ducks. Moreover, the overexpression of PERP resulted in further induction of p53, MDM2, caspase-3, and Bcl-2 during SE infection in dGCs. Whereas, an opposite trend was observed with the knockdown of PERP. Besides, it is further revealed that the PERP could enhance cell apoptosis, SE adhesion, and SE invasion in SE-infected dGCs overexpression. Altogether, our results demonstrate the duck PERP involved in the ovarian local immune niche through p53 signaling pathway in dGCs challenged with SE.     

DO VARIABLE COMPENSATORY MECHANISMS EXPLAIN THE POLYMORPHISM OF THE DEPENDENCE PHENOTYPE IN THE ASOBARA TABIDA‐WOLBACHIA ASSOCIATION?

Wolbachia are symbiotic intracellular bacteria, which are classified as reproductive parasites. Although generally facultative, Wolbachia is necessary for Asobara tabida (Hymenoptera), because aposymbiotic females do not produce any offspring. Interestingly, the ovarian phenotype of aposymbiotic females is variable: some females do not produce any eggs, whereas others do produce some eggs, but these are aborted. Here, we show that the ovarian phenotype of aposymbiotic females is highly polymorphic within populations, although dependence remains complete in both cases. We also identified some lines in which aposymbiotic females were able to produce a very few viable offspring, further extending the range of variation observed. These results suggest that various factors actively maintain polymorphism. We demonstrated that Wolbachia is necessary to trigger oogenetic processes, but that the ovarian phenotype was determined by the host only. Phenotypic variation was also correlated with the differential expression of genes controlling iron homeostasis and oxidative stress, which are potentially involved in the evolution of dependence. This suggests that variation in the ovarian phenotype could reflect selection for different levels of compensatory mechanisms in response to Wolbachia infection, and that polymorphism is maintained through selection on different antagonist traits influenced by oxidative stress.     

COX-2、Ki-67和细菌L型感染在卵巢肿瘤中的表达及临床意义

目的探讨环氧合酶-2(COX-2)、Ki-67和细菌L型感染在卵巢肿瘤中的表达及临床相关性。方法应用免疫组化、原位杂交和革兰染色等方法检测了120例卵巢肿瘤中的COX-2、Ki-67蛋白及mRNA的表达,以及细菌L型的检出率。并对97例卵巢乳头状癌和23例卵巢乳头状瘤主要临床资料和病理分级参数进行比较,用χ2检验进行统计学处理。结果 COX-2、Ki-67蛋白及mRNA阳性表达恶性肿瘤明显高于良性肿瘤(P<0.01)。细菌L型检出阳性率与卵巢良、恶性肿瘤差异无统计学意义(P>0.5)。COX-2、Ki-67蛋白及mRNA阳性表达以及细菌L型检出阳性率与卵巢乳头状癌的临床分期、病理分级和腹腔淋巴结有转移有显著相关性(P<0.01)。细菌L型阳性患者中COX-2、Ki-67阳性明显高于L型阴性患者中阳性表达,2组差异具有统计学意义(P<0.01)。结论 COX-2、Ki-67蛋白及mRNA在卵巢肿瘤中有不同程度的异常表达,与卵巢癌的临床分期、病理分级和浸润、转移呈正相关,L型感染极有可能成为诱发肿瘤因素一,他们可能有协同致瘤作用。研究L型感染与卵巢肿瘤的关系,具有重要的临床应用价值。     

KIAA1529 regulates RAD51 expression to confer PARP inhibitors resistance in ovarian cancer

PARP inhibitors (PARPi) are currently used as first-line therapy for advanced and recurrent ovarian cancer, but the clinical efficacy is limited by drug resistance. We aimed to investigate the role of KIAA1529 in PARPi resistance in ovarian cancer. The expression of KIAA1529 was determined in ovarian cancer cells using qRT‒PCR and western blotting. Immunohistochemistry was used to examine the expression of KIAA1529 in primary ovarian cancer and recurrent ovarian cancer tissues. The effects of KIAA1529 on PARPi resistance were evaluated by knocking down KIAA1529 expression in ovarian cancer cells and assessing cell viability by CCK8 assays, apoptosis by flow cytometry, and homologous recombination (HR) repair by immunofluorescence analysis. The interaction between KIAA1529 and RAD51 was examined by western blotting. KIAA1529 was confirmed to be expressed in all ovarian cancer cell lines, and high expression of KIAA1529 was observed in recurrent ovarian cancer tissues. Inhibiting KIAA1529 expression increased the sensitivity of ovarian cancer cells to PARPi treatment. Furthermore, KIAA1529 increased the expression of the downstream effector RAD51 via Aurora-A, and HR was restored in ovarian cancer cells. This study demonstrates that KIAA1529 regulates RAD51 expression through Aurora-A to restore HR, which confers resistance to PARPi in ovarian cancer cells. These findings could provide a novel therapeutic target to overcome PARPi resistance in ovarian cancer.