LCN5蛋白在雄性绵羊生殖器官及精子中的表达定位

doi:10.3864/j.issn.0578-1752.2022.07.015

Abstract

Abstract:

【Objective】The aim of this experiment was to investigate the expression pattern and localization of LCN5 in the testis of ram, the different segments of the epididymis and spermatozoa among them, providing clues to further explore the function of LCN5 in ram reproductive organs. 【Method】All the samples were from 6 healthy 9-month-old rams with similar weight (65.23±1.95 kg). Three rams were used to collect ejaculated sperm via artificial vagina while the others for collecting the testes, epididymis, and vas deferens as well as the regional spermatozoa within these male reproductive ducts using aseptic castration. The right testis, efferent ducts (ED), caput (E1-E2), corpus (E3-E5), cauda (E6-E7) and vas deferens (VS) samples were collected and placed in liquid nitrogen and 4% paraformaldehyde, respectively; the spermatozoa from ejaculated semen, the right testis, various segments of the epididymis and the vas deferens were separated and determined by the CASA system. Western Blot and immunohistochemistry were performed to detect the localization of LCN5 in the testis, the various segments of the epididymis, and vas deferens, respectively. Immunofluorescence was carried out to examine the dynamic localization of LCN5 in the spermatozoa from the testis, different segment of epididymis and vas deferens. 【Result】 (1) The CASA results showed that the proportion of grade A and C spermatozoa and the sperm kinematic parameters were highest, including VAP, VSL, VCL, ALH, BCF, WOB, LIN and STR from the ejaculated sperm and spermatozoa in caudal epididymis, compared with those from the other segments of male reproductive ducts. Except for that, there were the more grade A spermatozoa in VS, which showed better motility than others. However, the spermatozoa from testis were completely immotile. (2)The Western Blot results discovered that the highest expression of LCN5 was found in the E1 segment, next in segment E2 and E7, which were more than in corpus, testis and efferent ducts (P<0.05). The quantitative analysis showed the LCN5 expression levels in these tissues was ordered as E1>E2>E6>E3≈E5≈E4≈E7>VS>ED>T. (3) Immunohistochemistry found that there were slight positive signals of LCN5 in the testicular elongated spermatids, the principal and basal cells of the efferent ducts, while strong positive signals could be detected in the principal and basal cells, stereocilia of epididymal epithelium in the caput, corpus, and cauda. Granular signals of LCN5 were scattered around the sperm in the epididymal lumen. Besides, the weak LCN5 positive signals were found in the smooth muscle cells of the vas deferens. (4) Immunofluorescence results of LCN5 protein on the spermatozoa from different regions showed dynamic changes. Firstly, the local positive signals on the surface of sperm acrosome and midpiece of spermatozoa from testis and ED could be only found. With the spermatozoa transition from the testis to the epididymis, these signals began to expand and spread on the whole surface of sperm acrosome and the intensity of the signals on the sperm acrosome and midpiece reached the peak in the E1 segment. Secondly, the positive signals also existed in cytoplasmic droplets of the sperm flagellum. These signals also showed gradually loss with the removal of cytoplasmic droplets along the epidydimal ducts until E6 or E7. The expression pattern of LCN5 on the cauda and corpus on the sperm surface was similar to that of the caput. 【Conclusion】This research firstly revealed that LCN5 protein was regionally expressed in the ram reproductive system, highly expressed in the epididymal caput and gathered in the E6 segment. In the epididymal cauda, LCN5 was mainly expressed in the surface of acrosome on the spermatozoa from the caput, corpus, caudal of epididymis, as well as the cytoplasmic droplets of the sperm flagellum, which presented a dynamic distribution both on the surface of sperm and midpiece corresponding to the sperm quality and motility along the ram reproductive ducts, highlighting its potential function in sperm maturation. Taken together, LCN5 could play an essential role in spermatogenesis, maturation, storage, which provided the theoretical basis for its functional research and exploitation.

Key words: LCN5, different segments of the epididymis, sperm maturation, storage of sperm, ram

DONG FuCheng,MA ShuLi,SHI JuanJuan,ZHANG JunMei,CUI Yan,REN YouShe,ZHANG ChunXiang. Expression and Localization of LCN5 in Ram Reproductive Organs and Spermatozoa[J].Scientia Agricultura Sinica, 2022, 55(7): 1445-1457.

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References 60

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组别 Group	A percent (%)	C percent (%)	D percent (%)	VAP (μm·s^-1)	VSL (μm·s^-1)	VCL (μm·s^-1)	ALH (μm)	BCF (Hz)	WOB (%)	LIN (%)	STR (%)
ED	0.86± 0.27d	8.24± 1.94c	90.91± 5.92a	14.05± 1.18e	5.97± 0.46e	25.27± 3.98c	1.04± 0.23c	0.97± 0.36d	46.71± 9.63e	21.64± 5.52d	40.80± 6.57c
E1	0.97± 0.45d	18.14± 2.78a	79.22± 9.98b	14.19± 2.6e	7.36± 1.04de	29.27± 4.85c	1.09± 0.36c	1.57± 0.59cd	59.07± 9.03bcde	33.25± 5.23bcd	54.14± 7.63b
E2	1.52± 0.63d	11.64± 3.1abc	86.88± 12.92ab	17.64± 2.86de	9.53± 1.27de	33.79± 3.82bc	2.08± 0.70b	2.56± 0.78bcd	57.58± 7.54cde	33.68± 5.95bcd	55.74± 6.86bcd
E3	2.12± 0.44d	10.27± 1.50abc	87.60± 4.69ab	19.33± 2.26de	10.10± 2.64de	40.31± 4.48bc	1.59± 0.46bc	2.32± 0.75bcd	51.61± 9.59d	34.12± 6.13bcd	53.40± 4.88b
E4	1.87± 0.32d	18.34± 3.13a	79.78± 7.06b	18.93± 2.70de	13.19± 2.50de	30.06± 8.9c	1.68± 0.54bc	3.19± 1.25bc	56.30± 7.18de	43.49± 8.54abc	62.53± 9.59ab
E5	6.22± 1.65d	10.01± 2.62abc	83.76± 7.38ab	26.13± 4.75d	15.60± 1.85d	46.89± 3.6b	2.09± 0.29b	4.58± 2.48b	55.27± 9.40de	32.64± 5.20cd	56.41± 5.91b
E6	64.55± 9.39b	17.72± 3.47ab	14.72± 5.98d	60.55± 8.33b	46.13± 6.46b	99.62± 9.86a	3.83± 0.26a	8.48± 1.10a	62.81± 6.18abc	45.65± 5.39a	72.26± 5.42a
E7	67.13± 3.10b	12.38± 1.99abc	20.48± 5.61d	72.18± 4.97a	54.16± 6.63ab	101.8± 9.86a	3.58± 0.19a	8.40± 0.98a	69.65± 7.42ab	52.03± 6.21a	74.28± 5.42a
VS	43.41± 7.99c	13.50± 2.40 abc	43.09± 9.15c	46.27± 3.76c	29.58± 5.20c	89.42± 11.67a	3.76± 0.54a	9.80± 1.65a	51.60± 5.03d	32.52± 5.16cd	62.27± 7.05ab
ES	76.79± 4.88a	8.60± 1.5bc	14.88± 5.35d	74.24± 9.91a	55.27± 7.38a	100.6± 15.37a	3.77± 0.35a	8.83± 1.06a	73.25± 6.07a	54.52± 6.44a	74.29± 4.18a

Expression and Localization of LCN5 in Ram Reproductive Organs and Spermatozoa

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